Four-Dimensional Imaging Based on a Single-slice Spiral CT Scanner / 实用放射学杂志

ABSTRACT

Objective To explore the theory and method of 4-dimensional (4D) imaging based on a spiral CT scanner. Methods The experiments were carried out on a Toshiba Asteion TSX-021A scanner with a motion phantom which consisted of a platform and some tumor-like plastic balls driven by a step-motor in sine mode to simulate respiration. The gantry rotation cycle, pitch and slice thickness were 1.5 s, 0.6 and 3 mm,respectively,according to radiotherapeutic application. Data processing including 3D image reformation and phantom centroid tracing were accomplished on a treatment planning system TOPLANE WiMRT V1.0. Results The phantom experiments demonstrated that the quality of a reformatted 3D image was better than that of a conventional reconstructed 3D image apparently for its less motion artifacts, and the measured centroid locus of the balls based on 4D imaging was closed to the actual motion process. Conclusion 4D imaging based on a single-slice spiral CT scanner is feasible.