Mechanical design of detector module subsystems for rotating single source CT gantry

Abstract

This thesis presents the mechanical design and analysis of detector module subsystems for a rotating single-source computed tomography gantry, focusing on detector alignment and heat dissipation. The objective is to develop a feasible concept that integrates medical detector modules, maintains the required imaging geometry, and supports thermal stability. The design is based on fan-beam geometry, mechanical integration requirements, estimated heat loads, material selection, and observations from early prototypes. The detector modules are arranged along a curved arc to meet the required source-to-detector distance, bore clearance, and field-of-view requirements for phantom testing. Defined mounting holes improve positioning repeatability and reduce assembly-related misalignment compared with flexible perforated patterns. The concept also provides electronics support, cable-routing space, airflow paths, and enclosure features for assembly and inspection. A push-pull airflow strategy with additional exhaust ventilation is selected to limit heat accumulation near the electronics. Aluminum 6061-T6 is selected for the main support and enclosure because it balances thermal conductivity, strength, and weight. The proposed subsystem provides a feasible basis for further development of a rotating computed tomography detector assembly. Future work should validate alignment, temperature distribution, airflow, and vibration stability under operating conditions.