公开(公告)号：US06259097B1

公开(公告)日：2001-07-10

申请号：US09322295

申请日：1999-05-28

申请人： Lingxiong Shao ,  Jinghan Ye ,  Soo Kuen Hom

发明人： Lingxiong Shao ,  Jinghan Ye ,  Soo Kuen Hom

IPC分类号： G01T120

CPC分类号： G01T1/1644 ,  A61B6/037 ,  A61B6/4258

摘要： A transmission pre-scan of a patient is used in a nuclear medicine imaging system to determine the duration of a subsequent transmission scan of the patient. The transmission scan is for acquiring an attenuation map of the patient to correct emission data of the patient for non-uniform attenuation. As a result, the patient's exposure to radiation during the transmission scan is not excessive, yet transmission image quality is maintained. A radiation transmission source and a radiation detector are operated to perform the transmission pre-scan of the object, during which the transmission source remains in a fixed position. Downscatter correction is applied to correct the transmission pre-scan data for emission contamination. Count values from the pre-scan data are integrated axially. A water-equivalent cross-section value of the patient is then determined based on data acquired from the transmission pre-scan, and the duration of the transmission scan is computed based on the water-equivalent cross-section value.

摘要翻译： 在核医学成像系统中使用患者的透射预扫描来确定患者的后续透射扫描的持续时间。 透射扫描用于获取患者的衰减图，以校正患者的不均匀衰减的发射数据。 结果，患者在透射扫描期间的辐射暴露并不过分，而是保持透射图像质量。 操作辐射透射源和辐射检测器以执行物体的透射预扫描，在此期间透射源保持在固定位置。 应用向下散射校正来校正发射预扫描数据以发射污染。 来自预扫描数据的计数值被轴向积分。 然后，基于从发送预扫描获取的数据来确定患者的水当量横截面值，并且基于水当量横截面值计算发送扫描的持续时间。