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Methodologies for Medical Computing. Computers for Medical Imaging and Graphics: Computer Tomosynthesis: A Versatile Three-Dimensional Imaging Technique

机译:医学计算方法。用于医学成像和图形的计算机:计算机断层合成:多功能的三维成像技术

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摘要

Tomosynthesis permits the representation of internal structures of an object by an arbitrary number of frontal sections (tomosynthetic slices), from a finite set of radiographs, each imaging the object at a different projection angle. Tomosynthetic reconstructions produce a sharp image of structures lying in the desired tomosynthetic slice, on which blurred images of object detail lying outside the plane of interest are superimposed. Slice thickness is largely determined by the projection angle. Advantageous features of tomosynthesis are the limited size of the projection angle required, the selective positioning of the tomosynthetic plane after recording of the radiographs, and the computational simplicity permitting real-time implementation. Applications to dental radiography demonstrate the feasibility to synthesize tomographic slices with a thickness of about 3 mm from as few as 8 radiographs exposed on a circular projection cone with half-angle of 4.5°. The reconstructions not only indicate the relative spatial position of the dental tissues, but also show clinically relevant structures not visible in the original radiographs.
机译:断层合成允许从有限的X射线照片中通过任意数量的额叶(断层合成切片)来表示对象的内部结构,每个断层图像均以不同的投影角度对对象进行成像。断层合成重建产生位于所需断层合成切片中的结构的清晰图像,在该图像上叠加了位于感兴趣平面之外的对象细节的模糊图像。切片厚度在很大程度上取决于投影角度。断层合成的有利特征是所需的投影角度的大小有限,在射线照片记录后断层合成平面的选择性定位以及计算的简便性允许实时实现。在牙科放射线照相中的应用证明了可行性,该技术是从在8个半角为4.5°的圆形投影锥上曝光的8幅放射线照片合成厚度约为3 mm的断层摄影切片的可行性。重建不仅指示了牙组织的相对空间位置,而且还显示了在原始X射线照片中不可见的临床相关结构。

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