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Antenna
 
A device that enables the sending and/or receiving of electromagnetic waves.
See also Transmitter, Receiver Coil and Surface Coil.
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Further Reading:
  News & More:
Patent Issued for Implantable MRI Compatible Stimulation Leads and Antennas and Related Systems and Methods
Thursday, 22 August 2013   by www.hispanicbusiness.com    
Searchterm 'Antenna' was also found in the following service: 
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Radiology  (1) Open this link in a new window
CoilForum -
related threadsInfoSheet: - Coils - 
Intro, 
Overview, 
etc.MRI Resource Directory:
 - Coils -
 
A coil consists of one or more loops of conductive wire, looped around the core of the coil. Coils are part of the hardware of MRI machines and are used to create a magnetic field or to detect a changing magnetic field by voltage induced in the wire. A coil is usually a physically small antenna.
The perfect coil produces a uniform magnetic field without significant radiation.
Different types of MRI coils are used in MR systems:
Gradient coils are used to produce controlled variations in the main magnetic field (B0) to provide spatial localization of the signals and to apply reversal pulses in some imaging techniques.
MR imaging radio frequency coils to receive and/or transmit the RF signal.
Shim coils provide auxiliary magnetic fields in order to compensate for inhomogeneities in the main magnetic field of the MRI machine.
See also Gradient Coil, Radio Frequency Coil, Hardware and Coil Loading.

See also the related poll result: '3rd party coils are better than the original manufacturer coils'
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Further Reading:
  Basics:
PET Attenuation Correction for Rigid MR Tx/Rx Coils From 176Lu Background Activity
Tuesday, 6 February 2018   by www.ncbi.nlm.nih.gov    
Magnetic Field Simulation of Golay Coil(.pdf)
2008   by eprints.utm.my    
  News & More:
High-field MRI Coils – that work, superbly, even at 750 MHz
   by www.dotynmr.com    
New superconducting coil improves MRI performance
Wednesday, 20 July 2016   by www.eurekalert.org    
First European fully superconductive coil reaching a magnetic field of 25 Tesla produced
Wednesday, 8 June 2016   by www.news-medical.net    
November 2014 New Products: Wearable coil facilitates positioning during prostate MRI
Monday, 10 November 2014   by urologytimes.modernmedicine.com    
ScanMed Introduces a Groundbreaking New Orbit and Mandible Array to the MRI Market
Wednesday, 26 March 2014   by www.digitaljournal.com    
MRI coil optimized for imaging of infants gets FDA clearance
Tuesday, 17 April 2012   by www.medcitynews.com    
Low-profile MRI coil company inching toward commercialization
Wednesday, 21 December 2011   by www.medcitynews.com    
High-Resolution Uniform MR Imaging of Finger Joints Using a Dedicated RF Coil at 3 Tesla
Sunday, 31 January 2010   by www.ncbi.nlm.nih.gov    
DOTmed Industry Sector Report: MRI Coil Sales & Service Companies
Thursday, 13 December 2007   by www.dotmed.com    
MRI Resources 
Journals - RIS - Anatomy - Collections - Raman Spectroscopy - Shielding
 
Nuclear Magnetic Resonance Signal
 
The electromagnetic signal in the radio-frequency range produced by the precession of the transverse magnetization of the spins. The rotation of the transverse magnetization induces a voltage in a receiving antenna (coil), which is amplified and demodulated by the receiver circuits. Electromagnetic signal in the radio frequency range produced by the precession of the transverse magnetization of the spins. The rotation of the transverse magnetization induces a voltage in a coil, which is amplified and demodulated by the receiver;; the signal may refer only to this induced voltage.
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Further Reading:
  Basics:
Spin echoes, CPMG and T2 relaxation - Introductory NMR & MRI from Magritek
2013   by www.azom.com    
NMR Spectroscopy - Theory
   by www.shu.ac.uk    
  News & More:
A powder to enhance NMR signals
Thursday, 12 December 2013   by phys.org    
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Radio FrequencyForum -
related threads
 
(RF) Radio frequency refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna.
The RF pulses used in MRI are commonly in the 1-100 megahertz range, and their effect upon a body is potential heating of tissues and foreign bodies, such as metallic implants, mainly at the surface.
This is a principal area of concern for MRI safety limits caused by absorption (see specific absorption rate) of the applied pulses of RF energy.


Image Guidance
The higher the frequency, the larger will be the amount of heat developed.
The more ionic the biochemical environment in the tissue, the more energy that will be deposited as heat.
This effect is well known for homogeneous model systems, but the complex structure of various human tissues makes detailed theoretical calculations very difficult, if not impossible. By scanning problems, it is important to verify the transmission frequency. If the RF transmitted into the patient was, e.g. 5000 Hz lower than the resonance frequency of the protons, no protons was excited, and no signal returns.
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Further Reading:
  Basics:
Radio frequency
   by en.wikipedia.org    
  News & More:
On the estimation of the worst-case implant-induced RF-heating in multi-channel MRI.
Thursday, 2 March 2017   by www.ncbi.nlm.nih.gov    
Numerical investigations of MRI RF field induced heating for external fixation devices
Thursday, 7 February 2013   by 7thspace.com    
Safety and reliability of Radio Frequency Identification Devices in Magnetic Resonance Imaging and Computed Tomography
Thursday, 4 February 2010   by 7thspace.com    
Radiologists Offer Non-surgical Treatment For Early-stage Liver Cancer
Saturday, 5 March 2005   by www.sciencedaily.com    
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Radio Frequency Transmitter
 
In MRI systems the radio frequency (RF) transmitter produces the RF current (oscillator) and delivers it to the transmitting coil (antenna). The RF signal produced by the transmitter is used to excite the protons in the imaging volume.
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Further Reading:
  Basics:
Tech Spotlight: How to calibrate an MRI RF amplifier
Saturday, 1 December 2012   by medicaldesign.com    
MRI Resources 
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