Hamer, Okka W. and Strotzer, Michael and Zorger, Niels and Paetzel, Christian and Lerch, Klaus and Feuerbach, Stefan and Voelk, Markus (2004) Amorphous silicon, flat-panel, X-ray detector: Reliability of digital image fusion regarding angle and distance measurements in long-leg radiography. INVESTIGATIVE RADIOLOGY, 39 (5). pp. 271-276. ISSN 0020-9996,
Full text not available from this repository. (Request a copy)Abstract
Rationale and Objectives: To evaluate composed long-leg images acquired with a large-area, flat-panel x-ray detector with regard to angle and distance measurements. Methods: Radiographs of a long-leg phantom were acquired at 13 different angle settings with a 43-cm x 43-cm digital x-ray detector based on cesium iodide (CsI) and amorphous silicon (a-Si) technology. Three overlapping single images of the phantom were reconstructed at a workstation using, a generalized correlation method. Four blinded observers were instructed to determine the angle of the axis of the long-leus as well as the length Of "femur" and "tibia" on soft-copy displays. For that, the angle and distance measurement software integrated in the workstation was used. The images were analyzed with and without prior manual fine tuning of the primary composition result according to a mapped scale. Standard of reference was angle and distance determination at the phantom. Results: On average. the difference between the observers' angle measurements and the standard of reference was 0.4degrees for both images with and without prior manual correction. Regarding distance measurements, the average discrepancies to the standard were 0.2 cm (femur) and 0.1 cm (tibia) when analyzing images that had undergone manual fine tuning and 0.5 cm and 0.7 cm, respectively, for images without manual correction. Conclusions: The evaluated image fusion algorithm in conjunction with a 43-cm x 43-cm flat-panel detector is feasible regarding angle and distance measurements on long-leg images. In the case of inaccurate primary composition, results can be corrected easily by manual fine tuning.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FILM-SCREEN RADIOGRAPHY; DOSE REDUCTION; COMPUTED RADIOGRAPHY; LARGE-AREA; PHANTOM; QUALITY; SYSTEM; image composition; flat-panel detector; digital radiography; long-leg radiography |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Orthopädie Medicine > Lehrstuhl für Röntgendiagnostik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 20 Jul 2021 13:28 |
| Last Modified: | 20 Jul 2021 13:28 |
| URI: | https://pred.uni-regensburg.de/id/eprint/37695 |
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