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    • 1. 发明申请
    • General saddle cone beam CT apparatus and three-dimensional reconstruction method
    • 一般鞍形锥束CT装置及三维重建方法
    • US20070189437A1
    • 2007-08-16
    • US11657027
    • 2007-01-24
    • Haiquan YangMeihua LiKazuhito Koizumi
    • Haiquan YangMeihua LiKazuhito Koizumi
    • H05G1/60A61B6/00G01N23/00G21K1/12
    • A61B6/032A61B6/027A61B6/4441G06T11/006G06T2211/416G06T2211/421
    • A practical X-ray CT reconstruction method with a general saddle which overcomes restrictions in practical applications. A general saddle CT reconstruction method comprises: (a) placing an object relatively to a general saddle defined by the following conditions; (b) moving the X-ray source relatively to the object along the general saddle and detecting projections of the object on the detector plane; (c) filtering the projection along a predetermined filtering plane which is parallel to one of two major axes of the general saddle; and (d) performing three-dimensional reconstruction of the object through backprojection. The saddle curve is defined as such if the saddle curve is defined as such if a simple smooth curve which is single-connected, bounded and closed satisfies the following conditions against a family of continuous parallel planes in a three dimensional space: (1) for any plane in the family of parallel planes, there exist four different intersection points between the plane and the closed curve; (2) the four intersection points form a rectangle; and (3) rectangles obtained for any two different planes in the family of parallel planes are parallel to each other.
    • 一种实用的X射线CT重建方法,具有一般的马鞍,克服了实际应用中的限制。 一般的鞍座CT重建方法包括:(a)相对于由以下条件定义的一般鞍座放置物体; (b)沿着所述普通鞍座相对移动所述物体并检测所述物体在所述检测器平面上的投影; (c)沿着与一般鞍座的两个主轴之一平行的预定过滤平面对突起进行过滤; 和(d)通过反投影进行物体的三维重建。 如果鞍形曲线被定义为如果单连接,有界和闭合的简单平滑曲线对于三维空间中的连续平行平面系列满足以下条件,则鞍形曲线被定义为:(1)对于 在平行平面系列中的任何平面,平面和闭合曲线之间存在四个不同的交点; (2)四个交点形成矩形; 和(3)平行平面中的任何两个不同平面所获得的矩形彼此平行。