Brain MR imaging at ultra-low radiofrequency power
Subhendra N. Sarkar,David C. Alsop,Ananth J. Madhuranthakam,Reed F. Busse,Philip M. Robson,Neil M. Rofsky,David B. Hackney +6 more
Reads0
Chats0
TLDR
The 3D techniques adopted here led to a decrease in the absorbed RF power by two orders of magnitude at 1.5 T, and still the image quality was preserved within clinically acceptable imaging times.Abstract:
A 100-fold reduction in specific absorption rate (SAR) for brain MR imaging is demonstrated with image quality comparable to clinical high-SAR sequences; this approach may be a high-quality alternative to conventional MR in patients with implants.read more
Citations
More filters
Journal ArticleDOI
Optimized Three-Dimensional Fast-Spin-Echo MRI
TL;DR: These optimized fast/turbo spin‐ echo pulse sequences provide a robust and flexible approach for 3D spin‐echo‐based imaging with a broad range of clinical applications.
Journal ArticleDOI
MR imaging of the fetal brain at 1.5T and 3.0T field strengths: comparing specific absorption rate (SAR) and image quality
Uday Krishnamurthy,Jaladhar Neelavalli,Swati Mody,Lami Yeo,Pavan K. Jella,Sheena Saleem,Steven J. Korzeniewski,M. Cabrera,Shadi Ehterami,Ray O. Bahado-Singh,Yashwanth Katkuri,Ewart Mark Haacke,Edgar Hernandez-Andrade,Sonia S. Hassan,Roberto Romero +14 more
TL;DR: It is possible to obtain fetal brain images with higher resolution and better SNR at 3.0T with simultaneous reduction in SAR compared to 1.5T, and images of the fetal brain obtained at 3-0T demonstrated superior tissue contrast and conspicuityCompared to 1-5T.
Journal ArticleDOI
Post-contrast 3D T1-weighted TSE MR sequences (SPACE, CUBE, VISTA/BRAINVIEW, isoFSE, 3D MVOX): Technical aspects and clinical applications
Blanche Bapst,Jean-Louis Amegnizin,Alexandre Vignaud,Paul Kauv,Anne Maraval,Erwah Kalsoum,Titien Tuilier,Azzedine Benaissa,Pierre Brugières,Xavier Leclerc,Jérôme Hodel +10 more
TL;DR: The purpose of this review was to illustrate the main clinical applications of the post-contrast T1-w 3D TSE sequence through clinical cases, and to discuss the respective role of 3d TSE and GRE imaging in the field of neuroimaging.
Journal ArticleDOI
Optimization of magnetization-prepared 3-dimensional fluid attenuated inversion recovery imaging for lesion detection at 7 T.
Manojkumar Saranathan,Thomas Tourdias,Adam B. Kerr,Jeff D. Bernstein,Geoffrey A. Kerchner,May H. Han,Brian K. Rutt +6 more
TL;DR: A magnetization-prepared FLAIR-Cube with refocusing flip angle trains optimized for SNR and contrast can be used to characterize WM and cortical lesions at 7 T with 0.8 mm3 isotropic resolution in short scan times and without SAR penalty.
Journal ArticleDOI
Specific Absorption Rate and Specific Energy Dose: Comparison of 1.5-T versus 3.0-T Fetal MRI
Christian A. Barrera,Michael L. Francavilla,Suraj D. Serai,J. Christopher Edgar,Camilo Jaimes,Michael S. Gee,Timothy P.L. Roberts,Hansel J. Otero,N. Scott Adzick,Teresa Victoria +9 more
TL;DR: Fetal 1.5- and 3.0-T MRI examinations were found to have equivalent energy metrics in most cases, but some sequences, such as two-dimensional T1-weighted spoiled gradient-echo and three-dimensional steady-state free precession, may require modification to keep the energy delivered to the patient as low as possible.
References
More filters
Journal ArticleDOI
Multiecho imaging sequences with low refocusing flip angles
TL;DR: In this article, a simple algorithm is presented, which permits recognition of all echos occurring in periodic multipulse sequences, and a RARE experiment based on these principles delivers sufficient signal intensity even with small refocusing flip angles.
Journal ArticleDOI
Comprehensive quantification of signal-to-noise ratio and g-factor for image-based and k-space-based parallel imaging reconstructions.
Philip M. Robson,Aaron K. Grant,Ananth J. Madhuranthakam,Riccardo Lattanzi,Daniel K. Sodickson,Charles A. McKenzie +5 more
TL;DR: A simple Monte Carlo based method is proposed for all linear image reconstruction algorithms, which allows measurement of signal‐to‐noise ratio and g‐factor and is demonstrated for SENSE and GRAPPA reconstructions for accelerated acquisitions that have not previously been amenable to such assessment.
Journal ArticleDOI
PROMO: Real-time prospective motion correction in MRI using image-based tracking.
Nathan S. White,Cooper Roddey,Ajit Shankaranarayanan,Eric T. Han,Dan Rettmann,Juan M. Santos,Josh Kuperman,Anders M. Dale +7 more
TL;DR: A new image-based approach for prospective motion correction is described, which utilizes three orthogonal two‐dimensional spiral navigator acquisitions, along with a flexible image‐based tracking method based on the extended Kalman filter algorithm for online motion measurement.
Journal ArticleDOI
Neurostimulation systems for deep brain stimulation: in vitro evaluation of magnetic resonance imaging-related heating at 1.5 tesla.
Ali R. Rezai,Daniel A. Finelli,John A. Nyenhuis,Greg Hrdlicka,Jean A. Tkach,Ashwini Sharan,Paul Rugieri,Paul H. Stypulkowski,Frank G. Shellock +8 more
TL;DR: To assess magnetic resonance imaging (MRI)‐related heating for a neurostimulation system (Activa® Tremor Control System, Medtronic, Minneapolis, MN) used for chronic deep brain stimulation (DBS).
Journal ArticleDOI
Evaluation of specific absorption rate as a dosimeter of MRI-related implant heating.
Kenneth B. Baker,Jean A. Tkach,John A. Nyenhuis,Michael Phillips,Frank G. Shellock,Jorge Gonzalez-Martinez,Ali R. Rezai +6 more
TL;DR: To compare the magnetic resonance imaging (MRI)‐related heating per unit of whole body averaged specific absorption rate (SAR) of a conductive implant exposed to two different 1.5‐Tesla/64 MHz MR systems, two different MR systems were used.