Dependence of low contrast detail on exposure dose and tube voltage in digital flat-panel detector radiography—a pre-clinical phantom study
| Autor: | Stefan Wirth, B. Hoberg, Susan Notohamiprodjo, Karla Maria Treitl, F Mück, F. Wanninger, Daniel Maxien, L. Verstreepen, K M Röper |
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| Rok vydání: | 2018 |
| Předmět: |
Spectrum analyzer
Materials science business.industry Radiography Detector Flat panel detector Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Low contrast 030220 oncology & carcinogenesis business Nuclear medicine General Nursing Voltage Digital radiography |
| Zdroj: | Biomedical Physics & Engineering Express. 4:025010 |
| ISSN: | 2057-1976 |
| DOI: | 10.1088/2057-1976/aa9b8a |
| Popis: | Purpose. Pre-clinical determination of reasonable simplified examination protocols before clinical application to assess the performance of a direct digital radiography (DDR) system. Material and methods. The experimental setup consists of a DDR system with fixed flat-panel detector (CsI). A phantom with low-contrast structures (LCS) was examined in two settings in order to simulate standard radiographs: (1) small peripheral joints like the wrist (no patient phantom, no anti-scatter grid) and (2) big proximal joints like the hip (20 cm water tank patient simulation and with an anti-scatter grid). Setup (1) was manually exposed at 55 kV/2 mAs, 60 k V/1.6 mAs and 65 k V/1.25 mAs. Setup (2) was automatically exposed at 1.6, 2.5, 4 and 6 μGy per kV-setting (80 ± 5 kV). Contrast-detail curves (CDC) were generated by analyzer software. Results. Exposures of setup (1) showed similar CDC (p = 0.99) with a decreasing curve with larger diameter of LCS. In all exposures of setup (2) CDC were similar for all kV-settings (p > 0.93) with a decreasing curve with larger LCS diameter. CDC insignificantly decrease with increasing exposure dose (p > 0.38). Conclusion. Low-contrast detectability was independent of kV and marginally dependent on the dose, both within a certain range. This could be used to further reduce radiation dose and simplify examination protocols to be tested in a further clinical study. |
| Databáze: | OpenAIRE |
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