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1·Objective To improve HIFU focal spot accuracy.

目的：提高HIFU焦斑精度。

2·There are no evident energy gain when the focal spot size is too big or small.

电子的能量增益有一个最佳焦斑大小。

3·The focal spot, size depend on the pinhole diaphragm diameter of spatial filter.

光斑尺寸和空间滤波系统的针孔光阑直径有关。

4·The sizes of focal spot and detector aperture are the factors affecting ct image quality.

射线源焦点及探测器孔径大小是导致CT图象降质的主要因素。

5·Using this focusing system, the laser microbeam instrument has got the focal spot size of less than 0.

用这个激光聚焦系统，激光微束仪能获得直径小于0。

6·From the result we can see that using this method we can get high accuracy in the focal spot measuring.

设计结果表明，利用旋转椭球面进行大口径取样镜设计可以使焦斑测量具有极高的准确性。

7·The measurement method and error analysis method of GRIN lens focal spot diameter in IR wavelength are described.

主要介绍GRIN透镜在红外波段聚焦光斑直径的测量方法及误差分析。

8·Can focus sunlight in the focal plane, the formation area of different sizes and brightness of different focal spot.

可以把太阳光聚焦在焦面内，形成面枳大小不同和亮度不同的焦斑。

9·Under the different laser parameters, the electron energy gain depends on the laser intensity, focal spot size and pulse width.

不同激光参鼍条件下，得到了电子的能量增益与激光强度、焦斑大小和脉冲宽度关系。

10·The focal spot sizes can immediately influence picture definition when X-ray machine carry through clairvoyance and photography.

焦点的尺寸大小及聚焦质量直接影响X射线机透视、摄影图像的清晰度；

焦点

1·The sizes of focal spot and detector aperture are the factors affecting ct image quality.

射线源焦点及探测器孔径大小是导致CT图象降质的主要因素。

2·The focal spot sizes can immediately influence picture definition when X-ray machine carry through clairvoyance and photography.

焦点的尺寸大小及聚焦质量直接影响X射线机透视、摄影图像的清晰度；