Digital Radiography of the Skeleton Using a Large-Area Detector Based on Amorphous Silicon Technology: Image Quality and Potential for Dose Reduction in Comparison with Screen-Film Radiography
| Autor: | M. Strotzer, C. Manke, M. F. Reiser, Johann Link, N. Holzknecht, Stefan Feuerbach, J. Gmeinwieser, Markus Völk, Markus Lenhart |
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| Rok vydání: | 2000 |
| Předmět: |
Male
Silicon Pixel Image quality business.industry Radiography Detector General Medicine Middle Aged Radiation Dosage Confidence interval Radiographic Image Enhancement Fractures Bone Digital image Humans Medicine Female Radiology Nuclear Medicine and imaging Prospective Studies Bone Diseases business Nuclear medicine Aged Digital radiography |
| Zdroj: | Clinical Radiology. 55:615-621 |
| ISSN: | 0009-9260 |
| DOI: | 10.1053/crad.2000.0493 |
| Popis: | AIM: The purpose of this study was to evaluate a large-area, flat-panel X-ray detector (FD), based on caesium-iodide (CsI) and amorphous silicon (a-Si) with respect to skeletal radiography. Conventional images were compared with digital radiographs using identical and reduced radiation doses. MATERIALS AND METHODS: Thirty consecutive patients were studied prospectively using conventional screen-film radiography (SFR; detector dose 2.5μGy). Digital images were taken from the same patients with detector doses of 2.5, 1.25 and 0.625μGy, respectively. The active-matrix detector had a panel size of 43×43cm, a matrix of 3×3K, and a pixel size of 143μm. All hard copies were presented in a random order to eight independent observers, who rated image quality according to subjective quality criteria. Results were assessed for significance using the Student's t -test (confidence level 95%). RESULTS: A statistically significant preference for digital over conventional images was revealed for all quality criteria, except for over-exposure (detector dose 2.5μGy). Digital images with a 50% dose showed a small, statistically not significant, inferiority compared with SFR. The FD-technique was significantly inferior to SFR at 75% dose reduction regarding bone cortex and trabecula, contrast and overall impression. No statistically significant differences were found with regard to over- and under-exposure and soft tissue presentation. CONCLUSION: Amorphous silicon-based digital radiography yields good image quality. The potential for dose reduction depends on the clinical query.Volk, M. (2000). Clinical Radiology 55, 615–621. |
| Databáze: | OpenAIRE |
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