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Phase-contrast MR angiography of peripheral arteries: technique and clinical application
1Institute of Clinical Radiology, Westfälische Wilhelms-Universität Münster, Albert-Schweitzer Strasse 33, D-48129 Münster, Germany.
Abstract:
This articles describes Phase-Contrast-MRA (PC-MRA) techniques and their current clinical applications for peripheral arteries based on more than 250 clinical MRA studies performed at two institutions. PC-MRA depends on phase shifts caused by blood flow and thus this technique permits the use of coronal or sagittal slice orientations with large FOV's along the direction of the vessel of interest. Clinical applications focus on patients with peripheral arterial occlusive disease (PAOD) describing the role and limitations of PC-MRA for the work-up of stenoses, occlusions, aneurysms, and postsurgical follow-up. Recommendations for clinical routine are provided. A combined MR angiographic approach with various MRA techniques depending on the vessel segment to be imaged, PC-flow velocity measurements, and high-resolution scans of the vessel wall may turn out to be diagnostically effective and provide a comprehensive test for PAOD within the near future.
Insights
Phase-Contrast MRA (PC-MRA) offers valuable insights into peripheral artery diseases like stenoses and occlusions. This technique aids in diagnosing peripheral arterial occlusive disease (PAOD) and evaluating post-surgical outcomes.
Area of Science:
- Medical Imaging
- Cardiovascular Radiology
- Vascular Imaging
Background:
- Peripheral arterial occlusive disease (PAOD) diagnosis relies on advanced imaging techniques.
- Phase-Contrast Magnetic Resonance Angiography (PC-MRA) utilizes blood flow-induced phase shifts for imaging.
- Current clinical applications of PC-MRA for peripheral arteries are based on extensive institutional studies.
Purpose of the Study:
- To describe Phase-Contrast MRA (PC-MRA) techniques for peripheral arteries.
- To review current clinical applications of PC-MRA in diagnosing PAOD.
- To provide recommendations for PC-MRA in clinical routine.
Main Methods:
- Analysis of over 250 clinical MRA studies from two institutions.
- Application of PC-MRA techniques leveraging blood flow phase shifts.
- Utilizing coronal or sagittal slice orientations with large fields of view (FOVs) along vessel direction.
Main Results:
- PC-MRA is effective for evaluating stenoses, occlusions, and aneurysms in PAOD patients.
- The technique is useful for postsurgical follow-up assessments.
- Limitations of PC-MRA in specific clinical scenarios were identified.
Conclusions:
- PC-MRA is a valuable tool for peripheral artery assessment in PAOD.
- A combined approach integrating PC-MRA, PC-flow velocity measurements, and vessel wall imaging shows promise.
- Comprehensive diagnostic testing for PAOD may be achieved through multimodal MRA techniques in the future.