Biomagnetic field measuring method and apparatus

A biomagnetic field measuring method comprising:

• a first step of measuring temporal changes of components of a biomagnetic field generated from a living body by using a-plurality of fluxmeters disposed externally of said living body and each including a superconducting quantum interference device (SQUID), said magnetic field components being in first and second directions which are parallel to the surface of said living body;
• a second step of determining a temporal change of a value proportional to a root of square sum of said magnetic field components in first and second directions;
• a third step of integrating said temporal change of the value obtained in said second step over a predetermined interval to determine an integral value;
• and
• a fourth step of displaying said integral value obtained in said third step.

A biomagnetic field measuring method comprising:

• a first step of measuring a component of a biomagnetic field generated from a living body by using a plurality of fluxmeters disposed externally of said living body and each including a superconducting quantum interference device (SQUID), said magnetic field component being in a first direction which is vertical to the surface of said living body;
• a second step of determining a value proportional to a root of square sum of differential value of said first-direction magnetic field component in second and third directions which cross said first direction;
• and
• a third step of displaying said value obtained in said second step.

A biomagnetic field measuring apparatus comprising:

• a plurality of fluxmeters disposed externally of a living body and each 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 component of the biomagnetic field in a first direction which is vertical to the surface of said living body;
• operation processing means for performing computation for determining a temporal change of a value proportional to a root of square sum of change rates of said first-direction magnetic field component in second and third directions which cross said first direction and computation for integrating said temporal change of the value over a predetermined interval to determine an integral value;
• and
• display means for displaying said integral value.

A biomagnetic field measuring apparatus comprising:

• a plurality of fluxmeters disposed externally of a living body and each 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 temporal changes of components of the biomagnetic field in first and second directions which are parallel to the surface of said living body;
• operation processing means for performing computation for determining a temporal change of a value proportional to a root of square sum of said first-and second-direction magnetic field components and computation for integrating said temporal change of the value over a predetermined interval to determine an integral value;
• and
• display means for displaying said integral value.

A biomagnetic field measuring apparatus comprising:

• a plurality of fluxmeters disposed externally of a living body and each 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 vertical to the surface of said living body, where a plane parallel to the living body surface corresponds to x, y plane of the Cartesian coordinate system and a direction vertical to said living body surface corresponds to z axis of the Cartesian coordinate system;
• operation processing means for determining a value proportional to a root of square sum of differential value in x and y directions of said magnetic field component;
• and
• display means for displaying an isomagnetic field magnitude curve for connecting points at which the above values are equal to each other.

A biomagnetic field measuring apparatus comprising:

• a plurality of fluxmeters disposed externally of a living body and each 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 component of the biomagnetic field in a first direction which is vertical 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 change rates of said first-direction magnetic field component in second and third directions which cross said first direction;
• and
• display means for displaying said value.

A biomagnetic field measuring apparatus comprising:

• a plurality of fluxmeters disposed externally of a living body and each 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 component of the biomagnetic field in a first direction which is vertical to the surface of said living body;
• operation processing means for performing computation for determining a root of square sum of differential value of said first-direction magnetic field component in second and third directions which cross said first direction;
• and
• display means for displaying said root value.

A biomagnetic field measuring apparatus comprising:

• a plurality of fluxmeters disposed externally of a living body and each 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 vertical to the surface of said living body;
• operation processing means for performing computation for determining a root of square sum of differential value of said first-direction magnetic field component in second and third directions which cross said first direction;
• and
• display means for displaying a value proportional to said root and imaging and displaying magnitude distribution of the biomagnetic field within a time zone during which the ventricle of the heart of said living body depolarizes and within a time zone during which repolarization of said ventricle proceeds.

A biomagnetic field measuring method comprising:

• a first step of measuring a component of a biomagnetic field generated from a living body by using a plurality of fluxmeters each including a superconducting quantum interference device (SQUID), said magnetic field component being in a first direction which is vertical to the surface of said living body;
• a second step of determining a 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-direction magnetic field component;
• a third step of determining a component of the magnetic field in a third direction which is orthogonal to said first and second directions from a change rate in said third direction of said first-direction magnetic field component;
• and
• a fourth step of determining a value proportional to a root of square sum of said magnetic field components in said second and third directions.

A biomagnetic field measuring method comprising:

• a first step of 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 and each including a superconducting quantum interference device (SQUID), said normal component being vertical to the surface of said living body;
• a second step of presuming two tangential components from said normal component and determining a root of square sum of said two tangential components;
• a third step of integrating a value proportional to said root of square sum to determine an integral value;
• and a fourth step of displaying positional distribution of the integral values.

A biomagnetic field measuring apparatus comprising:

• a plurality of fluxmeters disposed externally of a living body and each 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 z-direction component of said biomagnetic field, where a plane parallel to the surface of said living body corresponds to x, y plane of the Cartesian coordinate system and a direction vertical to the living body surface corresponds to z axis of the Cartesian coordinate system;
• operation processing means for determining a value proportional to a root of
• Bxy={(∂Bz(x, y)/∂x)2+(∂Br(x, y)/∂y)2}
• from said z-direction component;
• and
• display means for displaying an isomagnetic field magnitude curve for connecting points at which the above values are equal to each other.

A biomagnetic field measuring apparatus comprising:

• a plurality of fluxmeters disposed externally of a living body and each 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 z-direction component of said biomagnetic field, where a plane parallel to the surface of said living body corresponds to x, y plane of the Cartesian coordinate system and a direction vertical to the living body surface corresponds to z axis of the Cartesian coordinate system;
• operation processing means for determining a value proportional to a root of
• Bxy={(∂Bz(x, y)/∂x)2+(∂Bz(x, y)/∂y)2}
• from said z-direction component;
• and
• display means for displaying said value proportional to the root.

A biomagnetic field measuring apparatus comprising:

• a plurality of fluxmeters disposed externally of a living body and each 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 component of said biomagnetic field in a first direction which is vertical to the surface of said living body;
• operation processing means for determining components of said biomagnetic field in second and third directions which cross said first direction from said first-direction magnetic field component;
• and
• display means for displaying distribution of said biomagnetic field within a time zone during which a QRS wave of magnetocardiogram of said living body appears and within a time zone during which a T wave of said magnetocardiogram appears.