원문정보
초록
영어
Heart consists of myocardium cells and the electrophysiological activity of the cells generate magnetic fields. By measuring this magnetic field, magnetocardiogram (MCG), functional diagnosis of the heart diseases is possible. Since the strength of the MCG signals is weak, typically in the range of 1-10 pT, we need sensitive magnetic sensors. Conventionally, superconducting quantum interference devices (SQUID)s were used for the detection of MCG signals due to its superior sensitivity to other magnetic sensors. However, drawback of the SQUID is the need for regular refill of a cryogenic liquid, typically liquid helium for cooling lowtemperature SQUIDs. Efforts to eliminate the need for the refill in the SQUID system have been done by using cryocooler-based conduction cooling or use of non-cryogenic sensors, or room-temperature sensors. Each sensor has advantage and disadvantage, in terms of magnetic field sensitivity and complexity of the system, and we review the recent trend of MCG technology.
목차
1. 서론
2. SQUID를 이용한 심자도 장치
2.1. SQUID 기반 심자도 장치의 구성요소
2.2. SQUID 채널 수 및 검출코일 구조
3. 상온 자기센서를 이용한 심자도 장치
3.1. 원자자력계(광펌핑 자력계) 기반 심자도 장치
3.2. 인덕션 코일을 이용한 심자도 장치
3.3. Fluxgate 자력계를 이용한 심자도 장치
3.4. 자기저항소자 자력계를 이용한 심자도 장치
4. 결론
REFERENCES