Development and Validation of an X-ray Imaging Detector for Digital Radiography at Low Resolution

Abdiel Ramírez Reyes, Gerardo Herrera Corral, Elsa Ordoñez Casanova, Héctor Alejandro Trejo Mandujano, Uzziel Caldiño Herrera
2020 Journal of Nuclear Physics Material Sciences Radiation and Applications  
Digital X-ray detectors are required in different sciences and applications, however many high quality devices are expensive although high-resolution images are not always required. We present an easy way to build a detector capable of forming X-ray digital images and video with a very large area (18×18 cm2). The detector is formed by three main components: scintillator, optics lenses and CCD sensor. Basically, the device converts the X-rays into visible light which is then collected by the CCD
more » ... ollected by the CCD sensor. The scintillator is Gadox type, from Carestream®, 18×18 cm2, regular type, lambda 547 nm. The optics lenses are generic, with manual focus and widely visual field. The CCD sensor has a size of 1/3″, 752 × 582 pixels, monochrome, 20 FPS, 12 bits ADC and pixel size of 3.8 μm. With the built detector and an X-ray source, we formed an X-ray imaging detection system to generate digital radiographs of biological or inert objects-examples are given-, as well as real-time X-ray video. Additionally, the spatial resolution limit was measured in terms of Modulation Transfer Function by the method of opaque edge from a lead sheet with a result of 1.1 Lp/mm. Finally using a filter, the focal spot of the X-ray source is measured, resulting in a diameter of 0.9 mm (FWHM).
doi:10.15415/jnp.2020.72023 fatcat:i6du2cnhqfbgvhxohblf6tkwr4