Longitudinal magnetisation

Figure 7.10 Images of a section from a worn silicon-breast implant envelope (a) T2-weighted imaged, (b) image of dipolar encoded longitudinal magnetisation...

Figure 2.20. The exponential growth of longitudinal magnetisation is dictated by the time constant Ti and is essentially...

Universal pulses act equally on any initial magnetisation state whereas excitation and inversion pulses are designed to act on longitudinal magnetisation only. The bandwidth factor is the product of the pulse duration. At, and the excitation bandwidth, Af, which is here defined as the excitation window over which the pulse is at least 70% effective (net pulse amplitude within 3 dB of the maximum other publications may define this value for higher levels and so quote smaller bandwidth factors). Use this factor to estimate the appropriate pulse duration for the desired bandwidth. The attenuation factor is used for approximate power calibration and represents the amount by which the transmitter output should be increased over that of a soft rectangular pulse of equal duration. The Gaussian based profiles are truncated at the 1% level. 

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