具有并行采集和T2衰减补偿的HASTE序列：在颈动脉成像中的应用。
HASTE sequence with parallel acquisition and T2 decay compensation: application to carotid artery imaging.
作者信息
Zhang Ling, Kholmovski Eugene G, Guo Junyu, Choi Seong-Eun Kim, Morrell Glen R, Parker Dennis L
机构信息
Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, UT 84108, USA.
出版信息
Magn Reson Imaging. 2009 Jan;27(1):13-22. doi: 10.1016/j.mri.2008.05.009. Epub 2008 Jul 22.
Abstract
T2-weighted carotid artery images acquired using the turbo spin-echo (TSE) sequence frequently suffer from motion artifacts due to respiration and blood pulsation. The possibility of using HASTE sequence to achieve motion-free carotid images was investigated. The HASTE sequence suffers from severe blurring artifacts due to signal loss in later echoes due to T2 decay. Combining HASTE with parallel acquisition (PHASTE) decreases the number of echoes acquired and thus effectively reduces the blurring artifact caused by T2 relaxation. Further improvement in image sharpness can be achieved by performing T2 decay compensation before reconstructing the PHASTE data. Preliminary results have shown successful suppression of motion artifacts with PHASTE imaging. The image quality was enhanced relative to the original HASTE image, but was still less sharp than a non-motion-corrupted TSE image.
摘要
使用快速自旋回波（TSE）序列采集的T2加权颈动脉图像经常因呼吸和血液搏动而出现运动伪影。研究了使用半傅里叶采集单次激发快速自旋回波（HASTE）序列获得无运动颈动脉图像的可能性。由于T2衰减导致后期回波信号丢失，HASTE序列存在严重的模糊伪影。将HASTE与并行采集（PHASTE）相结合可减少采集的回波数量，从而有效减少由T2弛豫引起的模糊伪影。在重建PHASTE数据之前进行T2衰减补偿可进一步提高图像清晰度。初步结果表明，PHASTE成像成功抑制了运动伪影。相对于原始HASTE图像，图像质量有所提高，但仍不如无运动干扰的TSE图像清晰。
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