High-spatial-resolution lower extremity MR angiography at 3.0 T: contrast agent dose comparison study

Area of Science:

• Radiology
• Medical Imaging
• Vascular Imaging

Background:

• Magnetic resonance (MR) angiography is crucial for evaluating lower extremity vasculature.
• Optimizing contrast material dose is essential for cost-effectiveness and patient safety in MR angiography.
• 3.0 Tesla (T) MR systems offer potential for improved image quality but require dose optimization studies.

Purpose of the Study:

• To evaluate if reducing contrast material dose at 3.0 T maintains image quality for lower extremity MR angiography.
• To compare image quality metrics across different gadopentetate dimeglumine doses in 3.0 T MR angiography.

Main Methods:

• Forty-five patients underwent 3.0 T lower extremity MR angiography with varying gadopentetate dimeglumine doses (high, intermediate, low).
• Arterial segments (34) were assessed by two blinded radiologists for image quality, vessel definition, stenosis, and collateral vessels.
• Statistical analysis using generalized estimating equations compared image quality across dose groups.

Main Results:

• Over 99% of arterial segments were of diagnostic quality across all dose groups.
• The low-dose group showed significantly better vessel definition than high- and intermediate-dose groups.
• No significant differences were observed in collateral vessel visualization; venous contamination was lowest in the low-dose group.

Conclusions:

• Contrast material dose for 3.0 T lower extremity MR angiography can be significantly reduced without compromising image quality.
• Low-dose gadopentetate dimeglumine may offer superior vessel definition compared to higher doses at 3.0 T.
• These findings support dose reduction strategies for 3.0 T lower extremity MR angiography.