Carriero A, Palumbo L, Salute L, Bonomo L
Istituto di Scienze Radiologiche e Formazione dell'Immagine, Università, Chieti.
Radiol Med. 1990 Sep;80(3):213-8.
The authors identified the standard projections for studying neck vessels with magnetic resonance angiography. Sixty volunteers underwent angio-MR of the arterial neck vessels with FISP 3D FT sequences obtained on the coronal and sagittal planes. The gradient-echo sequence (FISP 3D FT) was acquired with TR = 0.04-0.08 s and TE = 15 ms, with 25 degrees flip angle. Single excitated slices of thickness ranging from 1-2 mm were included in the acquisition volume. These sequences were subsequently processed by the maximum intensity projection method. Two radiologists examined our results to choose the optimal projections. We used a semiquantitative scale which allowed us to distinguish 3 different diagnostic levels for each projection: well-visualized vessels, poorly-visualized, and non-visualized ones. For each section axial rotations were performed ranging from 0 degree to 180 degrees, with 15 degrees intervals. On the coronal plane, rotations from -45 degrees to 45 degrees were the optimal ones to visualize the studied vessels. The 0 degree-15 degrees-30 degrees-45 degrees-135 degrees-165 degrees-180 degrees projections allowed the common carotids to be clearly demonstrated together with the vertebral arteries. The other projections appeared to be useless for diagnostic purposes. On the sagittal plane, rotations from 60 degrees to 120 degrees were the optimal ones. The 90 degrees projection allowed the demonstration of all the big arterial vessels of the neck, including carotid bifurcation and internal and external carotids. The assessment of the optimal diagnostic projections for angio-MR of the neck vessels is helpful to reduce post-processing time. As a matter of fact, the immediate visualization, during the examination, of the standard projections allows further acquisitions to be obtained--if needed--to try to solve specific diagnostic doubts.
作者确定了磁共振血管造影研究颈部血管的标准投照体位。60名志愿者接受了颈部动脉血管的血管磁共振成像检查，并采用了在冠状面和矢状面上获取的FISP 3D FT序列。梯度回波序列（FISP 3D FT）的采集参数为TR = 0.04 - 0.08秒，TE = 15毫秒，翻转角为25度。采集容积中包含厚度为1 - 2毫米的单次激发层面。这些序列随后采用最大强度投影法进行处理。两名放射科医生检查了我们的结果，以选择最佳投照体位。我们使用了一种半定量量表，该量表使我们能够区分每个投照体位的3种不同诊断水平：血管显示良好、显示不佳和未显示。对于每个层面，轴向旋转角度从0度到180度，间隔为15度。在冠状面上，-45度到45度的旋转是显示所研究血管的最佳角度。0度 - 15度 - 30度 - 45度 - 135度 - 165度 - 180度的投照体位能够清晰显示颈总动脉和椎动脉。其他投照体位在诊断方面似乎并无用处。在矢状面上，60度到120度的旋转是最佳角度。90度投照体位能够显示颈部所有大的动脉血管，包括颈动脉分叉以及颈内和颈外动脉。评估颈部血管血管磁共振成像的最佳诊断投照体位有助于减少后处理时间。事实上，在检查过程中即时显示标准投照体位，如果需要，可以进一步采集图像，以试图解决特定的诊断疑问。
