Comput Methods Programs Biomed - Metal artifact reduction in dental CT images using polar mathematical morphology.

Tópicos

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Resumo

Most dental implant planning systems use a 3D representation of the CT scan of the patient under study as it provides a more intuitive view of the human jaw. The presence of metallic objects in human jaws, such as amalgam or gold fillings, provokes several artifacts like streaking and beam hardening which makes the reconstruction process difficult. In order to reduce these artifacts, several methods have been proposed using the raw data, directly obtained from the tomographs, in different ways. However, in DICOM-based applications this information is not available, and thus the need of a new method that handles this task in the DICOM domain. The presented method performs a morphological filtering in the polar domain yielding output images less affected by artifacts (even in cases of multiple metallic objects) without causing significant smoothing of the anatomic structures, which allows a great improvement in the 3D reconstruction. The algorithm has been automated and compared to other image denoising methods with successful results.

Resumo Limpo

dental implant plan system use d represent ct scan patient studi provid intuit view human jaw presenc metal object human jaw amalgam gold fill provok sever artifact like streak beam harden make reconstruct process difficult order reduc artifact sever method propos use raw data direct obtain tomograph differ way howev dicombas applic inform avail thus need new method handl task dicom domain present method perform morpholog filter polar domain yield output imag less affect artifact even case multipl metal object without caus signific smooth anatom structur allow great improv d reconstruct algorithm autom compar imag denois method success result

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