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 '5 Gauss Fringe Field' 
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Result : Searchterm '5 Gauss Fringe Field' found in 1 term [] and 7 definitions [], (+ 16 Boolean[] results
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MRI Resources 
Abdominal Imaging - Most Wanted - Education - Hospitals - Musculoskeletal and Joint MRI - Contrast Agents
 
5 Gauss Fringe Field
 
This line specifies the perimeter around a MR scanner within which the static magnetic fields are higher than five gauss. Five gauss and below are considered 'safe' levels of static magnetic field exposure for the general public.
Due to the physical properties of magnetic fields, the magnetic flux, which penetrates the useful volume of the magnet will return through the surroundings of the magnet to form closed field lines. Depending on the magnet construction, the returning flux will penetrate large open spaces (unshielded magnets) or will be confined largely to iron yokes or through secondary coils (shielded magnets).
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• Related Searches:
    • Low Field MRI
    • Magnetic Shielding
    • Gauss
    • Tesla
    • 5 Gauss Limit
 
Further Reading:
  Basics:
How strong are magnets?
   by my.execpc.com    
  News & More:
Magnetic Field
   by hyperphysics.phy-astr.gsu.edu    
MRI Resources 
Spectroscopy - Claustrophobia - General - MR Guided Interventions - Stent - Veterinary MRI
 
AIRIS II™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.hitachimed.com/products/airis_2.asp

From Hitachi Medical Systems America Inc.;
the AIRIS II, an entry in the diagnostic category of open MR systems, was designed by Hitachi Medical Systems America Inc. (Twinsburg, OH, USA) and Hitachi Medical Corp. (Tokyo) and is manufactured by the Tokyo branch. A 0.3 T field-strength magnet and phased array coils deliver high image quality without the need for a tunnel-type high-field system, thereby significantly improving patient comfort not only for claustrophobic patients.


Device Information and Specification
CLINICAL APPLICATION Whole body
CONFIGURATION Vertical Field, Open MRI
SURFACE COILS QD Head, MA Head and Neck, QD C-Spine, MA or QD Shoulder, MA CTL Spine, QD Knee, Neck, QD TMJ, QD Breast, QD Flex Body (4 sizes), Small and Large Extrem., QD Wrist, MA Foot and Ankle (WIP), PVA (WIP)
SPECTROSCOPY No
SYNCHRONIZATION Cardiac gating, ECG/peripheral, respiratory gating (2 modes)
PULSE SEQUENCES SE, GE, GR, IR, FIR, STIR, FSE, ss-FSE, FLAIR, EPI -DWI, SE-EPI, ms - EPI, SSP, MTC, SARGE, RSSG, TRSG, MRCP, Angiography: CE, 2D/3D TOF
IMAGING MODES Single, multislice, volume study
TR SE: 30 - 10,000msec GE: 20 - 10,000msec IR: 50 - 16,700msec FSE: 200 - 16,7000msec
TE SE : 10 - 250msec IR: 10 -250msec GE: 5 - 50 msec FSE: 15 - 2,000
SINGLE/MULTI SLICE 0.05 sec/image (256 x 256)
FOV 5cm to 42 cm continuous
SLICE THICKNESS 2D: 2 - 100 mm; 3D: 0.5 - 5 mm
DISPLAY MATRIX 1280 x 1024
MEASURING MATRIX 512 x 512
PIXEL INTENSITY Level Range: -2,000 to +4,000
SPATIAL RESOLUTION Sub millimeter
MAGNET TYPE Self-shielded, permanent
BORE DIAMETER
or W x H
110 x 43 cm
MAGNET WEIGHT 15,700 kg
H*W*D 79 x 111 x 73 cm
POWER REQUIREMENTS 208/220/240 V, single phase
COOLING SYSTEM TYPE Air-cooled
CRYOGEN USE
FIELD STRENGTH 0.3 T
STRENGTH 15 mT/m
5 GAUSS FRINGE FIELD 2.0 m lateral, 2.5 m vert./long
SHIMMING Auto shimming, 3-axis/patient, and volume shim

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MRI Resources 
Supplies - - Homepages - MRCP - Chemistry - Safety Products
 
ARTOSCAN™ - MInfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.gemedicalsystems.com/rad/mri/products/artoscan/specs.html

Developed by GE Lunar; the ARTOSCAN™-M is designed specifically for in-office musculoskeletal imaging. ARTOSCAN-M's compact, modular design allows placing within a clinical environment, bringing MRI to the patient. Patients remain outside the magnet at all times during the examinations, enabling constant patient-technologist contact. ARTOSCAN-M requires no special RF room, magnetic shielding, special power supply or air conditioning.
The C-SCAN™ (also known as Artoscan C) is developed from the ARTOSCAN™ - M, with a new computer platform.


Device Information and Specification
CLINICAL APPLICATION Dedicated extremity
CONFIGURATION Closed
SURFACE COILS Linear and dual phased array coil, knee, ankle, wrist coils
PULSE SEQUENCES SE, GE, IR, STIR, FSE, 3D CE, GE-STIR, 3D GE, ME, TME, HSE
IMAGING MODES Single, multislice, volume study, fast scan, multi slab, cine
TR 12 - 5,000 msec
TE 5 - 220 msec
SINGLE SLICE 0.8 sec/image
MULTISLICE 0.8 sec/image
FOV 10 - 20 cm
SLICE THICKNESS 2D: 2 mm - 10 mm;
3D: 0.6 mm - 10 mm
DISPLAY MATRIX 512 x 512
MEASURING MATRIX 256 x 256 maximum
PIXEL INTENSITY 4,096 gray lvls, 256 lvls in 3D
SPATIAL RESOLUTION 0.4 mm
MAGNET TYPE Ferrite Permanent
MAGNET WEIGHT 965 kg
POWER REQUIREMENTS 100/110/200/220/230/240
FIELD STRENGTH 0.2 T
STRENGTH 10 mT/m
5 GAUSS FRINGE FIELD, radial/axial 28 cm/60 cm
SHIMMING Passive

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• View the DATABASE results for 'ARTOSCAN™ - M' (3).Open this link in a new window

MRI Resources 
Collections - Implant and Prosthesis pool - Brain MRI - - Most Wanted - Education
 
Altaire™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.hitachimed.com/products/altaire.asp

From Hitachi Medical Systems America, Inc.;
the AIRIS made its debut in 1995. Hitachi followed up with the AIRIS II system, which has proven equally successfully. 'All told, Hitachi has installed more than 1,000 MRI systems in the U.S., holding more than 17 percent of the total U.S. MRI installed base, and more than half of the installed base of open MR systems,' says Antonio Garcia, Frost and Sullivan industry research analyst. Now Altaire employs a blend of innovative Hitachi features called VOSI™ technology, optimizing each sub-system's performance in concert with the other sub-systems, to give the seamless mix of high-field performance and the patient comfort, especially for claustrophobic patients, of open MR systems.


Device Information and Specification
CLINICAL APPLICATION Whole body
CONFIGURATION Vertical Field, Open MRI
SURFACE COILS DualQuad T/R Body Coil, MA Head, MA C-Spine, MA Shoulder, MA Wrist, MA CTL Spine, MA Knee, MA TMJ, MA Flex Body (3 sizes), Neck, small and large Extremity, PVA (WIP), Breast (WIP), Neurovascular (WIP), Cardiac (WIP) and MA Foot//Ankle (WIP)
SPECTROSCOPY No
SYNCHRONIZATION Cardiac gating, ECG/peripheral, respiratory gating (2 modes)
PULSE SEQUENCES SE, GE, GR, IR, FIR, STIR, ss-FSE, FSE, DE-FSE/FIR, FLAIR, ss/ms-EPI, ss/ms EPI- DWI, SSP, MTC, SE/GE-EPI, MRCP, SARGE, RSSG, TRSG, BASG, Angiography: CE, PC, 2D/3D TOF
IMAGING MODES Single, multislice, volume study
TR SE: 30 - 10,000msec GE: 3.6 - 10,000msec IR: 50 - 16,700msec FSE: 200 - 16,7000msec
TE SE : 8 - 250msec IR: 5.2 -7,680msec GE: 1.8 - 2,000 msec FSE: 5.2 - 7,680
SINGLE/MULTI SLICE 0.05 sec/image (256 x 256)
FOV 5cm to 45 cm continuous
SLICE THICKNESS 2D: 2 - 100 mm; 3D: 0.5 - 5 mm
DISPLAY MATRIX 1280 x 1024
MEASURING MATRIX 512 x 512
PIXEL INTENSITY Level Range: -2,000 to +4,000
SPATIAL RESOLUTION Sub millimeter
MAGNET TYPE Self-shielded, superconducting
BORE DIAMETER
or W x H
115 x 47 cm
MAGNET WEIGHT 41,700 kg
H*W*D 256 x 348 x 236 cm
POWER REQUIREMENTS 208 V +/- 10%, 3 phase
COOLING SYSTEM TYPE Water-cooled
CRYOGEN USE Refill 1/year
FIELD STRENGTH 0.7 T
STRENGTH 22 mT/m
5 GAUSS FRINGE FIELD 3.1 m lateral, 3.6 m vertical
SHIMMING Auto shimming, 3-axis/patient and active shimming

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• View the DATABASE results for 'Altaire™' (2).Open this link in a new window

 
Further Reading:
  News & More:
Altaire High-Field Open MRI(.pdf)
2001
MRI Resources 
Intraoperative MRI - Mobile MRI Rental - Functional MRI - Directories - Homepages - Breast Implant
 
Low Field MRIForum -
related threads
 
Advantages of low field imaging are the small-sized 5 Gauss fringe field and therefore the less static magnetic field exposure for the surrounding area, as well as less contraindications causing lower risks for the MRI safety by implemented metal and magnetic devices and equipment.
Low field systems are sometimes for restricted use, e.g. dedicated extremity scanner or open MRI devices. Open MRI devices equipped with permanent magnets are well-suited for MR guided interventions because these machines combine the lower magnetic fields of this type of magnets and the better patient access of open MRI scanner.
In some cases, the contrast of different tissues is better at lower field strength, depending on their T1 or T2 relaxation times. The disadvantage of the lower signal to noise ratio are a poor resolution and a longer scan time for a good image quality.
See also Claustrophobia, Contraindications and MRI Safety.

See also the related poll result: 'In 2010 your scanner will probably work with a field strength of'
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• View the DATABASE results for 'Low Field MRI' (8).Open this link in a new window


• View the NEWS results for 'Low Field MRI' (5).Open this link in a new window.
 
Further Reading:
  Basics:
Low-Field MRI of Laser Polarized Noble Gas
   by xenon.unh.edu    
  News & More:
Portable MRI could aid wounded soldiers and children in the third world
Thursday, 23 April 2015   by phys.org    
Portable 'battlefield MRI' comes out of the lab
Thursday, 30 April 2015   by physicsworld.com    
MRI Resources 
MRI Accidents - Manufacturers - Breast MRI - Pathology - Jobs pool - NMR
 
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