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Result : Searchterm 'Signa' found in 23 terms [] and 358 definitions []
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Searchterm 'Signa' was also found in the following services: 
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News  (60)  Resources  (16)  Forum  (78)  
 
Signa OpenSpeed™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.gehealthcare.com/usen/mr/open_speed/index.html From GE Healthcare;
a friendly and less confining appearance targets the 7% of individuals who refuse to have an MRI because of claustrophobia. This open MRI system is also up to three times faster than other scanners, therefore the Signa OpenSpeed™ reducing exam time and scheduling issues. In addition, a swing table provides better access and supports up to 500 pounds.
Device Information and Specification
CLINICAL APPLICATION
Whole body
CONFIGURATION
Integrated transmit and receive body coil; 4 channel head array, 8 channel CTL array, 2 channel shoulder array, 3 channel large extremity array, 3 channel small extremity array, 4 channel foot array, 3 channel wrist array, 4 channel breast array
SYNCHRONIZATION
Standard cardiac gating, ECG/peripheral, respiratory gating
PULSE SEQUENCES
Standard: SE, IR, 2D/3D GRE and SPGR, Angiography: 2D/3D TOF, 2D/3D Phase Contrast;; 2D/3D FSE, 2D/3D FGRE and FSPGR, SSFP, FLAIR, EPI, optional: 2D/3D Fiesta, FGRET, Spiral, Tensor
IMAGING MODES
Localizer, single slice, multislice, volume, fast, POMP, multi slab, cine
TR
1.3 to 12000 msec in increments of 1 msec
TE
0.4 to 2000 msec in increments of 1 msec
SINGLE/MULTI SLICE
Simultaneous scan and reconstruction;; 100 images/second with Reflex 100
1cm to 40 cm continuous
2D: 0.8mm - 20mm 3D: 0.1mm - 20mm
1280 x 1024
MEASURING MATRIX
128x512 steps 32 phase//freq.
PIXEL INTENSITY
256 gray levels
0.08 mm; 0.02 mm optional
175 x 85 x 447 cm
MAGNET WEIGHT
8256 kg
H*W*D
530 x 175 x 250 cm
POWER REQUIREMENTS
200 - 480, 3-phase
COOLING SYSTEM TYPE
Liquid helium
0.03 L/hr, holds 300 L
STRENGTH
25 mT/m
5-GAUSS FRINGE FIELD
4.7 m/ 3.8 m
Computerized passive shimming during magnet setup, autoshim per series with automatic table motion to magnet isocenter for each prescription
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Further Reading:
  News & More:
MR Surgical Suite, Improving surgical procedure quality (.pdf)
   by www3.gehealthcare.com    
MRI Resources 
MRI Physics - Brain MRI - Anatomy - Sequences - Fluorescence - Stimulator pool
 
Signal Suppression
 
The elimination or reduction of a particular signal by, for example, the application of a narrow band frequency-selective preparation pulse centered at the resonant frequency of the signal. This can also be accomplished using an inversion recovery technique to null the signal as it recovers its longitudinal magnetization.
 
Images, Movies, Sliders:
 Knee MRI Sagittal STIR 003  Open this link in a new window
    
 Brain MRI Coronal FLAIR 001  Open this link in a new window
    
 
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• View the DATABASE results for 'Signal Suppression' (2).Open this link in a new window

MRI Resources 
Online Books - Musculoskeletal and Joint MRI - Coils - Mass Spectrometry - Sequences - Jobs
 
FID Signal ArtifactInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview
Artifact Information
NAME
FID (with spin echo) signal
DESCRIPTION
Line across the center of the image
REASON
Combination of problems
HELP
Call the service
A combination of B1 inhomogeneity, poor slice profile, and insufficient spoiler gradients between the refocusing pulse and the readout interval of a spin echo sequence results in a FID signal being detected along with the echo.
Since the FID is not phase encoded (normally the phase encoding occurs before the refocusing pulse), it is not dispersed along the phase encoding axis, but appears as a line across the center of the image.
mri safety guidance
Image Guidance
If the problem persists, it must be addressed by a service representative.
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• View the DATABASE results for 'FID Signal Artifact' (2).Open this link in a new window

 
Further Reading:
  News & More:
MRI Artifact Gallery
   by chickscope.beckman.uiuc.edu    
Searchterm 'Signa' was also found in the following services: 
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News  (60)  Resources  (16)  Forum  (78)  
 
Signal to Noise Ratio
 
(SNR or S/N) The signal to noise ratio is used in MRI to describe the relative contributions to a detected signal of the true signal and random superimposed signals ('background noise') - a criterion for image quality.
One common method to increase the SNR is to average several measurements of the signal, on the expectation that random contributions will tend to cancel out. The SNR can also be improved by sampling larger volumes (increasing the field of view and slice thickness with a corresponding loss of spatial resolution) or, within limits, by increasing the strength of the magnetic field used. Surface coils can also be used to improve local signal intensity. The SNR will depend, in part, on the electrical properties of the sample or patient being studied. The SNR increases in proportion to voxel volume (1/resolution), the square root of the number of acquisitions (NEX), and the square root of the number of scans (phase encodings). SNR decreases with the field of view squared (FOV2) and wider bandwidths. See also Signal Intensity and Spin Density.

Measuring SNR:
Record the mean value of a small ROI placed in the most homogeneous area of tissue with high signal intensity (e.g. white matter in thalamus). Calculate the standard deviation for the largest possible ROI placed outside the object in the image background (avoid ghosting/aliasing or eye movement artifact regions).
The SNR is then:
Mean Signal/Standard Deviation of Background Noise
 
Images, Movies, Sliders:
 Brain MRI Images T1  Open this link in a new window
      

 
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• View the DATABASE results for 'Signal to Noise Ratio' (48).Open this link in a new window


• View the NEWS results for 'Signal to Noise Ratio' (2).Open this link in a new window.
 
Further Reading:
  Basics:
Musculoskeletal MRI at 3.0 T: Relaxation Times and Image Contrast
Sunday, 1 August 2004   by www.ajronline.org    
  News & More:
Picture-Perfect Particles Enhance MRI Signal
Friday, 13 April 2012   by cen.acs.org    
Researchers design 'intelligent' metamaterial to make MRIs affordable and accessible
Tuesday, 5 November 2019   by phys.org    
Metamaterials boost sensitivity of MRI machines
Thursday, 14 January 2016   by www.eurekalert.org    
Optimizing Musculoskeletal MR
   by rad.usuhs.mil    
MRI Resources 
Implant and Prosthesis - Directories - Databases - Coils - MRI Centers - Research Labs
 
Signa Infinity 1.0T™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.gehealthcare.com/usen/mr/index.html From GE Healthcare;
the Signa Infinity Magnetic Resonance system is a short bore, high performance, whole-body imaging system operating at 1.0 Tesla. The system can image in any orthogonal or oblique plane (including single and double axis oblique), using a wide variety of pulse sequences.
Device Information and Specification
CLINICAL APPLICATION
Whole body
CONFIGURATION
Short bore
Head and body coil standard; all other coils optional; open architecture makes system compatible with a wide selection of coils
SYNCHRONIZATION
ECG/peripheral, respiratory gating
PULSE SEQUENCES
Standard: SE, IR, 2D/3D GRE and SPGR, Angiography;; 2D/3D TOF, 2D/3D Phase Contrast;; 2D/3D FSE, 2D/3D FGRE and FSPGR, SSFP, FLAIR, optional: EPI, 2D/3D Fiesta, FGRET, Spiral
IMAGING MODES
Localizer, single slice, multislice, volume, fast, POMP, multi slab, cine
TR
4.4 msec to 12000 msec in increments of 1 msec
TE
1.0 to 2000 msec; increments of 1 msec
SINGLE/MULTI SLICE
Simultaneous scan and reconstruction;; up to 100 images/second with Reflex 100
1 cm to 48 cm continuous
2D 0.7 mm to 20 mm; 3D 0.1 mm to 5 mm
1280 x 1024
MEASURING MATRIX
128x512 steps 32 phase encode
PIXEL INTENSITY
256 gray levels
0.08 mm; 0.02 mm optional
MAGNET WEIGHT
3613 kg
H*W*D
172 x 208 x 216 cm
POWER REQUIREMENTS
480 or 380/415 V
COOLING SYSTEM TYPE
Closed-loop water-cooled gradient
Less than 0.03 L/hr liquid helium
STRENGTH
SmartSpeed 23 mT/m, HiSpeed Plus 33 mT/m
5-GAUSS FRINGE FIELD
4.0 m x 2.8 m axial x radial
Active
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• View the DATABASE results for 'Signa Infinity 1.0T™' (2).Open this link in a new window

MRI Resources 
Diffusion Weighted Imaging - Absorption and Emission - Developers - Non-English - MRI Physics - Most Wanted
 
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