Japan Science and Technology Corporation

Takenaka Corporation

Japan Science and Technology Agency

Masahito Yoshizawa

Kenji Nakai

Itsuro Tamura

Satoshi Fujita

Keita Yamazaki

Kohei Kawazoe

Tomoaki Ueda

Koichiro Kobayashi

Masaharu Kawachi

Daisuke Oyama

Nobuyoshi Sato

Takayuki Simizu

In a SQUID magnetometer, high resolution, a high slew rate, and a high dynamic range are achieved without using expensive circuit components having a large number of processing bits and enabling a high speed processing operation. A digital FLL circuit using a double counter system is provided. This circuit utilizes two or more counters, for example, a change range counter in a digital FLL for carrying out a processing operation at a high speed and a reproducing counter in a control/measuring computer. In addition, in the present invention, hysteresis characteristics having a 1&#x3a6;positive margin is used. That is, a change of a state of a magnetic flux is counted by means of a counter. At the time of this change, control is made so as to track a different channel between cases in which a magnetic flux increases and decreases, thereby stabilizing the control.

Magnetic flux measuring apparatus by hysteresis characteristic type digital FLL using counter system for squid

A magnetic field distribution measurement device () provides a non-contact magnetic measurement on a subject's chest at a plurality of coordinates and forms therefrom time-series magnetic field distribution data. A first arithmetic device () in response generates image data representing a three-dimensional, intramyocardial current density distribution. A second arithmetic device () receives a plurality of tomographic image data separately obtained by a tomographic diagnosis apparatus and processes the data to generate three-dimensional, anatomical image data. A display device () receives these data and displays on an anatomical image an image representing an intramyocardial current density. Thus in a ventricle a lesioned or viable part of myocardium can be readily identified in location, size, geometry and level. Furthermore, the anatomical image may be replaced with an image representing a normal stimulation propagation circuit and serving as a template.

Liable cardiac muscle diagnosing apparatus and liable cardiac muscle analyzing method by magnetic field measurements

A magnetic field distribution measurement device () provides a non-contact magnetic field measurement on a subject's chest at a plurality of coordinates and forms therefrom time-series magnetic field distribution data. A first arithmetic device () in response generates image data representing a three-dimensional, intramyocardial current density distribution. A second arithmetic device () receives a plurality of tomographic image data separately obtained by a tomographic diagnosis apparatus and processes the data to generate three-dimensional, anatomical image data. A display device () receives these data and displays on an anatomical image an image representing an intramyocardial current density. This can facilitate identifying an anatomical, positional relationship of an abnormal, electrical reentry circuit caused in heart muscle. Furthermore, the anatomical image may be replaced with an image representing a normal stimulation propagation circuit and serving as a template.

Cardiac magnetic field diagnozer for atrial flutter and atrial fibrillation and method for identifying electric turning path of atrial flutter and atrial fibrillation

A magnetic field distribution measurement device () provides a non-contact magnetic measurement on a subject's chest at a plurality of coordinates and forms therefrom time-series magnetic field distribution data. A first arithmetic device () in response generates image data representing an intramyocardial excitation conduction rate. A second arithmetic device () receives a plurality of tomographic image data separately obtained by a tomographic diagnosis apparatus and processes the data to generate three-dimensional, anatomical image data. A display device () receives these data and displays on an anatomical image an image representing an intramyocardial excitation current. This can facilitate identifying an anatomical, positional relationship of a ventricular late potential caused in heart muscle. Furthermore, the anatomical image may be replaced with an image representing a normal stimulation conduction path and serving as a template.

Cardiac magnetic field diagnosing apparatus by late ventricular potential and method of locating intramyocardial excitement uneven propagation portion

The method of manufacturing a superconducting quantum interference type magnetic fluxmeter including forming an input coil and a pickup coil integrated with the input coil by electrophoretically depositing high-temperature superconducting fine particles on a surface of the first cylindrical ceramic substrate, and sintering the fine particles, forming a high-temperature superconductor magnetic shield tube by electrophoretically depositing high-temperature superconducting fine particles on an entire surface of the second cylindrical ceramic substrate, and sintering the fine particles, magnetically coupling the input coil and the high-temperature superconducting quantum interference type element by placing the pickup coil such that a distal end portion thereof is inserted within a lower end portion of the magnetic shield tube and inserting the high-temperature superconducting quantum interference type element from an upper end portion of the magnetic shield tube.

Method of manufacturing superconducting quantum interference type magnetic fluxmeter

Growing community of inventors

Morioka, Japan

Masahito Yoshizawa