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MRI Forum
'Gradient'
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Charlie McIntyre

Tue. 17 Apr.12,
16:28

[Start of:
'High Field Open MRI systems/Spatial Gradient limits'
0 Reply]

 
  Category: 
Safety
 
High Field Open MRI systems/Spatial Gradient limits
Anyone out there operating a Philips HFO or Hitachi Oasis? If so how is your facility handling the new FDA labeling of MR "conditional" limits of certain implants(stents, shunts, etc..) and the Higher Spatial Gradient Forces that these machines have? thanks.
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Elise Gough

Wed. 23 Feb.11,
17:25

[Start of:
'6-1.5T MAGNETS, DIFFERING GRADIENTS'
7 Replies]

 
  Category: 
Applications and Examinations
 
6-1.5T MAGNETS, DIFFERING GRADIENTS
What parameter, if any, can compensate between magnets of equal field strength but very different gradient strengths? A T2 FAT sequence on one magnet can look very different on another magnet using same parameters.
 
 

Elise Gough RT(R)(CT)(MR)
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Angela Hoskinson

Thu. 22 Jan.09,
03:19

[Start of:
'Gradient modes'
1 Reply]

 
  Category: 
Applications and Examinations
 
Gradient modes
Does changing the gradient mode from "fast" to "whisper" have an effect on the image quality? I just did a PD FS on a knee and compared two sequences that were exactly the same except for one was "fast" and the other was "whisper", which also changed the TR and TE very slightly (TR from 1970 - 2100 and TE from 29 - 31). The whisper sequence was noticeably lower quality and I can't figure out why.
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Reader Mail

Sun. 5 Oct.08,
03:48

[Start of:
'gradient preemphasis'
0 Reply]

 
  Category: 
Equipment
 
gradient preemphasis
Is the gradient preemphasis still used in the up-to-date MRI scanner equipped with the shielded gradient coil? Does the preemphasis become unnecessary in the future, or is it continued to be used?
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Anton Troitskii

Thu. 24 Sep.20,
03:48

[Start of:
'Contrast in GRE'
0 Reply]

 
  Category: 
Basics and Physics
 
Contrast in GRE
I have found an explanation of GRE contrast in the book "MRI, The Basics - Ray Hashman Hashemi, William G. Bradley Jr., Christopher J. Lisanti - 3rd Ed. Chapter 20. Gradient Echo: Part I (Basic Principles)". Here is a link with a screenshot https://photos.app.goo.gl/88e2iJ7amEQTWg1r9rnA "> https://photos.app.goo.gl/88e2iJ7amEQTWg1r9rnA "longer TR enhances T1 weighting". And a table in the end of the chapter. But there is a contraversions opinion in other sources. For example, http://www.mri-q.com/spoiled-gre-parameters.html.rnrnThere is described that "The lengthening of TR cause increase PD weighting, and shortening TR increase T1 weighting".
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