Imaging with rotating slit apertures and rotating collimators.
Imaging with rotating slit apertures and rotating collimators.
复制标题
使用旋转狭缝孔径和旋转准直器成像。
DOI：
10.1118/1.595171
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发表时间：
1982
期刊：
影响因子：
3.8
通讯作者：
Simpson,RG
中科院分区：
文献类型：
--
作者：
Gindi,GR;Arendt,J;Barrett,HH;Chiu,MY;Ervin,A;Giles,CL;Kujoory,MA;Miller,EL;Simpson,RG
常规核医学图像的统计质量受到通过低效率常规孔径收集的小信号的限制。编码孔径成像通过采用两步过程克服了这一点，在该过程中，物体首先被有效地检测为与物体不相似的“编码”形式，然后被滤波（或“解码”）以形成图像。我们在这里介绍了一类时间调制编码孔径的成像特性，与大多数编码孔径不同，它编码的是物体的投影，而不是物体本身。这些编码孔径可以非断层成像、断层成像（聚焦一个平面）或三维重建体积对象。我们描述了一种新的解码算法，重建的对象从其平面投影。给出了噪声计算的结果，并将这些编码孔径系统的噪声性能与传统系统进行了比较。描述了一种结合了旋转狭缝和针孔成像优点的混合狭缝-针孔系统。一种新的闪烁探测器，它准确地测量一个事件的位置，在一维，它在我们的编码孔径系统中的使用概述。最后给出了实验对象和动物的成像结果。
The statistical quality of conventional nuclear medical imagery is limited by the small signal collect through low‐efficiency conventional apertures. Coded‐aperture imaging overcomes this by employing a two‐step process in which the object is first efficiently detected as an “encoded” form which does not resemble the object, and then filtered (or “decoded”) to form an image. We present here the imaging properties of a class of time‐modulated coded apertures which, unlike most coded apertures, encodeprojectionsof the object rather than the object itself. These coded apertures can reconstruct a volume object nontomographically, tomographically (one plane focused), or three‐dimensionally. We describe a new decoding algorithm that reconstructs the object from its planar projections. Results of noise calculations are given, and the noise performance of these coded‐aperture systems is compared to that of conventional counterparts. A hybrid slit‐pinhole system which combines the imaging advantages of a rotating slit and a pinhole is described. A new scintillation detector which accurately measures the position of an event in one dimension only is presented, and its use in our coded‐aperture system is outlined. Finally, results of imaging test objects and animals are given.