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Highly constrained backprojection for time‐resolved MRI
A simple non‐iterative unfiltered backprojection algorithm that incorporates the idea of a composite image consisting of portions or all of the acquired data to constrain the back projection process is presented, which significantly reduces streak artifacts and increases the overall SNR.
Improved waveform fidelity using local HYPR reconstruction (HYPR LR)
- Kevin M. Johnson, J. Velikina, Yijing Wu, S. Kecskemeti, O. Wieben, C. Mistretta
- MathematicsMagnetic resonance in medicine
- 1 March 2008
The idea of constraining the backprojected data further to a series of local regions of interest in order to decrease the corruption of local information by distant signals is developed, resulting in increased signal‐to‐noise ratio and quantitative reconstruction accuracy.
Fast Realistic MRI Simulations Based on Generalized Multi-Pool Exchange Tissue Model
- Fang Liu, J. Velikina, W. Block, Richard Kijowski, A. Samsonov
- Physics, Computer ScienceIEEE Transactions on Medical Imaging
- 25 October 2016
MRiLab combines realistic tissue modeling with numerical virtualization of an MRI system and scanning experiment to enable assessment of a broad range of MRI approaches including advanced quantitative MRI methods inferring microstructure on a sub-voxel level.
Limited view angle tomographic image reconstruction via total variation minimization
A novel image reconstruction method via minimizing the total variation of the reconstructed image for limited view angle X-ray computed tomography is presented, which is superior to direct Fourier inversion reconstruction algorithm and the projection onto convex sets (POCS) image reconstruction algorithm.
Adaptive retrospective correction of motion artifacts in cranial MRI with multicoil three‐dimensional radial acquisitions
- A. Anderson, J. Velikina, W. Block, O. Wieben, A. Samsonov
- PhysicsMagnetic resonance in medicine
- 1 April 2013
A novel motion correction technique that is capable of restoring image quality in motion corrupted two‐dimensional and three‐dimensional radial acquisitions without a priori assumptions about when motion occurs is introduced.
Three‐dimensional imaging of ventilation dynamics in asthmatics using multiecho projection acquisition with constrained reconstruction
Gas trapping was detected using MRI in five of the six asthmatic subjects who displayed air trapping with multidetector CT and Phantom studies showed the proposed technique significantly improved depiction of moving objects compared to view‐sharing methods.
Velocity Measurements in the Middle Cerebral Arteries of Healthy Volunteers Using 3D Radial Phase-Contrast HYPRFlow: Comparison with Transcranial Doppler Sonography and 2D Phase-Contrast MR Imaging
PC-VIPR is a technique capable of acquiring high- resolution MRA of diagnostic quality with velocity data comparable with TCD and 2D-PC, and the combination of velocity information and fast high-resolution whole-brain morphologic angiograms makes PC HYPRFlow an attractive alternative to current MRA methods.
PC HYPR flow: A technique for rapid imaging of contrast dynamics
- J. Velikina, Kevin M. Johnson, Yijing Wu, A. Samsonov, P. Turski, C. Mistretta
- MedicineJournal of magnetic resonance imaging : JMRI
- 1 February 2010
To improve spatial and temporal resolution and signal‐to‐noise ratio (SNR) in three‐dimensional (3D) radial contrast‐enhanced (CE) time‐resolved MR angiography by means of a novel hybrid phase…
Reconstruction of dynamic image series from undersampled MRI data using data‐driven model consistency condition (MOCCO)
To accelerate dynamic MR imaging through development of a novel image reconstruction technique using low‐rank temporal signal models preestimated from training data.
POCS‐enhanced correction of motion artifacts in parallel MRI
- A. Samsonov, J. Velikina, Youngkyoo Jung, E. Kholmovski, Chris R. Johnson, W. Block
- Computer ScienceMagnetic resonance in medicine
- 1 April 2010
An important advantage of the new POCS‐based method is that, in addition to multicoil data redundancy, it can use a priori known properties about the imaged object for improved MR image artifact correction.