Kominami M, Yamada N, Imakita S, Uchida R, Kuribayashi S, Kimura K, Takamiya M
Department of Diagnostic Radiology, School of Medicine, Keio University Hospital.
Nihon Igaku Hoshasen Gakkai Zasshi. 1999 Sep;59(11):504-9.
To compare the quality and diagnostic accuracy of images of intracranial steno-occlusive lesions obtained by conventional MRA and turbo MRA reconstructed using the zero-filled interpolation technique in the slice-select direction.
Eighteen patients with suspected steno-occlusive lesions of the intracranial arteries were studied with two types of three-dimensional time-of-flight angiography and conventional digital subtraction angiography. In total, 45 steno-occlusive lesions were quantitatively measured using calipers and correlated with DSA stenosis. A phantom that simulated vessels with stenosis was also imaged using the two types of MRA under the same conditions as those employed in the clinical study.
Compared with conventional MRA, turbo MRA reduced the jaggedness of vessels and offered appearances more similar to those of DSA in the antero-posterior and lateral views. The severity of stenosis was classified into five grades based on the percentage of occlusion: not significant (0-24%), mild (25-49%), moderate (50-74%), severe (75-99%), and occlusive (100%). Neither turbo MRA nor conventional MRA showed any discrepancy from DSA above grade-1 stenosis.
The advantage of turbo MRA is its ability to reduce the jaggedness of vessels on conventional MRA, and to simplify the recognition of vessel contours without prolonging acquisition time. Turbo MRA and conventional MRA have equally high diagnostic accuracy for steno-occlusive lesions.
比较常规磁共振血管造影（MRA）和采用零填充插值技术在层面选择方向重建的快速自旋回波MRA（turbo MRA）所获得的颅内狭窄闭塞性病变图像的质量和诊断准确性。
对18例疑似颅内动脉狭窄闭塞性病变的患者进行了两种三维时间飞跃血管造影和常规数字减影血管造影研究。总共使用卡尺对45个狭窄闭塞性病变进行了定量测量，并与数字减影血管造影（DSA）测量的狭窄程度进行相关性分析。还使用与临床研究相同的条件，对模拟血管狭窄的体模进行了两种MRA成像。
与常规MRA相比，turbo MRA减少了血管的锯齿状，在前后位和侧位视图中显示出与DSA更相似的外观。根据闭塞百分比，将狭窄程度分为五个等级：不显著（0-24%）、轻度（25-49%）、中度（50-74%）、重度（75-99%）和闭塞（100%）。对于1级以上的狭窄，turbo MRA和常规MRA与DSA相比均未显示出任何差异。
turbo MRA的优势在于能够减少常规MRA上血管的锯齿状，简化血管轮廓的识别，且不延长采集时间。turbo MRA和常规MRA对狭窄闭塞性病变具有同样高的诊断准确性。
