کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
443967 692832 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Multi-oriented windowed harmonic phase reconstruction for robust cardiac strain imaging
ترجمه فارسی عنوان
بازسازی فاز هارمونیکی پنجره ای چند گانه برای تصویربرداری با فشار قوی قلبی
کلمات کلیدی
تگ تصویربرداری رزونانس مغناطیسی، بازسازی فاز هارمونیک، مصنوعات، تنزل فشار، تبدیل فوریه پنجره
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر گرافیک کامپیوتری و طراحی به کمک کامپیوتر
چکیده انگلیسی


• Extension of harmonic phase method for tagged-MR.
• Multi-oriented spatial modulation of magnetization.
• Balanced spatio-spectral localization in phase estimation.
• Validation based on the reproducibility of obtained strain.
• More robust and precise measurement of cardiac mechanics.

The purpose of this paper is to develop a method for direct estimation of the cardiac strain tensor by extending the harmonic phase reconstruction on tagged magnetic resonance images to obtain more precise and robust measurements. The extension relies on the reconstruction of the local phase of the image by means of the windowed Fourier transform and the acquisition of an overdetermined set of stripe orientations in order to avoid the phase interferences from structures outside the myocardium and the instabilities arising from the application of a gradient operator. Results have shown that increasing the number of acquired orientations provides a significant improvement in the reproducibility of the strain measurements and that the acquisition of an extended set of orientations also improves the reproducibility when compared with acquiring repeated samples from a smaller set of orientations. Additionally, biases in local phase estimation when using the original harmonic phase formulation are greatly diminished by the one here proposed. The ideas here presented allow the design of new methods for motion sensitive magnetic resonance imaging, which could simultaneously improve the resolution, robustness and accuracy of motion estimates.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Medical Image Analysis - Volume 29, April 2016, Pages 1–11
نویسندگان
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