MRI in Practice Chapter 2

Front

Intrinsic contrast parameters are as follows

Back

T1 recovery time

T2 decay time

Proton density (PD)

Flow

Apparent diffusion coefficient (ADC).

Front

Extrinsic contrast parameters are

Back

TR

TE

Flip angle

TI

Turbo factor/echo train length

b value.

Front

relaxation

Back

as soon as the B1 field is removed, hydrogen nuclei are only under the influence of B0. hydrogen nuclei return to their low-energy state and their magnetic moments dephase

Front

During relaxation

Back

hydrogen nuclei give up absorbed RF energy, and the net magnetic vector (NMV) returns to B0

Front

T2 decay

Back

occurs 5–10 times faster than T1 recovery.

Front

T1 recovery.

Back

The recovery of longitudinal magnetization is caused by a process

Front

T2 decay

Back

The decay of coherent transverse magnetization

Front

T1 recovery

Back

This type of relaxation is called spin–lattice energy transfer.

Front

T1 recovery time

Back

the time it takes for 63% of the longitudinal magnetization to recover in a tissue

Front

T2 decay

Back

by the magnetic fields of neighboring hydrogen nuclei interacting with each other.