What does it mean to find t2 signal by magnetic vibration?

Difference between T 1 and T2 in NMR * * *

1, T 1 have better observation of anatomical structure.

2.T2 showed better tissue damage.

3. Water is a long T 1 long T2, while fat is a short T 1 long T2.

4. The long T 1 is black and the short T 1 is white.

5. The long T2 is white and the short T2 is black.

6. Water T 1 is black and T2 is white.

7. Fertilizer T 1 white, T2 gray.

8. T2 is very sensitive to bleeding, because water T2 is white.

T 1 weighted imaging, T2 weighted imaging

The so-called weight is "outstanding"

T2-weighted imaging (T2WI)-Highlight the T2 relaxation (transverse relaxation) difference of tissues. T 1 weighted imaging (T 1WI)- the difference of T1relaxation (longitudinal relaxation) of prominent tissues.

In any image sequence, the larger the transverse magnetization vector during signal acquisition, the stronger the MR signal. T 1 weighted image is short TR, short TE-T 1 weighted image, T 1 image characteristics: the shorter the tissue T 1, the faster the recovery and the stronger the signal; The longer the tissue T 1, the slower the recovery and the weaker the signal.

T2-weighted image length TR, long TE-T2-weighted image, T2-weighted image characteristics: The longer the T2 of the tissue, the faster the recovery.

The slower, the stronger the signal; The shorter T2, the faster recovery and the weaker signal.

Proton density weighted image length TR and short TE- proton density weighted image, image characteristics: the greater the rH of the tissue, the stronger the signal; The smaller the relative humidity, the weaker the signal. White matter: 65% gray matter: 75% cerebrospinal fluid: 97%

There are many more, all of which are in Baidu library.