Cancer recurrence monitoring using hyperpolarized [1-13C]pyruvate metabolic imaging in murine breast cancer model
The purpose of this work was to study the anatomic and metabolic changes that occur with tumor progression, regression and recurrence in a switchable MYC-driven murine breast cancer model. Serial 1H MRI and hyperpolarized [1-13C]pyruvate metabolic imaging were used to investigate the changes in tumor volume and glycolytic metabolism over time during the multistage tumorigenesis. We show that acute de-induction of MYC expression in established tumors results in rapid tumor regression and significantly reduced glycolytic metabolism as measured by pyruvate-to-lactate conversion. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - July 14, 2017 Category: Radiology Authors: Peter J. Shin, Zihan Zhu, Roman Camarda, Robert A. Bok, Alicia Y. Zhou, John Kurhanewicz, Andrei Goga, Daniel B. Vigneron Tags: Original contribution Source Type: research
Trimmed autocalibrating K-space estimation based on structured matrix completion
Parallel imaging allows the reconstruction of undersampled data from multiple coils. This provides a means to reject and regenerate corrupt data (e.g. from motion artefact). The purpose of this work is to approach this problem using the SAKE parallel imaging method. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - July 14, 2017 Category: Radiology Authors: Mark Bydder, Stanislas Rapacchi, Olivier Girard, Maxime Guye, Jean-Philippe Ranjeva Tags: Original contribution Source Type: research
Modified-BRISQUE as no reference image quality assessment for structural MR images
An effective and practical Image Quality Assessment (IQA) model is needed to assess the image quality produced from any new hardware or software in MRI. A highly competitive No Reference – IQA (NR – IQA) model called Blind/Referenceless Image Spatial Quality Evaluator (BRISQUE) initially designed for natural images were modified to evaluate structural MR images. The BRISQUE model measures the image quality by using the locally normalized luminance coefficients, which were used t o calculate the image features. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - July 14, 2017 Category: Radiology Authors: Li Sze Chow, Heshalini Rajagopal Tags: Original contribution Source Type: research
Preparation of an Au-Pt alloy free from artifacts in magnetic resonance imaging
When magnetic resonance imaging (MRI) is performed on patients carrying metallic implants, artifacts can disturb the images around the implants, often making it difficult to interpret them appropriately. However, metallic materials are and will be indispensable as raw materials for medical devices because of their electric conductivity, visibility under X-ray fluoroscopy, and other favorable features. What is now desired is to develop a metallic material which causes no artifacts during MRI. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - July 9, 2017 Category: Radiology Authors: Tomonobu Kodama, Ryusuke Nakai, Kenji Goto, Kunihiro Shima, Hiroo Iwata Tags: Original contribution Source Type: research
The effect of radiotherapy on fat content and fatty acids in myxoid liposarcomas quantified by MRI
Myxoid liposarcomas are highly radiosensitive. Consequently radiotherapy is often used pre-operatively to reduce tumor volume and lessen the post-operative deficit. In soft-tissue sarcomas therapy response is mainly evaluated using magnetic resonance imaging (MRI) and the fundamental criterion for a positive response is decreased tumor size. In myxoid liposarcomas an increased fat content is also known to occur as a response to radiotherapy. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - July 8, 2017 Category: Radiology Authors: Skorpil Mikael, Ryd én Henric, Wejde Johan, Lidbrink Elisabet, Brosjö Otte, Berglund Johan Source Type: research
Multi-frequency interpolation in spiral magnetic resonance fingerprinting for correction of off-resonance blurring
Magnetic resonance fingerprinting (MRF) pulse sequences often employ spiral trajectories for data readout. Spiral k-space acquisitions are vulnerable to blurring in the spatial domain in the presence of static field off-resonance. This work describes a blurring correction algorithm for use in spiral MRF and demonstrates its effectiveness in phantom and in vivo experiments. Results show that image quality of T1 and T2 parametric maps is improved by application of this correction. This MRF correction has negligible effect on the concordance correlation coefficient and improves coefficient of variation in regions of off-reson...
Source: Magnetic Resonance Imaging - July 7, 2017 Category: Radiology Authors: Jason Ostenson, Ryan K. Robison, Nicholas R. Zwart, E. Brian Welch Source Type: research
Non-contrast-enhanced 3D MR portography within a breath-hold using compressed sensing acceleration: A prospective noninferiority study
To evaluate images of non-contrast-enhanced 3D MR portography within a breath-hold (BH) using compressed sensing (CS) compared to standard respiratory-triggered (RT) sequences. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - July 5, 2017 Category: Radiology Authors: Ayako Ono, Shigeki Arizono, Koji Fujimoto, Thai Akasaka, Rikiya Yamashita, Akihiro Furuta, Hiroyoshi Isoda, Kaori Togashi Tags: Original contribution Source Type: research
Left-ventricular mechanics in children with hypertrophic cardiomyopathy. CMR study
To assess the magnitude of myocardial displacement abnormalities and their alterations with the fibrosis, left-ventricular (LV) outflow tract obstruction (LVOTO) and hypertrophy in juveniles with hypertrophic cardiomyopathy (HCM).Study design.Fifty-five children [age 12,5 ±4.6years, 38 (69,1%) males, 19 (34,5%) with LVOTO] with HCM and 20 controls underwent cardiovascular magnetic resonance. The LV feature tracking (FT) derived strain and strain rates were quantified. Results of FT analysis were compared between HCM subjects and controls and between children with an d without LVOTO. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - July 5, 2017 Category: Radiology Authors: Łukasz Mazurkiewicz, Lidia Ziółkowska, Joanna Petryka, Mateusz Śpiewak, Łukasz Małek, Agata Kubik, Magdalena Marczak, Jolanta Misko, Grażyna Brzezińska-Rajszys Tags: Original contribution Source Type: research
Left ventricular volume measurements with free breathing respiratory self-gated 3-dimensional golden angle radial whole-heart cine imaging – Feasibility and reproducibility
To develop and evaluate a free breathing respiratory self-gated isotropic resolution technique for left ventricular (LV) volume measurements. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - July 4, 2017 Category: Radiology Authors: Karen Holst, Martin Ugander, Andreas Sigfridsson Tags: Original contribution Source Type: research
Towards predicting the encoding capability of MR fingerprinting sequences
Sequence optimization and appropriate sequence selection is still an unmet need in magnetic resonance fingerprinting (MRF). The main challenge in MRF sequence design is the lack of an appropriate measure of the sequence's encoding capability. To find such a measure, three different candidates for judging the encoding capability have been investigated: local and global dot-product-based measures judging dictionary entry similarity as well as a Monte Carlo method that evaluates the noise propagation properties of an MRF sequence. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - July 3, 2017 Category: Radiology Authors: K. Sommer, T. Amthor, M. Doneva, P. Koken, J. Meineke, P. B örnert Source Type: research
Finite Element Analysis to Investigate Variability of MR Elastography in the Human Thigh
Purpose: To develop finite element analysis (FEA) of magnetic resonance elastography (MRE) in the human thigh and investigate inter-individual variability of measurement of muscle mechanical properties.Methods: Segmentation was performed on MRI datasets of the human thigh from 5 individuals and FEA models consisting of 12 muscles and surrounding tissue created. The same material properties were applied to each tissue type and a previously developed transient FEA method of simulating MRE using Abaqus was performed at 4 frequencies. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - June 29, 2017 Category: Radiology Authors: L. Hollis, E. Barnhill, M. Perrins, P. Kennedy, N. Conlisk, C. Brown, P.R. Hoskins, P. Pankaj, N. Roberts Source Type: research
Magnetic Resonance Fingerprinting with Short Relaxation Intervals
To investigate a technique for improving the performance of Magnetic Resonance Fingerprinting (MRF) in repetitive sampling schemes, especially suited for 3D MRF acquisition, by shortening relaxation intervals between MRF pulse train repetitions. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - June 27, 2017 Category: Radiology Authors: Thomas Amthor, Mariya Doneva, Peter Koken, Karsten Sommer, Jakob Meineke, Peter B örnert Source Type: research
Radiological studies of fetal alcohol spectrum disorders in humans and animal models: An updated comprehensive review
Fetal Alcohol Spectrum Disorders encompass a wide range of birth defects in children born to mothers who consumed alcohol during pregnancy. Typical mental impairments in FASD include difficulties in life adaptation and learning and memory, deficits in attention, visuospatial skills, language and speech disabilities, mood disorders and motor disabilities. Multimodal imaging methods have enabled in vivo studies of the teratogenic effects of alcohol on the central nervous system, giving more insight into the FASD phenotype. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - June 20, 2017 Category: Radiology Authors: Van T. Nguyen, Suyinn Chong, Quang M. Tieng, Karine Mardon, Graham J. Galloway, Nyoman D. Kurniawan Source Type: research
Clinical high-resolution mapping of the proteoglycan-bound water fraction in articular cartilage of the human knee joint
We applied a recently introduced method to achieve clinically-feasible in-vivo mapping of the proteoglycan water fraction (PgWF) of human knee cartilage with improved spatial resolution and stability as compared to existing methods. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - June 20, 2017 Category: Radiology Authors: Mustapha Bouhrara, David A. Reiter, Kyle W. Sexton, Christopher M. Bergeron, Linda M. Zukley, Richard G. Spencer Tags: Original contribution Source Type: research
Quantifying left atrial structure and function using single-plane tissue-tracking cardiac magnetic resonance
Left atrial (LA) structure and function are important markers of adverse cardiovascular outcomes. Tissue-tracking cardiovascular magnetic resonance (CMR) accurately quantifies LA volume, strain, and strain rate based on biplane long-axis imaging. We aimed to assess the accuracy of the LA indices quantification from single-plane tissue-tracking CMR. (Source: Magnetic Resonance Imaging)
Source: Magnetic Resonance Imaging - June 19, 2017 Category: Radiology Authors: Susumu Tao, Luisa A. Ciuffo, Joao A.C. Lima, Katherine C. Wu, Hiroshi Ashikaga Tags: Original contribution Source Type: research
