Collimator Interchange System for Adaptive Cardiac Imaging in C-SPECT.
Collimator Interchange System for Adaptive Cardiac Imaging in C-SPECT.
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DOI：
10.1109/nssmic.2010.5874138
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发表时间：
2010
影响因子：
1.8
通讯作者：
Chang W
中科院分区：
文献类型：
--
作者：
Rozler M;Chang W
与传统相机的心脏成像相比，专用心脏SPECT系统可以通过使用小视场实现更高的性能。然而，为了实现这一潜力，在成像之前，心脏必须可靠地放置在适当的小视野中，因此需要单独的侦察操作来定位心脏并估计其大小。此外，为了在普通人群中实现高性能，系统应该提供几种针对心脏的不同大小和位置以及患者大小进行优化的成像配置。由于准直器在SPECT中起着至关重要的作用，如果能为每个不同的患者组使用一个专用的准直器，以及用于侦察成像，那将是最理想的。在不移动患者的情况下更换准直器的能力还可以在保留解剖配准的同时，使用不同的成像选项进行系列研究。我们研制了一套用于C-SPECT心脏平台狭缝准直器的狭缝交换系统。全尺寸原型是一种沿着弯曲的身体轮廓路径的精密链接式传送器，允许四种不同的横轴准直选项。准直器可以在10秒内更换，而不会干扰患者，从而允许自适应临床SPECT成像。该系统所有元件的定位精度都在0.1毫米以内，并且在传送带旋转100,000圈时没有出现退化--是临床系统预期使用的两倍。我们认为，快速而精确的操作使得不同成像任务的最佳准直是心脏SPECT的重要技术步骤。
Compared to imaging the heart with conventional cameras, dedicated cardiac SPECT systems can achieve much higher performance through use of a small field of view. To realize this potential, however, the heart must be reliably placed in the appropriate small FOV prior to imaging, thus requiring a separate scout operation to locate the heart and estimate its size. Further-more, to achieve high performance across the general population, a system should provide several imaging configurations optimized for different size and location of the heart and the size of the patient. Because of the critical role the collimator plays in SPECT, it would be ideal if a dedicated collimator could be used for each of the different patient groups, as well as for the scout imaging. The ability to exchange collimators without moving the patient can also enable serial studies with different imaging options while preserving anatomic registration. We developed a slit exchange system for the slit-slat collimator of the C-SPECT cardiac platform. The full-scale prototype, a precision link conveyor following a curved, body contouring path, allows four distinct transaxial collimation options. The collimators can be exchanged in 10 seconds without disturbing the patient, thus allowing adaptive clinical SPECT imaging. The positioning precision for all elements of the system is within 0.1 mm and has shown no degradation over 100,000 complete revolutions of the conveyor—twice the expected usage for a clinical system. We consider the rapid and precise operation allowing optimal collimation for different imaging tasks to be an important technological step for cardiac SPECT.