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Displacement Encoding with Stimulated EchoesInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.
 
(DENSE) Displacement Encoding with Stimulated Echoes is a functional cardiac MRI pulse sequence, used to create maps of myocardial displacement with high resolution.
The DENSE magnitude images produce black blood images to show better myocard-blood contrast and to reduce motion artifacts.
See also Myocardial Late Enhancement, Spin Tagging, Coronary Angiography with D-Tagging, Cardiovascular Imaging, and Black Blood MRA.
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Further Reading:
  Basics:
Latest Pulse Sequence for Displacement-encoded MR Imaging Incorporates Essential Technical Improvements for Multiphase Measurement of Intramyocardial Strain
March 2004   by radiology.rsna.org    
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Echelon™ 1.5TInfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.
 
www.hitachimed.com/contentindex.asp?ID=971

From Hitachi Medical Systems America Inc.;
Hitachi expanded its portfolio with the Echelon™ 1.5T. The MRI scanner combines a compact magnet and a scalable 8-channel RF system with high-performance gradients and slew rate to select short echo times, small field of views, high matrices and thin slices. Standard features of the Echelon MRI system include higher-order active shim, RAPID (parallel imaging for use on brain MRI, body, cardiovascular imaging, and orthopedic coils), multiple coil ports, and an advanced reconstruction engine.


Device Information and Specification
CLINICAL APPLICATION Whole body
CONFIGURATION Short bore
SURFACE COILS Head, body coil, spine, breast, knee, shoulder, vascular multiple array coils.
SYNCHRONIZATION Cardiac gating, ECG/peripheral, respiratory gating
PULSE SEQUENCES SE, IR, FSE, FIR, GE, SG, BASG, PBSG, PCIR, DWI, Radial, Angiography: TOF, FLUTE (Fluoro-triggered bolus MRA), Time-resolved MRA
IMAGING MODES Single, multislice, volume study
PIXEL INTENSITY Level Range: -2,000 to +4,000
SPATIAL RESOLUTION Sub millimeter
MAGNET TYPE Superconducting
POWER REQUIREMENTS 208/220/240 V, single phase
CRYOGEN USE Low cryogen boil-off
FIELD STRENGTH 1.5 T
STRENGTH 30 mT/m
SLEW RATE 150 T/m/sec
SHIMMING Higher-order active shim


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Echelon 1.5T
   by www.hitachimed.com    
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Echo Offset
 
Echo offset is the time setting of spin echo and gradient echo to be not coincident and to generate phase differences between different spectral line signals (e.g., water and fat). The echo offset is the product of the frequency line difference and the time difference (TD) in the echo times and is equal to the magnitude of the result of the phase difference between two spectral lines. Phases may not change linearly with echo offset time in the presence of a large field inhomogeneity. An echo offset excitation pulse sequence can be used in the magnetic field mapping method, to generate maps from which the standard deviation of the phase difference can be calculated.
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Further Reading:
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T1rho-prepared balanced gradient echo for rapid 3D T1rho MRI
Monday, 1 September 2008   by www.ncbi.nlm.nih.gov    
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Echo TimeForum -
related threads
 
(TE) The echo time represents the time in milliseconds between the application of the 90° pulse and the peak of the echo signal in spin echo and inversion recovery pulse sequences.
See also Repetition Time, Spin Echo Sequence and Inversion Recovery Sequence.

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Further Reading:
  Basics:
Magnetic resonance imaging
   by www.scholarpedia.org    
Technical Assessment of Artifact Production from Neuro Endovascular Coil At 3 Tesla MRI: An In Vitro Study
2012   by www.tmps.or.th    
  News & More:
Kidney stone imaging with 3D ultra-short echo time (UTE) magnetic resonance imaging. A phantom study - Abstract
Wednesday, 11 March 2015   by www.urotoday.com    
Ultrashort echo time (UTE) MRI of the spine in thalassaemia
February 2004   by bjr.birjournals.org    
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Echo Train
 
A series of 180° RF rephasing pulses and their corresponding echoes for a fast or turbo spin echo pulse sequence.
See Fast Spin Echo and Turbo Spin Echo Turbo Factor.
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Further Reading:
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RARE
Monday, 3 December 2012   by www2.warwick.ac.uk    
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