How is TE selected as long or short?

  • Context: Undergrad 
  • Thread starter Thread starter Ian Martin
  • Start date Start date
  • Tags Tags
    Short
Click For Summary

Discussion Overview

The discussion revolves around the selection of echo time (TE) in the context of magnetic resonance imaging (MRI) and its relationship to T2 imaging. Participants explore how TE length is determined and its implications for image quality.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions how TE length is selected, noting that a long TE is said to provide a good T2 image.
  • Another participant suggests that TE is controlled by adjusting the timing of gradients used in the imaging process, indicating that moving the refocusing time later results in a later TE.
  • There is a humorous interjection about the translation of "TE echo," which does not contribute to the technical discussion.
  • A participant clarifies that TE and TR are parameters that characterize image acquisition techniques in MRI, with TE affecting sensitivity to T2 and TR affecting sensitivity to T1.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the terms TE and T2, with some clarifications provided. However, there is no consensus on the specific mechanisms of TE selection, and the discussion remains somewhat unresolved.

Contextual Notes

Some participants appear to have different levels of familiarity with the terminology and concepts related to MRI, which may affect the clarity of the discussion.

Ian Martin
Messages
1
Reaction score
0
Hi

Apparently a long TE gives a good T2 image yet how is TE length selected?

If I stand in a cave and shout I don’t control the time that the echo gets back to me, right?

Cheers

Ian
 
Physics news on Phys.org
:welcome:

If you want a good answer, you'll have to do much better writing the question. I don't know what you mean by TE and T2.

Ian Martin said:
If I stand in a cave and shout I don’t control the time that the echo gets back to me, right?

You select where in the cave you stand. But standing in one place, the time for the echo returns depends on the distance to the cave walls.
 
  • Like
Likes   Reactions: sophiecentaur
Ian Martin said:
Apparently a long TE gives a good T2 image yet how is TE length selected?
TE is selected by controlling when your gradients are refocused. You can control the gradients so you can control TE. If you move the refocusing time later then the TE will be later

Ian Martin said:
If I stand in a cave and shout I don’t control the time that the echo gets back to me, right?
It isn’t that kind of an echo.
 
Hahaha. So the topic is magnetic resonance imaging. TE and TR are two numbers used to characterize image acquisition techniques and T1 and T2 are two numbers used to characterize tissues. The TE (echo time) alters the sensitivity to T2 (transverse relaxation) and the TR (repetition time) alters the sensitivity to T1 ( longitudinal relaxation).
 
  • Like
Likes   Reactions: berkeman
Oh! I knew that of course...:sorry:
 

Similar threads

Replies
3
Views
15K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 24 ·
Replies
24
Views
4K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 8 ·
Replies
8
Views
13K
  • · Replies 27 ·
Replies
27
Views
4K