Patent ID: 7935931

Claim:
A radiation image capturing system comprising: a cassette comprising a radiation detector for detecting a radiation having passed through a subject and converting the detected radiation into radiation image information, an image memory for storing the converted radiation image information, a first transceiver for changing a transmission radio-wave intensity at which a test signal or the radiation image information stored in said image memory is transmitted to an external source by way of wireless communications, a battery for supplying electric power to said radiation detector and said first transceiver, and a power switch; and an external controller comprising a second transceiver for receiving the test signal and the radiation image information transmitted from said cassette and transmitting a reception acknowledgement signal to said first transceiver; wherein said power switch is turned on in response to a turn-on command transmitted from said external controller via said second transceiver and then said first transceiver transmits said test signal while changing the transmission radio-wave intensity, and when said second transceiver receives said test signal, said second transceiver transmits said reception acknowledgement signal, and in response to said reception acknowledgement signal, said first transceiver sets a transmission radio-wave intensity of its own to a value at the time said first transceiver received said reception acknowledgement signal, and transmits the radiation image information at the set transmission radio-wave intensity.