Guttman, Michael A Tao, Susumu Fink, Sarah Tunin, Rick Schmidt, Ehud J Herzka, Daniel A Halperin, Henry R Kolandaivelu, Aravindan
Published in
Magnetic resonance in medicine
To evaluate non-contrast-enhanced MRI of acute radio-frequency ablation (RFA) lesions in the left atrium (LA) and pulmonary vein (PV) ostia. The goal is to provide a method for discrimination between necrotic (permanent) lesions and reversible injury, which is associated with recurrence after treatment of atrial fibrillation. Fifteen normal swine u...
Zhu, Xucheng Chan, Marilynn Lustig, Michael Johnson, Kevin M Larson, Peder E Z
Published in
Magnetic resonance in medicine
To develop a high-scanning efficiency, motion-corrected imaging strategy for free-breathing pulmonary MRI by combining an iterative motion-compensation reconstruction with a ultrashort echo time (UTE) acquisition called iMoCo UTE. An optimized golden-angle ordering radial UTE sequence was used to continuously acquire data for 5 minutes. All readout...
Gurney-Champion, Oliver J Rauh, Susanne S Harrington, Kevin Oelfke, Uwe Laun, Frederik B Wetscherek, Andreas
Published in
Magnetic resonance in medicine
Flow-compensated (FC) diffusion-weighted MRI (DWI) for intravoxel-incoherent motion (IVIM) modeling allows for a more detailed description of tissue microvasculature than conventional IVIM. The long acquisition time of current FC-IVIM protocols, however, has prohibited clinical application. Therefore, we developed an optimized abdominal FC-IVIM acq...
Schauman, S Sophie Chiew, Mark Okell, Thomas W
Published in
Magnetic resonance in medicine
To demonstrate that vessel selectivity in dynamic arterial spin labeling angiography can be achieved without any scan-time penalty or noticeable loss of image quality compared with conventional arterial spin labeling angiography. Simulations on a numerical phantom were used to assess whether the increased sparsity of vessel-encoded angiograms compa...
Bustin, Aurélien Milotta, Giorgia Ismail, Tevfik F Neji, Radhouene Botnar, René M Prieto, Claudia
Published in
Magnetic resonance in medicine
To enable free-breathing whole-heart 3D T2 mapping with high isotropic resolution in a clinically feasible and predictable scan time. This 3D motion-corrected undersampled signal matched (MUST) T2 map is achieved by combining an undersampled motion-compensated T2 -prepared Cartesian acquisition with a high-order patch-based reconstruction. The 3D M...
Malik, Shaihan J Teixeira, Rui P A G West, Daniel J Wood, Tobias C Hajnal, Joseph V
Published in
Magnetic resonance in medicine
Inhomogeneous magnetization transfer (ihMT) is an emerging form of MRI contrast that may offer high specificity for myelinated tissue. Existing ihMT and pulsed MT sequences often use separate radiofrequency pulses for saturation and signal excitation. This study investigates the use of nonselective multiband radiofrequency pulses for simultaneous o...
Byra, Michal Wu, Mei Zhang, Xiaodong Jang, Hyungseok Ma, Ya-Jun Chang, Eric Y Shah, Sameer Du, Jiang
Published in
Magnetic resonance in medicine
To develop a deep learning-based method for knee menisci segmentation in 3D ultrashort echo time (UTE) cones MR imaging, and to automatically determine MR relaxation times, namely the T1, T1ρ , and T 2 ∗ parameters, which can be used to assess knee osteoarthritis (OA). Whole knee joint imaging was performed using 3D UTE cones sequences to collect d...
Liu, Xiaoyang Ellens, Nicholas Williams, Emery Burdette, Everette C Karmarkar, Parag Weiss, Clifford R Kraitchman, Dara Bottomley, Paul A
Published in
Magnetic resonance in medicine
To develop and test in animal studies ex vivo and in vivo, an intravascular (IV) MRI-guided high-intensity focused ultrasound (HIFU) ablation method for targeting perivascular pathology with minimal injury to the vessel wall. IV-MRI antennas were combined with 2- to 4-mm diameter water-cooled IV-ultrasound ablation catheters for IV-MRI on a 3T clin...
Rallapalli, Harikrishna Tan, I-Li Volkova, Eugenia Wojcinski, Alexandre Darwin, Benjamin C Lerch, Jason P Joyner, Alexandra L Turnbull, Daniel H
Published in
Magnetic resonance in medicine
Genetically engineered mouse models of sporadic cancers are critical for studying tumor biology and for preclinical testing of therapeutics. We present an MRI-based pipeline designed to produce high resolution, quantitative information about tumor progression and response to novel therapies in mouse models of medulloblastoma (MB). Sporadic MB was m...
Landes, Vanessa L Nayak, Krishna S
Published in
Magnetic resonance in medicine
To develop and evaluate a method for RF envelope correction without extra hardware or synchronization. Transmitted RF waveforms are measured through a simple pulse sequence called the gradient reversal approach to evaluate RF (GRATER). The measured RF waveforms are used to compute predistorted RF waveforms. This process is repeated until a stopping...
