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Circular CT in combination with a helical segment.

Bontus C, Koken P, Köhler T, Proksa R

Philips Research Europe—Hamburg, Sector Medical Imaging Systems, Röntgenstraße 24-26, D-22 335 Hamburg, Germany.

The combination of circular CT with a helical trajectory segment results in a mathematically complete data set. We present a reconstruction algorithm which is mathematically exact and of the filtered back-projection type. The algorithm ensures that only Radon planes which are not covered along the circle are taken into account, when data from the helical segment are back-projected. Therefore, the helical segment contributes only to low-frequency parts of trans-axial slices. Data along the helix can be obtained with a very low acquisition dose.

Published 21 December 2006 in Phys Med Biol, 52(1): 107-120.
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