ATTENUATION CORRECTION IN POSITRON EMISSION TOMOGRAPHY

正电子发射断层扫描中的衰减校正

• 批准号: 3505487
• 负责人: GERD MUEHLLEHNER
• 金额: $ 5万
• 依托单位: UGM MEDICAL SYSTEMS, INC.
• 依托单位国家: 美国
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-05-01 至 1993-10-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3505487
• 关键词: bioengineering /biomedical engineering; clinical biomedical equipment; data collection methodology /evaluation; gamma radiation; phantom model; positron emission tomography

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 singles gamma-ray emitter with an energy which is somewhat higher than 511 keV so that energy discrimination can be used to separate its energy from that of a positron emitter. This transmission source is shielded towards the nearer detector, allowing higher levels of activity to be used with the aim of reducing the total transmission time while still obtaining adequate statistical accuracy.

正电子发射断层扫描(PET)中的衰减校正通常是 使用传输扫描实现的，该传输扫描通常使用 或包含正电子发射器的几个旋转棒源，例如 GE-68。由于在传输扫描中需要良好的统计信息，因此 成像时间通常为10到20分钟，杆中的活动 信号源是扫描仪国家能力所允许的最高值。 我们建议使用单次伽马射线进行透射式扫描 能量略高于511千电子伏特的发射器 能量辨别可以用来将它的能量与 正电子发射器。此传输源被屏蔽到 更近的探测器，允许使用更高级别的活动 目的是减少总传输时间，同时仍可获得 足够的统计准确性。