Yammoto S, Miura S, Shouji Y, Iida H, Kanno I
Shimadzu Corporation.
Kaku Igaku. 1996 Jun;33(6):641-6.
Accidental coincidence rate and scatter coincidence rate of 3-dimensional (3D) acquisition of positron emission tomograph (PET) are higher than 2-dimensional (2D) acquisition and count loss becomes higher because slice shield collimator is not used in 3D acquisition. If one could decrease the gamma ray from outside of the axial field of view (FOV), it may be possible to improve image quality of 3D acquisition. Thus, using a Shimadzu SET-2300W (Headtome V) PET camera, we developed and tested a front shield for brain study to shut off gamma ray from the outside of the axial FOV. Using the front shield, gamma ray from outside of the FOV and the accidental coincidence rate could be decreased. The count loss in high count rate was also decreased. With these effect, the image quality of the clinical studies in 3D acquisition could be increased.
正电子发射断层扫描仪（PET）三维（3D）采集的偶然符合率和散射符合率高于二维（2D）采集，并且由于在3D采集中未使用切片屏蔽准直器，计数损失变得更高。如果能够减少来自轴向视野（FOV）之外的伽马射线，那么有可能提高3D采集的图像质量。因此，我们使用岛津SET - 2300W（Headtome V）PET相机，开发并测试了一种用于脑部研究的前屏蔽，以阻挡来自轴向FOV之外的伽马射线。使用该前屏蔽，可以减少来自FOV之外的伽马射线和偶然符合率。高计数率时的计数损失也有所降低。通过这些效果，可以提高3D采集中临床研究的图像质量。
