| 摘要 |
A computed tomography imaging system includes a source of radiation and a detector that produces an output signal representing sensed radiation from the source. Prior to using the system to produce an image, the source produces a pulse of radiation and the detector output signal is periodically sampled until the output signal has decayed to a negligible level. These samples form values which define a standard response of the detector. Thereafter when image samples are acquired, a decaying output signal from detector is sampled after radiation production terminates. The decay samples are compared to the standard response and coefficients defining the comparison are found. The coefficients and the standard response data are used to derive compensation values which are arithmetically applied to the image samples thereby producing compensated samples. An image is reconstructed from the compensated samples.
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