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ADC MapMRI Resource Directory:
 - Diffusion Weighted Imaging -
 
An ADC map shows parametric images containing the apparent diffusion coefficients of diffusion weighted images. The term apparent refers to the dependence of these coefficients on factors other than prior molecular mobility. Also called diffusion map.
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Further Reading:
  News & More:
Diffusion-weighted MRI in Advanced Epithelial Ovarian Cancer: Apparent Diffusion Coefficient as a Response Marker
Tuesday, 1 October 2019   by pubs.rsna.org    
Adiabatic Fast Passage
 
(AFP) Adiabatic fast passage is a NMR technique of producing rotation of the macroscopic magnetization vector by shifting the frequency of RF energy pulses (or the strength of the magnetic field) through resonance (the Larmor frequency) in a time short compared to the relaxation times. Particularly used for inversion of the spins between high and low energy states with an excess of spins in the higher energy level. A continuous wave NMR technique used in e.g., MR spectroscopy.
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• View the DATABASE results for 'Adiabatic Fast Passage' (3).Open this link in a new window

 
Further Reading:
  Basics:
Adiabatic theorem
   by en.wikipedia.org    
  News & More:
New theory of adiabaticity developed
Tuesday, 2 December 2008   by www.upi.com    
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Most Wanted - Spectroscopy - MRI Technician and Technologist Jobs - Mass Spectrometry - Lung Imaging - DICOM
 
Adiabatic Radio Frequency Pulses
 
Adiabatic RF pulses are amplitude and frequency modulated pulses that are insensitive to the effects of B1-inhomogeneity and frequency offset (conventional RF pulses used in MRI are only amplitude modulated). Due to an extended application time adiabatic RF pulses are mostly used in NMR imaging applications.
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• View the DATABASE results for 'Adiabatic Radio Frequency Pulses' (2).Open this link in a new window

Adiabatic Rapid Passage
 
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Further Reading:
  Basics:
Adiabatic theorem
   by en.wikipedia.org    
Adverse Reaction
 
Any abnormal reaction of a patient to an examination or procedure, like for example claustrophobia or side effects of MRI contrast agents.
A claustrophobic attack is MRI scanner dependent and more rare with an open MRI. An adverse reaction with magnetic resonance imaging contrast medium is very infrequent. In general, adverse reactions increase with the quantity of contrast media (usual dose of paramagnetic contrast agents is 0.1 mmol/kg) and also with the osmolarity of the compound.
Most frequently encountered adverse reactions are heat sensation, dizziness, nausea, hypotension due to vasodilatation, which can progress to hypotensive shock and anaphylactic reactions.
See also MRI Safety, Contrast Enhanced MRI, Breast MRI, and Cardiac MR imaging.
Radiology-tip.comradSafety of Contrast Agents,  Anaphylactoid Reaction
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Medical-Ultrasound-Imaging.comUltrasound Contrast Agent Safety
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• View the DATABASE results for 'Adverse Reaction' (8).Open this link in a new window

 
Further Reading:
  Basics:
Questions and Answers on Gadolinium-Based Contrast Agents
Friday, 9 January 2009   by www.fda.gov    
Contrast Agents: Safety Profile
   by www.clinical-mri.com    
  News & More:
CT contrast reaction raises MRI contrast risk
Tuesday, 22 February 2022   by www.sciencedaily.com    
MRI Resources 
MRCP - Nerve Stimulator - Stimulator pool - IR - Libraries - Software
 
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 [last update: 2024-02-26 03:41:00]