Skip to main content
This site will look better in a browser that supports web standards, but it is accessible to any browser or Internet device.

QUESTIONS
» Pulse Sequences

How do we change image contrast? What are the effects of parameter changes? This section explores image contrast and image acquisition methods.

« Question list

Weighting in Spin Echo Images

Answer this...

(a) Should TE and TR times be short or long to produce a T1-weighted spin-echo image?
(b) Should TE and TR times be short or long to produce a T2-weighted spin-echo image?

Spin Echo:
Long TR1500+ ms
Short TR250-700 ms
Long TE60+ ms
Short TE10-25 ms
WeightingTRTEflip
T1shortshort90°
T2longlong90°
proton-densitylongshort90°

"Short" and "long" are approximately relative to the T1 and T2 of the tissue to be imaged. Additionally, gradient echo TRs and TEs are generally shorter than that of spin echo pulse sequences. A "short" spin echo TR may still be "long" in a gradient echo pulse sequence.

Further reading on this topic:
Books: MRI From Picture to Proton p30

« Back to Pulse Sequences question list

 
(This page: http://www.revisemri.com/questions/pulse_sequences/se_tr_te)