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DICOM - Nerve Stimulator - Sequences - MRI Reimbursement - Examinations - Brain MRI
 
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 (Under Development)
CLINICAL APPLICATION Musculoskeletal, extremity
CONFIGURATION Open MRI
SURFACE COILS 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
FOV 25 cm
DISPLAY MATRIX 512 x 512
MEASURING MATRIX 256 x 256 maximum
MAGNET TYPE Permanent
BORE DIAMETER
or W x H
33 cm H, open
POWER REQUIREMENTS 3 kW; 110/220 V single phase
FIELD STRENGTH 0.25 T
STRENGTH 25 mT/m
5-GAUSS FRINGE FIELD, radial/axial 180 cm
SHIMMING 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:
RF Coils in MRI
Sunday, 1 January 2006   by ric.uthscsa.edu    
Imaging Hardware
   by www.fmrib.ox.ac.uk    
MRI Resources 
MRI Centers - MRI Reimbursement - Mobile MRI Rental - Cochlear Implant - IR - Knee MRI
 
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

 
Further Reading:
  News & More:
Additional oblique MRI improved diagnosis of ACL tears
Friday, 7 June 2013   by www.healio.com    
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.


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 
Safety pool - Service and Support - Libraries - Movies - Colonography - Bioinformatics
 
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