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Magnetic Resonance Imaging01:24

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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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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
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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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Updated: Sep 27, 2025

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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Basic Principles of and Practical Guide to Clinical MRI Radiofrequency Coils.

Wingchi E Kwok1

  • 1From the Department of Imaging Sciences, University of Rochester, 601 Elmwood Ave, Rochester, NY 14642; and University of Rochester Center for Advanced Brain Imaging and Neurophysiology, Rochester, NY.

Radiographics : a Review Publication of the Radiological Society of North America, Inc
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Summary

Radiofrequency (RF) coils are crucial for MRI image quality and safety. Understanding their function, proper use, and quality control is essential for optimal imaging and preventing patient harm.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology
  • Biophysics

Background:

  • Radiofrequency (RF) coils are fundamental components in Magnetic Resonance Imaging (MRI).
  • They are responsible for transmitting RF fields to excite nuclear spins and receiving the MRI signal.
  • RF coils significantly impact image quality, affecting signal-to-noise ratio, uniformity, and resolution, but can also cause artifacts and RF heating.

Purpose of the Study:

  • To elucidate the fundamental principles of RF coil design and function in clinical MRI.
  • To highlight the importance of proper RF coil selection and usage for optimal image quality and patient safety.
  • To emphasize the necessity of effective RF coil quality control for reliable MRI operation.

Main Methods:

  • Review of basic principles of RF coil operation and design.
  • Discussion of common clinical MRI coil configurations and anatomy.
  • Exploration of RF coil-related artifacts, safety concerns (e.g., RF heating), and quality control methods.

Main Results:

  • Knowledge of RF coil principles aids in understanding their use and safety implications.
  • Appropriate coil selection and application, especially with techniques like parallel imaging, are key to high-quality MRI and artifact prevention.
  • Effective identification and management of RF coil issues are vital for efficient clinical MRI.

Conclusions:

  • Proper understanding and application of RF coils are essential for maximizing MRI image quality and patient safety.
  • Regular quality control using appropriate phantom tests ensures consistent performance and diagnostic accuracy.
  • Addressing RF coil challenges proactively improves the efficiency and reliability of clinical MRI services.