Biomagnetic measurement system and biomagnetic measurement method

Patent metadata

Field	Value
Publication number	US-11389076-B2
Application number	US-202016806021-A
Country	US
Kind code	B2
Filing date	Mar 2, 2020
Priority date	Mar 8, 2019
Publication date	Jul 19, 2022
Grant date	Jul 19, 2022

Abstract

A biomagnetic measurement system includes a magnetism measurement apparatus configured to measure a magnetism of a target; and an electrical stimulation apparatus configured to apply a stimulation current to the target. The magnetism measurement apparatus includes a confirming unit configured to confirm a magnitude of an artifact caused by the stimulation current. The electrical stimulation apparatus is configured to output a compensation current for reducing the artifact after the stimulation current is output, based on information from the confirming unit.

First claim

What is claimed is:

1. A biomagnetic measurement system comprising:
a magnetism measurement apparatus configured to measure a magnetism of a target; and
an electrical stimulation apparatus configured to apply a stimulation current to the target, wherein
the magnetism measurement apparatus includes:
a processor configured to confirm a magnitude of an artifact caused by the stimulation current, wherein

the electrical stimulation apparatus is configured to output a compensation current for reducing the artifact after the stimulation current is output, based on information from the confirming unit,
wherein an elapsed time from a time to start applying the stimulation current to a time to stop outputting the compensation current is equal to or less than a first predetermined time, and
wherein the first predetermined time is 1.0 msec.

2. The biomagnetic measurement system according to claim 1 , wherein the electrical stimulation apparatus is configured to automatically adjust the compensation current based on the information from the processor.

3. The biomagnetic measurement system according to claim 1 , wherein the magnetism measurement apparatus further includes:
a magnetic sensor,
wherein the processor is further configured to
acquire, from the magnetic sensor, magnetic signals generated when the stimulation current is applied, and
confirm the magnitude of the artifact included in the magnetic signals.

4. The biomagnetic measurement system according to claim wherein the magnetic signals are summed and averaged.

5. The biomagnetic measurement system according to claim 1 , wherein the stimulation current and the compensation current are pulse signals having opposite phases to each other.

6. The biomagnetic measurement system according to claim 1 , wherein neither the stimulation current nor the compensation current is applied for a second predetermined time within the elapsed time.

7. A biomagnetic measurement method comprising
applying a stimulation current to a target;
confirming a magnitude of an artifact caused by the stimulation current; and
outputting a compensation current for reducing the artifact after the stimulation current is output, based on information obtained at the confirming,
wherein an elapsed time from a time to start applying the stimulation current to a time to stop outputting the compensation current is equal to or less than a first predetermined time, and
wherein the first predetermined time is 1.0 msec.

Assignees

• Maeda Ryoh
• Miyano Yuki
• Ricoh Co Ltd

Inventors

• Maeda Ryoh
• Miyano Yuki

Classifications

• A61B5/6889

  Rooms · CPC title

• A61B2562/0223

  Magnetic field sensors · CPC title

• G01R33/0076

  Protection, e.g. with housings against stray fields · CPC title

• A61B5/0093

  Detecting, measuring or recording by applying one single type of energy and measuring its conversion into another type of energy · CPC title

• A61B5/7217

  of noise originating from a therapeutic or surgical apparatus, e.g. from a pacemaker · CPC title