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.

提出一種基于柵形掃描的凹面源和點狀或線狀探測器的錐形束CT的掃描結構日韩一级aa大片免费视频，簡稱單次旋轉的直接體積CT一级毛片a人爱免费视频性色，已申請國家發(fā)明專利黄色网站免费观看。，申請?zhí)枮椋?/p>

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.

首先根據(jù)Zernike正交復數(shù)矩建立圓物體邊緣點與邊緣參數(shù)之間的映射關系真人抽搐一进一出gif免费404，并提取邊緣點18岁免费看黄片；然后利用二次多項式插值在梯度方向上對提取出的邊緣點進行進一步定位又黄又粗又大又长又色又爽；最后利用最小二乘法擬合插值后的邊緣點国产老人性交黄片，得到亞像素精度的圓參數(shù)。

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.

首先黄片久久久久久久，我們用一個小型的X射線源在凹面上沿"Z"字形掃描91高清国产在线，來模擬柵形掃描的凹面源。