PubMed · 928649
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
E Naylor. 1977. Again about tomography.. https://pubmed.ncbi.nlm.nih.gov/928649/
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
Explore the source record for details and available documents.
Modulation Transfer Functions (MTF) for tomographic imaging with linear, circular, hypocycloidal and spiral motion are given. They may be determined experimentally from tomographs of slits or line pair test patterns. In some cases calculation of the MTF from the blur pattern by Fourier transformation is possible. All tomographic MTFS show the same oscillatory behaviour as MTFS of focal spots, resulting in spurious structures and contours in the tomogram. A quantity named signal/spurios signal ratio (SSR) is introduced as a figure of merit. Effective exposure angles are determined from the MTF and compared with the commmonly used 'geometric' exposure angles which result from maximum tube elongations.
A set of computer programs written for Clincom allow the evaluation of the depth effect in Muehllehner's tomographic camera using MTFs and specificity as well as new quantites. The depth effect of the camera is compared with that of a rectilinear scanner.