IMAGING UNIT, RADIOLOGICAL IMAGE ACQUISITION SYSTEM, AND RADIOLOGICAL IMAGE ACQUISITION METHOD

An imaging unit includes a housing having an entrance window that allows radiation transmitted through an object to pass through, a scintillator having an input surface to which radiation passing through the entrance window is input, and a line scan sensor having an imaging surface that captures an image of scintillation light output from the input surface. The imaging unit further includes a slit member placed between the entrance window and the scintillator and configured to guide radiation passing through the entrance window toward the input surface and a 1X lens placed between the scintillator and the line scan sensor and configured to form scintillation light output from the input surface into an image on the imaging surface of the line scan sensor.