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Half Fourier
 
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• View the DATABASE results for 'Half Fourier' (8).Open this link in a new window

 
Further Reading:
  Basics:
Clinical evaluation of a speed optimized T2 weighted fast spin echo sequence at 3.0 T using variable flip angle refocusing, half-Fourier acquisition and parallel imaging
Wednesday, 25 October 2006
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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• View the DATABASE results for 'Half Fourier Acquisition Single Shot Turbo Spin Echo' (5).Open this link in a new window

 
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 
Spine MRI - Chemistry - Supplies - Directories - Nerve Stimulator - Functional MRI
 
Half Fourier Imaging
 
(HFI) This technique is sometimes referred to as 'half NEX' imaging or 'PCS' (phase conjugate symmetry).

See Partial Fourier Imaging.
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Half Scan
 
(HS) A method in which approximately one half of the acquisition matrix in the phase encoding direction is acquired. Half scan is possible because of symmetry in acquired data. Since negative values of phase encoded measurements are identical to corresponding positive values, only a little over half (more than 62.5%) of a scan actually needs to be acquired to replicate an entire scan. This results in a reduction in scan time at the expense of signal to noise ratio. The time reduction can be nearly a factor of two, but full resolution is maintained.
Half scan can be used when scan times are long, the signal to noise ratio is not critical and where full spatial resolution is required. Half scan is particularly appropriate for scans with a large field of view and relatively thick slices; and, in 3D scans with many slices. In some fast scanning techniques the use of Half scan enables a shorter TE thus improving contrast. For this reason, the Half scan parameter is located in the contrast menu.

More information about scan time reduction; see also partial fourier technique.
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• View the DATABASE results for 'Half Scan' (4).Open this link in a new window

Hardware
 
MRI hardware includes the electrical and mechanical components of a scanning device.
The main hardware components for the MRI machine are:
The magnet establishing the B0 field to align the spins.
Within the magnet are the gradient coils for producing variations in B0 in the X, Y, and Z directions to make a localization of the received data possible.
Within the gradient coil or directly on the object being imaged is the radio frequency (RF) coil. This RF coil is used to establish the B1 magnetic field necessary to excite the spinning nuclei. The RF coil also detects the signal emitted from the spins within the object being imaged.
The RF amplifier increases the power of the pulses.
The analog to digital converter converts the received analog raw data into digital values.
Depending on the design of the device and the body part being imaged the patient is positioned inside the magnet (e.g. on a movable table or standing upright).
The MRI scan room is surrounded by a RF shield (Faraday cage).
In addition, a computer console, a display, and a film printer belong to the MRI equipment.

See also the related poll result: 'Most outages of your scanning system are caused by failure of'
Radiology-tip.comradCT Scanner,  Gamma Camera
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Medical-Ultrasound-Imaging.comUltrasound Machine
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• View the NEWS results for 'Hardware' (1).Open this link in a new window.

• View the DATABASE results for 'Hardware' (19).Open this link in a new window

 
Further Reading:
  Basics:
Imaging Hardware
   by www.fmrib.ox.ac.uk    
  News & More:
Why non-magnetic capacitors matter in medical imaging
Wednesday, 19 February 2020   by www.medicaldesignandoutsourcing.com    
A transportable MRI machine to speed up the diagnosis and treatment of stroke patients
Wednesday, 22 April 2015   by medicalxpress.com    
Magnetic resonance angiography: current status and future directions
Wednesday, 9 March 2011   by www.jcmr-online.com    
MRI Resources 
Mobile MRI Rental - Implant and Prosthesis pool - Image Quality - Manufacturers - Libraries - Equipment
 
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