最近的技术蓬勃发展，以下通过在强磁场，从而影响PET图像分辨率和衰减校正领域的改变正电子的运动技术障碍。
The technology recently blossomed following passing a technical hurdle of altered positron movement in strong magnetic field thus affecting the resolution of PET images and attenuation correction.
通过实验获得了声相位图与声幅度图，并通过数字图像处理获得了相应的速度图与衰减图。
After processing the amplitude image and phase image which was come from experiment we obtain the distribution of the velocity and attenuation.
射线穿过物体的衰减是非线性的，经过影像系统得到的图像灰度与物体厚度是非线性的关系；
The attenuation of X-ray through the object is non-linear and the gray level of image is non-linear response of object thickness.
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