Image based background magnetic field correction for aortic and pulmonary artery flow measurement using phase contrast
نویسندگان
چکیده
منابع مشابه
Image based magnetic field background correction for aortic and pulmonary artery flow measurement using phase contrast
Methods A large gel phantom was used to assess phase offset in through-plane phase contrast images in x (left to right), y (anterior to posterior) and z directions at the isocenter and in positions ±40 mm and ±80 mm away from the isocenter. Repeated measures were averaged and fit to linear regressions. Phase correction was validated in human study for the assessment of aorta and pulmonary arter...
متن کاملImage based background magnetic field correction for aortic and pulmonary artery flow measurement using phase contrast
Methods Twelve volunteers underwent breath-hold through-plane phase contrast (PC) imaging of cross sectional view of the ascending aorta and PA. PC imaging was immediately repeated on a static fluid-filled phantom. Phase images were analyzed using QFlow (Medis, Leiden, Netherlands.). Phase shift was also analyzed in static background and in surrounding tissues including chest wall fat and muscl...
متن کاملvelocity measurement in carotid artery: quantitative comparison of time-resolved 3d phase-contrast mri and image-based computational fluid dynamics
conclusion both techniques provided quantitatively consistent results of in vivo velocity vector fields in right internal carotid artery (rca). pc mri represented a good estimation of main flow patterns inside the vasculature, which seems to be acceptable for clinical use. however, limitations of each technique should be considered while interpreting results. subjects and methods mr imaging was...
متن کاملQuantification of aortic flow by phase-contrast magnetic resonance in patients with bicuspid aortic valve.
AIMS Bicuspid aortic valve (BAV) causes complex flow patterns in the ascending aorta (AAo), which may compromise the accuracy of flow measurement by phase-contrast magnetic resonance (PC-MR). Therefore, we aimed to assess and compare the accuracy of forward flow measurement in the AAo, where complex flow is more dominant in BAV patients, with flow quantification in the left ventricular outflow ...
متن کاملBackground phase correction using k-space filters in phase contrast velocity encoded MRI
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 s...
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ژورنال
عنوان ژورنال: Journal of Cardiovascular Magnetic Resonance
سال: 2011
ISSN: 1532-429X
DOI: 10.1186/1532-429x-13-s1-p355