Tabletop CT system for high-resolution volume imaging

David W. Holdsworth; Maria Drangova; Klaus S. Schulenburg; Aaron Fenster

doi:10.1117/12.18801

1 July 1990 Tabletop CT system for high-resolution volume imaging

David W. Holdsworth, Maria Drangova, Klaus S. Schulenburg, Aaron Fenster

Proceedings Volume 1231, Medical Imaging IV: Image Formation; (1990) https://doi.org/10.1117/12.18801
Event: Medical Imaging '90, 1990, Newport Beach, CA, United States

Abstract

We have constructed a table-top CT system with high spatial resolution in all three dimensions which can be used to analyze excised tissue samples in vitro. Our system uses an x-ray image intensifier, optically coupled to a time delay integration (ThI) CCD to obtain low-noise, low-scatter projection radiographs of the sample volume. Rather than collecting one projection line at a time (as in conventional CT scanners), the architecture of the TDI-CCD allows us to collect 96 image lines simultaneously. The digital radiograph is formed by scanning a slot-beam of radiation across the sample, reducing the detection of scattered radiation without excessive x-ray tube heat loading. Objects to be imaged are placed on a computer-controlled stage and projections are obtained as the sample is rotated. A water bath surrounds the sample to equalize the exposure to the image intensifier, thereby reducing the dynamic range of the input signal. CT reconstruction of this data results in a 512 volume image with 0.13 x 0.13 mm pixels in the transverse plane and a slice thickness of 0.15 mm. This table-top CTscanner has been used to investigate the properties of intact, excised human arterial samples as part of our research into the development of vascular disease.

Citation Download Citation

David W. Holdsworth, Maria Drangova, Klaus S. Schulenburg, and Aaron Fenster "Tabletop CT system for high-resolution volume imaging", Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990); https://doi.org/10.1117/12.18801

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