| 摘要 |
A SPECT system includes two radiation detector heads (32) and (34) which are mounted opposite each other to a gantry (30) for rotation about a subject. The subject is injected with a source of emission radiation, which emission radiation passes through a collimator (38) mounted on each detector head and is received by a radiation receiving face of the detector heads. A radiation source (40) is disposed between the collimator (38) of one detector head and the face of the one detector head. Transmission radiation from the radiation source (40) passes through the collimator (38), through the subject, and is received by the opposite detector head concurrently with the emission radiation. Alternately, a radiation source (40) is disposed behind the collimator of both detector heads (32, 34) such that both detector heads concurrently receive emission and transmission radiation. The detector heads (32, 34) generate emission and transmission projection data indicative of the received emission and transmission radiation. A sorter (70) sorts the emission and transmission projection data and the data is stored into a projection view memory (72). The emission data is corrected (78) in accordance with the transmission data and into a three-dimensional image representation (80).
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