서지주요정보
Generalized flow imaging in NMR : application to angiography of coronary vessel = 핵자기 공명 단층 촬영에서 유속 영상의 일반적인 고찰과 관상동맥 조영술에의 응용에 관한 연구
서명 / 저자 Generalized flow imaging in NMR : application to angiography of coronary vessel = 핵자기 공명 단층 촬영에서 유속 영상의 일반적인 고찰과 관상동맥 조영술에의 응용에 관한 연구 / Chi-Woong Mun.
저자명 Mun, Chi-Woong ; 문치웅
발행사항 [대전 : 한국과학기술원, 1991].
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8002331

소장위치/청구기호

학술문화관(문화관) 보존서고

DEE 9131

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초록정보

The basic principles of NMR flow imaging is generally discussed to help understanding the concept of the NMR flow imaging and the angiography technique, especially of the coronary angiography. Two categories of flow imaging method, i.e., phase sensitive method (velocity sensitive method) and in-flow sensitive method (time-of-flight method) are given for flow imaging and angiography. Early study of the phase sensitive techniques such as flow velocity map are presented together with the improved high-speed NMR flow-velocity measurement technique using a differential phase-encoding. In this thesis, coronary vessel angiography which uses 3-D NMR angiography method with 2-D planar image scanning is suggested and its potential is shown by its experimental results for healthy volunteer. On the basis of the principles of the time-of-flight method and the 3-D angiogram obtained by the 2-D planar image scanning technique using glow rehased gradient echo sequence with 90˚ RF pulse and short repetition time a coronary angiogram has been attempted, In this technique in order to obtain the maximum contrast between heart wall and blood flow a 90˚ RF flip angle SSFP technique has been used in conjunction with thin slice selection. In addition, the cine NMR imaging technique is incorporated in synchronizing ECG R waves to reduce the motion artifact and at the same time to induce the saturation effect on the static samples. Images of the large bulk blood flow corresponding to the heart chamber and descending aorta are further removed by the postprocessing using boundary detection and segmentation. The final 3-D angiogram is then formed by stacking the 2-D images with and contrast is further enhanced by maximum ray tracing algorithm. Scan time reduction of 3-D magnetic resonance angiography using a 2-D planar image scanning technique based on the time-of flight method and the time-multiplexed multislice acquisition technique is also proposed. The procedure involves the sequentially contiguous and simultaneous data acquisition of the two thin (1.2mm) 2-D planar slices by dividing imaging region into two part in the slice-selection direction. The 90˚RF pulse with short repetition time($

서지기타정보

서지기타정보
청구기호 {DEE 9131
형태사항 xii, 79 p. : 삽도 ; 26 cm
언어 영어
일반주기 저자명의 한글표기 : 문치웅
지도교수의 영문표기 : Zang-Hee Cho
지도교수의 한글표기 : 조장희
학위논문 학위논문(박사) - 한국과학기술원 : 전기및전자공학과,
서지주기 Reference : p. 61-72
주제 Angiography
Coronary arteries
Tomography
Scanning systems
NMR 이미징 --과학기술용어시소러스
혈관 조영 --과학기술용어시소러스
단층 촬영법 --과학기술용어시소러스
관상 동맥 --과학기술용어시소러스
유속 측정 --과학기술용어시소러스
Magnetic resonance imaging
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