Subtractionless first-pass single contrast medium dose peripheral MR angiography using two-point Dixon fat...

Area of Science:

• Radiology and Imaging
• Cardiovascular Imaging
• Medical Physics

Background:

• Magnetic resonance angiography (MRA) is vital for diagnosing peripheral arterial disease.
• Conventional MRA often requires contrast subtraction techniques, which can introduce artifacts and reduce image quality.
• Two-point Dixon fat suppression offers an alternative method for fat suppression in MRA.

Purpose of the Study:

• To evaluate the feasibility of subtractionless first-pass peripheral MRA at 1.5T using a single, low dose of contrast medium (0.1 mmol/kg).
• To compare the image quality of subtractionless MRA with conventional subtraction MRA.
• To assess the impact of two-point Dixon fat suppression on image quality in peripheral MRA.

Main Methods:

• A prospective study involving 28 patients with suspected peripheral arterial disease.
• Subtractionless and subtraction first-pass MRA were performed at 1.5T using two-point Dixon fat suppression.
• Image quality was assessed by comparing vessel-to-background contrast, signal-to-noise ratio (SNR) in a phantom study, and subjective scoring by two experienced observers.

Main Results:

• Subtractionless MRA demonstrated significantly improved vessel-to-background contrast across all evaluated anatomical locations (P < 0.001).
• Subjective image quality was consistently higher with the subtractionless technique compared to subtraction MRA (P < 0.03).
• The subtractionless method yielded a 15% higher SNR (31.9 vs 27.6) in phantom studies.

Conclusions:

• Subtractionless first-pass peripheral MRA at 1.5T is a feasible technique for evaluating lower extremity vasculature.
• This method, utilizing a single contrast medium dose and two-point Dixon fat suppression, provides superior objective and subjective image quality compared to conventional subtraction MRA.
• The subtractionless approach results in good image quality with a low rate of non-diagnostic studies, making it a valuable alternative for vascular imaging.