摘要
目的 探讨 3DK 空间Kz轴数据不对称填充方法在 3DTOF脑动脉MRA的应用价值。方法 40例患者行Kz轴K 空间数据不对称填充的 3DTOF脑动脉MRA (TurboMRA)及Kz轴K 空间数据对称填充的 3DTOF脑动脉MRA(常规MRA) ,在 3D源图像和MIP图像上比较二种方法的影像质量、成像时间及显示血管的能力。结果 Kz轴不对称K 空间填充3DTOF脑动脉MRA与Kz轴对称K 空间填充 3DTOF脑动脉MRA相比 ,影像质量指标 (S/N、C/N、Rz)、采集时间TA、血管显示能力等均有显著性差异 (P <0 .0 1)。结论 Kz轴K 空间不对称填充 3DTOF脑动脉MRA与常规 3DTOF脑动脉MRA相比成像质量更佳 ,显示血管更多 ,节约采集时间 44 %。
Objective To investigate the value of 3D TOF MRA of intracranial vessels with K-space asymmetrically filled by the data in Kz axis. Methods Forty subjects underwent two kinds of 3D TOF MRA sequences with and without K-space asymmetrically filled by the data in Kz axis. On the source images and MIP images of these two sequences, the image quality,acquisition time,and the visualization of vessels were compared. Results Compared with those of routine method, 3D TOF MRA with K-space asymmetrically filled by the data in Kz axis showed significant difference in SNR, CNR,acquisition time, spatial resolution and vessel visualization ( P <0.01). Conclusion 3D TOF MRA with K-space asymmetrically filled by the data in Kz axis improves image quality and the visualization of intracranial vessels, and saves the acquisition time by 44%.
出处
《中国医学影像技术》
CSCD
2004年第9期1437-1439,共3页
Chinese Journal of Medical Imaging Technology
