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Published on: January 30, 2020
Solid-state, flat-panel, digital radiography detectors and their physical imaging characteristics
A R Cowen1, S M Kengyelics, A G Davies
1LXi Research, Academic Unit of Medical Physics, The University of Leeds, West Yorkshire, UK. a.r.cowen@leeds.ac.uk
Solid-state digital radiography (DR) detectors offer efficient, low-dose X-ray imaging. Indirect conversion DR detectors provide superior image quality and dose efficiency over direct conversion DR and computed radiography (CR) for projection radiography.
Area of Science:
- Medical Imaging Technology
- Radiography
- Detector Physics
Background:
- Solid-state digital radiography (DR) detectors emerged around the millennium.
- These detectors utilize hydrogenated amorphous silicon (a-Si:H) active matrix arrays.
- DR detectors enable efficient, low-dose X-ray acquisition and on-line image readout.
Purpose of the Study:
- To review the principles and technologies of solid-state DR detectors.
- To evaluate and compare the physical imaging characteristics of different DR detector types.
- To compare DR detector performance against computed radiography (CR).
Main Methods:
- Review of indirect-conversion (scintillator-based) and direct-conversion (photoconductor-based) DR detector designs.
- Evaluation of physical imaging characteristics.
- Comparison of performance metrics against computed radiography (CR).
Main Results:
- Indirect conversion DR detectors currently offer superior physical image quality and dose efficiency in standard projection radiography.
- Direct conversion DR and modern point-scan CR show lower performance compared to indirect conversion DR.
- Clinical evaluations confirm the superior performance of indirect conversion DR detectors.
Conclusions:
- Indirect conversion DR detectors are the current standard for superior image quality and dose efficiency in projection radiography.
- Future trends include portable, WiFi-enabled DR detectors and advancements in absorber materials and electronic media.
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