Effect of shape of automatic dose rate control and wedge compensation filter on radiation dose in an angiography system with a flat-panel detector

AbstractThe purpose was to investigate air-kerma area product (PKA) and entrance surface air-kerma rate (\(\dot{K}\)a,e) on the effect of the shape of automatic dose rate control (ADRC) in the presence of a wedge compensation filter. We compared and evaluated the variability of the X-ray output using a combination of wedge compensation filters and the ADRC. Two ADRC shapes (round and square) and three poly-methyl-methacrylate thicknesses (15, 20, and 25  cm) were used. A wedge compensation filter was inserted 2 cm at a time, up to 6 cm. When the wedge compensation filter was inserted to 6 cm for 20 cm of poly-methyl-methacrylate, the X-ray output fluctuated significantly. The PKA was reduced by 39% when the wedge compensation filter was inserted to 6 cm and by 59% when it was inserted to 4  cm under round-type for 20 cm poly-methyl-methacrylate. The shape of the ADRC affects\(\dot{K}\)a,e and PKA.

Source: Radiological Physics and Technology - September 21, 2023 Category: Physics Source Type: research