A study of GafChromic XR Type R film response with reflective-type densitometers and economical flatbed scanners.
The GafChromic XR Type R film is a relatively new product for recording high radiation dose in interventional radiological procedures. Means of measuring the film response were studied in this investigation. Two handheld reflective-type densitometers of different models were compared in the range of 0-8 Gy. They were found to be in excellent agreement. Five reflective flatbed scanners of different models were compared by a simple preliminary test. Their widely differed performances suggest the need of testing a scanner before using it for dosimetry measurement. A selected scanner was further tested for its ability to measure radiation in the range of 0-8 Gy and for the development of a scanning protocol. This experiment suggested the inclusion of a calibration pattern with known exposures and a black reference step in the scanning of a film in RGB mode. Then the red component of this image should be used for dosimetry computation. This method was compared to the use of a red acetate filter. The latter was demonstrated to be a possible alternative for measurement below 5 Gy and when there is no software ability to split an image into color components.
Thomas
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Department of Radiological Sciences, University of Oklahoma Health Science Center, 940 Stanton L. Young Boulevard, Biomedical Sciences Building-127, Oklahoma City 73190, USA. George-Thomas@ouhsc.edu
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Rabe
Frank
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D015502:Absorptiometry, Photon / Q000295:instrumentation* / Q000379:methods* / Q000592:standards; D002138:Calibration; D005373:Film Dosimetry / Q000295:instrumentation / Q000379:methods / Q000592:standards; D011829:Radiation Dosage; D014962:X-Ray Film / Q000592:standards*