Figure 2.

For prepared magnetization which is a mono-exponential decay of TSL with constant T1rho decay rate, EPG algorithm was used to simulate the signal profile during SSFSE echo train with various constant refocusing flip angle trains ranging from 75 to 180 degree and various excitation RF pulse flip angle ranging from 60 to 120 degree. The logarithm of the signal at a given echo along the echo train was plotted as a function of the time-of-spinlock. Note all these signal profiles have same constant slope, which characterizes T1rho decay. TSL, time-of-spinlock; EPG, extended phase graph; SSFSE, single shot fast spin echo.