A Genetic Search-based Partial Image Matching

A novel method for global rigid matching of partialview images is presented in the paper. The method utilizes a genetic algorithm (GA) to search the transformation parameter space and a distance transform (DT) to compute a goodness-ofmatch measure. The problem of partial image registration has been solved by tresholding the transformed images around the edge and in this way emphasizing matching of the object shape. The algorithm have been proved to have fast convergence. 1. INTRODUCTION Image matching or registration plays an important role in many applications such as multi-modality medical imaging and multi-spectral image analysis. The role of matching is to integrate multiple sources of object information into a single image. The matching problem consists in determining the unknown transform parameters required to map one image to match the other image. Most image matching research efforts have been concentrated on algorithms for matching of images containing a full-view of the obj..

Unusual localization and presentation of osteoid osteoma mimicking juvenile spondyloarthritis: a case report

Abstract Background Osteoid osteoma is a painful benign skeletal tumour of unknown aetiology. Most often it occurs in the long bones of extremities and responds well to nonsteroidal anti-inflammatory medications. However, unusual localization and atypical presentation of this tumour might present a diagnostic challenge, especially if symptoms mimic that indicative of juvenile spondyloarthritis. Case presentation A misdiagnosed ten-and-a-half-year-old girl with osteoid osteoma involving the distal phalanx of a little finger is presented. Her initial symptoms were pain and swelling of the little finger resembling dactylitis, while various imaging modalities showed signs of tenosynovitis, indicating a possible development of juvenile spondyloarthritis. Several trials of different non-steroid anti-inflammatory drugs gave no satisfactory results and ultrasound guided triamcinolone-hexacetonide injection provided only a short relief. Finally, almost three years after initial presentation, persistent clinical symptoms warranted repeated imaging that raised suspicion of an osteoid osteoma. Directed treatment with surgical intervention led to almost immediate and complete resolution of her symptoms. Conclusions Osteoid osteoma should be suspected in case of a tender swelling of a digit in children and adolescents, regardless of initial imaging findings and clinical presentation. Early diagnosis and treatment of this benign condition can have a substantial impact on quality of life of patients and their families and protect them from many unnecessary diagnostic procedures and treatment

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