Dose Reduction method based on geometric characteristics during abdominal angiography

Abstract

Background: To propose a technical radiation dose-reduction strategy by assessing the effects of dose reduction according to geometric characteristics during digital abdominal angiography.

Methods/Statistical analysis: A 3D angiography device and an anthropomorphic phantom were used. Fluoroscopy and digital subtraction angiography (DAS) were conducted by changing geometric characteristics including X-ray tube angulation, field of view, the distance of the tube and the table between the X-ray and the flat panel detectors. Measurements were taken five times, and the mean value was used for analysis.

Findings: The dose according to X-ray tube angulation was the lowest in the AP view, and as FOV was magnified, the AK value, which corresponded to the absorbed dose in the diagnostic radiation area, was increased. The dose increased for every 100 mm increase in the distance between the X-ray tube and flat panel detector, and with increasing distance between the tube and the table. Overall, as the geometric characteristics of the angiography device changed, the dose decreased. Therefore, a sufficient understanding of the effects of the geometric characteristic changes on radiation dose during examinations would help to reduce the dose in both patients and medical staff.

Improvements/Applications: Understanding the radiation dose-reduction’s effects according to changes in geometric characteristics and appropriate use of these changes can reduce the radiation exposure dose in patients and medical staff.