基于小波变换的X射线图像超动态范围重建

针对小动态范围X射线成像设备提出一种X射线图像超动态范围重建方法.将成像对象进行两次不同球管电压下的低剂量曝光,对两次曝光得到的图像进行多分辨率小波分解.根据一定规则重构分解系数,将重构的系数进行小波逆变换重建一幅宽动态范围图像.实验表明,该方法能有效扩展图像的灰度动态范围,并且两次低剂量曝光并未增加患者皮肤表面吸收剂量.

Image with Super Dynamic Rangeby Wavelet Transform

A technique for X ray image reconstruction with super dynamic range is proposed for X ray imaging systems with limited gray dynamic range.Two original images of the same object at different tube voltages are obtained. The images are decomposed by wavelet transform. The wavelet coefficients of the two images are recomposed.And an image with large dynamic range is reconstructed by the inverse wavelet transform of the recomposed coefficients. Experiments show that this technique can effectively extend the gray dynamic range of X ray image without increasing patient dose.