Dosimetric evaluation of a 2D pixel ionization chamber for implementation in clinical routine.

Abstract:

:In this paper we present the results of a dosimetric evaluation of a 2D ionization chamber array with the objective of its implementation for quality assurance in clinical routine. The pixel ionization chamber MatriXX (Scanditronix Wellhofer, Germany) consists of 32x32 chambers with a distance of 7.6 mm between chamber centres. The effective depth of measurement under the surface of the detector was determined. The dose and energy dependence, the behaviour of the device during its initial phase and its time stability as well as the lateral response of a single chamber of the detector in cross-plane and diagonal directions were analysed. It could be shown, that the detector's response is linear with dose and energy independent. Taking the lateral response into account, two different dose profiles, for a pyramidal and an IMRT dose distribution, were applied to compare the data generated by a treatment planning system with measurements. From these investigations it can be concluded that the detector is a suitable device for quality assurance and 2D dose verifications.

journal_name

Phys Med Biol

authors

Herzen J,Todorovic M,Cremers F,Platz V,Albers D,Bartels A,Schmidt R

doi

10.1088/0031-9155/52/4/023

subject

Has Abstract

pub_date

2007-02-21 00:00:00

pages

1197-208

issue

4

eissn

0031-9155

issn

1361-6560

pii

S0031-9155(07)32387-7

journal_volume

52

pub_type

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