ABSTRACT
PURPOSE: The novel biplanar X-ray unit "EOS", EOS Imaging, allows to acquire simultaneously 2 perpendicular planes of full-length spine and limbs and to measure spatially correct angles based on the acquired image data sets. This is to be seen alongside with a low spatial resolution, high investment costs and high operating expenses. The use of the biplanar X-ray unit in morphology based scelettal radiography might improve the cost-benefit-relation. Thus, the purpose of this study was to compare image quality of the EOS-unit and the flat panel (FP)-technology as reference in a clinical setting. MATERIALS AND METHODS: All 114 patients of the Orthopedic Hospital Dept., who had a biplanar full-length lower limb radiograph and a FP-examination of the pelvis and/or the knee with maximum time interval of 3 months without changes in the clinical and radiological findings were included in the study. All X-ray examinations had been carried out due to clinical indications. Secondary captures comparable to the FP-images were extracted from the electronic EOS-image data sets. 4 radiologists independently from each other compared the visualization of normal anatomical structures of the pseudonymous EOS- and FP-images in a randomized order. RESULTS: In the overwiew of all readers and all sceletal regions image quality of the FP-images was considered being superior in a mean of 83â±â13â% standard deviation of the pair comparisons (minimum 48â%, maximum 100â%). Image quality of the EOS-images was assessed as being superior in 2â±â3â% of the cases (0â%, 10â%). Image quality of 0.8â±â3â% of the FP-images (0â%, 17â%) and 30â±â34â% (0â%, 100â%) of the EOS-images was estimated as diagnostically inadequate. 30â±â33â% of the pair comparisons (0â%, 100â%) showed a diagnostically inadequate image quality of the EOS-images and a diagnostically good image quality of the FP-images. CONCLUSION: Image quality of biplanar full-length lower limb X-ray examinations is not suitable to be used for the diagnostic assessment of the morphological bone structure using the currently available technological setting. KEY POINTS: ⶠbiplanar full-length lower limb X-ray examinations ⶠplat-panel radiography ⶠimage quality.