采用四重反转恢复预饱和和 3D 平衡稳态自由进动成像的非对比 MR 血管造影术对腹盆动脉进行全面评估。

Noncontrast MR angiography for comprehensive assessment of abdominopelvic arteries using quadruple inversion-recovery preconditioning and 3D balanced steady-state free precession imaging.

机构信息

Department of Radiology, Center for Biomedical Imaging, New York University School of Medicine, New York, New York 10016, USA.

出版信息

J Magn Reson Imaging. 2011 Jun;33(6):1430-9. doi: 10.1002/jmri.22564.

PURPOSE

To develop a noncontrast magnetic resonance angiography (MRA) method for comprehensive evaluation of abdominopelvic arteries in a single 3D acquisition.

MATERIALS AND METHODS

A noncontrast MRA (NC MRA) pulse sequence was developed using four inversion-recovery (IR) pulses and 3D balanced steady-state free precession (b-SSFP) readout to provide arterial imaging from renal to external iliac arteries. Respiratory triggered, high spatial resolution (1.3 × 1.3 × 1.7 mm(3)) noncontrast angiograms were obtained in seven volunteers and ten patients referred for gadolinium-enhanced MRA (CE MRA). Images were assessed for diagnostic quality by two radiologists. Quantitative measurements of arterial signal contrast were also performed.

RESULTS

NC MRA imaging was successfully completed in all subjects in 7.0 ± 2.3 minutes. In controls, image quality of NC MRA averaged 2.79 ± 0.39 on a scale of 0-3, where 3 is maximum. Image quality of NC MRA (2.65 ± 0.41) was comparable to that of CE MRA (2.9 ± 0.32) in all patients. Contrast ratio measurements in patients demonstrated that NC MRA provides arterial contrast comparable to source CE MRA images with adequate venous and excellent background tissue suppression.

CONCLUSION

The proposed noncontrast MRA pulse sequence provides high-quality visualization of abdominopelvic arteries within clinically feasible scan times.

目的

开发一种非对比磁共振血管造影（MRA）方法，以便在单次 3D 采集时全面评估腹盆动脉。

材料与方法

使用四个反转恢复（IR）脉冲和 3D 平衡稳态自由进动（b-SSFP）读出开发了一种非对比 MRA（NC MRA）脉冲序列，以提供从肾动脉到髂外动脉的动脉成像。在 7 名志愿者和 10 名因钆增强 MRA（CE MRA）而转诊的患者中，进行了呼吸触发、高空间分辨率（1.3×1.3×1.7mm³）的非对比血管造影。两位放射科医生评估了图像的诊断质量。还进行了动脉信号对比度的定量测量。

结果

在所有受试者中，NC MRA 成像均在 7.0±2.3 分钟内成功完成。在对照组中，NC MRA 的图像质量平均为 0-3 分制的 2.79±0.39，其中 3 分为最高分。所有患者的 NC MRA（2.65±0.41）的图像质量与 CE MRA（2.9±0.32）相当。患者的对比比测量表明，NC MRA 提供的动脉对比度与源 CE MRA 图像相当，具有足够的静脉和出色的背景组织抑制。