Walter C, Philippi G, Westerhausen R, Kooijman H, Hoffmann H G, Busch H P
Abteilung für Radiologie, Krankenhaus der Barmherzigen Brüder, Trier.
Rofo. 2003 Sep;175(9):1244-50. doi: 10.1055/s-2003-41937.
To compare three dimensional contrast enhanced MR angiography with parallel imaging technique (sensitivity encoding) to standard MR angiography technique.
CE-3D MRA of renal arteries was performed in 22 patients (23 examinations) on a 1.5 T MR- scanner (Gyroscan Intera, Philips, Netherlands). For contrast enhanced MRA a single dose of Gd-DTPA (0.1 mmol/kg b.w.) was administered. Group I: The following standard 3D gradient echo (GE) sequence was performed in 9 of the 22 patients: TR: 4.3 ms, TE: 1.5 ms, flip angle: 40, 40 slices, scan duration: 19 seconds. A spatial resolution of 1.96 x 1.76 x 3.0 mm (3) (1.76 x 1.76 x 1.5 mm (3) interpolated) was obtained. Group II: 14 examinations were acquired in 13 patients: TR, TE and flip angle were equal compared to the first protocol. The k-space lines were acquired with CENTRA (contrast-enhanced time robust angiography) and parallel imaging technique (SENSE). 60 slices were acquired, scan duration was 24 seconds. The spatial resolution of this sequence was 1.19 x 1.08 x 2.0 mm (3) (0,84 x 0,84 x 1,0 mm (3) interpolated). Original images and calculated maximum intensity projection (MIP) images were analysed by two radiologists. Image quality and the visibility of renal arteries were rated on a four-point scale.
In the first group the image quality was rated "good" in 8/9 patients. The renal arteries were detected in all cases and rated "good". The anterior and posterior segments were rated "good" in only 5/9 and the lobar arteries were detectable only in 3 of 9 cases. The interlobar arteries could not be seen in these patients. In the second group the image quality was rated excellent in 5 examinations and good in 9 of 14 examinations. The rating for the renal arteries was excellent in all examinations (14/14). The results of the anterior and posterior segment were as followed: excellent 5/14, good 7/14, insufficient 2/14; the lobar arteries: good 6/14, insufficient 6/14 and not detectable 2/14. Interlobar arteries could be seen in 7/14 examinations, but the quality was insufficient. In 7/14 the interlobar arteries could not be detected.
The use of parallel imaging technique improves image quality and the delineation of small vessels in renal MRA.
比较采用并行成像技术（敏感性编码）的三维对比增强磁共振血管造影与标准磁共振血管造影技术。
在一台1.5T磁共振扫描仪（荷兰飞利浦公司的Gyroscan Intera）上对22例患者（23次检查）进行肾动脉的对比增强三维磁共振血管造影（CE-3D MRA）。对于对比增强磁共振血管造影，给予单剂量的钆喷酸葡胺（0.1 mmol/kg体重）。第一组：22例患者中的9例采用以下标准三维梯度回波（GE）序列：重复时间（TR）：4.3毫秒，回波时间（TE）：1.5毫秒，翻转角：40°，40层，扫描时间：19秒。获得的空间分辨率为1.96×1.76×3.0 mm³（插值后为1.76×1.76×1.5 mm³）。第二组：13例患者进行了14次检查：TR、TE和翻转角与第一个方案相同。采用CENTRA（对比增强时间稳健血管造影）和并行成像技术（敏感性编码）采集k空间线。采集60层，扫描时间为24秒。该序列的空间分辨率为1.19×1.08×2.0 mm³（插值后为0.84×0.84×1.0 mm³）。两位放射科医生对原始图像和计算得出的最大强度投影（MIP）图像进行分析。图像质量和肾动脉的可视性按四点量表进行评分。
在第一组中，8/9例患者的图像质量被评为“良好”。所有病例均检测到肾动脉，且评级为“良好”。仅5/9例患者的前后段评级为“良好”，9例中仅3例可检测到叶间动脉。这些患者中未见到小叶间动脉。在第二组中，5次检查的图像质量被评为优秀，14次检查中的9次被评为良好。所有检查（14/14）中肾动脉的评级均为优秀。前后段的结果如下：优秀5/14，良好7/14，不足2/14；叶间动脉：良好6/14，不足6/14，不可检测2/14。14次检查中有7次可见小叶间动脉，但质量不足。14次中有7次未检测到小叶间动脉。
并行成像技术的应用提高了肾磁共振血管造影的图像质量和小血管的显示清晰度。
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