Patent ID: 7593507

Claim:
A radiation image capturing system comprising: a cassette having a radiation detector for detecting a radiation that has 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 transmitting the radiation image information stored in said image memory to an external controller by way of wireless communications at a transmission radio-field intensity based on a command radio wave from the external controller, and a battery for supplying electric power to said radiation detector and the first transceiver; and the external controller having a second transceiver for transmitting said command radio wave and receiving the radiation image information transmitted from said cassette; wherein when said first transceiver of the cassette starts to transmit the radiation image information to said second transceiver of the external controller, said first transceiver transmits a test radio wave, and said second transceiver calculates a minimum transmission radio-field intensity of said first transceiver which is required to receive the radiation image information, from a received intensity of said test radio wave, and transmits the command radio wave representing a command indicative of the calculated minimum transmission radio-field intensity to said first transceiver.