Development of an additional filtration system by 3D printing for the implementation of new X-ray beam qualities used in diagnostic radiology.

Abstract

The Calibration Laboratory (LCI) of the Nuclear and Energy Research Institute (IPEN-/CNEN) offerscalibration services for radiation measurements instruments used in radiation protection, diagnostic radiologyand radiotherapy. LCI produces radiation qualities and irradiation conditions which are in accordance with thenational and international standard requirements. In order to establish the recommended radiation qualities fordiagnostic radiology, X-ray beams generated in laboratory are modified for the irradiation conditions found inequipment routinely used in healthcare services. In this work, a new additional filtration system was developedto be adapted to the existing filter system at LCI. The new filter support can be coupled to the PTW BenchControl installed at the LCI X-ray system. Using a FDM 3D printer, a support model and a set of drawers weredeveloped for the placement of additional filters. The models were also developed to fit each specific drawer ofeach filter to be used in the laboratory routine, coupled to the specific sensors that fit the spaces of the supportpart. Additionally, a microcontroller based on Arduino, micro switches, low- and high-levelprogramming, allow checking of drawer status and integration of information with the laboratory controlsystem. The system allows the recognition of the filter inserted in the drawer from sensors attached to thesupport. Tests were carried out to verify the usability of the system in the routine, adding Ag (silver) and Cu(copper) filters, for the characterization of attenuated radiation beams of interest in diagnostic radiology.