본 연구의 목적은 고해상도 미세영상을 얻을 수 있는 기술을 확보하기 위하여 나선형 multi-turned RF 표면코일(surface coil)의 민감도(sensitivity)를 평가하고자 하였다. RF 코일의 자기장 분포를 시...
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https://www.riss.kr/link?id=A100687350
우동철 (가톨릭대학교) ; 하승훈 (University of California, Irvine, USA) ; 최치봉 (경희대학교) ; 최보영 (가톨릭대학교) ; Woo, Dong-Cheol ; Ha, Seung-Hoon ; Choi, Chi-Bong ; Choe, Bo-Young
2006
Korean
KCI등재
학술저널
153-158(6쪽)
0
0
상세조회0
다운로드국문 초록 (Abstract)
본 연구의 목적은 고해상도 미세영상을 얻을 수 있는 기술을 확보하기 위하여 나선형 multi-turned RF 표면코일(surface coil)의 민감도(sensitivity)를 평가하고자 하였다. RF 코일의 자기장 분포를 시...
본 연구의 목적은 고해상도 미세영상을 얻을 수 있는 기술을 확보하기 위하여 나선형 multi-turned RF 표면코일(surface coil)의 민감도(sensitivity)를 평가하고자 하였다. RF 코일의 자기장 분포를 시뮬레이션 함으로서 자기장의 불균질성 (inhomogeniety)을 조사하고, 그 결과를 토대로 개선된 RF 코일을 디자인할 수 있다. 1, 3, 5번씩 감은 나선형 코일을 조사 한 결과, 3번 감은 나선형 코일의 민감도가 가장 높은 것으로 나타났다. 이를 통하여 나선형 RF 코일의 감는 횟수를 조절함으로써 코일의 민감도를 향상시킬 수 있다는 것을 확인할 수 있었다. 그리고 지나치게 감는 횟수를 늘리면 오히려 코일의 impedance를 증가시키게 되어 민감도를 감소시키며, 동시에 matching이 어려워진다는 사실을 확인하였다. 본 연구의 결과로서 지름이 4 cm인 나선형 wire RF 표면코일의 최적의 감는 횟수를 발견하였다. 또한 나선형 표면코일에서 감는 횟수의 증가는 항상 민감도에 긍정적인 영향을 미치는 것이 아니며, 반드시 최적의 감는 횟수를 찾아야 한다는 것을 확인하였다.
다국어 초록 (Multilingual Abstract)
The purpose of this study was to improve the technique so as to develop an advanced sensitive RF surface coil for investigating the sensitivities of the multi-spiral surface coils, and we eventually wanted to achieve high resolution of the microscopic...
The purpose of this study was to improve the technique so as to develop an advanced sensitive RF surface coil for investigating the sensitivities of the multi-spiral surface coils, and we eventually wanted to achieve high resolution of the microscopic MR images and MR spectra. The magnetic field inhomogeneity and shape of a surface coil were statistically estimated by simulation of the magnetic field distribution. On the basis of the experimental results with single, 3 and S-turned spiral RF surface coils, we found that the 3-turned coil had the highest sensitivity. The present study showed that the sensitivity of the RF surface coil was improved by increasing the number of spiral coil turns, and also the SNR of the RF surface coil was dependent upon the number of spiral coil turns. However, we found, rather strikingly, that the sensitivity of excessive turns of the coils was decreased due to the rise of the coil's Impedance. Thus, the present results demonstrated that the sensitivity was not proportional to the number of a spiral RF coil's turns, and the number of spiral coil turns should be optimized for obtaining the highest sensitivity and SNR.
참고문헌 (Reference)
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1 Song HP, "Three-dimensional microscopic MRI of maize kernels during drying" 53 : 51-69, 1992
2 Hoult DI, "The signal-to-noise ratio of the nuclear magnetic resonance experiment" 24 : 71-85, 1976
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4 Rallan D, "Skin imaging: is it clinically useful?" 29 : 453-459, 2004
5 Hoult DI, "Sensitivity and power deposition in a high-field imaging experiment" 12 : 46-67, 2000
6 Jayasundar R, "RF coils for combined MR and hyperthermia studies: II. MR coil as a hyperthermic applicator" 19 : 117-122, 2001
7 Zhang X, "Micro-strip RF surface coil design for extremely high-field MRI and spectroscopy" 46 : 443-450, 2001
8 Almazana RP, "Magnetometric sensors based on planar spiral coils" 245 : 630-632, 2003
9 Bulte JWM, "Magnetic resonance microscopy and histology of the CNS" 20 : 24-27, 2002
10 Haacke EM, "Magnetic Resonance Imaging Physical Principles and Sequence Design. 1st ed." A John Wiley & Sons Inc., New York 850-861, 1999
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학술지 이력
연월일 | 이력구분 | 이력상세 | 등재구분 |
---|---|---|---|
2024 | 평가예정 | 재인증평가 신청대상 (재인증) | |
2021-01-01 | 평가 | 등재학술지 선정 (계속평가) | ![]() |
2019-01-01 | 평가 | 등재후보학술지 선정 (신규평가) | ![]() |
2016-12-01 | 평가 | 등재후보 탈락 (계속평가) | |
2015-12-01 | 평가 | 등재후보로 하락 (기타) | ![]() |
2014-07-10 | 학술지명변경 | 외국어명 : Korean Journal of Medical Physics -> PROGRESS in MEDICAL PHYSICS | ![]() |
2011-01-01 | 평가 | 등재학술지 유지 (등재유지) | ![]() |
2009-01-01 | 평가 | 등재 1차 FAIL (등재유지) | ![]() |
2006-01-01 | 평가 | 등재학술지 선정 (등재후보2차) | ![]() |
2005-01-01 | 평가 | 등재후보 1차 PASS (등재후보1차) | ![]() |
2003-07-01 | 평가 | 등재후보학술지 선정 (신규평가) | ![]() |