Measurement of the half-value layer for CT systems in a single-rotation technique: Reduction of stray radiation with lead apertures

The half-value layer (HVL) is the thickness of a material that decreases the intensity of X-rays passing through it to half of their original air-kerma (K ̇air) value. It is used to reveal the characteristics of X-ray beams. Aluminum is the most commonly used material in filtering X-ray intensity because it is inexpensive and has useful absorption properties at diagnostic X-ray energies [1]. Although the US Food and Drug Administration regulations pr ovide a minimum aluminum HVL for radiographic and fluoroscopic systems [2], routine verification of the minimum HVL is not common in computed tomography (CT) systems [3].

Source: Physica Medica: European Journal of Medical Physics - July 24, 2020 Category: General Medicine Authors: Atsushi Fukuda, Nao Ichikawa, Masami Tashiro, Tensho Yamao, Katsuhiko Murakami, Hitoshi Kubo Tags: Original paper Source Type: research