使用断层插值技术的高分辨率磁共振血管造影术评估脑动脉瘤：与数字减影血管造影术的相关性
Evaluation of cerebral aneurysms with high-resolution MR angiography using a section-interpolation technique: correlation with digital subtraction angiography.
作者信息
Chung T S, Joo J Y, Lee S K, Chien D, Laub G
机构信息
Department of Diagnostic Radiology, Yong Dong Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea.
出版信息
AJNR Am J Neuroradiol. 1999 Feb;20(2):229-35.
BACKGROUND AND PURPOSE
The objective was to evaluate the results of high-resolution, fast-speed, section-interpolation MR angiography and digital subtraction angiography (DSA), thereby examining the potential use of a primary noninvasive screening test for intracranial aneurysms.
METHODS
The images were obtained in 39 cerebral aneurysmal lesions from 30 patients with a time-of-flight MR angiographic technique using a 1.5-T superconducting MR system. The total image volume was divided into four slabs, with 48 partitions each. To save time, only 24 phase-encoded steps were measured and interpolated to 48. The parameters used included 30/6.4 (TR/TE), a flip angle of 25 degrees , a 160x512 matrix, a field of view of 150x200, 7 minutes 42 seconds of scan time, an effective thickness of 0.7 mm, and an entire thickness of 102.2 mm. Maximum intensity projection was used for the image analysis, and a multiplanar reconstruction technique was used for patients with intracranial aneurysms.
RESULTS
Among 39 intracranial aneurysmal lesions in 30 patients, 21 were ruptured and 18 were unruptured. Twelve lesions were less than 2 mm in size, 12 were 3 to 5 mm, 12 were 6 to 9 mm, and three were larger than 10 mm. At initial examinations, 38 of 39 aneurysmal lesions were detected by both MR angiography and DSA, with 97% sensitivity. In confirming aneurysms in neck and parent vessels, multiplanar reconstruction was successful in detecting all 39 aneurysms, whereas MR angiography was successful in detecting 27 (69%) and DSA was successful in detecting 32 (82%) of the lesions.
CONCLUSION
High-resolution MR angiography with a section-interpolation technique showed equal results to those of DSA for the detection of intracranial aneurysms and may be used as a primary noninvasive screening test. In the evaluation of aneurysms in neck and parent vessels, the concurrent use of MR angiography and multiplanar reconstruction was far superior to the use of either MR angiography or DSA alone.
背景与目的
本研究旨在评估高分辨率、快速、断层插值磁共振血管造影（MR angiography）和数字减影血管造影（DSA）的结果，从而探讨将其作为颅内动脉瘤初步无创筛查试验的潜在用途。
方法
使用1.5-T超导磁共振系统，采用飞行时间磁共振血管造影技术，对30例患者的39个脑动脉瘤病变进行成像。总图像体积被分为四个层面，每个层面有48个分区。为节省时间，仅测量24个相位编码步长并插值到48个。所使用的参数包括30/6.4（TR/TE）、25度翻转角、160x512矩阵、150x200视野、7分42秒扫描时间、0.7毫米有效层厚和102.2毫米总层厚。采用最大强度投影进行图像分析，对颅内动脉瘤患者使用多平面重建技术。
结果
在30例患者的39个颅内动脉瘤病变中，21个为破裂动脉瘤，18个为未破裂动脉瘤。12个病变小于2毫米，12个为3至5毫米，12个为6至9毫米，3个大于10毫米。在初次检查时，39个动脉瘤病变中的38个通过磁共振血管造影和DSA均被检测到，灵敏度为97%。在确认动脉瘤颈部和供血血管时，多平面重建成功检测到所有39个动脉瘤，而磁共振血管造影成功检测到27个（69%），DSA成功检测到32个（82%）病变。
结论
采用断层插值技术的高分辨率磁共振血管造影在检测颅内动脉瘤方面与DSA结果相当，可作为初步无创筛查试验。在评估动脉瘤颈部和供血血管时，同时使用磁共振血管造影和多平面重建远远优于单独使用磁共振血管造影或DSA。
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