Development of the image processing system and the methods of image processing in cineradiography

我们设计并开发了一个数字图像处理系统。在每一帧电影放射线摄影中，电视摄像机被用作X射线图像的输入设备。使用A/D转换器将图像数字化，并由图像处理单元或计算机进行处理。将处理后的图像存储在硬盘单元中，然后在CRT显示器上连续显示。由于对图像进行了不同的处理，我们探索了提高图像质量的可能性。我们发现，使用电视摄像头会降低图像的清晰度，其降低影响数字图像的图像质量。因此，用高分辨率胶片数字化仪(激光扫描仪)代替电视摄像机来获得数字图像。可以得出结论，电视摄像机不适用于医学X射线图像的数字化。临床检查结果表明，采用对数转换的反锐化掩模技术对电影摄影图像进行边缘增强是有效的。此外，动画的构造也是有效的和刺激性的，这些处理可能对提高电影摄影的诊断能力非常有用。

We designed and developed a digital image processing system. A TV camera was used as an input device of an x-ray image in each frame of cineradiographs. The images were digitized using a A/D converter and processed by an image processing unit or a computer. The processed images were stored in a hard disc unit, and then displayed continuously on a CRT display.Since images were processed with different ways, we investigated a possibility of the improvement of image quality.We found the sharpness of the images obtained from this system was reduced by a TV camera used and its reduction affected the image quality of the digital images. Therefore, a high resolution film digitizer (laser scanner) was used to get digital images instead of a TV camera. One can conclude that a TV camera is not useful to digitize the medical x-ray images.As a result of clinical examinations, edge enhancement by using unsharp masking technique with logarithmic conversion was effective for cineradiographs. In addition, the construction of the animation was also effective and stimulative.These processing might be quite useful to improve the diagnostic capability in cineradiography.