PMID: 11324956Apr 28, 2001Paper

The value of the LA48 linear ion chamber array for characterization of intensity-modulated beams

Physics in Medicine and Biology
C MartensW De Neve

Abstract

In this paper the performance of the LA48 linear ion chamber array (PTW, Freiburg, Germany) for characterization of intensity-modulated (IM) beams was investigated. First, some elementary properties were explored. A series of beam penumbras and output factors for small rectangular fields were measured at 6 and 18 MV, and the results were compared with data obtained using a diamond detector. The energy and dose rate dependence of the array response were examined, and the leakage current was assessed. In a second step, profiles were measured for two clinically delivered IM beams and for a dynamic wedge. The interplay between the sharpening of the penumbra by the upper metal electrode plate of the array and the volume averaging of the 4 x 4 mm ion chamber elements results in precise measurements, even in regions of high dose gradient. It is true, however, that the metal electrodes imply a small energy spectrum dependence in the array response. The dose rate dependence is found to be negligible. All of this makes, the LA48 linear array a suitable device for analysing dose distributions of clinical IM beams.

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Citations

Aug 10, 2013·Medical Physics·B PoppeK Willborn
Jul 12, 2011·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·S A SyamkumarVivekanandan Nagarajan
Jun 15, 2007·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·S CillaA Piermattei
Jan 24, 2015·Neurobiology of Learning and Memory·Philip A VieiraEdward Korzus
Jul 3, 2016·Medical Physics·L Brualla-GonzálezJ Pardo-Montero
May 30, 2007·Journal of Applied Clinical Medical Physics·Savino CillaAngelo Piermattei
Aug 8, 2002·Physics in Medicine and Biology·C MartensW De Neve
Feb 1, 2007·Physics in Medicine and Biology·J HerzenR Schmidt
Sep 24, 2005·Physics in Medicine and Biology·E SpeziA Ferri
Jul 2, 2010·Journal of Applied Clinical Medical Physics·Sathiyan SaminathanSanjay S Supe
May 3, 2014·Physics in Medicine and Biology·F GómezJ Pardo-Montero
Jun 29, 2016·Physics in Medicine and Biology·Tomas KronPeter B Greer

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