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A pictorial description of steady-states in rapid magnetic resonance imaging


Scheffler,  K
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Scheffler, K. (1999). A pictorial description of steady-states in rapid magnetic resonance imaging. Concepts in Magnetic Resonance, 11(5), 291-304. doi:10.1002/(SICI)1099-0534(1999)11:5<291:AID-CMR2>3.0.CO;2-J.

Magnetic resonance imaging in biochemical and clinical research requires rapid imaging sequences. Time-resolved imaging of heart movement and the acquisition of a three-dimensional image block within the circulation time of a contrast agent bolus are two typical examples. Rapid imaging sequences are characterized by a very fast train of radiofrequency (rf) and gradient pulses. Between these rf pulses, the excited magnetization is unable to return to its thermal equilibrium. As a consequence, further rf pulses will influence both the remaining transversal and the remaining equilibrium state. The steady-state magnetization of a multi-rf pulse and gradient pulse experiment is thus a mixture or superposition of different transversal and longitudinal states and the acquired image amplitude becomes a complex function of the investigated tissue's relaxation properties. Based on the works of Woessner, Kaiser, and Hennig, this article intends to give a pictorial description of rapid multipulse imaging experiments. It also provides an extension of this theory applied to modern imaging sequences such as TRUE FISP and rf-spoiled techniques.