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Image Resolution
 
The image resolution is the level of detail of an image and a measurement of image quality. Higher resolution means more image detail, for example when two structures 1 mm apart are distinguishable in an image, this picture has a higher resolution than an image where they are not to distinguish.
More data points in an MR image (with same FOV) will decrease the pixel size, but not accurately improve the resolution because the different MRI sequences influence the contrast and the discernment of different tissues. With high contrast and optimal signal to noise ratio, the image resolution is depend on FOV and number of data points of a picture, but T2* effects have an additional influence.
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Further Reading:
  Basics:
The Basics of MRI
   by www.cis.rit.edu    
  News & More:
Optimizing Musculoskeletal MR
   by rad.usuhs.mil    
Image Selected In Vivo Spectroscopy
 
(ISIS) Image selected in vivo spectroscopy is used as a localization sequence to provide complete gradient controlled three-dimensional localization with a reduced number of sequence cycles, e.g. for in vivo 31P spectroscopy. The ISIS method generates three 180° pulses prior to a 90° pulse, after which the free induction decay is recorded. Specific 180° pulses (slice-selective) are combined and the FID's added or subtracted to generate a spectrum.
An advantage of the ISIS method is that the magnetization (before the final 90° pulse) is predominantly along the z-axis and so T2 effects are relatively small. This explains the value of this technique for 31P data acquisition, because some phosphorus metabolites (e.g. ATP) have short T2 values.
A disadvantage is that eight acquisitions are required to accomplish the spatial localization, therefore the sequence cannot be used for localized shimming. Another problem, because any variation between these data collections (for example, due to movement) will degrade these applications, can be solved by incorporating outer volume suppression techniques such as OSIRIS (modified ISIS).
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MRI Resources 
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Imagent GIInfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.MRI Resource Directory:
 - Contrast Agents -
 
Perflubron® is a perfluorochemical for use as an oral contrast agent. Due to its insolubility in water it does not mix with intestinal secretions; thus bowel lumina appear homogeneously dark on MR images when Perflubron® replaces bowel contents. Filled bowel loops appear black with all pulse sequences because the contrast agent lacks mobile protons.
It is commercially available as Imagent GI. Because rapid transit through the gastrointestinal tract it reaches the rectum within 30 to 40 minutes in most patients. MR imaging of the upper abdominal region should begin within 15 minutes and of the pelvic region 15 to 60 minutes after ingestion of perflubron.

See also Classifications, Characteristics, etc.
Drug Information and Specification
NAME OF COMPOUND
Perfluoroctylbromide
DEVELOPER
CONTRAST EFFECT
Negative enhancement
Proton density reduction, signal void
PHARMACOKINETIC
Gastrointestinal
CONCENTRATION
Water immiscible liquid
DOSAGE
9 mL per kg of body weight
PREPARATION
Finished product
INDICATION
Bowel marking
DEVELOPMENT STAGE
For sale
DISTRIBUTOR
See below
PRESENTATION
Bottle of 200cc
DO NOT RELY ON THE INFORMATION PROVIDED HERE, THEY ARE
NOT A SUBSTITUTE FOR THE ACCOMPANYING PACKAGE INSERT!
Distribution Information
TERRITORY
TRADE NAME
DEVELOPMENT
STAGE
DISTRIBUTOR
USA
Imagent GI®
For sale
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Further Reading:
  News & More:
Slumping MRI market prompts Alliance to halt GI contrast agent effort
Wednesday, 28 September 1994   by www.searchmedica.com    
Imaginary
 
An imaginary number is a component of a complex number (satisfying i2 = - 1). In MRI, complex data are used for example in the Fourier transforms.
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Further Reading:
  Basics:
Complex Number
   by en.wikipedia.org    
Imaginary Number
   by mathworld.wolfram.com    
Imaginary Numbers
 
An imaginary number is a part of a complex number. Complex numbers are an extension of the real numbers. A complex number has a real and an imaginary part. The imaginary unit (i) is equal to the square root of -1. The complex conjugate is a pair of complex numbers with identical real parts and imaginary parts which differ only in sign (e.g.: 3 + 7i and 3 - 7i).
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Further Reading:
  Basics:
Imaginary Numbers
   by en.wikipedia.org    
Imaginary Number
   by mathworld.wolfram.com    
MRI Resources 
Intraoperative MRI - NMR - Mobile MRI - Jobs - Pathology - Brain MRI
 
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