| 摘要 |
In an imaging device, a cooling unit cools an imaging element. A storage unit stores table data representing correspondence relationships between signal values based on luminescences of detection targets, cooling temperatures, exposure times, and S/N ratios. A S/N calculating unit calculates a S/N ratio at a time when pre-imaging has been performed. A determination unit determines, from the table data and as a cooling temperature and an exposure time for the imaging, a combination of a cooling temperature and an exposure time with which the S/N ratio becomes equal to or greater than the reference S/N ratio on the basis of a result of comparison between the calculated S/N ratio and a predetermined reference S/N ratio. A control unit controls the imaging element and the cooling element such that a subject is imaged at the cooling temperature and in the exposure time that are determined.
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