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Comparison of different sequences and flip angles used for excretory MR urography

Comparison of different sequences and flip angles used for excretory MR urography

(a) On a coronal MIP image from excretory MR urographic data obtained with a 3D interpolated fat-suppressed gradient-echo sequence (VIBE/THRIVE/LAVA) during breath holding, soft-tissue suppression is minimized owing to the use of a relatively low flip angle of 12°. (b) Coronal MIP image from excretory MR urographic data obtained with a 3D gradient-echo MR angiographic sequence shows improved background tissue suppression due in part to the use of a higher flip angle of 40° (Leyendecker et al 2008)

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