Title :
Optimal scan for time-varying tomography. II. Efficient design and experimental validation
Author :
Willis, N. Parker ; Bresler, Yoram
Author_Institution :
Cardiac Pathwaths Corp., Sunnyvale, CA, USA
fDate :
5/1/1995 12:00:00 AM
Abstract :
For pt.I see ibid., vol.4, no.5, p.642-53 (1995). In pt.I the authors presented a theoretical analysis of tomographic reconstruction of objects with spatially localized temporal variation, such as a thorax cross section with a beating heart. That analysis showed that by using an optimally scrambled angular sampling order, the scan rate required to avoid motion artifacts in the reconstructed images can be lowered as much as four times while preserving image quality. Here, the authors present a simple design procedure for the optimum choice of angular sampling pattern, which depends only on pre-specified geometric and spectral parameters and the desired spatial resolution. The resulting patterns have a simple congruential structure. Reconstruction is accomplished by interpolation to standard time-invariant scan format, followed by conventional reconstruction. The interpolation only requires linear shift-invariant separable filtering, at a negligible computational cost. Simulation results demonstrate the technique and validate the analysis for both bandlimited and approximately bandlimited objects
Keywords :
biomedical NMR; computerised tomography; image reconstruction; medical image processing; X-ray tomography; approximately bandlimited objects; beating heart; interpolation; linear shift-invariant separable filtering; magnetic resonance imaging; medical diagnostic imaging; motion artifacts; optimal scan; optimally scrambled angular sampling order; prespecified geometric/spectral parameters; reconstructed images; simple congruential structure; simple design procedure; spatially localized temporal variation; standard time-invariant scan format; thorax cross section; time-varying tomography; tomographic reconstruction; Heart; Image analysis; Image motion analysis; Image quality; Image reconstruction; Image sampling; Interpolation; Motion analysis; Thorax; Tomography;
Journal_Title :
Image Processing, IEEE Transactions on