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'Meter'
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Nancy Dudek

Fri. 26 Aug.05,
00:25

[Start of:
'3T imaging parameters'
2 Replies]


 
  Category: 
Sequences and Imaging Parameters

 
3T imaging parameters
Hi
Am looking for the ranges of acceptable TR and TE's for standard spin echo and gradient echo sequences on a 3T.
Does anyone know these or tell me where I can find this info?
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Gina Key

Sat. 27 Jan.24,
09:33

[Reply (1 of 2) to:
'IDEAL sequence help'
started by: 'gianluca turcatel'
on Mon. 10 Jan.22]


 
  Category: 
General

 
IDEAL sequence help
To calculate the Proton Density Fat Fraction (PDFF) from MRI images of the liver acquired using LMS IDEAL (Iterative Decomposition of Water and Fat with Echo Asymmetry and Least Squares Estimation) with optimized low flip angles, you'll typically have multiple image sets corresponding to different echoes. The fat and water signals are separated based on their chemical shift differences. Look for image sets labeled as Water, Fat, or PDFF (Proton Density Fat Fraction). Depending on the software or DICOM tags used, the images may be explicitly labeled, or you may need to review the sequence parameters to determine which set corresponds to fat or water.
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Dan Lopez

Sun. 27 Aug.23,
00:03

[Start of:
'Improving MEDIC/MERGE/M-ffe and GRE/FFE image quality'
1 Reply]


 
  Category: 
Sequences and Imaging Parameters

 
Improving MEDIC/MERGE/M-ffe and GRE/FFE image quality
I work on an Ingenia Elition Philips scanner. I'm having trouble with Axial C-spine sequences for both M-ffe and FFE. On the M-ffe there is always motion in the cord and the contrast is poor. With the FFE the closer we get to the lungs the worse the quality becomes. There is usually loss of signal and the image doesn't look uniform. I've tried a bunch of different parameter combinations to try giving it more signal and contrast while decreasing the motion in the cord but it never seems to look that good. Any suggestions would be appreciated.
 
 

Mffe & FFE
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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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William Richardson

Tue. 20 Jun.17,
12:33

[Start of:
'MRI 1w/kg sequences Siemens Avanto FIT'
0 Reply]


 
  Category: 
Sequences and Imaging Parameters

 
MRI 1w/kg sequences Siemens Avanto FIT
I have recently been asked to build protocols for Spines and extremities that are 1 watt per kilogram SAR. In speaking with Applications at Siemens they inform me that I can only change certian parameters to help lower SAR but it will all be dependent upon each patient and which sequences are running. I need to present to our MRI QA commitiee if we can or if we cannot do 1w/kg SAR as we are determining if we can scan cochlear implants? Does anyone have any ideas or solutions?
 
 

Thank You
Will R.
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