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Related Concept Videos

Brain Imaging01:14

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).
Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
Positron Emission Tomography01:29

Positron Emission Tomography

Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...

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Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
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Published on: February 19, 2021

A conformal transceive array for 7 T neuroimaging.

Kyle M Gilbert1, Jean-Guy Belliveau, Andrew T Curtis

  • 1Robarts Research Institute, The University of Western Ontario, London, Ontario, Canada. kgilbert@imaging.robarts.ca

Magnetic Resonance in Medicine
|December 23, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces the first 16-channel head coil for 7T MRI, improving signal-to-noise ratio and enabling high-resolution brain imaging. Its conformal design enhances cortical imaging for neuroscience research.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Neuroscience

Background:

  • High-field MRI (7T) offers enhanced signal but faces challenges with radiofrequency (RF) field homogeneity and coil design.
  • Existing surface coils often lack optimal conformity to the human head, limiting signal-to-noise ratio (SNR) in peripheral regions.

Purpose of the Study:

  • To develop and characterize the first 16-channel transceive surface-coil array specifically designed to conform to the human head for 7T MRI.
  • To evaluate the RF performance, SNR, and parallel imaging capabilities of this novel conformal coil array.

Main Methods:

  • A 16-channel transceive surface-coil array was constructed with individual element decoupling using circumferential shields.
  • Radiofrequency (RF) shimming was employed to achieve transmit-field uniformity.
  • Coil performance was assessed by measuring transmit-field uniformity, power requirements, SNR in peripheral regions, and geometry factors for parallel imaging.

Main Results:

  • The conformal coil achieved transmit-field uniformity of 20% (whole brain) and 14% (single slice).
  • Reduced RF power was required due to tight coupling with the head, enabling shorter pulse lengths.
  • Enhanced SNR was observed in the brain periphery, particularly superiorly, with low geometry factors (mean 1.04/1.06) supporting high parallel imaging acceleration (3x3).

Conclusions:

  • The novel 16-channel conformal head coil array provides excellent RF performance and high SNR at 7T.
  • Its design is ideal for studying cortical architecture and function with high temporal and spatial resolution using parallel imaging techniques.