T1

Question 1

T1 relaxation time represents how protons absorb energy without releasing it back into the surrounding molecule.
A. True
B. False

Answer 1

B. False

Question 2

T1 relaxation time might also be called:
A. Longitudinal relaxation time.
B. Spin-lattice relaxation time.
C. T1 recovery.
D. All of the above.

Answer 2

D. All of the above.

Question 3

T1 relaxation times vary depending on tissue type, but are not affected by magnet field strength.
A. True
B. False

Answer 3

B. False

Question 4

When comparing a T1 curve, a tissue with a quick recovery, or shorter T1, will appear at the top of the curve, such as fat.
A. True
B. False

Answer 4

A. True

Question 5

Does CSF have a shorter or a longer T1 recovery time than compared to fat tissue?

Answer 5

CSF fluid has a longer T1 Recovery than compared to fat tissue.

Question 6

When creating a T1 weighted image, is the TR value to be short or long for recovery time?

Answer 6

T1 weighted images should have a short TR so that anatomy with longer T1 times, such as CSF, have only partially recovery.

Question 7

What is the primary controller of T1 contrast.

Answer 7

TR
As TR increases, the magnetization of the tissue with a short T1 has significantly recovered, if not fully recovered, and anatomy associated with a long T1 continues to recover.

Question 8

T1 weighted images have a short TR but what about the TE

Answer 8

T1 weighted images also have a short TE.

Question 9

What is the purpose of a short TE in a T1 weighted image?

Answer 9

A short TE must be chosen to minimize signal loss caused by T2 relaxation.

Question 10

T1 weighted images have a _____ TR and a _____ TE

Answer 10

Short

Short

Question 11

Because fat has a short recovery time than CSF, how will it appear on a properly weighted T1 image in comparison.

Answer 11

Fat will appear bright and CSF fluid will appear dark on a T1 weighted image.

Question 12

How will water appear on T1 weighted images?

Answer 12

Water will appear dark on T1 weighted images because water has an inefficient energy exchange and a longer longitudinal relaxation time.

Question 13

What is the range of TR on a T1 weighted image?

Answer 13

300 - 600 milliseconds are recommended.

Question 14

How does an image appear in a T1 weighted image if the TR value is too short?

Answer 14

The tissues appear too dark.

Question 15

How does an image appear in a T1 weighted image if the TR value is too long?

Answer 15

All tissues will appear too bright.

Question 16

TR is the primary controller of T1 Contrast.
A. True
B. False

Answer 16

A. True

Question 17

Tissue with a long T1 time appear dark on the final images. Why?

Answer 17

They have only gained a portion of their longitudinal magnetization since the image was acquired.