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 'Active Shimming' 
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MRI Resources 
Sequences - Used and Refurbished MRI Equipment - Devices - Mobile MRI Rental - General - Education
 
Active Shimming
 
Shimming by suitably adjusting the currents in shim coils for qualitiy assurance.
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• Related Searches:
    • Tuning
    • Image Quality
    • Field Homogeneity
    • Shim Coils
    • Shimming
 
Further Reading:
  Basics:
Second Order Shimming of High Field Magnets
   by www.healthcare.siemens.com    
  News & More:
Improved shim method based on the minimization of the maximum off-resonance frequency for balanced SSFP
Monday, 1 June 2009   by www.ncbi.nlm.nih.gov    
MRI Resources 
MR Guided Interventions - Non-English - Societies - PACS - Open Directory Project - Stimulator pool
 
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
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)
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
2D: 2 - 100 mm; 3D: 0.5 - 5 mm
1280 x 1024
MEASURING MATRIX
512 x 512
PIXEL INTENSITY
Level Range: -2,000 to +4,000
Sub millimeter
MAGNET TYPE
Self-shielded, superconducting
BORE DIAMETER
or W x H
110 x 43 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
STRENGTH
22 mT/m
3.1 m lateral, 3.6 m vertical
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 
Spine MRI - MRCP - Nerve Stimulator - Education pool - Pacemaker - Health
 
MRP-7000™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.hitachimed.com/products/mrp.asp From Hitachi Medical Systems America, Inc.;
because of its dependability, the MRP-7000™ remains popular more than a decade after the first U.S. system was shipped. This system maintains a high resale value, what has made it one of the most sought-after scanners on the used MRI equipment market.
Device Information and Specification
CLINICAL APPLICATION
Whole body
CONFIGURATION
Vertical Orientation Field
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)
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
MAGNET TYPE
Permanent, self shielded
STRENGTH
8 mT/m
5-GAUSS FRINGE FIELD
horizontal 2.5 m x 2.1 m vertical
Auto shimming, 3-axis/patient and active shimming
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• View the DATABASE results for 'MRP-7000™' (2).Open this link in a new window

MRI Resources 
Abdominal Imaging - Education pool - PACS - MRI Training Courses - Sequences - Chemistry
 
ShimmingForum -
related threads
 
Correction of inhomogeneity of the magnetic field produced by the main magnet of a MRI system due to imperfections in the magnet or to the presence of external ferromagnetic objects. May involve changing the configuration of the magnet or the using of shim coils (active shimming) or adding or removing steel from the magnets poles (passive shimming) to fine-tune the magnetic field.

See also the related poll result: 'Most outages of your scanning system are caused by failure of'
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• View the DATABASE results for 'Shimming' (71).Open this link in a new window

 
Further Reading:
  News & More:
Implementation of Dual-Source RF Excitation in 3 T MR-Scanners Allows for Nearly Identical ADC Values Compared to 1.5 T MR Scanners in the Abdomen
Wednesday, 29 February 2012   by www.plosone.org    
MRI Resources 
Blood Flow Imaging - Absorption and Emission - Diffusion Weighted Imaging - Abdominal Imaging - Fluorescence - Artifacts
 
Upright™ MRIInfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.fonar.com/standup.htm www.fonar.com/standup.htm www.fonar.com/standup.htm From FONAR Corporation;
in October of 2004, the company changed the product name of the Stand-Up™ MRI to the Upright™ MRI. The Indomitable™, Upright™ MRI is the only open MRI in the world that can perform positional MRI (pMRI), i.e. the Upright MRI™ scans patients in upright, weight-bearing positions, in addition to the conventional lie-down positions. The Upright™ MRI is the only device that can scan patients in the position their symptoms occur, in their position of pain. In early clinical reports independently confirm the effectiveness and potential of positional MRI. In October 2000, Fonar received permission to market the Indomitable™ from the FDA.
Device Information and Specification
CLINICAL APPLICATION
Whole body - weight-bearing MRI - position imaging (flexion, extension, bending, standing, sitting and recumbent scanning)
CONFIGURATION
Front-open and Top-open MRI
Solenoid ("Wrap-around") and planar RF receiver coils
SINGLE/MULTI SLICE
0.1 sec per slice
MULTISLICE
0.1 sec per slice
Min. 6.0 cm
Min. 0.8 mm (3DFT)
MEASURING MATRIX
128 - 512
MAGNET TYPE
Iron-frame electromagnet
45.72 cm horizontal
POWER REQUIREMENTS
380/400/415/440/480 V
COOLING SYSTEM TYPE
Water, closed-loop
CRYOGEN USE, L/hr
-
STRENGTH
12 mT/m
5 GAUSS FRINGE FIELD, radial/axial
active, passive
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• View the DATABASE results for 'Upright™ MRI' (5).Open this link in a new window


• View the NEWS results for 'Upright™ MRI' (9).Open this link in a new window.
 
Further Reading:
  Basics:
Product Information - Fonar Corporation
  News & More:
Landmark Independent Study by UCLA School of Medicine Reports Comparison of Dynamic™ Upright® MRI With Static Upright MRI in More Than 1,000 Patients (1,302):
Thursday, 15 November 2007   by www.fonar.com    
FONAR Wins The Wall Street Journal Technology Innovation Award For 2007 For the FONAR UPRIGHT™ Multi-Position™ MRI
Monday, 1 October 2007   by www.fonar.com    
MRI Resources 
Hospitals - Corporations - Claustrophobia - Service and Support - General - MRI Technician and Technologist Schools
 
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MRI is trending to low field magnets :
reduced costs will lead to this change 
AI will close the gap to high field 
only in remote areas 
is only temporary 
never 

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