Is half-dose contrast-enhanced three-dimensional MR angiography sufficient for the abdominal aorta and pelvis?

Area of Science:

• Radiology
• Medical Imaging
• Cardiovascular Imaging

Background:

• Magnetic resonance (MR) angiography is crucial for visualizing the abdominal aorta and its branches.
• Optimizing contrast agent dosage and injection rates can enhance imaging efficiency and patient safety.

Purpose of the Study:

• To assess the diagnostic utility of half-dose contrast-enhanced MR angiography for abdominal aorta and major branch depiction.
• To compare image quality and diagnostic performance between standard and reduced contrast doses.

Main Methods:

• 72 patients were randomized into four groups, varying contrast concentration, total dose, and injection rate (1 or 0.5 mL/second).
• Quantitative analysis of signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) was performed for the abdominal aorta and iliac arteries.
• Blinded readers assessed overall image quality.

Main Results:

• Lower SNR and CNR were observed in the 0.5 mL/second injection rate groups compared to the 1 mL/second groups.
• No statistically significant differences in overall image quality were found across the four experimental groups.
• Half-dose angiography with a 1 mL/second injection rate achieved comparable image clarity to a full dose.

Conclusions:

• Half-dose contrast-enhanced MR angiography, when injected at 1 mL/second with diluted contrast, provides diagnostic image quality for the abdominal aorta and its branches.
• This approach offers comparable visualization to a full single dose, suggesting potential for reduced contrast material usage.
• Further research may validate this optimized protocol for routine clinical application.