Directional fractal signature analysis of trabecular bone: evaluation of different methods to detect early osteoarthritis in knee radiographs
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There is ongoing research directed towards the development of cheap and reliable decision support systems for the detection and prediction of osteoarthritis (OA) in knee joints. Fractal analysis of trabecular bone texture X-ray images is one of the most promising approaches. It is cheap and non-invasive. However, difficulties arise when the fractal signature methods are used to quantify bone roughness and anisotropy on individual scales. This is because the fractal methods are able to quantify bone texture only in the vertical and horizontal directions, and previous studies showed that OA bone changes can occur in any direction. To address these difficulties, three directional fractal signature methods were developed in this study, i.e. a fractal signature Hurst orientation transform (FSHOT) method, a variance orientation transform (VOT) method, and a blanket with rotating-grid (BRG) method. These methods were tested and the best performing method was selected. Unlike other methods, the newly developed techniques are able to calculate fractal dimensions (FDs) on individual scales (i.e. fractal signature) in all possible directions. The accuracy of the methods developed in measuring texture roughness and anisotropy on individual scales was evaluated. The effects of imaging conditions such as image noise, blur, exposure, magnification, and projection angle and the effects of translation of the bone region of interest on texture parameters were also evaluated. Computer-generated fractal surface images with known FDs and X-ray images obtained for a human tibia head were used. Results obtained show that the VOT method performs better than the FSHOT and BRG methods.
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A new method to measure trabecular bone texture on hand radiographs: data from the osteoarthritis initiativeWolski, Marcin; Podsiadlo, Pawel; Stachowiak, Gwidon (2014)Purpose: Grading of hand radiographs for joint space narrowing and osteophytes is the traditional method for assessing hand OA. However this assessment can be difficult and inaccurate since the changes of cartilage volume ...
Differences in trabecular bone texture between knees with and without radiographic osteoarthritis detected by fractal methodsPodsiadlo, Pawel; Dahl, L; Englund, M; Lohmander, L; Stachowiak, Gwidon (2008)Objective: To develop an accurate method for quantifying differences in the trabecular structure in the tibial bone between subjects with and without knee osteoarthritis (OA). Methods: Standard knee radiographs were taken ...
Directional fractal signature methods for trabecular bone texture in hand radiographs: Data from the Osteoarthritis InitiativeWolski, M.; Podsiadlo, P.; Stachowiak, Gwidon (2014)Purpose: To develop directional fractal signature methods for the analysis of trabecular bone (TB) texture in hand radiographs. Problems associated with the small size of hand bones and the orientation of fingers were ...