Design and calibration methods of brain magnetic measurement helmet

Abstract

The invention relates to design and calibration methods of a brain magnetic measurement helmet. According to the design of a head-mounted brain magnetic measurement helmet, the helmet is expanded outwards by 1 cm according to the actual shape of ahead subjected to three-dimensional scanning to serve as a helmet curved surface; inserting grooves are formed according to the size of an SERF atom magnetometer; and three datum points are marked on the helmet to be used for subsequent coordinate conversion of the positions and directions of the inserting grooves. In cooperation with a designed helmet with reference point marks, a three-dimensional optical scanner or a point position tracker is used for determining the human brain and three reference points of the helmet when the helmet is worn;and calibration of the positions and directions of all inserting grooves of the helmet under a human brain coordinate system is achieved through the coordinates of the center positions of the upper surfaces and the lower surfaces of the inserting grooves according to the coordinate system conversion relation.

Description

Technical field [0001] The invention relates to the field of biomedical instruments, in particular to a device system that uses an atomic magnetometer, such as a SERF (Spin-Exchange Relaxation-Free) atomic magnetometer for brain magnetic measurement. Background technique [0002] Magnetoencephalography (MEG) is widely used in epileptic focus location, mental illness diagnosis, cognitive psychology research, etc. The current magnetoencephalography is mainly based on the superconducting quantum interferometer (SQUID) system. Due to its high cost and the disadvantages of high operation and maintenance costs due to the need for liquid helium cooling, the promotion and use of this system is subject to certain restrictions . [0003] At present, a magnetoencephalography system based on the SERF atomic magnetometer has appeared. The SERF atomic magnetometer used by the system can achieve a sensitivity equivalent to that of the SQUID magnetoencephalography system. It can be used at room t...

AI Technical Summary

Problems solved by technology

Existing wearable magnetic encephalometry equipment usually does not include whole brain measurement, and because the helmet only provides the carrier function, usually only measurement data can be obtained, and it is impossible to obtain the same data as the existing commercial magnetic encephalometry equipment. Sensor position and orientation information in the coordinate system

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