Application of the chirp z-transform to MRI data.
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.
Kaffanke
J
J
Institute of Medicine, Research Centre Jülich, D-52425 Jülich, Germany.
Dierkes
T
T
Romanzetti
S
S
Halse
M
M
Rioux
J
J
Leach
M O
MO
Balcom
B
B
Shah
N J
NJ