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Delayed-Focus Pulses Optimized Using Simulated Annealing

โœ Scribed by Jun Shen

Book ID
102595456
Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
88 KB
Volume
149
Category
Article
ISSN
1090-7807

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โœฆ Synopsis

Unlike prefocused pulses and shaped pulses based on the linear response theory, delayed-focus pulses (X.-L. Wu et al., 1991, Magn. Reson. Med. 20, 165--170) produce a selective spin echo after a predefined short delay without using a pi refocusing pulse. In this paper, a series of delayed-focus pulses of different flip angles are proposed based on optimization using Fourier series representation and simulated annealing. The resistance of these delayed-focus pulses to T(2) relaxation is also demonstrated using numerical simulation of Bloch equations.

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