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Application of the chirp z-transform to MRI data.

Kaffanke J, Dierkes T, Romanzetti S, Halse M, Rioux J, Leach MO, Balcom B, Shah NJ

Institute of Medicine, Research Centre Jülich, D-52425 Jülich, Germany.

A version of the chirp z-transform (CZT) enabling signal intensity and phase-preserving field-of-view scaling has been programmed. The algorithm is important for all single-point imaging sequences such as SPRITE when used with multiple data acquisition for T2* mapping or signal averaging. CZT has particular utility for SPRITE imaging of nuclei with short relaxation times such as sodium at high field. Here, a complete theory of the properties of CZT is given. This method operates entirely in k-space. It is compared with a conventional interpolation approach that works in image space after the application of a fast Fourier transformation.

Published 12 December 2005 in J Magn Reson, 178(1): 121-8.
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