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Film dosimetry in conformal radiotherapy

Abstract

Dosimetry, through a film sandwiched in a transverse cross-section of a solid phantom, is a method of choice in Conformal Radiotherapy because: (a) the blackness (density) of the film at each point offers a measure of the total dose received at that point, and (b) the film is easily calibrated by exposing a film strip in the same cross-section, through a stationary field. The film must therefore have the following properties: (a) it must be slow, in order not to be overexposed, even at a therapeutic dose of 200 cGy, and (b) the response of the film (density versus dose curve) must be independent of the photon energy spectrum. A few slow films were compared. It was found that the Kodak X-Omat V for therapy verification was the best choice. To investigate whether the film response was independent of the photon energy, response curves for six depths, starting from the depth of maximum dose to the depth of 25 cm, in solid phantom were derived. The vertical beam was perpendicular to the anterior surface of the phantom, which was at the distance of 100 cm from the source and the field was 15x15 cm at that distance. This procedure was  More>>
Authors:
Danciu, C; Proimos, B S [1] 
  1. Patras Univ. (Greece). Dept. of Medical Physics
Publication Date:
Dec 01, 1995
Product Type:
Conference
Report Number:
INIS-BE-0001; CONF-951246-
Reference Number:
SCA: 550603; PA: AIX-28:034230; EDB-97:069765; SN: 97001774998
Resource Relation:
Conference: 11. annual symposium of the Belgian Association of Hospital Physicists: conformal radiotherapy - physics, treatment planning and verification, Ghent (Belgium), 8-9 Dec 1995; Other Information: PBD: Dec 1995; Related Information: Is Part Of Conformal Radiotherapy: Physics, Treatment Planning and Verification. Proceedings book; De Wagter, C. [ed.]; PB: 273 p.
Subject:
55 BIOLOGY AND MEDICINE, BASIC STUDIES; RADIOTHERAPY; BEAM OPTICS; BIOMEDICAL RADIOGRAPHY; COBALT 60; COLLIMATORS; CONFORMAL MAPPING; DELAYED RADIATION EFFECTS; DOSEMETERS; DOSIMETRY; IMAGE PROCESSING; IMAGE SCANNERS; IRRADIATION DEVICES; ISODOSE CURVES; LINEAR ACCELERATORS; NEOPLASMS; QUALITY ASSURANCE
OSTI ID:
464325
Research Organizations:
Ghent Rijksuniversiteit (Belgium). Kliniek voor Radiotherapie en Kerngeneeskunde
Country of Origin:
Belgium
Language:
English
Other Identifying Numbers:
Other: ON: DE97622340; TRN: BE9700030034230
Availability:
INIS; OSTI as DE97622340
Submitting Site:
BEN
Size:
pp. 179-192
Announcement Date:

Citation Formats

Danciu, C, and Proimos, B S. Film dosimetry in conformal radiotherapy. Belgium: N. p., 1995. Web.
Danciu, C, & Proimos, B S. Film dosimetry in conformal radiotherapy. Belgium.
Danciu, C, and Proimos, B S. 1995. "Film dosimetry in conformal radiotherapy." Belgium.
@misc{etde_464325,
title = {Film dosimetry in conformal radiotherapy}
author = {Danciu, C, and Proimos, B S}
abstractNote = {Dosimetry, through a film sandwiched in a transverse cross-section of a solid phantom, is a method of choice in Conformal Radiotherapy because: (a) the blackness (density) of the film at each point offers a measure of the total dose received at that point, and (b) the film is easily calibrated by exposing a film strip in the same cross-section, through a stationary field. The film must therefore have the following properties: (a) it must be slow, in order not to be overexposed, even at a therapeutic dose of 200 cGy, and (b) the response of the film (density versus dose curve) must be independent of the photon energy spectrum. A few slow films were compared. It was found that the Kodak X-Omat V for therapy verification was the best choice. To investigate whether the film response was independent of the photon energy, response curves for six depths, starting from the depth of maximum dose to the depth of 25 cm, in solid phantom were derived. The vertical beam was perpendicular to the anterior surface of the phantom, which was at the distance of 100 cm from the source and the field was 15x15 cm at that distance. This procedure was repeated for photon beams emitted by a Cobalt-60 unit, two 6 MV and 15 MV Linear Accelerators, as well as a 45 MV Betatron. For each of those four different beams the film response was the same for all six depths. The results, as shown in the diagrams, are very satisfactory. The response curve under a geometry similar to that actually applied, when the film is irradiated in a transverse cross-section of the phantom, was derived. The horizontal beam was almost parallel (angle of 85) to the plane of the film. The same was repeated with the central ray parallel to the film (angle 90) and at a distance of 1.5 cm from the horizontal film. The field size was again 15x15 at the lateral entrance surface of the beam. The response curves remained the same, as when the beam was perpendicular to the films.}
place = {Belgium}
year = {1995}
month = {Dec}
}