of echoes the transient bssfp device is coupled to a computer capable of calculating the distinct rf flip angle for the nth echo in the series of echoes the computer calculation utilizes a program encoding an analytical inversion of the bloch equation once the rf flip angle is calculated it is used by the transient bssfp device in the generation of the nth echo application_number US 66067610 A description according to the invention a better or full utilization includes 1 using a series of variable flip angles to convert all of the longitudinal magnetization to transverse magnetization while 2 maintaining a predefined arbitrary signal profile shape over the acquisition block fig1 demonstrates the main idea of this invention with a specific example a uniform signal profile shape vuse m transverse is set as a target and achieved by using a series of non linearly increasing flip angles the signal amplitude is maximized such that the longitudinal magnetization at the end of the acquisition block is close to zero i e it is used up the invention introduces the forward calculation of flip angles directly from desired echo amplitudes for bssfp and is demonstrated by an analytical closed form expression that returns the flip angle.