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Echo Planar Imaging Factor
 
(EPI Factor) The imaging speed in Echo Planar Imaging (EPI) depends on many factors. Single shot EPI should provide images within 100 ms or less. Because of this limitations, a multi shot EPI approach is in most cases preferred. The parameter 'EPI Factor' is used to specify the number of k-space profiles collected per excitation.
The EPI factor 64 means a measurement time 64 times faster than a normal gradient echo sequence. See also Echo Planar Imaging.
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Further Reading:
  Basics:
Echo Planar Imaging at 4 Tesla With Minimum Acoustic Noise(.pdf)
   by www.bnl.gov    
Echo-planar imaging (EPI) and functional MRI(.pdf)
1998   by www.uib.no    
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Fast Spoiled Gradient EchoInfoSheet: - Sequences - 
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Overview, 
Types of, 
etc.
 
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3-D VOLUMETRIC IMAGING FOR STEREOTACTIC LESIONAL AND DEEP BRAIN STIMULATION SURGERY
MRI Resources 
Quality Advice - Calculation - General - Education pool - Contrast Enhanced MRI - Non-English
 
Gradient Echo SpectroscopyInfoSheet: - Sequences - 
Intro, 
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etc.MRI Resource Directory:
 - Spectroscopy pool -
 
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Ultrashort Turbo Spin EchoInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:
 - Sequences -
 
(UTSE) The ultrashort turbo spin echo (TSE / FSE) sequence is a technique with extremely short echo spacing, resulting in shorter scan times. This is an advantage in areas where motion is a problem, for example dynamic or abdominal imaging. The shorter scan time and echo spacing are achieved by using a higher TSE factor and an increased data sampling rate.
Disadvantages are the decrease in SNR (caused through the increase of the bandwidth) and artifacts if minimum echo spacing is used (incomplete dephasing of the 180° pulse FID).

See also Fast Spin Echo.
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Further Reading:
  News & More:
Ultrashort echo time (UTE) MRI of the spine in thalassaemia
February 2004   by bjr.birjournals.org    
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Blipped Echo Planar Imaging
 
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New Imaging Method Makes Brain Scans 7 Times Faster
Sunday, 9 January 2011   by www.dailytech.com    
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