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S-SCANInfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, etc.
 
www.esaote.com/products/MRI/sScan/products1.htm From Esaote S.p.A.; Esaote introduced the S-SCAN at RSNA in November 2007. The S-SCAN is a dedicated joint and spine MR scanner derived from the company's earlier G-SCAN system. Unlike the G-SCAN, neither the patient table nor the magnet can rotate from horizontal to vertical position. The patient table can only moved manually. Improved electronics, new coils for lumbar and cervical spine, new pulse sequences, a modified version of the magnet poles and gradient coils are used with a new software release in the S-SCAN.
Esaote North America is the exclusive U.S. distributor of this MRI device.
Device Information and Specification
CLINICAL APPLICATION
CONFIGURATION
4-channel phased array spine coil, extremity, shoulder, flex coil, knee dual phased array, ankle//foot dual phased array, hand//wrist dual phased array
PULSE SEQUENCES
SE, GE, IR, STIR, TSE, 3D CE, GE-STIR, 3D GE, ME, TME, HSE
IMAGING MODES
Single, multislice, volume study, fast scan, multi slab, cine
25 cm
MEASURING MATRIX
256 x 256 maximum
MAGNET TYPE
Permanent
33 cm H, open
POWER REQUIREMENTS
3 kW; 110/220 V single phase
STRENGTH
25 mT/m
5-GAUSS FRINGE FIELD, radial/axial
180 cm
Passive
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• View the NEWS results for 'S-SCAN' (1).Open this link in a new window.

• View the DATABASE results for 'S-SCAN' (3).Open this link in a new window

 
Further Reading:
  News & More:
Wichita medical facility gets first Hologic S-scan MRI in the United States
Friday, 19 October 2007   by wichita.bizjournals.com    
Saddle CoilInfoSheet: - Coils -
Intro, 
Overview, 
etc.MRI Resource Directory:
 - Coils -
 
A saddle coil has a cylindrical body, with one or more turns of wire (older versions) or foil (newer versions) on each side. It generates a very homogenous field in the direction of its long axis. To achieve a higher B1 homogeneity there are different developments like Folded Litz-foil Saddle Coils or Etched Litz-foil Saddle Coils.

See also the related poll result: '3rd party coils are better than the original manufacturer coils'
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• View the DATABASE results for 'Saddle Coil' (6).Open this link in a new window

 
Further Reading:
  Basics:
Imaging Hardware
   by www.fmrib.ox.ac.uk    
MRI Resources 
Patient Information - Quality Advice - Contrast Agents - Breast Implant - Online Books - Developers
 
SagittalForum -
there are related threads
 
A plane, slice or section of the body cutting from front to back through the sagittal suture of the skull, and continued down through the body in the same direction, dividing it into two parts.
 
Images, Movies, Sliders:
 MRI - Anatomic Imaging of the Foot  Open this link in a new window
    
SlidersSliders Overview

 Anatomic MRI of the Knee 1  Open this link in a new window
    
SlidersSliders Overview

 Circle of Willis, Time of Flight, MIP  Open this link in a new window
    
SlidersSliders Overview

 
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• View the DATABASE results for 'Sagittal' (9).Open this link in a new window

Sample Imperfection (Artifact)InfoSheet: - Artifacts -
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview
Artifact Information
NAME
Sample imperfection
DESCRIPTION
Shifts of the signal in the phase encoding direction
REASON
Distorting the k-space trajectory, reduced bandwidth
HELP
Fat suppression, more excitations
Artifacts either by distorting the k-space trajectory (i.e. due to imperfect shimming) or as a consequence of the reduced bandwidth in the phase encode direction, commonly with EPI sequences.
While a standard spin warp-based sequence has an infinitely large bandwidth in the phase encode direction (about 1 or 2 kH), the bandwidth in EPI is related to the time between the gradient echoes (about a millisecond).
Hence even small frequency offsets can result in significant shifts of the signal in the phase encoding direction. Segmentation can introduce ghosting if there are significant difference in the amplitude and phase of the signal. This can be a particular problem when trying to acquire the segments in rapid succession.
mri safety guidance
Image Guidance
Suitable choices of excitation schemes and/or subsequent correction can help to reduce this artifact. The signal from fat can easily be offset by a large fraction of the FOV, and must be suppressed. The effect of frequency offsets can be reduced by collecting data with more than one excitation, which effectively increases the bandwidth in the phase encoding direction.
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Sampling
 
Conversion of the analog signal to a series of digital values by measurement at a set of particular times; this utilizes the analog to digital converter. If the rate of sampling is less than twice the highest frequency in the signal, aliasing will occur. The duration of sampling determines how small a difference of frequencies can be separated.

See also Aliasing.
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• View the DATABASE results for 'Sampling' (45).Open this link in a new window

MRI Resources 
Stent - Abdominal Imaging - Resources - Veterinary MRI - Musculoskeletal and Joint MRI - Pediatric and Fetal MRI
 
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New acceleration techniques will :
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