工业CT切片序列任意方向剖面的绘制方法

Arbitrary planes rendering algorithm of industrial CT serial images

为获得工业CT切片序列在三维空间任意方向的剖面,提出了一种基于三维纹理映射技术的任意剖面绘制方法。该方法首先把工业CT图片序列存储为体数据,然后使用传递函数对体数据进行分类,并将分类处理后的体数据定义为三维纹理,结合人机交互给出的平面参数计算出剖切多边形各顶点及其对应的纹理坐标,最后进行纹理映射得到剖面图像。该方法的特点是利用图形处理器支持的纹理映射功能完成剖面像素的采样和插值。实验结果表明,该方法成像质量较高,显示速度较快,能够满足人机交互实际应用需要。

To eliminate the influence of the random background γ spectra on the prompt γ spectra in the associated particle technique,the random background γ spectra induced by non tagged neutrons and the prompt γ spectra induced by tagged neutrons were studied in experiment.Measurements of the random background γ spectra in different condition were analyzed.The methods of acquiring random γ spectra were proposed for the bulk and small sample of different substances.For small sample,the background γ spectra can be obtained without the sample by selecting the same time window as in measuring the prompt y spectra with the sample.In the case of the tagged neutron range less than the volume of the sample,the background γ spectra can be obtained with the sample by selecting the time window during the random time.