PMID: 9651041Jul 3, 1998Paper

Characteristics of a commercially available film digitizer and their significance for film dosimetry

Physics in Medicine and Biology
B Mersseman, Carlos De Wagter

Abstract

Dosimetric detectors used in high-energy photon radiation dosimetry mainly perform a zero- or one-dimensional measurement. These low-dimensional methods are not always adequate in the context of conformal radiotherapy. Therefore, two-dimensional film dosimetry has attracted attention. We studied a 12-bit CCD-based film digitizer (Vidar VXR-12) with regard to accurate film dosimetry. We investigated the stability, linearity, noise, effects of aberrant light scatter and built-in conversion tables. A digitizing resolution of 75 dpi and a digitizing speed of 20 ms/line result in an optimal signal-to-noise ratio. At optical densities above 2.0, the reading accuracy of the digitizer is limited by noise. The results of various experiments prove both the capabilities and limitations of the digitizer studied. We also propose a method to acquire and process film data using such a digitizer.

References

Jan 1, 1990·International Journal of Radiation Oncology, Biology, Physics·L J van Battum, H Huizenga
May 1, 1995·Medical Physics·R J MeederP Munro
May 1, 1994·Physics in Medicine and Biology·W DölerR Vosshenrich

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Citations

Jan 22, 2000·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Y De DeeneW De Neve
Oct 7, 2004·Australasian Physical & Engineering Sciences in Medicine·P K N YuM J Butson
Nov 6, 2002·Australasian Physical & Engineering Sciences in Medicine·Y WangW Zealey
May 23, 2002·International Journal of Radiation Oncology, Biology, Physics·Daniel A LowJames A Purdy
Aug 16, 2005·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Sofie GillisBen J Mijnheer
Jul 28, 2007·Medical Physics·Sujatha PaiUNKNOWN American Association of Physics in Medicine
Sep 12, 2006·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Angelo F Monti, Giovanna Frigerio
Oct 1, 2003·Physics in Medicine and Biology·Martin J ButsonTsang Cheung
Aug 8, 2002·Physics in Medicine and Biology·C MartensW De Neve
Dec 22, 2006·Physics in Medicine and Biology·L PaelinckC De Wagter
Jul 20, 2007·Physics in Medicine and Biology·Antonio González-López
Aug 1, 2007·Physics in Medicine and Biology·Martina FussDietmar Georg
Sep 21, 2007·Physics in Medicine and Biology·R P Srivastava, C De Wagter
Apr 9, 2005·Physics in Medicine and Biology·S Gillis, C De Wagter
Apr 28, 2001·Physics in Medicine and Biology·C MartensW De Neve
Nov 16, 2002·Physics in Medicine and Biology·Tsang CheungPeter Metcalfe
Jan 9, 2003·Nihon Hoshasen Gijutsu Gakkai zasshi·Takeo NakashimaMasanori Miyazawa
Jan 27, 2009·Physics in Medicine and Biology·B C FerreiraM Capela
Aug 22, 2001·Physics in Medicine and Biology·T CheungP K Yu

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