查询词典 orthogonal circle

Proposed a new structure of cone-beam volume CT, which adopts a raster scanning x-ray source on a trough-like surface, and a group of point detectors or linear array detectors distributing on a large circle plus an orthogonal line.

提出一种基于栅形扫描的凹面源和点状或线状探测器的锥形束CT的扫描结构，简称单次旋转的直接体积CT，已申请国家发明专利，申请号为：

First, orthogonal circle operator was modeled in terms of Zernike orthogonal complex moment; the one-to-one mapping between the edge point and the parameters of the circle was established by the algorithm. Then, quadratic polynomial interpolation was adopted to further locate the edge points in the gradient direction.

首先根据Zernike正交复数矩建立圆物体边缘点与边缘参数之间的映射关系，并提取边缘点；然后利用二次多项式插值在梯度方向上对提取出的边缘点进行进一步定位；最后利用最小二乘法拟合插值后的边缘点，得到亚像素精度的圆参数。

It uses a small X-ray tube scanning on a cylinder surface to simulate the trough-like source, and a point detector or a linear array detector moving on a circle and an orthogonal line to acquire the projections.

首先，我们用一个小型的X射线源在凹面上沿"Z"字形扫描，来模拟栅形扫描的凹面源。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。