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'Proton'
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Brenna Bray

Tue. 10 Mar.20,
15:59

[Start of:
'Proton excitation from B0 to B1'
0 Reply]


 
  Category: 
General

 
Proton excitation from B0 to B1
I'm new to MRI imaging and currently taking an introductory course online. I understand that the introduction of a small magnetic field/RF pulses on top of the static magnetic field (B0) excites protons into a high energy state (B1). Does this mean that the protons are excited from a spin that is parallel to the longitudinal B0 plane to one that is antiparallel to the longitudinal B0 plane, or that the proton spin is excited from one that is aligned/polarized with B0 to one that is either parallel or antiparallel to B0 in the B1/xy plane?
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Jacquelyn Chiffons

Thu. 18 Mar.10,
14:51

[Start of:
'Proton Density Imaging'
1 Reply]


 
  Category: 
Sequences and Imaging Parameters

 
Proton Density Imaging
Is Proton Density Imaging considered Fast Spin Echo?
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Anne Nelson

Tue. 8 May.07,
02:09

[Start of:
'Proton Density and FOV'
2 Replies]


 
  Category: 
Sequences and Imaging Parameters

 
Proton Density and FOV
I've been told that proton density sequences don't work well with a large field of view. (approx 350-400) Is this the case, and why?

Thanks in advance,

Annika
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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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Imran Chunawala

Sun. 14 Jul.19,
04:14

[Start of:
'MRI-PDFF'
1 Reply]


 
  Category: 
General

 
MRI-PDFF
I'm a research nurse conducting a clinical research study for Non Alcoholic Steatohepatosis in which an MRI-PDFF (Proton Density Fat Fraction) is required for study participants. How is this MRI different from a regular MRI? I have called multiple MRI locations in the area and no one seems to even know the existence of such a specialized MRI.

Internet research has led me to understanding that a specialized software is needed to calculate the PDFF from the MRI images but I'm not sure how that works.

If anyone has experience with conducting such an MRI or can point me in the right direction, I would be grateful.
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