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Dephasing Gradient
 
Magnetic field gradient pulse used to create spatial variation of phase of transverse magnetization. For example, it may be applied prior to signal detection in the presence of a magnetic field gradient with opposite polarity (or of the same polarity if separated by a refocusing RF pulse) so that the resulting gradient echo signal will represent a more complete sampling of the Fourier transformation of the desired image.

See also Spoiler Gradient Pulse.
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• View the DATABASE results for 'Dephasing Gradient' (6).Open this link in a new window

 
Further Reading:
  Basics:
RARE
Monday, 3 December 2012   by www2.warwick.ac.uk    
Depth Pulses
 
Use of multiple RF pulses with an inhomogeneous RF field to enable acquiring data from only selected regions within the field. This provides a 'one-dimensional' localization along isocontours of the B1 field.
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• View the DATABASE results for 'Depth Pulses' (3).Open this link in a new window

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Depth Resolved SpectroscopyInfoSheet: - Sequences -
Intro, Overview, 
Types of, 
etc.MRI Resource Directory:
 - Spectroscopy pool -
 
(DRESS) Depth resolved surface spectroscopy is a localization method that employ gradients to select the region from which spectra are acquired.
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• View the DATABASE results for 'Depth Resolved Spectroscopy' (2).Open this link in a new window

Detector
 
Part of the receiver that demodulates the RF signal and converts it to a lower frequency signal. Most detectors are phase sensitive (e.g., quadrature detector / demodulator) and will also give phase information about the RF signal.
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• View the NEWS results for 'Detector' (1).Open this link in a new window.

• View the DATABASE results for 'Detector' (16).Open this link in a new window

 
Further Reading:
  News & More:
A detector you can wear
Thursday, 23 August 2012   by phys.org    
Ultrasensitive Detector Pinpoints Big Problem in Tiny Fetal Heart
Tuesday, 6 April 2010   by www.sciencedaily.com    
More and More States Adopt Requirements for Ferromagnetic Detectors for MRI Safety
Monday, 19 March 2012   by www.pr.com    
Developing Agent
 
Chemical, usually phenidone, hydroquinone or metole, which reduces exposed silver ions to atomic silver.
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MRI is trending to low field magnets :
reduced costs will lead to this change 
AI will close the gap to high field 
only in remote areas 
is only temporary 
never 

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