title: MONTE CARLO STUDY OF THE CARDIAC ABSORBED DOSE DURING X-RAY EXAMINATION OF AN ADULT PATIENT.
abstract: The computational voxel phantom 'High-Definition Reference Korean-Man (HDRK-Man)' was implemented into the Monte Carlo transport toolkit Geant4. The voxel model, adjusted to the Reference Korean Man, is 171 cm in height and 68 kg in weight and composed of ∼30 million voxels whose size is 1.981 × 1.981 × 2.0854 mm3The Geant4 code is then utilised to compute the dose conversion coefficients (DCCs) expressed in absorbed dose per air kerma free in air for >30 tissues and organs, including almost all organs required in the new recommendation of the ICRP 103, due to a broad parallel beam of monoenergetic photons impinging in antero-postero direction with energy ranging from 10 to 150 keV. The computed DCCs of different organs are found to be in good agreement with data published using other simulation codes. Also, the influence of patient size on DCC values was investigated for a representative body size of the adult Korean patient population. The study was performed using five different sizes covering the range of 0.8-1.2 magnification order of the original HDRK-Man. It focussed on the computation of DCC for the human heart. Moreover, the provided DCCs were used to present an analytical parameterisation for the calculation of the cardiac absorbed dose for any arbitrary X-ray spectrum and for those patient sizes. Thus, the present work can be considered as an enhancement of the continuous studies performed by medical physicist as part of quality control tests and radiation protection dosimetry.
authors.affiliation: Department of Radiological Sciences, College of Applied Medical Sciences, King Saud University, PO Box 10219, Riyadh 11433, Kingdom of Saudi Arabia okadri@ksu.edu.sa.|National Center for Nuclear Sciences and Technologies, Tunis 2020, Tunisia.
authors.forename: O
authors.initials: O
authors.lastname: Kadri
authors.affiliation: Department of Physics, College of Sciences and Arts, University of Bisha, Bisha, Kingdom of Saudi Arabia.|Unité de Recherche de Physique Nucléaire et des Hautes Energies, Faculté des Sciences de Tunis, Université Tunis El-Manar, Tunis, Tunisia.
authors.forename: K
authors.initials: K
authors.lastname: Manai
authors.affiliation: Department of Radiological Sciences, College of Applied Medical Sciences, King Saud University, PO Box 10219, Riyadh 11433, Kingdom of Saudi Arabia.
authors.forename: A
authors.initials: A
authors.lastname: Alfuraih
mesh_terms: D000328:Adult; D003198:Computer Simulation; D016208:Databases, Factual; D004307:Dose-Response Relationship, Radiation; D006321:Heart / Q000528:radiation effects*; D006801:Humans; D008297:Male; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D017785:Photons; D011381:Programming Languages; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*; D056910:Republic of Korea; D012984:Software; D014018:Tissue Distribution; D014965:X-Rays