Dubey Nitin, Rosen Joseph, Gannot Israel
Opt Express. 2020 May 11;28(10):15122-15137. doi: 10.1364/OE.391713.
Partial aperture imaging is a combination of two different techniques; coded aperture imaging and imaging through an aperture that is only a part of the complete disk, commonly used as the aperture of most imaging systems. In the present study, the partial aperture is a ring where the imaging through this aperture resolves small details of the observed scene similarly to the full disk aperture with the same diameter. However, unlike the full aperture, the annular aperture enables using the inner area of the ring for other applications. In this study, we consider the implementation of this special aperture in medical imaging instruments, such as endoscopes, for imaging internal cavities in general and of the human body in particular. By using this annular aperture, it is possible to transfer through the internal open circle of the ring other elements such as surgical tools, fibers and illumination devices. In the proposed configuration, light originated from a source point passes through an annular coded aperture and creates a sparse, randomly distributed, intensity dot pattern on the camera plane. A combination of the dot patterns, each one recorded only once, is used as the point spread hologram of the imaging system. The image is reconstructed digitally by cross correlation between the object intensity response and the point spread hologram.
部分孔径成像结合了两种不同的技术；编码孔径成像和通过仅为完整圆盘一部分的孔径进行成像，这种孔径通常用作大多数成像系统的孔径。在本研究中，部分孔径是一个环，通过该孔径成像能够像具有相同直径的完整圆盘孔径一样分辨观察场景的小细节。然而，与全孔径不同，环形孔径使得能够将环的内部区域用于其他应用。在本研究中，我们考虑在医学成像仪器（如内窥镜）中实现这种特殊孔径，以用于一般内部腔体的成像，特别是人体内部腔体的成像。通过使用这种环形孔径，可以通过环的内部开放圆传输其他元件，如手术工具、光纤和照明设备。在所提出的配置中，源自源点的光穿过环形编码孔径，并在相机平面上创建一个稀疏、随机分布的强度点图案。每个仅记录一次的点图案的组合用作成像系统的点扩散全息图。通过物体强度响应与点扩散全息图之间的互相关来数字重建图像。
