Patent ID: 8637829
Filing Date: 2014-01-28
Classification: G03B,H04N

Abstract:
1. An image acquisition device enabling a dental radiological image to be obtained, the device comprising: a matrix sensor integrating: a plurality of image acquisition photodiodes integrated in the form of a matrix, said image acquisition photodiodes being sensitive to radiation, and at least one detection photodiode integrated at the periphery of the matrix of acquisition photodiodes, said at least one detection photodiode being likewise sensitive to radiation, the at least one detection photodiode supplying an analog data read signal representative of energy received on the detection photodiode; an analog to digital processing unit configured to receive the analog data read signal and to supply a digital periodic output signal comprising pulses representative of instantaneous received energy; a control module configured to control the sensor and to read the detection photodiode periodically so as to obtain the periodic output signal during irradiation and image acquisition by the acquisition photodiodes, the periodic output signal being used to analyze the energy received during acquisition and to cause the sensor to change over between at least two modes: a standby mode in which the acquisition photodiodes are inhibited; and an acquisition mode in which the energy received by the acquisition photodiodes is used for acquiring an image; wherein the changeover between the two sets of modes is triggered as soon as the instantaneous received energy indicates that the detection photodiode has detected radiation from a generator, and wherein the control module is also configured to modify the resolution of the detection photodiode as a function of the periodic output signal from the detection photodiode in order to ensure that the detection photodiode does not saturate during irradiation.