Abstract
Spin echo imaging suffers from long acquisition times, especially for T2 weighting. Hence, there is a need for rapid alternatives. Since imaging time is linearly related to TR, one would be tempted to compress TR for time savings. This action (everything else held constant) poses two problems: low overall signal and poor tissue contrast, since we slide leftward on the T1 curve (Fig. 38). The ingenious solution is to disengage tissue saturation and tissue contrast from the influence of TR, using excitation pulses (θ) less than 90° (partial flip angle).
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© 2009 Springer-Verlag Berlin Heidelberg
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(2009). Gradient Echo Imaging. In: Clinical MR Imaging and Physics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-78023-6_17
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DOI: https://doi.org/10.1007/978-3-540-78023-6_17
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-77999-5
Online ISBN: 978-3-540-78023-6
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