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MRI Forum
'Signal Intensity'
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Result: Searchterm 'Signal Intensity' found in 5 messages
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marc jupin

Thu. 26 Mar.15,
09:03

[Start of:
'receiver gain in siemens trio'
0 Reply]


 
  Category: 
Sequences and Imaging Parameters

 
receiver gain in siemens trio
Hi, we measured a phantom with two receiver gain option: LOW and HIGH (available from parameters).
We would like to calculate the difference in signal intensity, but unfortunately the rda files headers do not contain any information about the receiver gain value.
Does anyone have a clue how I could find the receiver gain value?
Thanks.
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Anna Lena Golay

Wed. 25 Jan.12,
20:59

[Reply (3 of 7) to:
'Imaging optic neuritis'
started by: 'Karen Lesley'
on Wed. 18 Jan.12]


 
  Category: 
General

 
Imaging optic neuritis
A 2-3 mm STIR sequence through the optic nerves may show the characteristic high-signal intensity of optic neuritis. Gadolinium enhanced T1-weighted fat-saturated (to suppress the bright signal of the orbital fat tissue) images of the orbits show the inflammation of the optic nerve. White matter lesions, which denote a higher risk of developing MS, are typical imaged with FLAIR and T2-weighted images (hyperintense lesions), or show enhancement of T1-weighted images postcontrast.
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Azza Ahmed

Thu. 8 Jul.10,
10:42

[Start of:
'exceeding slew rates'
0 Reply]


 
  Category: 
Sequences and Imaging Parameters

 
exceeding slew rates
Can someone please let me know what happens to the MRI signal intensity if any of the gradient's slew rate was exceeded?
 
 

Azza AhmedrnPhD student
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Reader Mail

Tue. 6 Mar.07,
22:48

[Start of:
'fluid PD vs T2 weighting'
1 Reply]


 
  Category: 
Sequences and Imaging Parameters

 
fluid PD vs T2 weighting
Can anyone explain me, why - considering SE sequences with the same TR - fluid in a PD weighting (short TE) should have less signal than in a T2 weighting (long TE)? eg:
Fig 10, p 1397; radiographics resident tutorial: contrast mechanisms in spin echo MR imaging; Radiographics 1994; 14; pp 1389-1404

I would expect that the signal intensity of any tissue (regardless of it Proton density of T2-relaxation time) should decrease with increasing echo time.

Thank you
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Reader Mail

Mon. 30 Oct.06,
16:25

[Reply (1 of 2) to:
'interleaved slices and mean intensity difference in adjacent slices'
started by: 'Reader Mail'
on Wed. 4 Oct.06]


 
  Category: 
General

 
interleaved slices and mean intensity difference in adjacent slices
With interleaved slice acquisition for example in each TR first the odd slices, and then the even slices are acquired. Differences in signal intensity may occur by changes between these acquisitions (like movement), especially with a long TR. In particular, for fMRI sequences with interleaved slice acquisition a slice time correction is recommended to get accurate measurements.
However, I think "large" signal intensity differences with interleaved slices (except fMRI) are rarely seen with usual sequences and sufficient processing (interpolation) algorithms.
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