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Determination of the surface dose of a water phantom using a semiconductor detector for diagnostic kilovoltage x-ray beams
| Content Provider | Scilit |
|---|---|
| Author | Tanabe, Ryuki Araki, Fujio |
| Copyright Year | 2021 |
| Description | Journal: Physica Medica Purpose To determine the surface dose of a water phantom using a semiconductor detector for diagnostic kilovoltage x-ray beams. Methods An AGMS-DM+ semiconductor detector was calibrated in terms of air kerma measured with an ionization chamber. Air kerma was measured for 20 x-ray beams with tube voltages of 50–140 kVp and a half-value layer (HVL) of 2.2–9.7 mm Al for given quality index (QI) values of 0.4, 0.5, and 0.6, and converted to the surface dose. Finally, the air kerma and HVL measured by the AGMS-DM+ detector were expressed as a ratio of the surface dose for 10 × 10 and 20 × 20 $cm^{2}$ fields. The ratio of both was represented as a function of HVL for the given QI values and verified by comparing it with that calculated using the Monte Carlo method. Results The air kerma calibration factor, CF, for the AGMS-DM+ detector ranged from 0.986 to 1.016 (0.9% in k = 1). The CF values were almost independent of the x-ray fluence spectra for the given QI values. The ratio of the surface dose to the air kerma determined by the PTW 30,013 chamber and the AGMS-DM+ detector was less than 1.8% for the values calculated using the Monte Carlo method, and showed a good correlation with the HVL for the given QI values. Conclusion It is possible to determine the surface dose of a water phantom from the air kerma and HVL measured by a semiconductor detector for given QI values. |
| Related Links | http://www.physicamedica.com/article/S1120179721001666/pdf |
| Ending Page | 204 |
| Page Count | 7 |
| Starting Page | 198 |
| ISSN | 11201797 |
| DOI | 10.1016/j.ejmp.2021.04.009 |
| Journal | Physica Medica |
| Volume Number | 84 |
| Language | English |
| Publisher | Elsevier BV |
| Publisher Date | 2021-04-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Physica Medica Radiology, Nuclear Medicine and Imaging Surface Dose Measurement Semiconductor Detector Diagnostic Kilovoltage X-ray Beams Quality Index |
| Content Type | Text |
| Resource Type | Article |
| Subject | Radiology, Nuclear Medicine and Imaging Physics and Astronomy Biophysics |
