کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4965073 1447941 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rapid reconstruction of quantitative susceptibility mapping via improved ℓ0 norm approximation
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نرم افزارهای علوم کامپیوتر
پیش نمایش صفحه اول مقاله
Rapid reconstruction of quantitative susceptibility mapping via improved ℓ0 norm approximation
چکیده انگلیسی
Quantitative susceptibility mapping (QSM) reconstruction is a well-known ill-posed problem. Various regularization techniques have been proposed for solving this problem. In this paper, a rapid method is proposed that uses ℓ0 norm minimization in a gradient domain. Because ℓ0 minimization is an NP-hard problem, a special alternating optimization strategy is employed to simplify the reconstruction algorithm. The proposed algorithm uses only simple point-wise multiplications and thresholding operations, and significantly speeds up the calculation. Both numerical simulations and in vivo experiments demonstrate that the proposed method can reconstruct susceptibility fast and accurately. Because morphology information weighted methods have achieved considerable success in QSM, we performed a quantitative comparison with some typical weighted methods, such as MEDI (morphology enabled dipole inversion), iLSQR (improved least squares algorithm), and wℓ1 (weighted ℓ1 norm minimization). The reconstructed results show that the proposed method can provide accurate results with a satisfactory speed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computers in Biology and Medicine - Volume 79, 1 December 2016, Pages 59-67
نویسندگان
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