| 摘要 |
<p>A transmission source (10) serves to detect activity from a radiation source (12) for correcting attenuation in either PET mode or SPECT mode. The transmission source includes a detector (18) dedicated to collecting attenuation data in PET mode. The transmission source can either be a coincidence transmission source or a singles transmission source and includes a collimator (24) in which is disposed a radiation source. An opening (26) is defined by the collimator. Positioned behind the radiation source, relative to the opening, is the dedicated attenuation detector. In SPECT mode, the point source is selected to have sufficiently high energy to shine through a patient and the collimators associated with an imaging detector.</p> |
