低场强磁共振三维时飞法脑血流成像临床应用的初步报告（附52例分析）

A Preliminary Study of Clinical Application of Low Field MR 3DTOF Angiography (Analysis of 52 Cases)

作者收集了诊断明确的５２例颅内病变的低场ＭＲＡ资料进行分析，其中的２１例经Ｘ线脑血管造影检查；５２例均采用３ＤＴＯＦ法ＭＲＡ扫描；本组５２例中可１００％的显示Ｗｉｌｌｉｓ血管环及其附近４公分以内的血管段，额极动脉以前及侧裂动脉主干可清晰显示者达６９．２％（３２／５２）；５２例中３１例为脑血管疾病，诊断率为４８．４％（１５／３１），Ｘ线脑血管造影的诊断率为７６．２％（１６／２１）；由于低场强３ＤＴＯＦ法脑血流成像具有无创、无痛、安全、成像快捷等优点，所以可作为脑血管疾病的初查、筛选或作为不能接受ＤＳＡ检查的患者的诊断手段；作者还指出了与高场强ＭＲＡ相比低场强ＭＲＡ的不足之处。

We analyzed the low field MRA images of 52 cases of patients with definite intracranial in juries. Of these patients, 21 were examined by X-ray cerebral angiography. All patients were conducted with 3D TOF MRA scanning. The results were that 100% of the patients showed the willis arteries circle and the surronding blood vessel segments within 4 centimeters long. Frontal antinial arteries and the Sylvies arteries were seen clearly in 69.2% of the patients (32/52). Of the 52 patients, 31 suffered from cerebral vascular diseases. But the diagnostic rate of 3D TOF MRA was 48.4% (15/21), while the x-ray cerebral angiography was about 76.2% (16/21).The low field 3D TOF angiography is an examination of no damage, painless, safe and rapid imaging. It can be used as means of primary examination, screening of cerebral vascular diseases, or to diagnose patients who can not be examined by the DSA. Finally, we also discussed the weakness of low field MRA compared with the high field MRA.