Velocity vector reconstruction for real‐time phase‐contrast MRI with radial Maxwell correction

Purpose: To evaluate aortic pulse wave velocities obtained by real-time phase-contrast (PC) MRI in comparison to cine PC MRI. Methods: Real-time PC MRI of eight healthy volunteers employed highly undersampled radial FLASH sequences and phase-sensitive image reconstructions by regularized nonlinear inversion (NLINV) at 40 ms temporal resolution and 1.3 mm in-plane resolution. Pulse wave velocities were analyzed for combinations of 2, 3 and 4 locations of aortic flow using time-to-upslope and cross-correlation methods. Results: For the time-to-upslope analysis mean pulse wave velocities ranged from 3.5 to 3.9 m s-1 for real-time PC MRI and from 3.5 to 3.8 m s-1 for cine PC MRI. A cross-correlation analysis of the same data resulted in 2.9 to 3.3 m s-1 and 3.3 to 3.7 m s-1, respectively. Conclusion: Real-time PC MRI determined aortic pulse wave velocities from single cardiac cycles in close correspondence to values obtained by cine PC MRI.

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Real-time phase-contrast MRI of cardiovascular blood flow using undersampled radial fast low-angle shot and nonlinear inverse reconstruction

NMR in Biomedicine ◽

10.1002/nbm.1812 ◽

2011 ◽

Vol 25 (7) ◽

pp. 917-924 ◽

Cited By ~ 48

Author(s):

Arun A. Joseph ◽

Klaus-Dietmar Merboldt ◽

Dirk Voit ◽

Shuo Zhang ◽

Martin Uecker ◽

...

Keyword(s):

Blood Flow ◽

Real Time ◽

Phase Contrast ◽

Phase Contrast Mri ◽

Inverse Reconstruction ◽

Cardiovascular Blood Flow

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Time‐optimized 4D phase contrast MRI with real‐time convex optimization of gradient waveforms and fast excitation methods

Magnetic Resonance in Medicine ◽

10.1002/mrm.27716 ◽

2019 ◽

Vol 82 (1) ◽

pp. 213-224 ◽

Cited By ~ 3

Author(s):

Michael Loecher ◽

Patrick Magrath ◽

Eric Aliotta ◽

Daniel B. Ennis

Keyword(s):

Convex Optimization ◽

Real Time ◽

Phase Contrast ◽

Phase Contrast Mri ◽

Fast Excitation ◽

Gradient Waveforms

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Quantifying the influence of respiration and cardiac pulsations on cerebrospinal fluid dynamics using real-time phase-contrast MRI

Journal of Magnetic Resonance Imaging ◽

10.1002/jmri.25591 ◽

2017 ◽

Vol 46 (2) ◽

pp. 431-439 ◽

Cited By ~ 39

Author(s):

Selda Yildiz ◽

Suraj Thyagaraj ◽

Ning Jin ◽

Xiaodong Zhong ◽

Soroush Heidari Pahlavian ◽

...

Keyword(s):

Fluid Dynamics ◽

Cerebrospinal Fluid ◽

Real Time ◽

Phase Contrast ◽

Cerebrospinal Fluid Dynamics ◽

Phase Contrast Mri

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Measurement of Tongue Tip Velocity from Real-Time MRI and Phase-Contrast Cine-MRI in Consonant Production

Journal of Imaging ◽

10.3390/jimaging6050031 ◽

2020 ◽

Vol 6 (5) ◽

pp. 31 ◽

Cited By ~ 1

Author(s):

Karyna Isaieva ◽

Yves Laprie ◽

Freddy Odille ◽

Ioannis K. Douros ◽

Jacques Felblinger ◽

...

Keyword(s):

Real Time ◽

Phase Contrast ◽

Sagittal Plane ◽

Cine Mri ◽

Resonance Imaging ◽

Phase Contrast Mri ◽

French Speaking ◽

Magnetic Resonance Imaging Mri ◽

Tip Velocity ◽

Approach Phase

We evaluate velocity of the tongue tip with magnetic resonance imaging (MRI) using two independent approaches. The first one consists in acquisition with a real-time technique in the mid-sagittal plane. Tracking of the tongue tip manually and with a computer vision method allows its trajectory to be found and the velocity to be calculated as the derivative of the coordinate. We also propose to use another approach—phase contrast MRI—which enables velocities of the moving tissues to be measured directly. We recorded the sound simultaneously with the MR acquisition which enabled us to make conclusions regarding the relation between the movements and the sound. We acquired the data from two French-speaking subjects articulating /tata/. The results of both methods are in qualitative agreement and are consistent with other reviewer techniques used for evaluation of the tongue tip velocity.

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