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Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine

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https://read.qxmd.com/read/30773679/sparkling-variable-density-k-space-filling-curves-for-accelerated-t-2-weighted-mri
#1
Carole Lazarus, Pierre Weiss, Nicolas Chauffert, Franck Mauconduit, Loubna El Gueddari, Christophe Destrieux, Ilyess Zemmoura, Alexandre Vignaud, Philippe Ciuciu
PURPOSE: To present a new optimition-driven design of optimal k-space trajectories in the context of compressed sensing: Spreading Projection Algorithm for Rapid K-space sampLING (SPARKLING). THEORY: The SPARKLING algorithm is a versatile method inspired from stippling techniques that automatically generates optimized sampling patterns compatible with MR hardware constraints on maximum gradient amplitude and slew rate. These non-Cartesian sampling curves are designed to comply with key criteria for optimal sampling: a controlled distribution of samples (e...
February 17, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30770575/measurement-of-synovial-tissue-volume-in-knee-osteoarthritis-using-a-semiautomated-mri-based-quantitative-approach
#2
Thomas A Perry, Andrew Gait, Terence W O'Neill, Matthew J Parkes, Richard Hodgson, Michael J Callaghan, Nigel K Arden, David T Felson, Timothy F Cootes
PURPOSE: Synovitis is common in knee osteoarthritis and is associated with both knee pain and progression of disease. Semiautomated methods have been developed for quantitative assessment of structure in knee osteoarthritis. Our aims were to apply a novel semiautomated assessment method using 3D active appearance modeling for the quantification of synovial tissue volume (STV) and to compare its performance with conventional manual segmentation. METHODS: Thirty-two sagittal T1 -weighted fat-suppressed contrast-enhanced MRIs were assessed for STV by a single observer using 1) manual segmentation and 2) a semiautomated approach...
February 15, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30761599/patient-specific-prospective-respiratory-motion-correction-for-efficient-free-breathing-cardiovascular-mri
#3
Michael A Bush, Rizwan Ahmad, Ning Jin, Yingmin Liu, Orlando P Simonetti
PURPOSE: To develop a patient-specific respiratory motion correction technique with true 100% acquisition efficiency. METHODS: A short training scan consisting of a series of single heartbeat images, each acquired with a preceding diaphragmatic navigator, was performed to fit a model relating the patient-specific 3D respiratory motion of the heart-to-diaphragm position. The resulting motion model was then used to update the imaging plane in real-time to correct for translational motion based on respiratory position provided by the navigator...
February 14, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30761607/a-new-electron-paramagnetic-resonance-device-to-measure-transcutaneous-oxygen-in-humans
#4
LETTER
Samir Henni, Jeanne Hersant, Anne Sophie Gourdier, Myriam Ammi, Pierre Abraham
No abstract text is available yet for this article.
February 13, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30761605/application-of-spot-chip-for-transcutaneous-oximetry
#5
Maciej M Kmiec, Huagang Hou, M Lakshmi Kuppusamy, Thomas M Drews, Anjali M Prabhat, Sergey V Petryakov, Eugene Demidenko, Philip E Schaner, Jay C Buckey, Aharon Blank, Periannan Kuppusamy
No abstract text is available yet for this article.
February 13, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30756432/radial-streak-artifact-reduction-using-phased-array-beamforming
#6
Sagar Mandava, Mahesh B Keerthivasan, Diego R Martin, Maria I Altbach, Ali Bilgin
PURPOSE: A new method for streak artifact reduction in radial MRI based on phased array filtering. THEORY: Radial imaging in applications that require large fields-of-view can be susceptible to streaking artifacts due to gradient nonlinearities. Coil removal methods prune the coils contributing the most to streaking artifacts at the expense of signal loss. Phased array beamforming is a form of spatial filtering used to suppress unwanted signals. The proposed method uses interference covariance generated from the streaking artifact samples which are manually extracted with phased array beamforming to suppress streaking in the images...
February 12, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30756426/radiofrequency-phase-encoded-half-pulses-in-simultaneous-multislice-ultrashort-echo-time-imaging
#7
Christoph Rettenmeier, V Andrew Stenger
PURPOSE: To describe a simultaneous multislice (SMS) ultrashort echo time (UTE) imaging method using radiofrequency phase encoded half-pulses in combination with power independent of number of slices (PINS) inversion recovery (IR) pulses to generate multiple-slice images with short T2 * contrasts in less than 3 min with close to an eightfold acceleration compared with a standard 2D approach. THEORY AND METHODS: Radiofrequency phase encoding is applied in an SMS (NSMS = 4) excitation scheme using "sinc" half-pulses...
February 12, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30756424/measurement-of-microvascular-cerebral-blood-volume-changes-over-the-cardiac-cycle-with-ferumoxytol-enhanced-t-2-mri
#8
Leonardo A Rivera-Rivera, Kevin M Johnson, Patrick A Turski, Oliver Wieben, Tilman Schubert
PURPOSE: This feasibility study investigates the non-invasive measurement of microvascular cerebral blood volume (BV) changes over the cardiac cycle using cardiac-gated, ferumoxytol-enhanced <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>T</mml:mi> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> <mml:mrow> <mml:mrow/> <mml:mo>∗</mml:mo> </mml:mrow> </mml:msubsup> </mml:math> MRI...
February 12, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30786047/erratum-to-automatic-quantification-of-bone-marrow-edema-on-mri-of-the-wrist-in-patients-with-early-arthritis-a-feasibility-study-magn-reson-med-2018-79-1127-1134
#9
Evgeni Aizenberg, Edgar A H Roex, Wouter P Nieuwenhuis, Lukas Mangnus, Annette H M van der Helm-van Mil, Monique Reijnierse, Johan L Bloem, Boudewijn P F Lelieveldt, Berend C Stoel
No abstract text is available yet for this article.
February 8, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30737847/cerebral-blood-volume-mapping-using-fourier-transform-based-velocity-selective-saturation-pulse-trains
#10
Qin Qin, Yaoming Qu, Wenbo Li, Dapeng Liu, Taehoon Shin, Yansong Zhao, Doris D Lin, Peter C M van Zijl, Zhibo Wen
PURPOSE: Velocity-selective saturation (VSS) pulse trains provide a viable alternative to the spatially selective methods for measuring cerebral blood volume (CBV) by reducing the sensitivity to arterial transit time. This study is to compare the Fourier-transform-based velocity-selective saturation (FT-VSS) pulse trains with the conventional flow-dephasing VSS techniques for CBV quantification. METHODS: The proposed FT-VSS label and control modules were compared with VSS pulse trains utilizing double refocused hyperbolic tangent (DRHT) and 8-segment B1-insensitive rotation (BIR-8)...
February 8, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30737840/dynamic-31-p-spectroscopic-imaging-of-skeletal-muscles-combining-flyback-echo-planar-spectroscopic-imaging-and-compressed-sensing
#11
Alejandro Santos-Díaz, Diana Harasym, Michael D Noseworthy
PURPOSE: Dynamic phosphorus MR spectroscopic imaging (31 P-MRSI) experiments require temporal resolution on the order of seconds to concurrently assess different muscle groups. A highly accelerated pulse sequence combining flyback echo-planar spectroscopic imaging (EPSI) and compressed sensing was developed and tested in a phantom and healthy humans during an exercise-recovery challenge of the lower leg muscles, using a clinical 3T MRI. METHODS: A flyback EPSI readout designed to achieve 2...
February 8, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30737836/a-black-blood-ultra-short-echo-time-ute-sequence-for-3d-isotropic-resolution-imaging-of-the-lungs
#12
Jean Delacoste, Helene Feliciano, Jérôme Yerly, Vincent Dunet, Catherine Beigelman-Aubry, Giulia Ginami, Ruud B van Heeswijk, Davide Piccini, Matthias Stuber, Alain Sauty
PURPOSE: Ultra-short echo time MRI is a promising alternative to chest CT for cystic fibrosis patients. Black-blood imaging in particular could help discern small-sized anomalies, such as mucoid plugging, which may otherwise be confused with neighboring blood vessels, particularly when contrast agent is not used. We, therefore, implemented and tested an ultra-short echo time sequence with black-blood preparation. Additionally, this sequence may also be used to generate bright-blood angiograms...
February 8, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30737833/absolute-quantitative-mr-perfusion-and-comparison-against-stable-isotope-microspheres
#13
Yong I Jeong, Gregory A Christoforidis, Niloufar Saadat, Keigo Kawaji, Charles G Cantrell, Steven Roth, Marek Niekrasz, Timothy J Carroll
PURPOSE: This work sought to compare a quantitative T1 bookend dynamic susceptibility contrast MRI based perfusion protocol for absolute cerebral blood flow (qCBF) against CBF measured by the stable-isotope neutron capture microsphere method, a recognized reference standard for measuring tissue blood flow, at normocapnia, hypercapnia, and in acute stroke. METHODS: CBF was measured in anesthetized female canines by MRI and microspheres over 2 consecutive days for each case...
February 8, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30737827/development-and-clinical-implementation-of-seednet-a-sliding-window-convolutional-neural-network-for-radioactive-seed-identification-in-mri-assisted-radiosurgery-mars
#14
Jeremiah W Sanders, Steven J Frank, Rajat J Kudchadker, Teresa L Bruno, Jingfei Ma
PURPOSE: To develop and evaluate a sliding-window convolutional neural network (CNN) for radioactive seed identification in MRI of the prostate after permanent implant brachytherapy. METHODS: Sixty-eight patients underwent prostate cancer low-dose-rate (LDR) brachytherapy using radioactive seeds stranded with positive contrast MR-signal seed markers and were scanned using a balanced steady-state free precession pulse sequence with and without an endorectal coil (ERC)...
February 8, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30737825/a-method-for-correcting-breathing-induced-field-fluctuations-in-t2-weighted-spinal-cord-imaging-using-a-respiratory-trace
#15
S Johanna Vannesjo, Stuart Clare, Lars Kasper, Irene Tracey, Karla L Miller
PURPOSE: Spinal cord MRI at ultrahigh field is hampered by time-varying magnetic fields associated with the breathing cycle, giving rise to ghosting artifacts in multi-shot acquisitions. Here, we suggest a correction approach based on linking the signal from a respiratory bellows to field changes inside the spinal cord. The information is used to correct the data at the image reconstruction level. METHODS: The correction was demonstrated in the context of multi-shot T2*-weighted imaging of the cervical spinal cord at 7T...
February 8, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30737816/accuracy-and-precision-of-electrical-permittivity-mapping-at-3t-the-impact-of-three-b-1-mapping-techniques
#16
Soraya Gavazzi, Cornelis A T van den Berg, Alessandro Sbrizzi, H Petra Kok, Lukas J A Stalpers, Jan J W Lagendijk, Hans Crezee, Astrid L H M W van Lier
PURPOSE: To investigate the sequence-specific impact of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> amplitude mapping on the accuracy and precision of permittivity reconstruction at 3T in the pelvic region. METHODS: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> maps obtained with actual flip angle imaging (AFI), Bloch-Siegert (BS), and dual refocusing echo acquisition mode (DREAM) sequences, set to a clinically feasible scan time of 5 minutes, were compared in terms of accuracy and precision with electromagnetic and Bloch simulations and MR measurements...
February 8, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30720209/sparsity-and-locally-low-rank-regularization-for-mr-fingerprinting
#17
Gastão Lima da Cruz, Aurélien Bustin, Oliver Jaubert, Torben Schneider, René M Botnar, Claudia Prieto
PURPOSE: Develop a sparse and locally low rank (LLR) regularized reconstruction to accelerate MR fingerprinting (MRF). METHODS: Recent works have introduced low rank reconstructions to MRF, based on temporal compression operators learned from the MRF dictionary. In other MR applications, LLR regularization has been introduced to exploit temporal redundancy in local regions of the image. Here, we propose to include spatial sparsity and LLR regularization terms in the MRF reconstruction...
February 5, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30720206/evaluation-of-principal-component-analysis-image-denoising-on-multi-exponential-mri-relaxometry
#18
Mark D Does, Jonas Lynge Olesen, Kevin D Harkins, Teresa Serradas-Duarte, Daniel F Gochberg, Sune N Jespersen, Noam Shemesh
PURPOSE: Multi-exponential relaxometry is a powerful tool for characterizing tissue, but generally requires high image signal-to-noise ratio (SNR). This work evaluates the use of principal-component-analysis (PCA) denoising to mitigate these SNR demands and improve the precision of relaxometry measures. METHODS: PCA denoising was evaluated using both simulated and experimental MRI data. Bi-exponential transverse relaxation signals were simulated for a wide range of acquisition and sample parameters, and experimental data were acquired from three excised and fixed mouse brains...
February 5, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30714198/echo-planar-time-resolved-imaging-epti
#19
Fuyixue Wang, Zijing Dong, Timothy G Reese, Berkin Bilgic, Mary Katherine Manhard, Jingyuan Chen, Jonathan R Polimeni, Lawrence L Wald, Kawin Setsompop
PURPOSE: To develop an efficient distortion- and blurring-free multi-shot EPI technique for time-resolved multiple-contrast and/or quantitative imaging. METHODS: EPI is a commonly used sequence but suffers from geometric distortions and blurring. Here, we introduce a new multi-shot EPI technique termed echo planar time-resolved imaging (EPTI), which has the ability to rapidly acquire distortion- and blurring-free multi-contrast data set. The EPTI approach performs encoding in ky -t space and uses a new highly accelerated spatio-temporal CAIPI sampling trajectory to take advantage of signal correlation along these dimensions...
February 3, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://read.qxmd.com/read/30714197/automated-selection-of-myocardial-inversion-time-with-a-convolutional-neural-network-spatial-temporal-ensemble-myocardium-inversion-network-stemi-net
#20
Naeim Bahrami, Tara Retson, Kevin Blansit, Kang Wang, Albert Hsiao
PURPOSE: Delayed enhancement imaging is an essential component of cardiac MRI, which is used widely for the evaluation of myocardial scar and viability. The selection of an optimal inversion time (TI) or null point (TINP ) to suppress the background myocardial signal is required. The purpose of this study was to assess the feasibility of automated selection of TINP using a convolutional neural network (CNN). We hypothesized that a CNN may use spatial and temporal imaging characteristics from an inversion-recovery scout to select TINP , without the aid of a human observer...
February 3, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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