RisoeScan - a new software for Dose Measurement · • a software package for image analysis of...
Transcript of RisoeScan - a new software for Dose Measurement · • a software package for image analysis of...
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RisoeScan is:
• a software package for image analysis of dosimeter films,
• used for analysis of images of any dosimeter that colours visibly,
• useful for depth dose curves and surface dose profiles,
• based on LabView programming language from National Instruments,
• utilizing scanned images from a flatbed scanner.
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Scanner properties
• A scanner is not a precision instrument– Only 255 grey-scale levels.– One scan may differ from the next due to
different lamp temperature, stability of electronics etc.
• Scans are not identical if the scanner settings are not kept constant.
• Different scanners will make different scans.
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B3 Film Reference Tablet• In order to correct for possible instabilities, a
reference is measured for each scan.
We use laminated B3 film dosimeters irradiatedto 12, 25 and 50 kGy as a reference.
• The reference links the calibration to the measurement of the unknown dosimeter.
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CalibrationThe reference is measured in the same scan as the calibration dosimeters.
Irradiateddosimeters
Reference
The green channel is selected for best S/N ratio. The image is presented in grey scale.
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Reference values are stored together with the calibration curve.
CalibrationCalibration curve is based on measurements of the individual dosimeter films.
A B C
Ref. name Ref. valuesA 98.89B 142.18C 184.30
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Measurement of dose
Typical correction: <1%Typical standard deviation on a reading: 1-2%
Reference values obtained during the calibration are compared with reference values obtained during measurement of unknown dosimeters.
Differences are used to correct the measured dose.
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Surface dose profile
Dose at centre of cross-hair
Option to find minimumand maximum dose
Dose alonghorizontalaxis
Dose alongvertical axis
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3D Surface dose profile
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Measurement of E-beam energy• Average and most probable electron energy are
calculated based on the descending slope of a depth dose profile.
• Calculation of R50 , Rex and EA and EP are based on user defined equations (ISO/ASTM).
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