Title: Design of band-pass filters by experimental and simulation methods at the range of 100-125 keV of X-ray in fluoroscopy

Authors: Goli Khaleghi; Jamshid Soltani-Nabipour; Abdollah Khorshidi; Fariba Taheri

Addresses: Medical Radiation Engineering Department, Islamic Azad University, Parand Branch, P.O. Box 3761396361, Tehran, Parand, Iran ' Medical Radiation Engineering Department, Islamic Azad University, Parand Branch, P.O. Box 3761396361, Tehran, Parand, Iran ' School of Paramedical, Gerash University of Medical Sciences, P.O. Box 7441758666, Gerash, Iran ' Department of Physics, Faculty of Science, Zanjan University, P.O. Box 4537138791, Zanjan, Iran

Abstract: The determination of filters that remove low-energy and attenuate high-energy spectra does not essentially influence image quality, so it can reduce the absorbed patient dose. This work examines the impacts of thickness and filter material on contrast, resolution, absorbed patient dose and image quality. Based on the attenuation curves of elements and taking into account the cost-effectiveness and availability factors, four elements including tin, tungsten, lead and copper in different thicknesses was studied at the range of 100-125 keV. The simulations were executed using MCNPX code with an error less than 1% that represented the accuracy. Experimental data were obtained based on the results of calculations and simulations using fluoroscopy equipment. The results showed that applying the filters caused improving the resolution and image quality, and also remarkable reduction in output dose rate. In conclusion, the 0.1 mm thick lead element was taken as the most appropriate element in filtration.

Keywords: fluoroscopy; alpha phantom; band-pass filter; filter thickness; absorption edge; resolution; dose rate; attenuation curve; output intensity ratio; Monte Carlo N-particle - MCNP code.

DOI: 10.1504/IJBET.2022.123151

International Journal of Biomedical Engineering and Technology, 2022 Vol.38 No.4, pp.361 - 378

Received: 03 Dec 2018
Accepted: 04 Mar 2019
Published online: 01 Jun 2022 *

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