title: A simple method of producing depth ionization data for electron energy constancy check.
abstract: A simple method has been developed to reproduce depth ionization data of electron beams for energy determination. The method utilizes a simple set of equipment, a combination of a specially designed wedge-shaped polystyrene phantom and a linear array of detectors, to collect the necessary data. The wedge-shaped phantom provides varying depths to various detectors in the array. The ionization readings received from the detectors were corrected for off-axis ratio and plotted against corresponding ray-line depths to produce depth ionization curves. The instrument setup was fast and simple. The relevant data, for a high-energy linear accelerator with multiple electron energies, were collected in minutes. The depths of 80% and 50% ionization determined by this method were found to differ by 2 and 3 mm, respectively, at the most, with those determined by a conventional method.
authors.affiliation: Department of Clinical Physics, Princess Margaret Hospital, Toronto, Canada.
authors.forename: M K
authors.initials: MK
authors.lastname: Islam
authors.forename: H
authors.initials: H
authors.lastname: Rashid
authors.forename: H
authors.initials: H
authors.lastname: Gaballa
authors.forename: J
authors.initials: J
authors.lastname: Ting
authors.forename: U F
authors.initials: UF
authors.lastname: Rosenow
mesh_terms: D055592:Biophysical Phenomena; D001703:Biophysics; D004583:Electrons; D005069:Evaluation Studies as Topic; D006801:Humans; D008961:Models, Structural; D011786:Quality Control; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy / Q000592:standards* / Q000706:statistics & numerical data