Advertisement

Topics

Parallel Transmission for Ultrahigh Field MRI.

08:00 EDT 1st June 2019 | BioPortfolio

Summary of "Parallel Transmission for Ultrahigh Field MRI."

Magnetic resonance imaging (MRI) has been driven toward ultrahigh magnetic fields (UHF) in order to benefit from correspondingly higher signal-to-noise ratio and spectral resolution. Technological challenges associated with UHF, such as increased radiofrequency (RF) energy deposition and RF excitation inhomogeneity, limit realization of the full potential of these benefits. Parallel RF transmission (pTx) enables decreases in the inhomogeneity of RF excitations and in RF energy deposition by using multiple-transmit RF coils driven independently and operating simultaneously. pTx plays a fundamental role in UHF MRI by bringing the potential applications of UHF into reality. In this review article, we review the recent developments in pTx pulse design and RF safety in pTx. Simultaneous multislice imaging and inner volume imaging using pTx are reviewed with a focus on UHF applications. Emerging pTx design approaches using improved pTx design frameworks and calibrations are reviewed together with calibration-free approaches that remove the necessity of time-consuming calibrations necessary for successful pTx. Lastly, we focus on the safety of pTx that is improved by using intersubject variability analysis, proactively managing pTx and temperature-based pTx approaches.

Affiliation

Journal Details

This article was published in the following journal.

Name: Topics in magnetic resonance imaging : TMRI
ISSN: 1536-1004
Pages: 159-171

Links

DeepDyve research library

PubMed Articles [9107 Associated PubMed Articles listed on BioPortfolio]

7.0T ultrahigh-field MRI directly visualized the pedunculopontine nucleus in Parkinson's disease patients.

The pedunculopontine nucleus (PPN) is considered a promising new target for neurostimulation in Parkinson's disease (PD) patients with postural instability and gait disturbance that is refractory to o...

Time-of-flight angiography at 7T using TONE double spokes with parallel transmission.

To demonstrate that fast-k spokes can be used in parallel transmission to homogenize flip angle ramp profiles (known as TONE) in slab selections, and thereby improve Time-Of-Flight angiography of the ...

Tunable optical transmission of magnetic microsphere colloids.

We demonstrate the tunable transmission of core-shell magnetic microsphere colloids (MMC) and report its modeling by effective medium approximation (EMA). Transmission from the MMC was measured experi...

A 0.5-T pure-in-plane-field magnetizing holder for in-situ Lorentz microscopy.

A side-entry specimen holder capable of applying a 0.5-tesla in-plane magnetic-induction field for in-situ transmission electron microscopy was developed. Three miniaturized electromagnets with 300 ...

Parallel molecular evolution and adaptation in viruses.

Parallel molecular evolution is the independent evolution of the same genotype or phenotype from distinct ancestors. The simple genomes and rapid evolution of many viruses mean they are useful model s...

Clinical Trials [3792 Associated Clinical Trials listed on BioPortfolio]

A Study to Confirm the Safety of High Frequency DRG Stimulator in Patients With Chronic Lower Limb Pain

This study is a prospective, single-arm, open label, single center pilot study to confirm the safety of a ultrahigh frequency DRG stimulator in patients with chronic lower limb pain. The a...

Ultrahigh-resolution Optical Coherence Tomography Imaging of the Anterior Eye Segment Structures

The development of optical coherence tomography (OCT) and its application for in vivo imaging has opened entirely new opportunities in ophthalmology (Wojtkowski, Kaluzny et al. 2012; Drexl...

BlueSync Field Evaluation

The purpose of this field evaluation is to collect and evaluate information related to CareLink transmission compliance as well as patient perceived benefit of BlueSync™ and the health c...

Prospective Observational Cohort Study on Mother to Child Transmission HIV1/HIV2 and Prevention

The purpose of this study is to describe over time the rate of mother to child transmission of HIV and its prevention (PMTCT), to identify risk factors for transmission and to evaluate the...

Anterior Segment Imaging With Ultrahigh-resolution OCT in Patients With Glaucoma and PEX - a Pilot Study

The aim of the present study is to develop a measurement protocol for optimal imaging of the anterior segment of the eye, including anterior chamber angle, Schlemm's canal, filtering bleb ...

Medical and Biotech [MESH] Definitions

That portion of the electromagnetic spectrum from the UHF (ultrahigh frequency) radio waves and extending into the INFRARED RAYS frequencies.

The transmission of infectious disease or pathogens. When transmission is within the same species, the mode can be horizontal or vertical (INFECTIOUS DISEASE TRANSMISSION, VERTICAL).

Devices for accelerating charged particles in a spiral path by a constant-frequency alternating electric field. This electric field is synchronized with the movement of the particles in a constant magnetic field.

The transmission of infectious disease or pathogens from one generation to another. It includes transmission in utero or intrapartum by exposure to blood and secretions, and postpartum exposure via breastfeeding.

The transmission of infectious disease or pathogens from patients to health professionals or health care workers. It includes transmission via direct or indirect exposure to bacterial, fungal, parasitic, or viral agents.

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Relevant Topic

Radiology
Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...


Searches Linking to this Article