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Related Concept Videos

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 for Cardiovascular System III: X-Ray01:20

Imaging Studies for Cardiovascular System III: X-Ray

The most common cardiovascular diagnostic test is an X-ray. It produces images of the heart, blood vessels, and adjacent structures.
Definition and Purpose
An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...
Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
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,...
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...

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Cardiac Magnetic Resonance Imaging at 7 Tesla
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An 8-Channel Transceiver Coil for Carotid Artery Imaging at 7T Using an Optimized Shield Design.

Pedram Yazdanbakhsh, Marcus Couch, Kyle M Gilbert

    IEEE Transactions on Bio-Medical Engineering
    |March 21, 2024
    PubMed
    Summary

    This study optimized radiofrequency (RF) coil shielding for 7T MRI of carotid arteries, significantly improving transmit performance and safety. The new design enhances B1+ efficiency and specific absorption rate (SAR) efficiency for better imaging.

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    Area of Science:

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

    Background:

    • High-field MRI (7T) offers superior image quality but faces challenges in transmit performance and safety.
    • Carotid artery imaging requires specialized RF coil arrays for optimal visualization.
    • Parallel transmit (pTx) technology enhances MRI capabilities but necessitates careful coil design and shielding.

    Purpose of the Study:

    • To design and fabricate a novel transmit/receive (T/R) RF coil array for 7T MRI of the carotid arteries.
    • To optimize RF shielding to enhance transmit performance in parallel transmit (pTx) mode.
    • To ensure safety by managing specific absorption rate (SAR) during pTx operation.

    Main Methods:

    • An 8-element bilateral carotid coil array with RF shields was designed.
    • Electromagnetic (EM) simulations were used to determine optimal RF shield distance for improved transmit efficiency and SAR.
    • Coil performance was evaluated using phantom imaging and in-vivo scans.

    Main Results:

    • The optimal RF shield distance was found to be 45 mm.
    • The optimized coil achieved a maximum B1+ efficiency of 1.23 μT/√W and a peak SAR of 0.86 kg⁻¹/W.
    • Compared to an unshielded design, the optimized RF shield improved B1+ efficiency by up to 37% and SAR efficiency by 14%.

    Conclusions:

    • Optimizing RF shield distance significantly enhances the transmit characteristics of bilateral carotid RF coils.
    • This optimized coil design presents a robust platform for high-field MRI of the carotid arteries.
    • The improved efficiency and safety profile support advanced carotid imaging applications.