Three-dimensional Image Registration of Magnetocardiogram to Torso Surface

• Main Authors: Chia-Lun Shu, 許嘉倫
• Other Authors: 鄭振宗
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/ycz74e

碩士 === 國立臺北科技大學 === 機電整合研究所 === 93 === The magnetocardiogram (MCG) and electrocardiogram (ECG) are the functional medical images without the anatomical information of torso. To solve the electromagnetic source inverse problem from the MCG or ECG data, the three-dimensional body-surface measurement is essential in determining the geometrical boundary of torso for meshing. In order to locate the torso surface, we devise the magnetic position sensing and the three-dimensional body-surface measurement techniques for the MCG system. The magnetic position sensing device consists of the transmitter circuit to generate the ac gradient magnetic field at 1.5 kHz, and the dual-phase lock-in amplifier to detect the in-phase and quadrature-phase magnetic signal sensed by the receiver. The receiver is the SQUID magnetometer in the MCG system, which measures the cardiomagnetic and the 1.5-kHz sinusoidal magnetic signal at the same time. The output of the lock-in amplifier is linearly proportional to the SQUID''s horizontal position which can be correlated with the torso surface according to the optical measurement. The current result is the basis for solving the cardiomagnetic source inverse problem.