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Related Concept Videos

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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,...
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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...
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Double-row dipole/loop combined array for human whole brain imaging at 7 T.

Nikolai I Avdievich1, Anton V Nikulin1,2, Loreen Ruhm1

  • 1High-Field MR Center, Max Planck Institute for Biological Cybernetics, Tübingen, Germany.

NMR in Biomedicine
|May 17, 2022
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Summary
This summary is machine-generated.

This study introduces a new 32-element hybrid radiofrequency (RF) coil array for 7 Tesla (T) human head imaging. The novel design enhances signal-to-noise ratio (SNR) and radiofrequency (RF) transmit efficiency for better brain imaging.

Keywords:
central SNR improvement, folded-end dipole, human head imaging, hybrid array design, ultra-high field MRI, whole brain coverage

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Area of Science:

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

Background:

  • Designing radiofrequency (RF) coils for ultra-high field (UHF; ≥7 Tesla) human head imaging faces challenges with transmit (Tx) RF field inhomogeneity and longitudinal coverage.
  • Loop-only receive (Rx) arrays may not achieve optimal intrinsic signal-to-noise ratio (UISNR) near the brain center at UHF.
  • Combining complementary conductive structures, like loops and dipoles, can improve Rx performance.

Purpose of the Study:

  • To develop and evaluate a novel 32-element hybrid RF coil array for 7 Tesla (T) human head imaging.
  • To address limitations in RF field homogeneity, coverage, and signal-to-noise ratio (SNR) at UHF MRI.
  • To improve transmit (Tx) efficiency and simplify coil design.

Main Methods:

  • Development and construction of a 32-element hybrid array comprising 16 transceiver loops and 16 Rx-only dipoles.
  • Single-layer element placement to increase RF power deposition and preserve Tx-efficiency.
  • Evaluation of whole brain coverage, 3D RF shimming capability, and SNR performance.

Main Results:

  • The hybrid array demonstrated whole brain coverage and 3D RF shimming capability.
  • Achieved approximately 15% higher SNR near the brain center compared to a commercial head array.
  • Showcased 20% to 40% higher Tx-efficiency, depending on the RF shim mode.

Conclusions:

  • The novel 32-element hybrid array design offers improved SNR and Tx-efficiency for 7T human head MRI.
  • This design facilitates whole brain coverage and 3D RF shimming.
  • The hybrid approach simplifies coil structure while enhancing imaging performance at ultra-high fields.