Diode-based transmission detector for IMRT delivery monitoring: a validation study.
The purpose of this work was to evaluate the potential of a new transmission detector for real-time quality assurance of dynamic-MLC-based radiotherapy. The accuracy of detecting dose variation and static/dynamic MLC position deviations was measured, as well as the impact of the device on the radiation field (surface dose, transmission). Measured dose variations agreed with the known variations within 0.3%. The measurement of static and dynamic MLC position deviations matched the known deviations with high accuracy (0.7-1.2 mm). The absorption of the device was minimal (~ 1%). The increased surface dose was small (1%-9%) but, when added to existing collimator scatter effects could become significant at large field sizes (≥ 30 × 30 cm2). Overall the accuracy and speed of the device show good potential for real-time quality assurance.
Duke Scholars
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Related Subject Headings
- Surface Properties
- Scattering, Radiation
- Radiotherapy, Intensity-Modulated
- Radiotherapy Planning, Computer-Assisted
- Radiotherapy Dosage
- Quality Assurance, Health Care
- Photons
- Nuclear Medicine & Medical Imaging
- Humans
- 5105 Medical and biological physics
Citation
Published In
DOI
EISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Surface Properties
- Scattering, Radiation
- Radiotherapy, Intensity-Modulated
- Radiotherapy Planning, Computer-Assisted
- Radiotherapy Dosage
- Quality Assurance, Health Care
- Photons
- Nuclear Medicine & Medical Imaging
- Humans
- 5105 Medical and biological physics