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Claims  |
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What is claimed is:
1. A biomagnetic field measuring method comprising:
(1) measuring a temporal change of a first magnetic field component of a
biomagnetic field generated from a living body by using a plurality of
fluxmeters disposed externally of said living body, each fluxmeter
including a superconducting quantum interference device (SQUID), said
first magnetic field component being in a first direction which is
perpendicular to the surface of said living body;
(2) determining a magnetic wave form expressing a temporal change of a
value proportional to a root of square sum of a differential value of said
first magnetic field component in a second direction which crosses said
first direction and a differential value of said first magnetic field
component in a third direction which crosses said first direction and said
second direction;
(3) integrating said magnetic wave form within a predetermined time
interval to determine an integral value; and
(4) displaying said integral value.
2. A biomagnetic field measuring method comprising:
(1) measuring a temporal change of first and second magnetic field
components of a biomagnetic field generated from a living body by using a
plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID),
said first and second magnetic field components being in first and second
directions which are parallel to the surface of said living body and which
cross each other;
(2) determining a magnetic wave form expressing a temporal change of a
value proportional to a root of square sum of said first magnetic field
component and said second magnetic field component;
(3) integrating said magnetic wave form within a predetermined time
interval to determine an integral value; and
(4) displaying said integral value.
3. A biomagnetic field measuring method comprising:
(1) measuring a temporal change of a first magnetic field component of a
biomagnetic field generated from a living body by using a plurality of
fluxmeters disposed externally of said living body, each fluxmeter
including a superconducting quantum interface device (SQUID), said first
magnetic field component being in a first direction which is perpendicular
to the surface of said living body;
(2) determining a magnetic wave form expressing a temporal change of a
value proportional to a root of square sum of a differential value of said
first magnetic field component in a second direction which crosses said
first direction and a differential value of said first magnetic field
component in a third direction which crosses said first direction and said
second direction;
(3) integrating said magnetic wave form within a predetermined time
interval to determine an integral value, and determining an isointegral
map obtained by connecting points at which said integral values are equal
to each other; and
(4) displaying said isointegral map.
4. A biomagnetic field measuring method comprising:
(1) measuring a temporal change of a first magnetic field component of a
biomagnetic field generated from a living body by using a plurality of
fluxmeters disposed externally of said living body, each fluxmeter
including a superconducting quantum interface device (SQUID), said first
magnetic field component being in a first direction which is perpendicular
to the surface of said living body;
(2) determining a magnetic wave form expressing a temporal change of a
value proportional to a root of square sum of a differential value of said
first magnetic field component in a second direction which crosses said
first direction and a differential value of said first magnetic field
component in a third direction which crosses said first direction and said
second direction;
(3) integrating said magnetic wave form within a plurality of predetermined
time intervals to determine a plurality of integral values, computing a
combined value of any of a ratio, a sum or a difference between two of
said integral values, and determining an isointegral map obtained by
connecting points at which said combined values are equal to each other;
and
(4) displaying said isointegral map.
5. A biomagnetic field measuring method comprising:
(1) measuring a first magnetic field component of a biomagnetic field
generated from a living body by using a plurality of fluxmeters disposed
externally of said living body, each fluxmeter including a superconducting
quantum interference device (SQUID), said first magnetic field component
being in a first direction which is perpendicular to the surface of said
living body;
(2) determining a value proportional to a root of square sum of a
differential value of said first magnetic field component in a second
direction which crosses said first direction and a differential value of
said first magnetic field component in a third direction which crosses
said first direction and said second direction, and determining an
isomagnetic field map obtained by connecting points at which said values
proportional to said root are equal to each other; and
(3) displaying said isomagnetic field map.
6. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of a living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a temporal change of a
magnetic field component of the biomagnetic field in a first direction
which is perpendicular to the surface of said living body;
operation processing means for performing computation for determining a
magnetic wave form expressing a temporal change of a value proportional to
a root of square sum of a differential value of said magnetic field
component in a second direction which crosses said first direction and a
differential value of said magnetic field component in a third which
crosses said first direction and said second direction, and computation
for integrating said magnetic wave form within a predetermined time
interval to determine an integral value; and
display means for displaying said integral value.
7. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from a living body, said
plurality of fluxmeters being operative to detect temporal changes of
components of the biomagnetic field in first and second directions which
are parallel to the surface of said living body and which cross each
other;
operation processing means for performing computation for determining a
magnetic wave form expressing a temporal change of a value proportional to
a root of square sum of said first magnetic field component and said
second magnetic field component, and computation for integrating said
magnetic wave form within a predetermined time interval to determine an
integral value; and
display means for displaying said integral value.
8. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a temporal change of a
magnetic field component of the biomagnetic field in a first direction
which is perpendicular to the surface of said living body;
operation processing means for performing computation for determining a
magnetic wave form expressing a temporal change of a value proportional to
a root of square sum of a differential value of said magnetic field
component in a second direction which crosses said first direction and a
differential value of said magnetic field component in a third direction
which crosses said first direction and said second direction, computation
for integrating said magnetic wave form within a predetermined time
interval to determine an integral value, and computation for determining
an isointegral map obtained by connecting points at which said integral
values are equal to each other; and
display means for displaying said isointegral map.
9. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a temporal change of a
magnetic field component of the biomagnetic field in a first direction
which is perpendicular to the surface of said living body;
operation processing means for performing computation for determining a
magnetic wave form expressing a temporal change of a value proportional to
a root of square sum of a differential value of said magnetic field
component in a second direction which crosses said first direction and a
differential value of said magnetic field component in a third direction
which crosses said first direction and said second direction, computation
for integrating said magnetic wave form within a plurality of
predetermined time intervals to determine integral values, computation for
obtaining a combined value of any of a ratio, a sum or a difference
between two of said integral values, and computation for determining an
isointegral map obtained by connecting points at which said combined
values are equal to each other; and
display means for displaying said isointegral map.
10. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a temporal change of a
magnetic field component of the biomagnetic field in a first direction
which is perpendicular to the surface of said living body;
operation processing means for performing computation for determining a
magnetic wave form expressing a temporal change of a value proportional to
a root of square sum of a differential value of said magnetic field
component in a second direction which crosses said first direction and a
differential value of said magnetic field component in a third direction
which crosses said first direction and said second direction, and
computation for integrating said magnetic wave form within a predetermined
time interval to determine an integral value; and
display means for displaying said integral value.
11. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a magnetic field
component perpendicular to the surface of said living body, wherein a
plane parallel to the living body surface corresponds to the x, y plane of
a Cartesian coordinate system and a direction vertical to said living body
surface corresponds to the z axis of the Cartesian coordinate system;
operation processing means for determining a value proportional to a root
of square sum of a differential value in the x direction of said magnetic
field component and a differential value in the y direction of said
magnetic field component, and for determining an isomagnetic field map
obtained by connecting points at which said values proportional to said
root are equal to each other; and
displaying said isomagnetic field map.
12. A biomagnetic field measuring apparatus according to claim 11, wherein
said operation processing means uses, in computation for solving an
inverse problem for estimating a position and a magnitude of a magnetic
field source within said living body, the number of peaks and position
data of said peaks in said isomagnetic field map as initial values of the
number of said magnetic field sources and positions of said magnetic field
sources.
13. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a magnetic field
component of the biomagnetic field in a first direction which is
perpendicular to the surface of said living body;
operation processing means for performing computation for determining a
value proportional to a root of square sum of a differential value of said
magnetic field component in a second direction which crosses said first
direction and a differential value of said magnetic field component in a
third direction which crosses said first direction and said second
direction; and
display means for displaying said value proportional to said root.
14. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a magnetic field
component of the biomagnetic field in a first direction which is
perpendicular to the surface of said living body;
operation processing means for performing computation for determining a
root of square sum of a differential value of said magnetic field
component in a second direction which crosses said first direction and a
differential value of said magnetic field component in a third direction
which crosses said first direction and said second direction; and
display means for displaying said root value.
15. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a magnetic field
component of the biomagnetic field in a first direction which is
perpendicular to the surface of said living body;
operation processing means for performing computation for determining a
value proportional to a root of square sum of a differential value of said
magnetic field component in a second direction which crosses said first
direction and a differential value of said magnetic field component in a
third direction which crosses said first direction and said second
direction; and
display means for displaying said value proportional to said root and
displaying a first magnitude distribution of the biomagnetic field within
a time interval during which the ventricle of the heart of said living
body depolarizes and a second magnitude distribution of the biomagnetic
field within a time interval during which repolarization of said ventricle
proceeds.
16. A biomagnetic field measuring method comprising:
(1) measuring a first magnetic field component of a biomagnetic field
generated from a living body using a plurality of fluxmetersU, each
fluxmeter including a superconducting quantum interference device (SQUID),
said first magnetic field component being in a first direction which is
perpendicular to the surface of said living body;
(2) determining a second magnetic field component of the biomagnetic field
in a second direction which is orthogonal to said first direction from a
differential value in said second direction of said first magnetic field
component, and determining a third magnetic field component of the
biomagnetic field in a third direction which is orthogonal to said first
and second directions from a differential value in said third direction of
said first magnetic field component;
(3) determining a value proportional to a root square sum of said second
magnetic field component and third magnetic field component, and
determining an isomagnetic field map obtained by connecting points at
which said values proportional to said root are equal to each other; and
(4) displaying said isomagnetic field map.
17. A biomagnetic field measuring method comprising:
(1) measuring a first magnetic field component of a biomagnetic field
generated from a living body using a plurality of fluxmeters each
including a superconducting quantum interference device (SQUID), said
first magnetic field component being in a first direction which is
perpendicular to the surface of said living body;
(2) determining a second magnetic field component of the biomagnetic field
in a second direction which is orthogonal to said first direction from a
differential value in said second direction of said first magnetic field
component, and determining a third magnetic field component of the
biomagnetic field in a third direction which is orthogonal to said first
and second directions from a differential value in said third direction of
said first magnetic field component;
(3) determining a value proportional to a root of square sum of said second
magnetic field component and third magnetic field component;
(4) integrating a magnetic wave form expressing a temporal change of said
value in step (3) within a predetermined time interval to determine an
integral value, and determining an isointegral map obtained by connecting
points at which said integral values are equal to each other; and
(5) displaying said isointegral map.
18. A biomagnetic field measuring method comprising:
(1) measuring a normal component of a biomagnetic field generated from a
living body by using a plurality of fluxmeters disposed externally of said
living body, each fluxmeter including a superconducting quantum
interference device (SQUID), said normal component being perpendicular to
the surface of said living body;
(2) estimating first and second tangential components of the biomagnetic
field from said normal component and determining a root of square sum of
said first and second tangential components;
(3) integrating a magnetic wave form expressing a temporal change of a
value proportional to said root of square sum within a predetermined time
interval to determine an integral value, and determining an isointegral
map obtained by connecting points at which said integral values are equal
to each other; and
(4) displaying said isointegral map.
19. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a magnetic field
component (B.sub.z (x, y, t)) in a z axis direction of said biomagnetic
field, wherein a plane parallel to the surface of said living body
corresponds to the x, y plane of a Cartesian coordinate system and a
direction perpendicular to the living body surface corresponds to the z
axis of the Cartesian coordinate system;
operation processing means for determining a value proportional to a root
of S(x, y, t)={.delta.B.sub.z (x, y, t)/.delta.x).sup.2 +(.delta.B.sub.z
(x, y, t)/.delta.y).sup.2 } from said magnetic field component (B.sub.z
(x, y, t)) in the z axis direction, and for determining an isomagnetic
field map obtained by connecting points at which said values proportional
to said root are equal to each other; and
display means for displaying said isomagnetic field map.
20. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a magnetic field
component (B.sub.z (x, y, t)) in a z axis direction of said biomagnetic
field, wherein a plane parallel to the surface of said living body
corresponds to the x, y plane of a Cartesian coordinate system and a
direction perpendicular to the living body surface corresponds to the z
axis of the Cartesian coordinate system;
operation processing means for determining a value proportional to a root
of
S(x, y, t)={.delta.B.sub.z (x, y, t)/.delta.x).sup.2 +(.delta.B.sub.z (x,
y, t)/.delta.y).sup.2 }
from said magnetic field component (B.sub.z (x, y, t)) in the z axis
direction; and
display means for displaying said value proportional to the root.
21. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of a living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a magnetic field
component (B.sub.z (x, y, t)) in a z axis direction of said biomagnetic
field, wherein a plane parallel to the surface of said living body
corresponds to the x, y plane of a Cartesian coordinate system and a
direction perpendicular to the living body surface corresponds to the z
axis of the Cartesian coordinate system;
operation processing means for performing computation for determining a
value proportional to a root of
S(x, y, t)={.delta.B.sub.z (x, y, t)/.delta.x).sup.2 +(.delta.B.sub.z (x,
y, t)/.delta.y).sup.2 }
from said magnetic field component (B.sub.z (x, y, t)) in the z axis
direction; and
display means for displaying said value proportional to the root and
displaying a first magnitude distribution of the biomagnetic field within
a time interval during which the ventricle of the heart of said living
body depolarizes and a second magnitude distribution of the biomagnetic
field within a time interval during which repolarization of said ventricle
proceeds.
22. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a normal component of
the biomagnetic field perpendicular to the surface of said living body;
operation processing means for performing computation for determining a
magnitude distribution of said biomagnetic field from two tangential
components of said biomagnetic field, said two tangential components being
estimated from said normal component measured by said plurality of
fluxmeters; and
display means for displaying said magnitude distribution of said
biomagnetic field.
23. A biomagnetic field measuring apparatus according to claim 22, wherein
said display means displays a magnitude distribution of said biomagnetic
field generated from the heart of said living body.
24. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a first magnetic field
component of said biomagnetic field in a first direction which is
perpendicular to the surface of said living body;
operation processing means for determining magnetic field components of
said biomagnetic field in second and third directions which cross said
first direction from said first magnitude field component, and for
determining a first magnetic distribution of said biomagnetic field within
a time interval during which a QRS wave of a magneticardiogram of said
living body appears and a second magnitude distribution of said
biomagnetic field within a time interval during which a T wave of a
magnetocardiogram appears; and
display means for displaying said first magnitude distribution and said
second magnitude distribution.
25. A biomagnetic field measuring apparatus according to claim 24, wherein
said display means displays a magnitude distribution of the difference
between said first magnitude distribution and said second magnitude
distribution.
26. A biomagnetic field measuring method comprising:
(1) measuring a temporal change of first and second magnetic field
components of a biomagnetic field generated from a living body by using a
plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID),
said first and second magnetic field components being in first and second
directions which are parallel to the surface of said living body and which
cross each other;
(2) determining a magnetic wave form expressing a temporal change of a
value proportional to a root of square sum of said first magnetic field
component and said second magnetic field component;
(3) integrating said magnetic wave form within a predetermined time
interval to determine a plurality of integral values, computing a combined
value of any of a ratio, a sum or a difference between two of said
integral values, and determining an isointegral map obtained by connecting
points at which said computed combined values are equal to each other; and
(4) displaying said isointegral map.
27. A biomagnetic field measuring method comprising:
(1) measuring a normal component of a biomagnetic field generated from a
living body by using a plurality of fluxmeters disposed externally of said
living body, each fluxmeter including a superconducting quantum
interference device (SQUID), said normal component being perpendicular to
the surface of said living body;
(2) estimating first and second tangential components of the biomagnetic
field from said normal component, and determining a root of square sum of
said first and second tangential components;
(3) determining a value proportional to said root of square sum, and
determining an isomagnetic field map obtained by connecting points at
which said values proportional to said root are equal to each other; and
(4) displaying said isomagnetic field map.
28. A biomagnetic field measuring method comprising:
(1) measuring a magnetic field component (B.sub.z, (x, y, t)) in a z axis
direction of a biomagnetic field generated from a living body by using a
plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID),
wherein a plane parallel to the surface of said living body corresponds to
the x, y plane of a Cartesian coordinate system and a direction
perpendicular to the surface of said living body corresponds to the z axis
of the Cartesian coordinate system;
(2) determining a value proportional to a root of
S(x, y, t)={{.delta.B.sub.z (x, y, t)/.delta.x}.sup.2 +{.delta.B.sub.z (x,
y, t)/.delta.y}.sup.2 }
from said magnetic field component (B.sub.z (x, y, t)) in the z axis
direction, and determining an isomagnetic field map obtained by connecting
points at which said values proportional to said root are equal to each
other; and
(3) displaying said isomagnetic field map.
29. A biomagnetic field measuring method comprising:
(1) measuring a magnetic field component (B.sub.z (x, y, t)) in a z axis
direction of a biomagnetic field generated from a living body by using a
plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID),
wherein a plane parallel to the surface of said living body corresponds to
the x, y plane of a Cartesian coordinate system and a direction
perpendicular to the surface of said living body corresponds to the z axis
of the Cartesian coordinate system;
(2) determining a magnetic wave form expressing a temporal change of a
value proportional to a root of
S(x, y, t)=({.delta.B.sub.z (x, y, t)/.delta.x}.sup.2 +{.delta.B.sub.z (x,
y, t)}/.delta.y}}
from said magnetic field component (B.sub.z (x, y, t)) in the z axis
direction, and integrating said magnetic wave form within a predetermined
time interval to determine an integral value;
(3) determining an isointegral map obtained by connecting points at which
said integral values are equal to each other; and
(4) displaying said isointegral map.
30. A biomagnetic field measuring method comprising:
(1) measuring a biomagnetic field generated from a living body by using a
plurality of fluxmeters disposed externally of said living body, wherein
each of said fluxmeters includes a superconducting quantum interference
device (SQUID) and detects temporal changes of components of the
biomagnetic field in first and second directions which are in parallel to
the surface of said living body and which cross each other;
(2) performing computation for determining a magnetic wave form expressing
a temporal change of a value proportional to a root of square sum of said
first magnetic field component and said second magnetic field component,
computation for integrating said magnetic wave form within a plurality of
predetermined time intervals to determine integral values, computation for
obtaining a combined value of any of a ratio, a sum or a difference
between two of said integral values, and computation for determining an
isointegral map obtained by connecting points at which said combined
values are equal to each other; and
(3) displaying said integral value.
31. A biomagnetic field measuring method comprising:
(1) measuring a magnetic field component (B.sub.z (x, y, t)) in a z axis
direction of a biomagnetic field generated from a living body by using a
plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID),
wherein a plane parallel to the surface of said living body corresponds to
the x, y plane of a Cartesian coordinate system and a direction
perpendicular to the surface of said living body corresponds to the z axis
of the Cartesian coordinate system;
(2) determining a magnetic field component (B.sub.x (x, y, t)) in the x
axis direction from said magnetic field component (B.sub.z (x, y, t)) in
the z axis direction on the assumption that said magnetic field component
(B.sub.x (x, y, t)) in the x axis direction is proportional to
.delta.B.sub.z (x, y, t)/.delta.x,
and determining a magnetic field component (B.sub.y (x, y, t)) in the y
axis direction from said magnetic field component (B.sub.z (x, y, t)) in
the z axis direction on the assumption that said magnetic field component
(B.sub.y (x, y, t)) in the y axis direction is proportional to
.delta.B.sub.z (x, y, t)/.delta.y; and
(3) determining a magnetic wave form expressing a temporal change of a
value proportional to a root of
S(x, y, t)={{.delta.B.sub.z (x, y, y)/.delta.x}.sup.2 +{.delta.B.sub.z (x,
y, t)/.delta.y}.sup.2 }
from said magnetic field component (B.sub.z (x, y, t)) in the z axis
direction.
32. A biomagnetic field measuring method according to claim 31, further
comprising the steps:
(4) integrating said magnetic wave form within a predetermined time
interval to determine an integral value;
(5) determining an isointegral map obtained by connecting points at which
said integral values are equal to each other; and
(6) displaying said isointegral map.
33. A biomagnetic field measuring method according to claim 31, further
comprising the steps:
(4) determining an isomagnetic field map obtained by connecting points at
which said values proportional to said root are equal to each other; and
(5) displaying said isomagnetic field map.
34. A biomagnetic field measuring method comprising:
(1) measuring a magnetic field component (B.sub.z (x, y, t)) in the z axis
direction of a biomagnetic field generated from a living body by using a
plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID),
wherein a plane parallel to the surface of said living body corresponds to
the x, y plane of a Cartesian coordinate system and a direction
perpendicular to the surface of said living body corresponds to z axis of
the Cartesian coordinate system; and
(2) determining a magnetic field component (B.sub.x (x, y, t)) in the x
axis direction from said magnetic field component (B.sub.z (x, y, t)) in
the z axis direction on the assumption that said magnetic field component
(B.sub.x (x, y, t)) in the x axis direction is proportional to
.delta.B.sub.z (x, y, t)/.delta.x,
and determining a magnetic field component (B.sub.y (x, y, t)) in the y
axis direction from said magnetic field component (B.sub.z (x, y, t)) in
the z axis direction on the assumption that said magnetic field component
(B.sub.y (x, y, t)) in the y axis direction is proportional to
.delta.B.sub.z (x, y, t)/.delta.y.
35. A biomagnetic field measuring method according to claim 34, further
comprising the steps:
(3) determining a magnetic wave form expressing a temporal change of a
value proportional to a root of
S(x, y, t)={{.delta.B.sub.z (x, y, t)/.delta.x}.sup.2 +{.delta.B.sub.z (x,
y, t)/.delta.y}.sup.2 }
from said magnetic field component (B.sub.z (x, y, t)) in the z axis
direction;
(4) integrating said magnetic wave form within a predetermined time
interval to determine an integral value;
(5) determining an isointegral map obtained by connecting points at which
said integral values are equal to each other; and
(6) displaying said isointegral map.
36. A biomagnetic field measuring method according to claim 34, further
comprising the steps:
(3) determining a magnetic wave form expressing a temporal change of a
value proportional to a root of
S(x, y, t)={{.delta.B.sub.z (x, y, t)/.delta.x}.sup.2 +{.delta.B.sub.z (x,
y, t)/.delta.y}.sup.2 }
from said magnetic field component (B.sub.z (x, y, t)) in the z axis
direction;
(4) determining an isomagnetic field map obtained by connecting points at
which said values proportional to said root are equal to each other; and
(5) displaying said isomagnetic field map.
37. A biomagnetic field measuring method comprising:
(1) measuring a magnetic field component (B.sub.z (x, y, t)) in the z axis
direction of a biomagnetic field generated from a living body by using a
plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID),
wherein a plane parallel to the surface of said living body corresponds to
the x, y plane of a Cartesian coordinate system and a direction
perpendicular to the surface of said living body corresponds to the z axis
of the Cartesian coordinate system; and
(2) estimating a magnetic field component (B.sub.x (x, y, t)) in the x axis
direction and a magnetic field component (B.sub.y (x, y, t)) in the y axis
direction based on said magnetic field component (B.sub.z (x, y, t)) in
the z axis direction.
38. A biomagnetic field measuring method comprising:
(1) measuring a normal component of a biomagnetic field generated from a
living body by using a plurality of fluxmeters disposed externally of said
living body, each fluxmeter including a superconducting quantum
interference device (SQUID), said normal component being perpendicular to
the surface of said living body; and
(2) estimating first and second tangential components of the biomagnetic
field from said normal component and determining a root of square sum of
said first and second tangential components.
39. A biomagnetic field measuring method comprising:
(1) measuring a magnetic field component (B.sub.x (x, y, t)) in the x axis
direction and a magnetic field component (B.sub.y (x, y, t)) in the y axis
direction of a biomagnetic field generated from a living body by using a
plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID),
wherein a plane parallel to the surface of said living body corresponds to
the x, y plane of a Cartesian coordinate system and a direction vertical
to the surface of said living body corresponds to the z axis of the
Cartesian coordinate system;
(2) determining a magnetic wave form expressing a temporal change of a
value proportional to a root of
B.sub.xy (x, y, t)={B.sub.x (x, y, t)}.sup.2 +{B.sub.y (x, y, t)}.sup.2
from said magnetic field components (B.sub.x (x, y, t), B.sub.y (x, y, t))
in the x and y axis directions, and integrating said magnetic wave form
within a predetermined time interval to determine an integral value;
(3) determining an isointegral map obtained by connecting points at which
said integral values are equal to each other; and
(4) displaying said isointegral map.
40. A biomagnetic field measuring apparatus comprising:
a plurality of fluxmeters disposed externally of said living body, each
fluxmeter including a superconducting quantum interference device (SQUID)
for detecting a biomagnetic field generated from said living body, said
plurality of fluxmeters being operative to detect a magnetic field
component of the biomagnetic field in a first direction which is
perpendicular to the surface of said living body;
operation processing means for performing computation for determining a
magnetic wave form expressing a temporal change of a value proportional to
a root of square sum of a differential value of said magnetic field
component in a second direction which crosses said first direction and a
differential value of said magnetic field component in a third direction
which crosses said first direction and said second direction, computation
for integrating said magnetic wave form within a time interval during
which the ventricle of the heart of said living body depolarizes to
determine a first integral value, computation for integrating said
magnetic wave form within a time interval during which the repolarization
of said ventricle proceeds to determine a second integral value,
computation for determining a first isointegral map obtained by connecting
points at which said first integral values are equal to each other, and
computation for determining a second isointegral map obtained by
connecting points at which said second integral values are equal to each
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