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Result : Searchterm 'Matrix' found in 6 terms [] and 79 definitions []
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Searchterm 'Matrix' was also found in the following services: 
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News  (2)  Resources  (3)  Forum  (10)  
 
G-SCANInfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.esaote.de/04_kernspin/gscan/gscan.htm From Esaote S.p.A.; Esaote introduced the new G-SCAN at the RSNA in Dec. 2004. The G-SCAN covers almost all musculoskeletal applications including the spine. The tilting gantry is designed for scanning in weight-bearing positions. This unique MRI scanner is developed in line with the Esaote philosophy of creating high quality MRI systems that are easy to install and that have a low breakeven point.
Device Information and Specification
CLINICAL APPLICATION
CONFIGURATION
Spine, 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
100 up to 350 mm, 25 mm displayed
512 x 512
MEASURING MATRIX
256 x 256 maximum
MAGNET TYPE
Permanent
BORE DIAMETER
or W x H
33 cm H, open
POWER REQUIREMENTS
100/110/200/220/230/240 V
STRENGTH
25 mT/m
5-GAUSS FRINGE FIELD
180 cm
Passive
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Searchterm 'Matrix' was also found in the following services: 
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Radiology  (12) Open this link in a new windowUltrasound  (6) Open this link in a new window
Gibbs ArtifactInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview
Please note that there are different common names for this MRI artifact.
Artifact Information
NAME
Gibbs, Gibbs ringing, truncation
DESCRIPTION
Edge ringing, syrinx-like stripe
REASON
Sharp changes in intensity (incomplete digitization of the echo)
HELP
More samples
The Gibbs or ringing artifact appears as a series of lines in the MR image parallel to abrupt and intense changes in the object at this location. This artifact does not occur visibly on smooth objects. This artifact is caused by the Gibbs phenomenon, an overshoot or ringing of Fourier series occurring at discontinuities.
In the spinal cord, a small syrinx can be simulated by the Gibbs phenomenon. Gibbs artifacts are also seen in other regions, for example the brain//skull interface.
Fine lines visible in an image may be due to undersampling of the high spatial frequencies, respectively incomplete digitization of the echo.
With more encoding steps the Gibbs artifacts is less intense and narrower. Therefore, e.g. the artifact is more intense in the 256 point dimension of a 256x512 acquisition matrix.
mri safety guidance
Image Guidance
This problem can only be resolved by smoothing filters (LanczosSigmaFactor, 2-D Exponential Filtering, Gegenbauer Reconstruction etc.) or with a higher acquisition matrix and/or a smaller FOV, to smooth the object.

See also Gibbs Phenomenon and Apodization.
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• View the DATABASE results for 'Gibbs Artifact' (4).Open this link in a new window

 
Further Reading:
  Basics:
Lanczos sigma Factor
   by mathworld.wolfram.com    
  News & More:
Troubleshooting the ACR MRI Accreditation Phantom Tests
   by www.aapm.org    
MRI Resources 
Manufacturers - Safety pool - Distributors - Case Studies - Services and Supplies - Developers
 
Infinion 1.5TPanorama 0.2InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
From Philips Medical Systems; www.medical.philips.com/main/products/mri/products/infinion1.5t/features/ Philips Infinion 1.5 T is designed to maximize the efficiency and quality of patient care. Developed with the patient in mind, the Infinion is the shortest and most open 1.5T scanner available. The unique 'ultra short' 1.4 m magnet assures patient comfort and acceptance without compromising image quality and clinical performance.
Device Information and Specification
CLINICAL APPLICATION
Whole body
CONFIGURATION
Ultra short bore
Head, head / neck, integrated C-spine, L/T spine array, small large GP coils, body flex array, torso pelvis array, breast array, endocavitary, shoulder array, lower extremity, hand / wrist, cardiac, PV array
SYNCHRONIZATION
ECG/peripheral, respiratory gating
PULSE SEQUENCES
SE, TSE, SS TSE, EPI, IR, STIR, FLAIR, FFE, TFE, T1 TFE, T2 TFE, Presat, Fatsat, MTC, Diff-opt., Angiography: PCA, MCA, TOF
IMAGING MODES
Single slice, single volume, multi slice, multi volume
TR
3.1 msec minimum
TE
0.9 msec minimum
SINGLE/MULTI SLICE
80 images/sec std.; up to320 opt.@256
FOV
0.4 - 56 cm
2D: 0.3 mm; 3D: 0.2 mm
1024 x 1024
MEASURING MATRIX
8 x 8 to 1024 x 1024
PIXEL INTENSITY
256 gray scale
BORE DIAMETER
or W x H
60 cm diameter (patient)
MAGNET WEIGHT
4100 kg w/cryogen's
H*W*D
233 (lead fitted) x 198 x 140 cm
POWER REQUIREMENTS
400/480 V
COOLING SYSTEM TYPE
Closed loop, chilled water
CRYOGEN USE
0.06 L/hr helium
STRENGTH
30 mT/m
5-GAUSS FRINGE FIELD
3.0 m / 5.0 m
Passive/active
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• View the DATABASE results for 'Infinion 1.5T™' (2).Open this link in a new window

Searchterm 'Matrix' was also found in the following services: 
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News  (2)  Resources  (3)  Forum  (10)  
 
Intera Achieva 1.5T™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.medical.philips.com/main/products/mri/products/intera_achieva/ From Philips Medical Systems;
The clinical capabilities of MR will further expand. Inside and out, the Achieva is a friendly, open system designed for optimal patient comfort and maximized workflow with high functionality. The Achieva 1.5T can be upgraded to Achieva I/T, with three configurations optimized for MR guided interventions and therapy:
Achieva I/T
Achieva I/T Neurosurgery
Achieva I/T Cardiovascular (or XMR - combining an Achieva 1.5T CV system and an X-Ray system)
Device Information and Specification
CLINICAL APPLICATION
Whole body
CONFIGURATION
Short bore compact
Standard: Head, body, C1, C3; Optional: Small joint, flex-E, flex-R, endocavitary (L and S), dual TMJ, knee, neck, T/L spine, breast; optional phased array: Spine, pediatric, 3rd party connector; Optional SENSEâ„¢ coils for all applications
Optional
SYNCHRONIZATION
ECG/peripheral: Optional/yes, respiratory gating
PULSE SEQUENCES
SE, Modified-SE, IR (T1, T2, PD), STIR, FLAIR, SPIR, FFE, T1-FFE, T2-FFE, Balanced FFE, TFE, Balanced TFE, Dynamic, Keyhole, 3D, Multi Chunk 3D, Multi Stack 3D, K Space Shutter, MTC, TSE, Dual IR, DRIVE, EPI, Cine, 2DMSS, DAVE, Mixed Mode; Angiography: Inflow MRA, TONE, PCA, CE MRA
IMAGING MODES
Single Slice 2D , Multi Single Slice 2D, Multi Slice 2D, 3D, Multi Chunk 3D, Multi Stack 3D
FOV
Over 40 cm
0.05 mm
128 x 128, 256 x 256,512 x 512,1024 x 1024 (64 for Bold img)
MEASURING MATRIX
Variable in 1% increments
PIXEL INTENSITY
Lum.: 120 cd/m2; contrast: 150:1
Variable (op. param. depend.)
60 x 60 cm
POWER REQUIREMENTS
380/400 V
CRYOGEN USE
0.03 L/hr helium
STRENGTH
up to 66 mT/m
5-GAUSS FRINGE FIELD
2.4 m / 3.8 m
Passive and dynamic
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• View the DATABASE results for 'Intera Achieva 1.5T™' (2).Open this link in a new window

Searchterm 'Matrix' was also found in the following services: 
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Radiology  (12) Open this link in a new windowUltrasound  (6) Open this link in a new window
Intera Achieva 3.0T™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.medical.philips.com/main/products/mri/products/intera_achieva3.0t/ From Philips Medical Systems;
Philips continues to expand the frontiers of utra high field MRI with the introduction of the new Intera Achieva 3.0T™. Its powerful future-safe platform shares all the advantages of the Achieva family and covers applications throughout the whole body.
Device Information and Specification
CLINICAL APPLICATION
Whole body
CONFIGURATION
Short bore compact
Standard: T/R-head, Body, Optional phased array: CTL spine; Optional SENSE coils: Torso, Cardiac, Head, Knee, Breast, Neurovascular, Flex M, Flex L
Optional
SYNCHRONIZATION
ECG/peripheral: Optional/yes, respiratory gating
PULSE SEQUENCES
SE, Modified-SE, IR (T1, T2, PD), STIR, FLAIR, SPIR, FFE, T1-FFE, T2-FFE, Balanced FFE, TFE, Balanced TFE, Dynamic, Keyhole, 3D, Multi Chunk 3D, Multi Stack 3D, K Space Shutter, MTC, TSE, Dual IR, DRIVE, EPI, Cine, 2DMSS, DAVE, Mixed Mode; Angiography: Inflow MRA, TONE, PCA, CE MRA
IMAGING MODES
Single Slice 2D , Multi Single Slice 2D, Multi Slice 2D, 3D, Multi Chunk 3D, Multi Stack 3D
Minimum TR
1.1 msec
FOV
Over 40 cm
0.05 mm
128 x 128, 256 x 256,512 x 512,1024 x 1024 (64 for Bold img)
MEASURING MATRIX
Variable in 1% increments
PIXEL INTENSITY
Lum.: 120 cd/m2; contrast: 150:1
Variable (op. param. depend.)
35 x 35 cm
MAGNET WEIGHT
5500 kg
H*W*D
206 x 200 x 167 cm
POWER REQUIREMENTS
380/400 V
CRYOGEN USE
0.15 L/hr helium
STRENGTH
up to 80 mT/m
5-GAUSS FRINGE FIELD
3.0 m / 5.2 m
Passive and dynamic, 1st order std./2nd opt.
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• View the DATABASE results for 'Intera Achieva 3.0T™' (2).Open this link in a new window

 
Further Reading:
  News & More:
Faster speed, better spatial resolution lead 3T benefits
   by sipi.usc.edu    
MRI Resources 
Developers - Breast Implant - Lung Imaging - Abdominal Imaging - Fluorescence - Sequences
 
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