Designing phantom in-house for quick check computed radiography (CR) and digital radiography (DR) system

Abstract

Computed Radiography (CR) and Digital Radiography (DR) are digitalized radiography systems which have connection between image quality and dynamic-characteristic dose that quality control becomes important for a patient. Phantom quick check with CR and DR system are designed to observe parameter of image quality, spatial resolution, signal nose to ratio (SNR) and detectability. The preparation phantom was designed with acrylic 25 cm x 25 cm x 1 cm that has well objecs with the diameters from 5 mm to 25 mm and depth 1 mm to 8 mm also Aluminium with 15 mm x 15 mm and thickness of 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm. Radiation quality beam or RQA 5 has found to measurement standard in general radiography. The result is SNR graphic versus object for each depth and give information to select objects. From graphic, contrast linier object and detectability is selected for a phantom design. The image from quadrant I could be used to analyse linearity pixel value. Quadrant II could be used to analyse detectability object size. Quadrant III and IV could be used to analyse the resolution spatial. Meanwhile, the point object was used to evaluate the spatial resolution with MTF measurement and Line pair bar. Based on the conducted trial test on the in-house phantom and the image result from each quadrant, further study will be performed to ensure that this in-house phantom will be usable for quick check at hospitals.