Magnetic Resonance - Technology Information Portal Welcome to MRI Technology••
Info
  Sheets


Out-
      side
 



 
 'Magnet' 
SEARCH FOR    
 
  2 3 5 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Result : Searchterm 'Magnet' found in 97 terms [] and 515 definitions []
1 - 5 (of 612)     next
Result Pages : [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20]  [ ... ]
Searchterm 'Magnet' was also found in the following services: 
spacer
News  (897)  Resources  (213)  Forum  (82)  
 
MagnetForum -
related threads
 
A magnet is by definition an object with magnetic properties (magnetism) that attracts iron and produces a magnetic field. It can be a permanent magnet or an electromagnet.
Permanent magnets do not rely upon outside influences to generate their field. In permanent magnets are the atoms and molecules ordered in long range. The specific electron configuration and the distance of the atoms is what lead to this long range ordering. The electrons exist in a lower energy state if they all have the same orientation. Magnetic domains can be likened to microscopic neighbourhoods in which there is a strong reinforcing interaction between particles, resulting in a high degree of order. The greater the degree of ordering within and between domains, the greater the resulting field will be. Long range ordering is one of the hallmarks of a ferromagnetic material.
A current carrying conductor for example a piece of wire, produces a magnetic field that encircles the wire. An electromagnet, in its simplest form, is a wire that has been coiled into one or more loops. This coil is known as a solenoid. The more loops of wire and the greater the current, the stronger the field will be.
Superconducting magnets are a special type of electromagnets, often used in MRI machines with high field strength.
Radiology-tip.comElectromagnetic Radiation
spacer
Radiology-tip.comMagnetic Resonance Guided Focused Ultrasound
spacer
 
• Share the entry 'Magnet':  Facebook  Twitter  LinkedIn  
 
• Related Searches:
    • MRI Equipment
    • Tesla
    • Open MRI
    • Acoustic Noise
    • Faraday Cage
 
Further Reading:
  Basics:
Magnetic Field
   by hyperphysics.phy-astr.gsu.edu    
  News & More:
How Academic Research Solved the Puzzle of MRI and CAT Scanning
Monday, 21 April 2014   by www.engineering.com    
Harvard Scientists Create Nanoscale MRI
Monday, 28 April 2014   by www.meddeviceonline.com    
Searchterm 'Magnet' was also found in the following services: 
spacer
Radiology  (44) Open this link in a new windowUltrasound  (33) Open this link in a new windowMarket  (1) Open this link in a new window
Magnetism
 
Magnetic forces are fundamental forces that arise due to the movement of electrical charge. Maxwell's equations describe the origin and behavior of the fields that govern these forces. Thus, magnetism is seen whenever electrically charged particles are in motion. This can arise either from movement of electrons in an electric current, resulting in 'electromagnetism', or from the quantum-mechanical orbital motion (there is no orbital motion of electrons around the nucleus like planets around the sun, but there is an 'effective electron velocity') and spin of electrons, resulting in what are known as 'permanent magnets'.
The physical cause of the magnetism of objects, as distinct from electrical currents, is the atomic magnetic dipole. Magnetic dipoles, or magnetic moments, result on the atomic scale from the two kinds of movement of electrons. The first is the orbital motion of the electron around the nucleus this motion can be considered as a current loop, resulting in an orbital dipole magnetic moment along the axis of the nucleus. The second, much stronger, source of electronic magnetic moment is due to a quantum mechanical property called the spin dipole magnetic moment.
Gauss (G) and tesla (T) are units to define the intensity of magnetic fields. One tesla is equivalent to 10 000 gauss.
Typically, the field strength of MRI scanners is between 0.15 T and 3 T.
See also Diamagnetism, Paramagnetism, Superparamagnetism, and Ferromagnetism.
Radiology-tip.comGamma Ray,  Electromagnetic Radiation
spacer
Radiology-tip.comSonographic Features,  Echo
spacer

• View the DATABASE results for 'Magnetism' (18).Open this link in a new window


• View the NEWS results for 'Magnetism' (1).Open this link in a new window.
 
Further Reading:
  Basics:
Magnet basics
   by my.execpc.com    
  News & More:
What affects the strength of a magnet?
   by my.execpc.com    
MRI Resources 
Fluorescence - Intraoperative MRI - Shielding - Brain MRI - Colonography - MRA
 
Cryomagnet
 
See Superconducting Magnet.

spacer
 
Further Reading:
  News & More:
A hot time for cold superconductors
Tuesday, 9 December 2003   by www.brightsurf.com    
Searchterm 'Magnet' was also found in the following services: 
spacer
News  (897)  Resources  (213)  Forum  (82)  
 
MAGNETOM 7T
 
From Siemens Medical Systems;
www.healthcare.siemens.com/magnetic-resonance-imaging/7t-mri-scanner/magnetom-7t The MAGNETOM 7T is designed as an open research platform. 7T MRI provides anatomical detail at the submillimiter scale, enhanced contrast mechanisms, outstanding spectroscopy performance, ultra-high resolution functional imaging (fMRI), multinuclear whole-body MRI and functional information.
This ultra high field (UHF) MRI device is a research system and not cleared, approved or licensed in any jurisdiction for patient examinations.


Device Information and Specification
CLINICAL APPLICATION Whole Body
CONFIGURATION Compact
FIELD STRENGTH 7 Tesla
SURFACE COILS High-performance, ultra high field coils available. Integration and support for coil developments.
CHANNELS (min. / max. configuration) 32, optional 8 channels TX array
SPECTROSCOPY Chemical shift imaging, single voxel spectroscopy, multinuclear imaging optional
IMAGING TECHNIQUES iPAT, mSENSE and GRAPPA (image, k-space), noncontrast angiography, plaque imaging, radial motion compensation
FOV 40 x 40 x 30 cm³ <8% nonlinearity
BORE DIAMETER
or W x H
60 cm
TABLE CAPACITY 200 kg
MAGNET WEIGHT (gantry included) 35017 kg
DIMENSION H*W*D (gantry included) 320 x 240 x 317,5 cm
5-GAUSS FRINGE FIELD 7.9 m / 5.6 m
MAGNET TYPE Superconducting
CRYOGEN USE Zero boil off rate
COOLING SYSTEM Water
SLEW RATE up to 200 T/m/s
MAX. AMPLITUDE up to 70 mT/m
SHIMMING Up to 3rd order shim coils, user configurable B0 shim - B0 maps and ROI definition
POWER REQUIREMENTS 2000 Volts, 650A
spacer
 
Further Reading:
  Basics:
MAGNETOM 7T Product Brochure
   by www.healthcare.siemens.com    
  News & More:
Ultra-high-field MRI may allow earlier diagnosis of Parkinson's disease
Wednesday, 5 March 2014   by www.sciencedaily.com    
Feasibility of Using Ultra-High Field (7 T) MRI for Clinical Surgical Targeting
Thursday, 17 May 2012   by www.plosone.org    
Ultrahigh-Field MRI May Detect Additional Pathology in EAE
Sunday, 20 October 2013   by www.msdiscovery.org    
Searchterm 'Magnet' was also found in the following services: 
spacer
Radiology  (44) Open this link in a new windowUltrasound  (33) Open this link in a new windowMarket  (1) Open this link in a new window
Diamagnetism
 
Diamagnetism is a form of magnetism that is only exhibited by a substance in the presence of an externally applied magnetic field. It is the result of changes in the orbital motion of electrons due to the application of an externally applied magnetic field. Applying a magnetic field causes a momentary electromotive force (a consequence of Faraday's law), which modifies the electronic orbitals of atoms/molecules in a substance in such a way, that the orbitals produce an induced magnetic field, which opposes the applied field (a consequence of Lenz's law). However, the induced magnetic moment is very small in most everyday materials.
Diamagnets are repelled by magnetic fields. However, since diamagnetism is such a weak property its effects are not observable in every-day life.
However, in Magnetic Resonance Imaging for example barium sulfate suspensions lead with its weak negative magnetic susceptibility to a decrease in signal. See also magnetism, ferromagnetism, paramagnetism, and superparamagnetism.

spacer

• View the DATABASE results for 'Diamagnetism' (7).Open this link in a new window

 
Further Reading:
  Basics:
Magnet basics
   by my.execpc.com    
Diamagnetism
   by en.wikipedia.org    
MRI Resources 
MRI Technician and Technologist Schools - Pediatric and Fetal MRI - Safety Products - Libraries - Artifacts - Corporations
 
     1 - 5 (of 612)     next
Result Pages : [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20]  [ ... ]
 Random Page
 
Share This Page
FacebookTwitterLinkedIn

MR-TIP    
Community   
User
Pass
Forgot your UserID/Password ?  



Acoustic Noise Reduction (Silent, Quiet, etc.) :
cannot get better 
is in its first steps 
is done by earplugs, headphones 
must get better 
is bad, I miss something 
is unnecessary 

Look
      Ups





MR-TIP.com uses cookies! By browsing MR-TIP.com, you agree to our use of cookies.

Magnetic Resonance - Technology Information Portal
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology-TIP • US-TIP • The-Medical-Market
Copyright © 2003 - 2018 SoftWays. All rights reserved. [ 20 September 2018]
Terms of Use | Privacy Policy | Advertising
 [last update: 2018-03-08 05:11:00]