Less invasive vascular imaging of the maxillofacial region

我们研究的目的是使用更少的侵袭性血管损伤技术。应用CT血管造影术和MR血管造影术对颌面部病变进行优化，确定最佳CT血管造影剂参数，并将其应用于23例颌面部病变。碘对比剂的注射速度以2ml/s为宜，高于此速度不能改善图像质量。CT血管成像对房室畸形的诊断非常有用，但对小血管的诊断价值有限。我们比较了相位对比和飞行时间技术的应用。前者能提供更大面积的血管图像，能更清晰地显示缓慢血流的静脉，优于后者。然而，它需要更长的解释时间，这降低了临床有效性。我们将这两种方法中的任何一种应用于15例面部最大病变。然而，与CT血管造影术类似，它对小血管的诊断价值被认为是有限的，这些小血管大多是缓慢血流的。另外，我们还评价了Gd增强三维磁共振血管成像在颌面部的应用价值。这种造影剂极大地提高了小血管的显示率的技术可能是提供颌面部区域血管线条的最佳方法。

The goal of our investlgation was to utmze less invaslve vascuiar irnaging techniques. CT anglography and MR angiography, for the dtagnosls of maxnlofactal region in the optimai methods.The optimal imaging parameters of CT anglography were defined and applied to 23 cases with maxillofacial lesions. The injection rate of iodine contrast media should be 2 ml/sec : faster rate than that did not improve the image quality, CT angiography was extremely useful for the cases of AV malformation, however, its value was considered limited for the diagnosis of small vessels.As to MR angiography, we compared the usefulness of phase contrast and time of flight technique . The former was superior to the latter in that it could provide the vascular images of larger area and visuanze veins of slow flow more clearly. However, it requlres much longer exanaination time, which reduced the clinical validitity. We applied either of these two methods to 15 cases with maximofacial lesions. However, similar to CT anglography, its diagnostic value for small vessels, most of which were of slow flow, was considered limited. On the other hand, we also evaiuated the usefulness of Gadolinium enhanced 3D MR angiography in maxillofacial region. This technique in which contrast media extremely improve the visuanzation of small vessels may be the most optimal one providiog vascular linages of maxillofactal reglon.