A simplified approach for the generation of projection data for cone beam geometry |
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Authors: | TUSHAR ROY P S SARKAR AMAR SINHA |
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Institution: | (1) Osaka Prefecture University, 1-1 Gakuencho, Nakaku, Sakai Osaka, 599-8531, Japan;(2) Osaka Butsuryo College, 3-33 Otori Kitamachi, Nishiku, Sakai Osaka, 593-8328, Japan |
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Abstract: | To test a developed reconstruction algorithm for cone beam geometry, whether it is transmission or emission tomography, one
needs projection data. Generally, mathematical phantoms are generated in three dimensions and the projection for all rotation
angles is calculated. For non-symmetric objects, the process is cumbersome and computation intensive. This paper describes
a simple methodology for the generation of projection data for cone beam geometry for both transmission and emission tomographies
by knowing the object’s attenuation and/or source spatial distribution details as input. The object details such as internal
geometrical distribution are nowhere involved in the projection data calculation. This simple approach uses the pixilated
object matrix values in terms of the matrix indices and spatial geometrical coordinates. The projection data of some typical
phantoms (generated using this approach) are reconstructed using standard FDK algorithm and Novikov’s inversion formula. Correlation
between the original and reconstructed images has been calculated to compare the image quality. |
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Keywords: | |
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