Carriero A, Tonni G, Magarelli N, Iezzi A, Bonomo L
Istituto di Scienze Radiologiche e Formazione dell'Immagine, Università G. D'Annunzio, Chieti.
Radiol Med. 1993 Mar;85(3):176-81.
Twenty volunteers were examined by means of 2D and 3D time of flight (TOF) Magnetic Resonance angiography (MRA) of the renal arteries. The possible diagnostic applications of MRA were also evaluated in 6 patients with renovascular diseases. MRA examinations of the renal arteries were performed with a 1.5 T superconductive magnet (Magnetom Siemens) and circular body coil. Ten volunteers were studied with 3D FISP sequences (FA 25 degrees, TR 40 ms, TE 7 ms, ST 1 mm, Ma 256 x 256, FOV 500); the images were acquired on the axial plane and were rotated, in MIP and target MIP, on the axial (z) and sagittal (x) axes. The other 10 volunteers were studied with 2D FLASH sequences (FA 18 degrees, TR 300 ms, TE 8 ms, ST 4 mm, overlap 1 mm, Ma 256 x 256, FOV 500); the images were acquired on the axial and coronal planes and were rotated, in MIP and target MIP, on the axial (z) and sagittal (x) axes. The ostium and proximal segments (1-15 mm) were always easily identified with 2D and 3D sequences, the distal segments (16-35 mm) were also clearly demonstrated in 11 cases with 3D (55%) and in 16 cases with 2D (85%) sequences. The bifurcations and branch vessels of the renal arteries were easily depicted with 3D TOF sequences in 7 cases only. Combined 3D and 2D TOF images permitted the thorough evaluation of the renal arteries. In renovascular diseases, 2D and 3D TOF images clearly demonstrated occlusions and stenoses of the proximal segment (1-15 mm). 2D TOF sequences only permitted the visualization of a case of fibromuscular dysplasia in the distal segment. Our results suggest that 2D and 3D TOF MRA exhibits good potentials as a noninvasive screening technique for the evaluation of renovascular diseases.
通过二维和三维时间飞跃（TOF）磁共振血管造影（MRA）对20名志愿者的肾动脉进行了检查。还对6例肾血管疾病患者评估了MRA的可能诊断应用。肾动脉的MRA检查使用1.5T超导磁体（西门子Magnetom）和体部圆形线圈进行。10名志愿者采用三维快速成像稳态进动序列（FA 25°，TR 40ms，TE 7ms，层厚1mm，矩阵256×256，视野500）进行研究；图像在轴位平面采集，并在最大密度投影（MIP）和目标MIP中在轴位（z）和矢状位（x）轴上旋转。另外10名志愿者采用二维快速低角度激发序列（FA 18°，TR 30ms，TE 8ms，层厚4mm，重叠1mm，矩阵256×256，视野500）进行研究；图像在轴位和冠状位平面采集，并在MIP和目标MIP中在轴位（z）和矢状位（x）轴上旋转。肾动脉的开口和近端节段（1 - 15mm）用二维和三维序列总能轻易识别，远端节段（16 - 35mm）在11例三维序列（55%）和16例二维序列（85%）中也能清晰显示。肾动脉的分支和分支血管仅在7例中用三维TOF序列能轻易描绘。三维和二维TOF图像联合可对肾动脉进行全面评估。在肾血管疾病中，二维和三维TOF图像清晰显示了近端节段（1 - 15mm）的闭塞和狭窄。二维TOF序列仅能显示1例远端节段的纤维肌发育异常。我们的结果表明，二维和三维TOF MRA作为一种评估肾血管疾病的非侵入性筛查技术具有良好的潜力。
