Intraarterial contrast-enhanced MR aortography with and without parallel acquisition technique in patients with
Silke Potthast1, Georg M Bongartz, Rolf Huegli
1Institute of Diagnostic Radiology, University Hospital Basel, Petersgraben 4, 4031 Basel, Switzerland. spotthast@uhbs.ch
Objective:
Repeated intraarterial gadolinium injections are necessary in endovascular MRI-guided interventions; therefore a low-dose protocol with a short acquisition time is preferable. The purpose of this study was to conduct a quantitative comparison of intraarterial MR aortograms obtained with and without high-speed parallel acquisition technique.
Subjects And Methods:
Intraarterial MR aortography was performed at 1.5 T on nine patients with peripheral arterial occlusive disease and in an aortic phantom with pulsatile flow. A 3D fast low-angle shot MRI sequence was used for standard technique (acquisition time, 20 seconds) and for parallel acquisition technique (acquisition time, 14 seconds). In all patients, a pigtail catheter was left in the suprarenal position after digital subtraction angiography. Contrast-enhanced intraarterial MR aortography was performed after automated injection of 50 mmol/L gadoterate dimeglumine at an injection rate of 4 mL/s. Contrast-to-noise ratio (CNR) and image quality were evaluated in both imaging series at different locations. In an aortic phantom with pulsatile flow, CNR was determined 1, 30, and 60 cm distal to the catheter tip with standard and parallel acquisition techniques.
Results:
In all patients, intraarterial MR aortography was feasible with both acquisition techniques. No significant difference in CNR or image quality was observed in the patient study. Similar results were calculated for the pulsatile aortic flow phantom at all locations.
Conclusion:
Intraarterial MR aortography is feasible with parallel acquisition technique without a significant loss of CNR. This technique reduces contrast agent consumption approximately 30% owing to an approximately 30% reduction in acquisition time.
Insights
High-speed parallel acquisition in MR aortography allows for faster imaging and reduced contrast agent use. This technique is feasible without compromising image quality or contrast-to-noise ratio in endovascular interventions.
Area of Science:
- Medical Imaging
- Radiology
- Cardiovascular Imaging
Background:
- Endovascular MRI-guided interventions require repeated intraarterial gadolinium injections.
- Optimizing protocols for lower contrast doses and shorter acquisition times is crucial.
Purpose of the Study:
- To quantitatively compare intraarterial MR aortograms acquired with and without high-speed parallel acquisition technique.
- To evaluate the feasibility and efficacy of parallel acquisition for reducing contrast agent consumption.
Main Methods:
- Intraarterial MR aortography performed at 1.5 T in nine patients and an aortic phantom.
- Comparison of standard (20s) and parallel acquisition (14s) techniques using a 3D fast low-angle shot sequence.
- Evaluation of contrast-to-noise ratio (CNR) and image quality in both techniques.
Main Results:
- Intraarterial MR aortography was feasible using both standard and parallel acquisition techniques.
- No significant difference in CNR or image quality was observed between the two techniques in patients or the phantom study.
- Parallel acquisition demonstrated similar performance to the standard technique.
Conclusions:
- Parallel acquisition technique is feasible for intraarterial MR aortography.
- This technique achieves reduced acquisition time without significant loss of CNR.
- It offers potential for approximately 30% reduction in contrast agent consumption.
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