Flat-Panel X-ray Detector Based on Amorphous Silicon versus Asymmetric Screen-Film System: Phantom Study of Dose Reduction and Depiction of Simulated Findings
| Autor: | Robert C. Gibbs, Friedrich W. Roehl, Ulrike Rapp-Bernhardt, Ulrich W. Krause, Thomas M. Bernhardt, Hagen Schmidl |
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| Rok vydání: | 2003 |
| Předmět: |
Amorphous silicon
Silicon Phantoms Imaging business.industry Detector X-ray X-ray detector chemistry.chemical_element Radiation Dosage Flat panel detector Imaging phantom Radiography chemistry.chemical_compound Optics chemistry Humans Medicine X-Ray Intensifying Screens Radiology Nuclear Medicine and imaging business Lung Digital radiography |
| Zdroj: | Radiology. 227:484-492 |
| ISSN: | 1527-1315 0033-8419 |
| DOI: | 10.1148/radiol.2272010839 |
| Popis: | To compare a large-area amorphous silicon flat-panel detector with an asymmetric screen-film system for the depiction of simulated patterns of interstitial lung disease, nodules, and catheters, as well as for evaluation of dose reduction.Ground-glass, linear, miliary, and reticular patterns; nodules; and catheters were superimposed over an anthropomorphic chest phantom. Hard copies were generated at different dose levels (speeds: 400, 800, and 1,600) with a flat-panel detector and were compared with copies generated with an asymmetric screen-film system (speed, 400). Detection performance of eight radiologists was compared with a receiver operating characteristic analysis of 19,200 observations per pattern. A difference was significant with a P value of.05.There was no statistically significant difference between the flat-panel detector and the asymmetric screen-film system at the same speed (P.05) and between the flat-panel detector at a speed of 800 and the asymmetric screen-film system at a speed of 400 (P.05). The visibility of linear, miliary, and reticular patterns over lucent lung and of nodules smaller than 10 mm and catheters over obscured chest regions on copies generated at a speed of 1,600 with the flat-panel detector decreased, compared with the visibility of these features on copies generated with the asymmetric screen-film system (P.05).The diagnostic performance of the flat-panel detector is comparable to that of the asymmetric screen-film system for depiction of all simulated patterns of interstitial lung diseases, nodules, and catheters at the same speed and offers the potential of dose reduction to a speed of 800. |
| Databáze: | OpenAIRE |
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