T2

Question 1

T2 weighted images are also known as _____ _____.

Answer 1

Pathology scans

Question 2

T2 weighted images use what two types of echo sequences?

Answer 2

Spin-echo Sequence

Gradient-echo Sequence

Question 3

Gradient echo sequences are susceptible to magnetic field inhomogeneities.
A. True
B. False

Answer 3

A. True

This is called a T2*

Question 4

What is the T2 relaxation percentage?

Answer 4

63%

This is the time it takes the transverse magnetization to be lost.

Question 5

How long does it take for a tissue to lose ALL transverse magnetization.

Answer 5

It takes 5 times the T2 time for a tissue to lose ALL transverse magnetization.

Question 6

T1 and T2 relaxation occur simultaneously but _____ decay is always faster than T1 relaxation.

Answer 6

T2

Question 7

T2 relaxation time is also known as:

Answer 7

Transverse relaxation time.
Spin-spine relaxation time.
T2 decay.

Question 8

If fat relaxation time in a T2 sequence is 80 ms, then how long will it take to lose all transverse magnetization in a 1.5T magnet.

Answer 8

Fat will take 400 ms to lose all transverse magnetization because it take 5 times.

Question 9

In a 1.5T magnet, T_ decay times for any tissue are always shorter than T_ decay times for the same tissue. Fat loses coherence, or phase, very quickly

Answer 9

T2
T1

In this example, fat only takes 80 ms to lose 63% of its transverse magnetization.