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국회도서관 홈으로 정보검색 소장정보 검색

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Phase Contrast MR Angiography(PC MRA) is excellent MRA technique for measuring the velocity of vessels in the human body. PC MRA need to at least four images for angiogram reconstruction and it caused longer scan time. Therefore, we used keyhole imaging combined PC MRA to reduce the scan time. However, keyhole imaging can lead the erroneous effects as loss of phase information or frequency discontinuous. In this study, we applied the keyhole imaging combined 2D PC MRA for improving the temporal resolution and also measured the velocity to evaluate the accuracy of phase information. We used 0.32T MRI scanner(Magfinder II, Scimedix, Korea). Using the 2D PC MRA pulse sequence, the vascular images for a human brain targeted on the Superior Sagittal Sinus(SSS) were obtained. We applied tukey window function for keyhole images to minimize the ringing artifact and erroneous factors that are induced frequency discontinuous and phase information loss. We also applied zero-padded algorithm to peripheral missing k-space lines to compare keyhole imaging results and the artifact power(AP) value was measured on the complex difference images to validate the image quality. Consider as based on our results, heavy image distortions and artifacts were shown until using at least 50% keyhole factor. Using above the 50% keyhole factors are shown well reconstructed and matched for magnitude images and velocity information measurements. In conclusion, we confirmed the image quality and velocity information of keyhole technique combined 2D PC MRA. Especially, measured velocity information through the keyhole imaging combination was similar to the velocity information of full sampled k-space image despite of frequency discontinuous and phase information loss in the keyhole imaging reconstruction process. Consequently, the keyhole imaging combined 2D PC MRA will give some clinical usefulness and advantages as improving the temporal resolution and measuring the velocity information via selecting the appropriate keyhole factor at low tesla MRI system.

권호기사

권호기사 목록 테이블로 기사명, 저자명, 페이지, 원문, 기사목차 순으로 되어있습니다.
기사명 저자명 페이지 원문 목차
실시간 광단층 모니터링 안구 수술용 현미경 프로브 개발 김경운, 이창호, 정효상, 한승훈, 김홍균, 김지현 pp.53-58

WCDMA 휴대전화 전자파에 의한 심호흡계 영향 권민경, 최재림, 최준열, 장경환, 김성권, 김덕원 pp.59-64

손목 움직임 추정을 위한 Gaussian Mixture Model 기반 표면 근전도 패턴 분류 알고리즘 정의철, 유송현, 이상민, 송영록 pp.65-71

Keyhole Imaging기법을 적용한 위상대조도 자기공명 혈관조영기법 이동훈, 홍철표, 한봉수, 이만우 pp.72-77

전방십자인대 손상으로 인한 슬관절 불안정성에 따른 경골 골단 해면골 미세구조 변화 : 내방과 외방에서의 해면골 미세구조 패턴 변화 이주형, 전경진, 김한성, 임도형 pp.78-88

실리콘겔 인공유방의 기계적 및 물리화학적 특성에 대한 연구 백홍, 장동혁, 송정민, 이승영, 서무엽, 박길종, 맹은호 pp.89-97

족관절 근육의 전운동 시간과 전기역학적 지연 분석 : 앉은 자세와 선 자세의 비교 김지원, 정홍영, 권유리, 김효희, 엄광문, 박병규 pp.98-103

참고문헌 (24건) : 자료제공( 네이버학술정보 )

참고문헌 목록에 대한 테이블로 번호, 참고문헌, 국회도서관 소장유무로 구성되어 있습니다.
번호 참고문헌 국회도서관 소장유무
1 Phase contrast using multiecho steady‐state free precession 네이버 미소장
2 Comparison of time-of-flight and phase-contrast MR neuroangiographic techniques. 네이버 미소장
3 PC HYPR flow: A technique for rapid imaging of contrast dynamics 네이버 미소장
4 Three-dimensional phase-contrast MR angiography in the head and neck: preliminary report. 네이버 미소장
5 C.L. Dumoulin, S.P. Souza, M.F. Walker and W. Wagle“Three-dimensional Phase Contrast Angiography”, MagnReson Imaging, vol. 9, no. 1, pp. 139-149, 1989. 미소장
6 Phase-contrast MR angiography with reduced acquisition time: New concepts in sequence design 네이버 미소장
7 "Keyhole" method for accelerating imaging of contrast agent uptake. 네이버 미소장
8 Improved vessel delineation in keyhole time-resolved contrast-enhanced MR angiography using a gadolinium doped flush. 네이버 미소장
9 Limitations of the keyhole technique for quantitative dynamic contrast‐enhanced breast MRI 네이버 미소장
10 Simulation of spatial and contrast distortions in keyhole imaging. 네이버 미소장
11 On the "keyhole" technique. 네이버 미소장
12 S.O. Schoenberg, O. Dietrich and M.F. Reiser, Parallel imaging in Clinical MR Applications, Springer, 2007, pp 91-103. 미소장
13 The effects of K-space data undersampling and discontinuities in keyhole functional MRI 네이버 미소장
14 Keyhole and zero-padding approaches for reduced-encoding diffusion tensor imaging of the mouse brains 네이버 미소장
15 Does the ’keyhole' technique improve spatial resolution in MRI perfusion measurements? A study in volunteers 네이버 미소장
16 Benefits and pitfalls of keyhole imaging, especially in first‐pass perfusion studies 네이버 미소장
17 R.H. Hashemi, W.G. Bradley Jr and C.J. Lisanti, MRI The Basics, 3rd ed, Lippincott Williams & Wilkins, 2010, pp. 146-163. 미소장
18 D.W. McRobbie, E.A. Moore, M.J. Graves and M.R. Prince, MRI From Picture to Proton, 2nd ed, United Kingdom: Cambridge Univ. Press, 2004, pp. 108-136. 미소장
19 M.A. Bernstein, K.F. King and X.J. Zhou, Handbook of MRI Pulse Sequence, Elsevier Academic Press, 2007, pp. 494-499. 미소장
20 A.S. Nencka and D.B. Rowe, “Apodization and smoothing alter voxel time series correlations”, in Proc. 16th Intl Soc Mag Reson Med, Toronto, Canada, 2008, pp. 2457. 미소장
21 Time series tapering for short data samples 네이버 미소장
22 Effect of windowing and zero‐filled reconstruction of MRI data on spatial resolution and acquisition strategy 네이버 미소장
23 PULSAR: A Matlab toolbox for parallel magnetic resonance imaging using array coils and multiple channel receivers 네이버 미소장
24 Self-calibrating Coil Sensitivity Profiles for Parallel Imaging Based on Anisotropic Diffusion 네이버 미소장