11 June 1985 Ectomographic Filtering Applied To Tomographic Digital Subtraction Angiography
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A filtered backprojection reconstruction method suggested by Knutsson et al (1,2) has been applied to circular tomographic DSA (digital subtraction angiography). We have applied this reconstruction technique, termed "ectomography," to phantom data as well as preliminary in vivo studies employing a dog model. The properties of this technique are illustrated using limited angle (20 degree) circular tomography. Both eight and 16 projections were studied with and without subtraction. The infocus depth of field is markedly increased with this technique. This increased depth of field appears to be extremely useful for displaying dilute objects, such as opacified vasculature. However, both noise and reconstruction artefact are increased. The present status of this work and the future directions for reducing these artefacts are discussed.
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B. C. Yih, B. C. Yih, D. N.Ghosh Roy, D. N.Ghosh Roy, R. A. Kruger, R. A. Kruger, S. P.Del Rio, S. P.Del Rio, R. L. Power, R. L. Power, } "Ectomographic Filtering Applied To Tomographic Digital Subtraction Angiography", Proc. SPIE 0535, Application of Optical Instrumentation in Medicine XIII, (11 June 1985); doi: 10.1117/12.947241; https://doi.org/10.1117/12.947241

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