Radiography Irradiation Range Detection Using Optical and Depth Imaging

The patent introduces an optical camera and distance sensor as intermediary devices to capture images and depth information of the subject. These sensors provide objective measurement data about the subject's anatomy and the irradiation range, serving as a mediator between the collimated light and the operator's judgment. The captured images and distance data allow precise determination of whether specific parts are included in the irradiation range, overcoming the limitation of visual confirmation alone.

The patent replaces the purely visual/mechanical method of confirming irradiation range with an optical measurement system. Instead of relying on human visual judgment of collimated light edges, the system uses optical cameras and distance sensors to capture and measure the irradiation range objectively. This substitution of mechanical/visual methods with optical measurement technology enables precise determination even in the presence of uneven anatomical features.

The patent implements a feedback mechanism where the optical camera and distance sensor continuously monitor the subject's position and the irradiation range. The system compares the captured images and distance data with the planned irradiation range, and provides feedback to automatically adjust the collimator settings. This feedback loop ensures that sensitive parts such as the eyeball are excluded from the irradiation range while maintaining the largest possible useful irradiation area for diagnostic purposes.

The patent performs preliminary identification of sensitive parts (such as the eyeball) using optical imaging and distance measurement before radiation exposure. The system pre-calculates the irradiation range to exclude identified sensitive parts, and only then proceeds with radiation exposure. This preliminary action prevents harmful radiation exposure to sensitive structures while maximizing the useful irradiation area for diagnostic imaging.