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Scan time reduction in ²³Na-Magnetic Resonance Imaging using the chemical shift imaging sequence: Evaluation of an iterative reconstruction method.
Z Med Phys. 2015 Sep; 25(3):275-86.ZM

Abstract

AIM

To evaluate potential scan time reduction in (23)Na-Magnetic Resonance Imaging with the chemical shift imaging sequence (CSI) using undersampled data of high-quality datasets, reconstructed with an iterative constrained reconstruction, compared to reduced resolution or reduced signal-to-noise ratio.

MATERIALS AND METHODS

CSI (23)Na-images were retrospectively undersampled and reconstructed with a constrained reconstruction scheme. The results were compared to conventional methods of scan time reduction. The constrained reconstruction scheme used a phase constraint and a finite object support, which was extracted from a spatially registered (1)H-image acquired with a double-tuned coil. The methods were evaluated using numerical simulations, phantom images and in-vivo images of a healthy volunteer and a patient who suffered from cerebral ischemic stroke.

RESULTS

The constrained reconstruction scheme showed improved image quality compared to a decreased number of averages, images with decreased resolution or circular undersampling with weighted averaging for any undersampling factor. Brain images of a stroke patient, which were reconstructed from three-fold undersampled k-space data, resulted in only minor differences from the original image (normalized root means square error < 12%) and an almost identical delineation of the stroke region (mismatch < 6%).

CONCLUSION

The acquisition of undersampled (23)Na-CSI images enables up to three-fold scan time reduction with improved image quality compared to conventional methods of scan time saving.

Authors+Show Affiliations

Computer Assisted Clinical Medicine, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany. Electronic address: sebastian.weingaertner@medma.uni-heidelberg.de.Computer Assisted Clinical Medicine, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany; Trinity Institute of Neuroscience, Trinity College, Dublin University, Dublin, Republic of Ireland.Computer Assisted Clinical Medicine, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany.Department of Neurology, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany.Department of Neuroradiology, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany.Computer Assisted Clinical Medicine, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25270979

Citation

Weingärtner, Sebastian, et al. "Scan Time Reduction in ²³Na-Magnetic Resonance Imaging Using the Chemical Shift Imaging Sequence: Evaluation of an Iterative Reconstruction Method." Zeitschrift Fur Medizinische Physik, vol. 25, no. 3, 2015, pp. 275-86.
Weingärtner S, Wetterling F, Konstandin S, et al. Scan time reduction in ²³Na-Magnetic Resonance Imaging using the chemical shift imaging sequence: Evaluation of an iterative reconstruction method. Z Med Phys. 2015;25(3):275-86.
Weingärtner, S., Wetterling, F., Konstandin, S., Fatar, M., Neumaier-Probst, E., & Schad, L. R. (2015). Scan time reduction in ²³Na-Magnetic Resonance Imaging using the chemical shift imaging sequence: Evaluation of an iterative reconstruction method. Zeitschrift Fur Medizinische Physik, 25(3), 275-86. https://doi.org/10.1016/j.zemedi.2014.08.007
Weingärtner S, et al. Scan Time Reduction in ²³Na-Magnetic Resonance Imaging Using the Chemical Shift Imaging Sequence: Evaluation of an Iterative Reconstruction Method. Z Med Phys. 2015;25(3):275-86. PubMed PMID: 25270979.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Scan time reduction in ²³Na-Magnetic Resonance Imaging using the chemical shift imaging sequence: Evaluation of an iterative reconstruction method. AU - Weingärtner,Sebastian, AU - Wetterling,Friedrich, AU - Konstandin,Simon, AU - Fatar,Marc, AU - Neumaier-Probst,Eva, AU - Schad,Lothar R, Y1 - 2014/09/28/ PY - 2014/03/14/received PY - 2014/07/31/revised PY - 2014/08/29/accepted PY - 2014/10/2/entrez PY - 2014/10/2/pubmed PY - 2016/5/18/medline KW - (23)Na-MRI KW - (23)Na-Magnetresonanzbildgebung KW - Compressed Sensing KW - Unterabtastung KW - beschränkte Rekonstruktionsverfahren KW - compressed sensing KW - constrained reconstruction KW - undersampling SP - 275 EP - 86 JF - Zeitschrift fur medizinische Physik JO - Z Med Phys VL - 25 IS - 3 N2 - AIM: To evaluate potential scan time reduction in (23)Na-Magnetic Resonance Imaging with the chemical shift imaging sequence (CSI) using undersampled data of high-quality datasets, reconstructed with an iterative constrained reconstruction, compared to reduced resolution or reduced signal-to-noise ratio. MATERIALS AND METHODS: CSI (23)Na-images were retrospectively undersampled and reconstructed with a constrained reconstruction scheme. The results were compared to conventional methods of scan time reduction. The constrained reconstruction scheme used a phase constraint and a finite object support, which was extracted from a spatially registered (1)H-image acquired with a double-tuned coil. The methods were evaluated using numerical simulations, phantom images and in-vivo images of a healthy volunteer and a patient who suffered from cerebral ischemic stroke. RESULTS: The constrained reconstruction scheme showed improved image quality compared to a decreased number of averages, images with decreased resolution or circular undersampling with weighted averaging for any undersampling factor. Brain images of a stroke patient, which were reconstructed from three-fold undersampled k-space data, resulted in only minor differences from the original image (normalized root means square error < 12%) and an almost identical delineation of the stroke region (mismatch < 6%). CONCLUSION: The acquisition of undersampled (23)Na-CSI images enables up to three-fold scan time reduction with improved image quality compared to conventional methods of scan time saving. SN - 1876-4436 UR - https://www.unboundmedicine.com/medline/citation/25270979/Scan_time_reduction_in_²³Na_Magnetic_Resonance_Imaging_using_the_chemical_shift_imaging_sequence:_Evaluation_of_an_iterative_reconstruction_method_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0939-3889(14)00102-0 DB - PRIME DP - Unbound Medicine ER -