ATTENUATION CORRECTION IN POSITRON EMISSION TOMOGRAPHY

正电子发射断层扫描（PET）中的衰减校正通常是 使用透射扫描来实现，该透射扫描通常使用一个 或包含正电子发射体如Ge的几个旋转棒源， 68.由于在传输扫描中需要良好的统计数据， 成像时间通常为10至20分钟 源是尽可能高的扫描仪计数能力允许。 我们建议用单根伽马射线进行透射扫描 发射体，即Cs-137，其具有662 keV的能量，即稍微 因此，可以使用能量鉴别来分离其能量 与正电子发射器的能量不同因为只有透射的伽马射线 使用和源是屏蔽对较近的探测器，更高 因此可以获得更短的透射扫描。期间 在第一阶段，我们已经证明，高质量的透射扫描可以 只需2分钟即可完成。 建议的商业应用：完成的单打传输 使用Cs-137源的装置将成为一种有价值的改进， UGM Medical Systems制造的PENN-PET扫描仪， 进行衰减校正， 考试时间。该技术可能适用于所有PET 扫描仪

Attenuation correction in positron emission tomography (PET) is usually achieved using a transmission scan, which is typically performed with one or several rotating rod sources containing a positron emitter such as Ge- 68. Since good statistics is required in the transmission scan, the imaging time is typically 10 to 20 minutes and the activity in the rod sources is as high as the scanner countrate capability permits. We propose to perform the transmission scan with a singles gamma-ray emitter, namely Cs-137, which has an energy of 662 keV, i.e. somewhat higher so that energy discrimination can be used to separate its energy from that of a positron emitter. Since only the transmitted gamma-rays are used and the source is shielded towards the nearer detectors, higher countrates and therefore shorter transmission scan can be obtained. During the Phase I we have demonstrated that high quality transmission scans can be achieved in as little as 2 minutes. PROPOSED COMMERCIAL APPLICATION: The completed singles transmission apparatus using a Cs-137 source will become a valuable enhancement for the PENN-PET scanners manufactured by UGM Medical Systems, improving the ease of performing attenuation correction and reducing the total patient examination time. The technique is potentially applicable to all PET scanners.