title: Dose evaluation of selective collimation effect in cephalography by measurement and Monte Carlo simulation.
abstract: Recently, simulations based on the Monte Carlo code have been increasingly applied for physics phenomena, patient dose and quality assurance of radiation systems. The objective of this study was to use Monte Carlo simulation and measurement to verify dose and dose reduction in cephalography. The collimator was constructed with 3-mm thick lead plate, and attached to the tube head to remove regions of disinterest in the radiation field. A digital phantom patient was constructed to evaluate patient dose. In addition, detectors of pixel size 1×1 cm² and 0.1×0.1 cm² were constructed to check collimator location. The effective dose according to International Commission on Radiological Protection 103 was calculated with and without collimation. The effective doses for simulation with and without collimation were 5.09 and 11.32 µSv, respectively. The results of the calculated effective dose show 61.7 % reduction of field area and 55 % of effective dose. The Monte Carlo simulation is a good evaluation tool for patient dose.
authors.affiliation: Department of Radiologic Science, College of Health Science,  Korea University, Seoul,  Korea.
authors.forename: Boram
authors.initials: B
authors.lastname: Lee
authors.forename: Gwisoon
authors.initials: G
authors.lastname: Shin
authors.forename: Sunjung
authors.initials: S
authors.lastname: Kang
authors.forename: Boram
authors.initials: B
authors.lastname: Shin
authors.forename: Ilhong
authors.initials: I
authors.lastname: Back
authors.forename: Hyok
authors.initials: H
authors.lastname: Park
authors.forename: Changseo
authors.initials: C
authors.lastname: Park
authors.forename: Jeongwoo
authors.initials: J
authors.lastname: Lee
authors.forename: Wonho
authors.initials: W
authors.lastname: Lee
authors.forename: Jonghak
authors.initials: J
authors.lastname: Choi
authors.forename: Ryeonghwang
authors.initials: R
authors.lastname: Park
authors.forename: Youhyun
authors.initials: Y
authors.lastname: Kim
mesh_terms: D001822:Body Burden; D002508:Cephalometry; D003198:Computer Simulation; D006801:Humans; D008954:Models, Biological; D015233:Models, Statistical; D009010:Monte Carlo Method; D011829:Radiation Dosage; D011861:Radiography, Dental; D011874:Radiometry / Q000379:methods*; D012542:Scattering, Radiation; D014965:X-Rays