Generation of portal film charts for 10-MV x rays

Sergio Faermann; Yanai Krutman

doi:10.1118/1.596865

Generation of portal film charts for 10-MV x rays

Sergio Faermann, Yanai Krutman

Faculty of Health Sciences

Research output: Contribution to journal › Letter › peer-review

7 Scopus citations

Abstract

An analytical method to generate portal film charts for 10-MV photon beams, which takes into account the presence of the cassette front screen is presented. The selection of the best film-screen combination was based on the new AAPM recommendations for radiotherapy portal imaging [AAPM Rep. No. 24, AAPM Task Group No. 28 (1987)]: 2-g/cm-thick copper front screen and 0.4-g/cm-thick copper rear screen, and X-OMAT TL Kodak unwrapped film. Doses at the film position were measured as a function of patient thickness, field size, air gap, and the results compared well with the doses derived from the analytical method: within ±15%. An optical density of 1.6 was selected for construction of the portal film charts. The application of the method for routine treatment planning quality assurance allows a quick and precise determination of the best exposures to the portal films.

Original language	English
Pages (from-to)	351-353
Number of pages	3
Journal	Medical Physics
Volume	19
Issue number	2
DOIs	https://doi.org/10.1118/1.596865
State	Published - 1 Jan 1992

Keywords

metal screen
optical density
portal film

ASJC Scopus subject areas

Biophysics
Radiology Nuclear Medicine and imaging

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title = "Generation of portal film charts for 10-MV x rays",

abstract = "An analytical method to generate portal film charts for 10-MV photon beams, which takes into account the presence of the cassette front screen is presented. The selection of the best film-screen combination was based on the new AAPM recommendations for radiotherapy portal imaging [AAPM Rep. No. 24, AAPM Task Group No. 28 (1987)]: 2-g/cm-thick copper front screen and 0.4-g/cm-thick copper rear screen, and X-OMAT TL Kodak unwrapped film. Doses at the film position were measured as a function of patient thickness, field size, air gap, and the results compared well with the doses derived from the analytical method: within ±15%. An optical density of 1.6 was selected for construction of the portal film charts. The application of the method for routine treatment planning quality assurance allows a quick and precise determination of the best exposures to the portal films.",

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T1 - Generation of portal film charts for 10-MV x rays

AU - Faermann, Sergio

AU - Krutman, Yanai

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N2 - An analytical method to generate portal film charts for 10-MV photon beams, which takes into account the presence of the cassette front screen is presented. The selection of the best film-screen combination was based on the new AAPM recommendations for radiotherapy portal imaging [AAPM Rep. No. 24, AAPM Task Group No. 28 (1987)]: 2-g/cm-thick copper front screen and 0.4-g/cm-thick copper rear screen, and X-OMAT TL Kodak unwrapped film. Doses at the film position were measured as a function of patient thickness, field size, air gap, and the results compared well with the doses derived from the analytical method: within ±15%. An optical density of 1.6 was selected for construction of the portal film charts. The application of the method for routine treatment planning quality assurance allows a quick and precise determination of the best exposures to the portal films.

AB - An analytical method to generate portal film charts for 10-MV photon beams, which takes into account the presence of the cassette front screen is presented. The selection of the best film-screen combination was based on the new AAPM recommendations for radiotherapy portal imaging [AAPM Rep. No. 24, AAPM Task Group No. 28 (1987)]: 2-g/cm-thick copper front screen and 0.4-g/cm-thick copper rear screen, and X-OMAT TL Kodak unwrapped film. Doses at the film position were measured as a function of patient thickness, field size, air gap, and the results compared well with the doses derived from the analytical method: within ±15%. An optical density of 1.6 was selected for construction of the portal film charts. The application of the method for routine treatment planning quality assurance allows a quick and precise determination of the best exposures to the portal films.

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Generation of portal film charts for 10-MV x rays

Abstract

Keywords

ASJC Scopus subject areas

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