Relative response of dosimeters to variations in scattered X-ray energy spectra encountered in interventional radiology
| Autor: | Jackie McCavana, Maeve Masterson, Julie Lucey, Nina McWilliams, Seán Cournane, Dani Maguire |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Biophysics General Physics and Astronomy Radiology Interventional Photon energy Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences Kerma 0302 clinical medicine Optics Lens Crystalline medicine Scattering Radiation Dosimetry Fluoroscopy Radiology Nuclear Medicine and imaging Radiometry Dosimeter medicine.diagnostic_test business.industry Equivalent dose X-Rays X-ray General Medicine 030220 oncology & carcinogenesis business |
| Zdroj: | Physica Medica. 67:141-147 |
| ISSN: | 1120-1797 |
| DOI: | 10.1016/j.ejmp.2019.11.002 |
| Popis: | Purpose The new lower eye lens dose limit is of relevance in interventional radiology, where higher dose procedures result in increased scattered radiation to staff. The eye lens dose may be monitored using the directional dose equivalent at 3 mm depth, Hp(3), or through Hp(10) or Hp(0.07) measurements and using conversion factors. However, there are a considerable range of factors which contribute to measurement uncertainties, one of which is the incident photon energy. This study investigated the energy spectra of scattered radiation in interventional radiology, and the dosimetry accuracy of dosimeter types, evaluating their energy dependence. Methods Scatter X-ray energy spectra were recorded under varied conditions in a fluoroscopy imaging suite. Dosimetry accuracy of eye dosimeters, including TLDs (100 s, 100Hs), Landauer Hp(3), John Caunt ED3 and Electronic Personal dosimeters (EPDs) were compared to air kerma measurements across a range of tube voltages. Results The variation of energy spectra with changing phantom thickness, spectrometer angulation and filtration are presented. The 100 and 100H TLDs, and EPDs showed a consistent air kerma response (within 10%) with changes in energy. The real-time silicon diode detectors showed a variable over response of between 10 and 25% across the energies investigated while Landauers dedicated Hp(3) eye dosimeters showed considerable variation between dosimeters for similar conditions, a 17% variation at 50 kVp. Conclusion The work aimed to validate the scattered energy spectra typically encountered in interventional radiology and to further determine the accuracy of eye dosimeters in relation to energy response variations. |
| Databáze: | OpenAIRE |
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