کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
849135 909260 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A soft-threshold filtering EM-TV algorithm for CT reconstruction
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
A soft-threshold filtering EM-TV algorithm for CT reconstruction
چکیده انگلیسی

The expectation maximization (EM) algorithm based on statistical property can reduce image noise and artifacts in CT reconstruction. Considering its slow convergence and unsmooth of reconstruction image, this paper proposed EM-TV algorithm which is combined with the minimization of total variation (TV) and a soft-threshold filtering. To make the data smooth and do not loss the information of the edge, first, using EM algorithm reconstruct an image; then its discrete difference transform (DDT) is calculated and the soft-threshold filtering is updated. Finally, experimental results and comparisons with the EM algorithm of Shepp–Logan phantom show that the proposed algorithm can not only make the image of reconstruction smooth and reduce the normalized mean square distance, but also speed up the convergence. And real projection data indicate that this algorithm is effective.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optik - International Journal for Light and Electron Optics - Volume 126, Issue 2, January 2015, Pages 202–207
نویسندگان
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