Search Engines & Resources for Medical Transcription
MT911 - Your Transcription Helpline Search Engines & Resources for Medical Transcription
Subscribe to
Email Updates
Name:
Email:
Search:
|

MRI Related Terms

- L -

  • LARMOR EQUATION

  • An equation that states that the frequency of precession of the nuclear magnetic moment is directly proportional to the product of the magnetic field strength (Bo) and the gyromagnetic ratio (g). This is stated mathematically as = g Bo.

  • LARMOR FREQUENCY

  • The frequency at which magnetic resonance in a nucleus can be excited and detected. The frequency varies directly with magnetic field strength, and is normally in the radio frequency (RF) range.

  • LATTICE

  • In MRI, the magnetic and thermal environment through which nuclei exchange energy in longitudinal (T1) relaxation.

  • LONGITUDINAL MAGNETIZATION

  • The component (MZ) of the net magnetization vector in the direction of the static magnetic field. After RF excitation, this vector returns to its equilibrium value at a rate characterized by the time constant T1.

  • LONGITUDINAL RELAXATION

  • Return of longitudinal magnetization to its equilibrium value after excitation due to the exchange of energy between the nuclear spins and the lattice.

  • LONGITUDINAL RELAXATION TIME

  • The time constant, T1, which determines the rate at which excited protons return to equilibrium within the lattice. A measure of the time taken for spinning protons to re-align with the external magnetic field. The magnetization will grow after excitation from zero to a value of about 63% of its final value in a time of T1.


Tell a Friend

MRI Terms


Home | Search | Sitemap | Tell a Friend | Contact Us | Disclaimer
MTHelpLine | MTSetup | MTDictionary | MTSamples | MedicalTranscriptionSamples
Designed for IE.
Best viewed in 1024 x 768