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 'Pulse Sequence' 
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Result : Searchterm 'Pulse Sequence' found in 5 terms [] and 166 definitions []
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Gradient Echo Multi SliceInfoSheet: - Sequences - 
Intro, 
Overview, 
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etc.
 
(GEMS) This pulse sequence uses a changeable flip angle instead of a 90° pulse and a gradient instead of a RF pulse to rephase the FID.
T2*, T1 weighted and proton density images can be acquired. The flip angle in combination with the TR determines the T1 weighting and the TE controls the amount of dephasing. To minimize T2* the echo time should be short.
See also Gradient Echo Sequence.
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Ultrasound  (1) Open this link in a new window
Gradient Moment Nulling
 
Gradient moment nulling used as motion artifact suppression technique (MAST) reduces constant velocity motion distortion in standard spin echo or gradient echo pulse sequences. It is an adjustment to zero at the echo time (TE) of the net moments of the amplitude of the waveform of the magnetic field gradients with time. The zeroth moment is the area under the curve. The first moment is the 'center of gravity' etc.
The aim is to minimize the phase shifts acquired by the transverse magnetization of excited nuclei moving along the gradients (including the effect of refocusing radio frequency pulses), particularly for the reduction of image artifacts due to motion.
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Further Reading:
  Basics:
Motion Compensation in MR Imaging
   by ccn.ucla.edu    
Motion Compensation in MR Imaging
   by ccn.ucla.edu    
MRI Resources 
Hospitals - Supplies - Equipment - Knee MRI - Cardiovascular Imaging - Journals
 
Gradient and Spin EchoInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.
 
(GRASE) A hybrid sequence with a combination of gradient and spin echo sequences. If multiple image lines are obtained during a single echo, the imaging pulse sequence type is a GRASE sequence.
See Gradient Echo Sequence and Spin Echo Sequence.
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Further Reading:
  Basics:
GRASE (Gradient- and Spin-Echo) MR of the Brain
   by www.ajnr.org    
  News & More:
Sequence for Philips(.pdf)
   by www.droid.cuhk.edu.hk    
Searchterm 'Pulse Sequence' was also found in the following services: 
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Hahn Echo
 
Production of spin echo by repeated RF pulses. First observed using equal (90°) RF pulses, now commonly used to describe refocusing of transverse magnetization by a 180° RF pulse. By choosing long echo delay times, the spins in a Hahn echo first dephase for a long time, then rephase, which makes the Hahn pulse sequence more susceptible to diffusion effects.
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Further Reading:
  Basics:
Magnetic resonance imaging
   by www.scholarpedia.org    
Searchterm 'Pulse Sequence' was also found in the following service: 
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Half Fourier Acquisition Single Shot Turbo Spin EchoInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:
 - Sequences -
 
(HASTE) A pulse sequence with data acquisition after an initial preparation pulse for contrast enhancement with the use of a very long echo train (Single shot TSE), whereat each echo is individually phase encoded. This technique is a heavily T2 weighted, high speed sequence with partial Fourier technique, a great sensitivity for fluid detection and a fast acquisition time of about 1 sec per slice. This advantage makes it possible for using breath-hold with excellent motionless MRI, e.g. used for liver and lung imaging.
See also Segmented HASTE.
 
Images, Movies, Sliders:
 Anatomic Imaging of the Lungs  Open this link in a new window
      

Courtesy of  Robert R. Edelman
 Fetus (Brain) and Dermoid in Mother  Open this link in a new window
      

Courtesy of  Robert R. Edelman

 
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Further Reading:
  News & More:
EVALUATION OF HUMAN STROKE BY MR IMAGING
2000
The cerebello-pontine angle, ACNR • VOLUME 2 NUMBER 3, Page 16
2002
MRI Resources 
Contrast Agents - Examinations - Functional MRI - Image Quality - Cardiovascular Imaging - Contrast Enhanced MRI
 
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