Digital variance angiography allows about 70% decrease of DSA-related radiation exposure in lower limb X-ray...

Area of Science:

• Radiology
• Medical Imaging
• Interventional Cardiology

Background:

• Digital Subtraction Angiography (DSA) is a standard imaging technique for lower limb angiography.
• Concerns exist regarding radiation exposure associated with DSA procedures.
• Digital Variance Angiography (DVA) has shown potential for improved contrast-to-noise ratio (CNR) and image quality.

Purpose of the Study:

• To evaluate if the enhanced image quality of DVA can reduce radiation exposure in lower limb X-ray angiography.
• To compare the CNR and visual quality of DVA and DSA at different radiation doses.
• To assess the non-inferiority of low-dose DVA compared to standard-dose DSA.

Main Methods:

• Prospective study involving 30 peripheral artery disease patients undergoing diagnostic angiography.
• Acquisition of images using both normal (1.2 µGy/frame) and low-dose (0.36 µGy/frame) protocols for DSA and DVA.
• Calculation of CNR and evaluation of visual quality by seven specialists using a 5-grade Likert scale.

Main Results:

• DVA demonstrated a two- to three-fold higher CNR and significantly better visual scores than DSA.
• Low-dose DVA (DVA30) was superior to normal-dose DSA (DSA100) in the crural region (p < 0.001).
• No significant difference was found between DVA30 and DSA100 in the femoral (p = 0.435) and abdominal (p = 0.350) regions.

Conclusions:

• DVA enables approximately a 70% reduction in radiation exposure for lower limb X-ray angiography.
• DVA offers a potential new tool for radiation protection for both patients and medical staff.
• The findings support the use of DVA as a lower-radiation alternative to DSA in specific anatomical regions.