Background phase correction using k-space filters in phase contrast velocity encoded MRI
نویسندگان
چکیده
Figure 5: In-vivo background phase correction. (a) Magnitude image, (b) the original phase image, with the dashed blue line defining the area and (c) the red contour of stationary tissue for polynomial surface subtraction, (d) is ground truth, (e) 5th order polynomial subtraction, and (f) k-space filtering with a 64×64 pixel Gaussian kernel. Figure 1: phantom with steady-state flow. Red lines show contours of stationary pixels and the yellow line defines the location of the flow profile calculations. Background phase correction using k-space filters in phase contrast velocity encoded MRI
منابع مشابه
Background phase correction in phase contrast velocity encoded CMR reduces gender differences and improves the accuracy and precision of Qp/Qs
Background Cardiovascular magnetic resonance (CMR) flow quantification for determining the ratio of flow between the pulmonary and systemic circulation (Qp/Qs) is used to quantify cardiac shunts. However, both the accuracy and precision of Qp/Qs can be influenced by measurement errors in flow quantification. Post-processing methods for stationary tissue background correction have been proposed ...
متن کاملAnalysis and Correction of the Effect of Spatial Gradient Field Distortions on Velocity Measurements with Phase Contrast MRI
An analysis of the effect of spatially inhomogeneous gradient fields on quantitative phase contrast MRI measurements is presented. A local error in the gradient strength leads to incorrect velocity encoding. Here the error in the measured velocities is compared to a theoretical model of gradient field imperfection. Depending on the spatial location of the region of interest for velocity measure...
متن کاملBest precision in measuring Qp/Qs is achieved with quadratic, not linear, stationary tissue background correction in phase contrast velocity encoded CMR
Background Cardiovascular magnetic resonance (CMR) flow quantification for determining the ratio of flow between the pulmonary artery and aorta (Qp/Qs) is used to quantify cardiac shunts. Post-processing methods, including linear or quadratic stationary tissue background correction have been proposed to improve accuracy and precision in flow quantification. However, it is not known which method...
متن کاملNon-convex greedy compressed sensing for phase contrast MRI
Introduction We propose a novel compressed sensing algorithm for Phase Contrast MRI(PC-MRI) to estimate blood flow velocities. Blood flow velocities provide clinically useful information such as pressure gradients and PC-MRI has become an established technique to measure them. In conventional PC-MRI, velocity information is computed by comparing the phases of the velocity-encoded image and the ...
متن کاملUltra-Fast MR Velocity Measurement using Spin-Tagging and Single-Echo Acquisition (SEA) Imaging
INTRODUCTION Characterization of non-periodic motion, such as turbulent flow patterns in stenotic vessels remains a challenging problem for MR imaging. Of particular interest in this study is the development of flow characterization techniques for microfluidic lab-on-a-chip devices. Methods are being investigated to create chaotic flow patterns in these devices, which can decrease mixing times ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2009