Characteristics relevant to portal dosimetry of a cooled CCD camera-based EPID

Our EPIDs have recently been equipped with Peltier-cooled CCD cameras. The CCD cooling dramatically reduced deteriorating effects of radiation damage on image quality. Over more than 600 days of clinical operation, the radiation induced noise contribution has remained stable at a very low level (1 S...

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Bibliographic Details
Published inMedical physics (Lancaster) Vol. 31; no. 9; p. 2549
Main Authors Franken, E M, de Boer, J C J, Barnhoorn, J C, Heijmen, B J M
Format Journal Article
LanguageEnglish
Published United States 01.09.2004
Subjects
Cold Temperature
Equipment Failure Analysis
Radiographic Image Enhancement - instrumentation
Radiographic Image Enhancement - methods
Radiometry - instrumentation
Radiotherapy Dosage
Radiotherapy, Conformal - instrumentation
Reproducibility of Results
Sensitivity and Specificity
Signal Processing, Computer-Assisted - instrumentation
Video Recording - instrumentation
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Summary:Our EPIDs have recently been equipped with Peltier-cooled CCD cameras. The CCD cooling dramatically reduced deteriorating effects of radiation damage on image quality. Over more than 600 days of clinical operation, the radiation induced noise contribution has remained stable at a very low level (1 SD < or = 0.15% of the camera dynamic range), in marked contrast with the previously used noncooled cameras. The camera response (output signal versus incident EPID radiation exposure) can be accurately described with a quadratic function. This response reproduced well, both in short and long term (variation < 0.2% respectively < 0.4% (1 SD)), rendering the cooled camera well-suited for EPID dosimetry applications.
ISSN:0094-2405
DOI:10.1118/1.1785893