지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
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.
목차
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참고문헌 (24)
참고문헌 신청
A.S. Nencka / 2008 / Apodization and smoothing alter voxel time series correlations / in Proc. 16th Intl Soc Mag Reson Med : 2457 ~
C. Oesterle / 2000 / Benefits and pitfalls of keyhole imaging, especially in first-pass perfusion studies / J Magn Reson Imaging 11 (3) : 312 ~ 323
C.L. Dumoulin / 1989 / Three-dimensional Phase Contrast Angiography / MagnReson Imaging 9 (1) : 139 ~ 149
D.W. McRobbie / 2004 / MRI From Picture to Proton, 2nd ed / Cambridge Univ. Press : 108 ~ 136
J. Beranek-Chiu / 2009 / Improved vessel delineation in keyhole time-resolved contrast-enhanced MR angiography using a gadolinium doped flush / J Magn Reson Imaging 29 (5) :
C. Oesterle / 2000 / Benefits and pitfalls of keyhole imaging, especially in first-pass perfusion studies / J Magn Reson Imaging 11 (3) : 312 ~ 323
C.L. Dumoulin / 1989 / Three-dimensional Phase Contrast Angiography / MagnReson Imaging 9 (1) : 139 ~ 149
D.W. McRobbie / 2004 / MRI From Picture to Proton, 2nd ed / Cambridge Univ. Press : 108 ~ 136
J. Beranek-Chiu / 2009 / Improved vessel delineation in keyhole time-resolved contrast-enhanced MR angiography using a gadolinium doped flush / J Magn Reson Imaging 29 (5) :
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