Application of Mechatronics Principles to the Design of an Automated Tomography Scanner Positioning System for a Teaching Hospital in Enugu State

Computed tomography scanner patient positioning systems in Nigerian teaching hospitals frequently rely on manual adjustments that introduce positioning inaccuracies and extend preparation time, reducing scanner throughput and patient comfort. This study applies mechatronics engineering principles to the design of an automated patient positioning system for the CT scanner installation at the University of Nigeria Teaching Hospital in Enugu State, South East Nigeria. The design integrates servo motor-actuated gantry table movement in three translational axes, controlled by a PLC-based motion controller that accepts position inputs from the radiographer's console. A laser alignment system provides real-time feedback for isocenter positioning accuracy. Safety interlocks based on force-sensing load cells in the table surface detect unintended contact and halt motion to prevent patient injury. The positioning system design was simulated using SOLIDWORKS motion analysis to validate kinematic accuracy and dynamic load capacity at the full patient weight range of up to 150 kilograms. Positional accuracy of the simulated system at target scan coordinates was within 0.5 millimetres in all three axes, meeting the IEC 60601-2-44 standard for CT scanner table positioning. The study discusses the mechatronics design integration challenges arising from compliance with medical device safety standards and electromagnetic compatibility requirements for hospital environments. A phased implementation plan with estimated capital and installation costs is provided for the teaching hospital administration. Keywords: CT scanner, patient positioning, servo control, medical mechatronics, Enugu State