关键词: 多层螺旋CT, 图形处理器, 纹理映射, 心电图, 实时绘制

Abstract: The heartbeat timeline information can be acquired by MDCT (multi-detector computed tomography) via ECG (electro-cardio-gram) gating process, but conventional CPU-based volume rendering methods cannot meet the requirement of dynamic cardiac real-time reconstruction. A GPU-based texture mapping method is therefore proposed to achieve it by introducing the ECG gating process with MDCT to acquire multi-groups cardiac volume data, where each of them is called a time-phased data and mapped onto a GPU texture unit step for step. Material and illumination properties color and opacity of transfer function computed by GPU are separately mapped onto another two GPU texture units. Then, textures are looked up via fragment programs to implement the resultant image. According to time interval during data acquisition, volumetric data textures are switched over time to get a beating heart. Experimental result showed that the method proposed can reconstruct a dynamic cardiac real-time rendering, where image quality of it is good enough to meet clinical requirements.