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Result : Searchterm 'Resonance' found in 29 terms [] and 140 definitions []
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Resonance
 
The exchange of energy at a particular frequency between two systems; a large amplitude vibration in a mechanical or electrical system caused by a relatively small periodic stimulus with a frequency at or close to a natural frequency of the system.
Resonance is referred to as the property of an atom to absorb energy only at the Larmor frequency. The energy must also be delivered at 90° to the net magnetic vector (NMV) and main magnetic field (B0). Otherwise, no energy will be absorbed, resonance will not have occurred and an image cannot be created. In MRI systems, resonance can refer to the MR itself or to the tuning of the RF circuitry.
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Further Reading:
  News & More:
Magnetic resonance imaging before ablation for atrial fibrosis helps predict success of treatment
Sunday, 1 September 2013   by medicalxpress.com    
Viewpoint: Silicon Nanowires Feel the Force of Magnetic Resonance
Sunday, 12 February 2012   by physics.aps.org    
Magnetic resonance lithography
Tuesday, 6 August 2013   by spie.org    
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On Resonance
 
A state occurring when the Larmor frequency of a spin isochromat is the same as that of the exciting RF field.

See also Magnetization Transfer Contrast.
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Off Resonance
 
A state occurring when the Larmor frequency of a spin isochromat is different from that of the exciting RF field.

See also Magnetization Transfer Contrast.
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Factors influencing flip angle mapping in MRI: RF pulse shape, slice-select gradients, off-resonance excitation, and B0 inhomogeneities.
Tuesday, 1 August 2006   by www.ncbi.nlm.nih.gov    
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Resonance Offset
 
Either the phase due to an applied field or field inhomogeneity and generated during the time between two RF pulses, or the phase change of the RF pulse from one pulse to the next.
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Magnetic Resonance
 
(MR) Resonance phenomenon resulting in the absorption and/or emission of electromagnetic energy by nuclei (for that reason also nuclear magnetic resonance) or electrons in a static magnetic field, after excitation by a suitable RF magnetic field.
The peak resonance frequency is proportional to the magnetic field, and is given by the Larmor equation. Only unpaired electrons or nuclei with a spin exhibit magnetic resonance. The absorption or emission of energy by atomic nuclei in an external magnetic field after the application of RF excitation pulses using frequencies, which satisfy the conditions of the Larmor equation.
The magnetic resonance phenomenon may be used in one of these ways:
By manipulation of the external field (application of gradient fields), the resonance frequency can become dependent on spatial location, and hence images may be generated (MRI).
The effect of the electron cloud in any atom or molecule is to slightly shield the nucleus from the external field, thus giving any chemical species a characteristic frequency. This gives rise to 'spectra' where nuclei in a molecule give rise to specific signals, thus facilitating the detection of individual chemicals by means of their frequency spectra (MRS)
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Further Reading:
  Basics:
Magnetic Resonance Imaging, History & Introduction
2000   by www.cis.rit.edu    
  News & More:
The 2003 Nobel Prize in Physiology or Medicine
2003   by www.nobel.se    
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