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Partial Echo
 
(PE) The partial echo technique (also called fractional echo) is used to shorten the minimum echo time. By the acquisition of only a part of k-space data this technique benefits (like all partial Fourier techniques) from the complex conjugate symmetry between the k-space halves (this is called Hermitian symmetry).
The dephasing gradient in the frequency direction is reduced, and the duration of the readout gradient and the data acquisition window are shortened. Partial echo gives a better SNR at a given TE when a smaller FOV or thinner slices are selected, allows a longer sampling time, and a larger water fat shift (WFS, see also bandwidth) due to a lower gradient amplitude. The resolution is not affected. This is often used in gradient echo sequences (e.g. FLASH, Contrast Enhanced Magnetic Resonance Angiography) to reduce the echo time and yields a lower gradient moment. The disadvantage of using a partial echo can be a lower SNR, although this may be partly offset by the reduced echo time.
Also called Fractional Echo, Read Conjugate Symmetry, Single Side View.
See also Partial Fourier Technique and acronyms for 'partial echo' from different manufacturers.
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Method and apparatus for subterranean formation flow imaging
   by www.google.com    
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Pulse SequenceForum -
related threadsMRI Resource Directory:
 - Sequences -
 
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.
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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    
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New MR sequence helps radiologists more accurately evaluate abnormalities of the uterus and ovaries
Thursday, 23 April 2009   by www.eurekalert.org    
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RELAX 0.35T™InfoSheet: - Devices -
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www.isoltech.co.kr/english/product/035t.htm From ISOL Technology
'RELAX is open type MRI system created by making up for the weakness of existing conventional MR systems and applying the strength and the application of the middle to high field MR without uncompromising the image quality.
RELAX offers you a premium mix of form, performance and functionality that are patient and user friendly beyond comparison. - New breed of MRI pursuing - patients comfort'

Device Information and Specification
CLINICAL APPLICATION Whole body
CONFIGURATION Open
SURFACE COILS Head, C-spine, L-spine, TMJ, Knee, Shoulder, General purpose, Phased Array System: 4 digital receiver channels (Up to 12 channels)
SYNCHRONIZATION ECG/peripheral: Optional/yes, respiratory gating
PULSE SEQUENCES 2D/3D Spin echo, 2D/3D Gradient echo, 2D/3D Fast spin echo, Inversion recovery, 2D/3D Fast gradient echo sequences, FLAIR/STIR, 2D/3D TOF
IMAGING MODES 3D volume imaging (MIP, MPR) MR Angiography package
FOV 30 cm
MAGNET TYPE Permanent
BORE DIAMETER
or W x H
40 cm diameter (patient)
MAGNET WEIGHT 13500 kg
H*W*D 170 x 210 x 130 cm
COOLING SYSTEM TYPE Water-cooled coil and air-cooled amplifier
FIELD STRENGTH 0.35 T
STRENGTH 25 - 30 mT/m
5-GAUSS FRINGE FIELD lower than 2.4 m from the iso-center
SHIMMING Passive and active
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Radio Frequency Spoiled Steady State Acquisition Rewound Gradient EchoInfoSheet: - Sequences - 
Intro, 
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Types of, 
etc.MRI Resource Directory:
 - Sequences -
 
(RSSARGE) A sequence with spoiled gradient echoes.
See Spoiled Gradient Echo Sequence.
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MRI Resources 
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Rapid Acquisition Matrix FASTInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:
 - Sequences -
 
(RAM-FAST) A fast gradient echo pulse sequence using a magnetization preparation pulse.
See Ultrafast Gradient Echo Sequence.
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