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Transmitter
 
The portion of the MRI system that produces the RF current 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. Phase sensitive detectors (electronic device in which the output is dependent on the instantaneous difference in phase between two input signals) form part of the frequency synthesis pathway.
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• Related Searches:
    • Absorbed Dose
    • Decoupling
    • Signal Intensity
    • Specific Absorption Rate
    • Receiver
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Transmitter CoilMRI Resource Directory:
 - Coils -
 
The coil of the RF transmitter, inside the MR imager is used in excitation of the spins. Also called transmit-only coil it is used to create the B1 field. As a radio frequency generator send this coil bursts of RF pulses. These pulses serve to disturb the spins in the patient.
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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    
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Absorbed Dose
 
This dose means the RF power absorbed per unit of mass of an object, and is measured in watts per kilogram (W/kg).
The absorbed dose is dependent on the duty cycle and transmitter-coil type and increases with field strength, radio frequency power and and body size.
The specific absorption rate (SAR) describes the potential for heating of the patient's tissue due to the application of the RF energy necessary to produce the MR signal.
See also Specific Absorption Rate, MRI Safety, and MRI Risks.
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Further Reading:
  Basics:
Physics of MRI Safety
   by www.aapm.org    
  News & More:
Commission delays electromagnetic fields legislation
Monday, 29 October 2007   by cordis.europa.eu:80    
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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    
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