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[First clinical experience with a full-size, flat-panel detector for imaging the peripheral skeletal system].
S Reissberg1, C Hoeschen, A Kästner
1Klinik für Diagnostische Radiologie der Otto-von-Guericke-Universität Magdeburg. steffen.reissberg@med.uni-magdeburg.de
Rofo : Fortschritte Auf Dem Gebiete Der Rontgenstrahlen Und Der Nuklearmedizin
|November 13, 2001
Summary
Radiologists can halve patient radiation dose for peripheral skeleton imaging using a flat panel detector, maintaining or improving image quality. This dose reduction is effective in routine diagnostics with minimal postprocessing needs.
Area of Science:
- Medical Imaging
- Radiology
- Diagnostic Imaging
Background:
- Conventional screen-film systems require higher radiation doses for peripheral skeletal imaging.
- Advancements in digital radiography offer potential for dose reduction.
Purpose of the Study:
- To evaluate the feasibility of reducing patient radiation dose by 50% for peripheral skeleton imaging using a cesium iodide/amorphous silicon (CsI/a-Si) flat panel detector.
- To assess image quality and diagnostic acceptability at reduced radiation doses.
Main Methods:
- 120 wrist and 100 ankle exposures were performed on a 43 x 43 cm CsI/a-Si flat panel detector system.
- Patient dose was reduced by a factor of two compared to conventional methods.
- Five radiologists evaluated softcopy and hardcopy images using a variation of Visual Grading Analysis (VGA).
- Patient entrance dose was measured using a phantom.
Main Results:
- A dose reduction of approximately 50% is achievable with comparable or improved image quality in routine diagnostics.
- Postprocessing was required for only 3% of ankle and 21% of wrist exposures.
- Exposures with implants showed no artifacts and some yielded better evaluation results than those without implants.
Conclusions:
- Halving patient radiation dose for peripheral skeletal imaging is possible while maintaining acceptable image quality.
- The patient entrance dose is a suitable metric for evaluating radiographic detectors and comparing digital X-ray units.
- Further evaluation of improved image processing techniques is warranted.