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MRI Sequences
  • Intro / Overview 1
 
  
Pulse Sequence 
A pulse sequence is a preselected set of defined RF and gradient pulses, usually repeated many times during a scan, wherein the time interval between pulses and the amplitude and shape of the gradient waveforms will control NMR signal reception and affect the characteristics of the MR images. Pulse sequences are computer programs that control all hardware aspects of the MRI measurement process.
Usual to describe pulse sequences, is to list the repetition time (TR), the echo time (TE), if using inversion recovery, the inversion time (TI) with all times given in milliseconds, and in case of a gradient echo sequence, the flip angle. For example, 3000/30/1000 would indicate an inversion recovery pulse sequence with TR of 3000 msec., TE of 30 msec., and TI of 1000 msec.
Specific pulse sequence weightings are dependent on the field strength, the manufacturer and the pathology.
See also Interpulse Times.

• View the NEWS results for 'Pulse Sequence' (1).Open this link in a new window.

• View the DATABASE results for 'Pulse Sequence' (96).Open this link in a new window

 
Further Reading:
  Basics:
MYELIN-SELECTIVE MRI: PULSE SEQUENCE DESIGN AND OPTIMIZATION
   by www.imaging.robarts.ca    
Faster speed, better spatial resolution lead 3T benefits
   by sipi.usc.edu    
  News & More:
New MR sequence helps radiologists more accurately evaluate abnormalities of the uterus and ovaries
Thursday, 23 April 2009   by www.eurekalert.org    
Spin Echo Sequence
     Dual Echo Sequence
     Modified Spin Echo
     Multi Echo Multiplanar
     Partial Saturation Spin Echo
     Variable Echo Multiplanar
Fast Spin Echo
     Carr Purcell Sequence
     Carr Purcell Meiboom Gill Sequence
     Double Fast Spin Echo
     Double Turbo Spin Echo
     Dual Echo Fast Acquisition Interleaved Spin Echo
     Half Fourier Acquisition Single Shot Turbo Spin Echo
     Multiple Echo Single Shot
     Rapid Acquisition with Refocused Echoes
     Turbo Spin Echo
     Ultrashort Turbo Spin Echo
Inversion Recovery Sequence
     Flow Sensitive Alternating Inversion Recovery
     Fluid Attenuation Inversion Recovery
     Inversion Recovery Spin Echo
     Short T1 Inversion Recovery
     Turbo Inversion Recovery
  Sequences - Overview 2 top

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- Thomas Jefferson
 
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