Characterization of interpolation effects in cine anatomic and phase-velocity images.
OBJECTIVE
To compare actual and predicted frequency response of reconstruction algorithms applied to anatomic and phase-contrast velocity cine images.


METHODS
Anatomic and phase-contrast velocity segmented cine gradient echo images were collected from a stationary, doped-agarose phantom, using non-phase-contrast cine and phase-contrast cine with one to three directional encodings, one to 16 views per segment, and nearest-neighbor or linear interpolation. Temporal power spectra from object pixels were fit to linear transfer function models; nearest-neighbor interpolation by a sinc function and linear interpolation by a sinc(2) function.


RESULTS
Simple linear transfer function models predicted >98% of the observed power spectral variation. Finite word effects produced small systematic differences at high temporal frequency.


CONCLUSIONS
Temporal power spectra of cine images collected from stationary objects completely characterizes low pass filtration effects of interpolation.
Wood
John C
JC
Division of Cardiology, Children's Hospital of Los Angeles, University of Southern California School of Medicine, Los Angeles, California 90027-0034, USA. jwood@chla.usc.edu
D000465:Algorithms; D006801:Humans; D016014:Linear Models; D019028:Magnetic Resonance Imaging, Cine / Q000379:methods*; D008955:Models, Cardiovascular; D019047:Phantoms, Imaging