Medical image capturing system

A medical image capturing system comprising:

• a high-voltage generation device including a high-voltage generation unit and a tank that accommodates the high-voltage generation unit in a state of being immersed in first insulation oil;
• an X-ray tube device that applies X-rays, the X-ray tube device including an outer casing that houses a cathode and an anode and a container that accommodates the outer casing in a state of being immersed in second insulation oil;
• an X-ray detector that detects X-rays transmitted through a subject;
• and
• a system control device,
• wherein a moisture-in-oil sensor and a temperature sensor are provided in at least one of the first insulation oil of the high-voltage generation device or the second insulation oil of the X-ray tube device,
• the system control device calculates a water activity value from a moisture-in-oil content measured by the moisture-in-oil sensor and a temperature measured by the temperature sensor,
• in a case in which the subject is imaged without warm-up, the system control device
• presents a tube voltage in a first range in a case in which the water activity value is lower than a threshold value, and
• presents a tube voltage in a second range lower than the tube voltage in the first range in a case in which the water activity value is higher than the threshold value, and
• in a case in which the subject is imaged with warm-up, the high-voltage generation device and/or the X-ray tube device including the moisture-in-oil sensor and the temperature sensor is warmed up.