Non-contrast renal MRA using multi-shot gradient echo EPI at 3-T MRI

Area of Science:

• Radiology
• Medical Imaging
• Magnetic Resonance Imaging

Background:

• Non-contrast renal Magnetic Resonance Angiography (MRA) is crucial for evaluating renal vasculature.
• Conventional sequences can be limited by scan time and image quality.

Purpose of the Study:

• To assess the feasibility of using multi-shot gradient echo planar imaging (MSG-EPI) for non-contrast renal MRA.
• To compare MSG-EPI with balanced steady-state free precession (b-SSFP) on a 3-T MRI system.

Main Methods:

• Seventeen healthy volunteers underwent non-contrast renal MRA using both MSG-EPI and b-SSFP sequences.
• Image quality parameters (contrast, noise, sharpness, artifacts, overall quality) were assessed by two radiologists.
• Signal-to-noise ratio (SNR), contrast ratio (CR), and acquisition time were quantitatively compared.

Main Results:

• MSG-EPI demonstrated significantly higher SNR and CR compared to b-SSFP.
• Acquisition time was significantly shorter with MSG-EPI.
• MSG-EPI showed significant improvements in image contrast, noise, sharpness, and overall image quality.

Conclusions:

• MSG-EPI is a promising, fast imaging technique for unenhanced renal MRA.
• This sequence offers superior image quality over b-SSFP for non-contrast renal MRA.
• MSG-EPI can shorten scan times and enhance image quality in renal MRA on a 3-T MRI system.