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Contrast MediumForum -
there are related threadsInfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.MRI Resource Directory:
 - Contrast Agents -
 
A contrast medium (or contrast agent) is a chemical substance introduced to the anatomical or functional region being imaged, to increase the differences between different tissues or between normal and abnormal tissue, by altering the relaxation times.
The chemical composition of the contrast media determines the specific usage. Similar to nuclear imaging is the intention in development of MR contrast media a high affinity to different organs or even tumors (e.g. necrosis avid contrast agent).
In 'contrast' to nuclear imaging contrast agents MR contrast media do not contain radiopharmaceuticals and the concentrations are about 100 times higher. Nuclear imaging contrast agents are direct contrast agents;; they are directly visible caused by their radioactivity. MR contrast agents affect the targeted tissue; they are indirect contrast agents.
See also Contrast Agents, the info sheet gives an overview and more in-depth information about different types of MRI contrast medium.
 
Images, Movies, Sliders:
 Breast MRI Images T1 Pre - Post Contrast  Open this link in a new window
      
 MRI of the Brain Stem with Temoral Bone and Auditory System  Open this link in a new window
    
SlidersSliders Overview

 
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• View the NEWS results for 'Contrast Medium' (2).Open this link in a new window.

• View the DATABASE results for 'Contrast Medium' (26).Open this link in a new window

 
Further Reading:
  Basics:
Analysis of MRI contrast agents
Thursday, 17 November 2022   by www.sciencedaily.com    
Contrast Agents: Safety Profile
   by www.clinical-mri.com    
Questions and Answers on Gadolinium-Based Contrast Agents
Friday, 9 January 2009   by www.fda.gov    
  News & More:
CT contrast reaction raises MRI contrast risk
Tuesday, 22 February 2022   by www.sciencedaily.com    
Polysaccharide-Core Contrast Agent as Gadolinium Alternative for Vascular MR
Monday, 8 March 2021   by www.diagnosticimaging.com    
GE Healthcare expands MRI contrast media product range in Europe with launch of macrocyclic agent ClariscanTM
Wednesday, 1 March 2017   by www.businesswire.com    
Lawson scientists develop commercial imaging product for PET/MRI scanners
Wednesday, 9 December 2015   by www.news-medical.net    
New oxygen-enhanced MRI scan 'helps identify most dangerous tumours'
Thursday, 10 December 2015   by www.dailymail.co.uk    
Contrast MRIs cause claims, concern, over residual metal in brain
Tuesday, 8 December 2015   by www.afr.com    
A Manganese Alternative to Gadolinium for MRI Contrast.
Friday, 4 December 2015   by www.ncbi.nlm.nih.gov    
Contrast Resolution
 
Low-contrast resolution: The ability to image objects with similar subjects contrast; contrast detectability.
High-contrast resolution: The ability to image small objects having high subject contrast and spatial resolution.
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• View the NEWS results for 'Contrast Resolution' (4).Open this link in a new window.

• View the DATABASE results for 'Contrast Resolution' (6).Open this link in a new window

 
Further Reading:
  Basics:
Image Characteristics and Quality
   by www.sprawls.org    
IMAGE CONTRAST IN MRI(.pdf)
   by www.assaftal.com    
MRI Resources 
Musculoskeletal and Joint MRI - DICOM - Spectroscopy pool - Raman Spectroscopy - Image Quality - Software
 
Contrast Reversal
 
Contrast reversal is an MR image phenomenon where the dark parts become bright, and the bright parts become dark. This is usually most prevalent in sequences utilizing an extended TR.
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• View the DATABASE results for 'Contrast Reversal' (2).Open this link in a new window

 
Further Reading:
  Basics:
MICRO-STRUCTURAL QUANTITIES - DIFFUSION, MAGNETISATION DECAY, MAGNETISATION TRANSFER AND PERMEABILITY(.pdf)
   by www.dundee.ac.uk    
Contrast to Noise Ratio
 
(CNR) In Magnetic Resonance Imaging MRI, Contrast to noise ratio is the relationship of signal intensity differences between two regions, scaled to image noise. Improving CNR increases perception of the distinct differences between two clinical areas of interest. A contrast to noise ratio is a summary of SNR and contrast. It is the difference in SNR between two relevant tissue types.
(A and B): CNR = SNRA - SNRB

See also Signal Intensity, Signal to Noise Ratio and Medical Imaging.
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• View the NEWS results for 'Contrast to Noise Ratio' (1).Open this link in a new window.

• View the DATABASE results for 'Contrast to Noise Ratio' (2).Open this link in a new window

 
Further Reading:
  Basics:
Vascular Filters of Functional MRI: Spatial Localization Using BOLD and CBV Contrast
Contrast mechanisms in magnetic resonance imaging
2004   by www.iop.org    
Optimal k-Space Sampling for Dynamic Contrast-Enhanced MRI with an Application to MR Renography
Thursday, 5 November 2009   by www.ncbi.nlm.nih.gov    
Convolution
 
Convolution is a mathematical way of combining two signals to form a third signal. It is the single most important technique in digital signal processing. This operation is mostly used together with Fourier transformations for MRI signal / image processing.
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• View the DATABASE results for 'Convolution' (2).Open this link in a new window

 
Further Reading:
  Basics:
Convolution
   by www.wam.umd.edu    
Fourier Transforms and 2-D Image Processing
   by robotics.eecs.berkeley.edu    
The Scientist and Engineer's Guide to Digital Signal Processing
  News & More:
New Compressed Sensing Technique to Accelerate MRI Acquisition Process
Tuesday, 9 October 2012   by www.azosensors.com    
MRI Resources 
Resources - Quality Advice - Calculation - Collections - Databases - Intraoperative MRI
 
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