Subtracted versus non-subtracted digital imaging in peripheral angiography

Area of Science:

• Vascular imaging
• Radiology
• Medical technology

Background:

• Digital subtraction angiography (DSA) is crucial for managing lower extremity vascular diseases.
• A limitation of DSA is the absence of an automatically moving tabletop.
• Advancements include large-screen intensifier systems and automated 'stepping' facilities.

Purpose of the Study:

• To evaluate the efficacy of digital peripheral arteriography (DA) with and without subtraction techniques.
• To compare the influence of different iodine concentrations in DA and DSA for lower extremity arteries.
• To assess the utility of an automated 'stepping' facility in peripheral angiography.

Main Methods:

• 1,024 x 1,024 matrix with a large-screen intensifier system and an automated 'stepping' facility were utilized.
• 161 examinations of lower extremity arteries were performed using both peripheral DA and DSA.
• Comparison of contrast medium iodine concentrations (300 mg I/ml) and their impact on image quality.

Main Results:

• Peripheral DA demonstrated comparable results to peripheral DSA in the pelvic, thigh, and knee regions.
• Adequate contrast was not achieved in approximately 45% of lower leg artery examinations with DA.
• An automated 'stepping' facility was found to reduce both contrast medium volume and exposure duration.

Conclusions:

• Peripheral DA is a viable alternative to DSA for imaging arteries in the pelvis, thigh, and knee.
• A contrast medium concentration of 300 mg I/ml is necessary for effective lower leg artery imaging.
• Automated 'stepping' facilities enhance efficiency by reducing contrast agent and radiation exposure.