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에코의 개수와 임의 잡음이 T2 이완영상의 구성에 미치는 영향 연구 : 8에코 CPMG 영상화 펄스열의 개발

Other Titles
 The Effect of Number of Echoes and Random Noise on T2 Relaxography : Development of 8-Echo CPMG 
 정은기  ;  서인석  ;  김동익  ;  이삼현  ;  원진임 
 Journal of the Korean Society of Magnetic Resonance in Medicine (대한자기공명의과학회지), Vol.2(1) : 67-72, 1998 
Journal Title
Journal of the Korean Society of Magnetic Resonance in Medicine(대한자기공명의과학회지)
Issue Date
The mapping of the spin-spin relaxation time T2 in pixel-by-pixel was suggested as a quantitative diagnostic tool in medicine. although the CPMG pulse sequence has been known to be the best pulse sequence for T2 measurement in physics NMR, the supplied pulse sequence by the manufacture of MRI system was able to obtain the maximum of 4 CPMG images. Eight or more images with different echo time TEs are required to construct a reliable T2 map, so that two or more acquisitions were required, which easily took more than 10 minutes. 4-echo CPMG imaging pulse sequence was modified to generate the maximum of 8 MR images with evenly spaced echo time TEs. In human MR imaging, since patients tend to move at least several pixels between the different acquisitions, 8-echo CPMG imaging sequence reduces the acquisition time and may remove any mis-regitration of each pixels signal for the fitting of T2. The resultant T2 maps using the theoretically simulated images and using the MR images of the human brain suggested that 8 echo CPMG sequence with short echo spacing such as 17-20 msec can give the reliable T2 map.
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1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Dong Ik(김동익)
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