A stationary computed tomography system with cylindrically distributed sources and detectors.

BACKGROUND

The temporal resolution of current computed tomography (CT) systems is limited by the rotation speed of their gantries.

OBJECTIVE

A helical interlaced source detector array (HISDA) CT, which is a stationary CT system with distributed X-ray sources and detectors, is presented in this paper to overcome the aforementioned limitation and achieve high temporal resolution.

METHODS

Projection data can be obtained from different angles in a short time and do not require source, detector, or object motion. Axial coverage speed is increased further by employing a parallel scan scheme. Interpolation is employed to approximate the missing data in the gaps, and then a Katsevich-type reconstruction algorithm is applied to enable an approximate reconstruction.

RESULTS

The proposed algorithm suppressed the cone beam and gap-induced artifacts in HISDA CT. The results also suggest that gap-induced artifacts can be reduced by employing a large helical pitch for a fixed gap height.

CONCLUSIONS

HISDA CT is a promising 3D dynamic imaging architecture given its good temporal resolution and stationary advantage.