When a 90 degree RF pulse is applied, it rotates
net magnetization vector M into the x-y or transverse plane , entire vector is located in that plane and its value along the z-axis is zero. Following cessation of the RF pulse , the nuclei returns towards their equilibrium magnetization. M rotates back from the x-y plane to the z-axis and M returns to to the initial magnetization at some finite time latter. The process of returning towards the equilibrium magnetization costitutes T1 rlaxation or longitudinal relaxation. The process is cused by release of energy into the surrounding tissue ( i.e., into the molecular environment or lattice around the proton ). Hence this relaxation is also known as spin-lattice relaxation.
net magnetization vector M into the x-y or transverse plane , entire vector is located in that plane and its value along the z-axis is zero. Following cessation of the RF pulse , the nuclei returns towards their equilibrium magnetization. M rotates back from the x-y plane to the z-axis and M returns to to the initial magnetization at some finite time latter. The process of returning towards the equilibrium magnetization costitutes T1 rlaxation or longitudinal relaxation. The process is cused by release of energy into the surrounding tissue ( i.e., into the molecular environment or lattice around the proton ). Hence this relaxation is also known as spin-lattice relaxation.
.jpg)
No comments:
Post a Comment