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Detection of Porcine Bone Lesions and Fissures

Comparing Digital Selenium, Digital Luminescence, and Analog Film-Screen Radiography

¹ Department of Radiology, University of Cologne Medical School, University of Cologne, Kerpenerstr. 62, 50924 Cologne, Germany.
² Philips Medical Systems, Röntgenstr. 24, 22335 Hamburg, Germany.
³ Department of Medical Statistics, Informatics and Epidemiology, University of Cologne Medical School, 50924 Cologne, Germany.
⁴ Department of Trauma, Hand and Reconstructive Surgery, University of Cologne Medical School, 50924 Cologne, Germany.

OBJECTIVE. The purpose of our study was to compare the diagnostic performance of a digital selenium detector (Thoravision) with that of analog film-screen systems and digital luminescence radiography in skeletal radiography for the detection of fissures and lesions in porcine bones.

MATERIALS AND METHODS. One hundred bones taken from domestic pigs (50 ribs and 50 femurs) were divided into two equal groups. Fissures and bone lesions were created in 50 bones and 50 served as controls. The bones were examined using film-screen systems, digital luminescence radiography, and digital selenium radiography at various doses. Digital selenium radiography exposure values were adapted to the image geometry differing from the reference methods with a detector focus distance of 2.15 m. Four radiologists independently evaluated image quality and detectability of fissures and lesions on a five-point scale of confidence. Statistical evaluation was based on receiver operating characteristic curve analysis.

RESULTS. Fissures and bone lesions were detected most reliably using the mammography film-screen system, but the difference in the results of the analog and digital reference images did not achieve statistical significance.

CONCLUSION. Compared with analog film-screen systems, the lower spatial resolution of the digital selenium and digital luminescence radiography systems does not affect detectability of fissures and bone lesions in porcine bone. Selenium is effective in skeletal radiography for detecting fissures and bone lesions. With digital selenium and digital luminescence radiography, the surface dose can be cut to half that required for 200-speed film-screen systems without losing any diagnostically relevant information.

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