Patent ID: 7194065

Claim:
A method of adjustment of the entrance dose of a radiology apparatus comprising means for providing an X-ray beam emission, a means for detection of the X-ray beam after it has crossed an object to be imaged, a diaphragm for adjusting the gain of the apparatus, and means for imaging connected to the means for detection, in which the distance between the means for emission and the means for detection is known from the geometry of the apparatus comprising: irradiating the object by the means for X-ray emission; detecting the X-ray beam after it has passed the object using the means for detection of the X-ray beam; estimating the distance between the means for emission and the object; maintaining an appreciably constant equivalent entrance dose irradiating the object in a plane containing the object by acting on the supply parameters of the means for X-ray beam emission in accordance with the estimated distance; and adjusting the gain of the radiology apparatus by the diaphragm; whereby the entrance dose is changed by a factor SOD 2 /SID 2 , where SOD is the estimated distance and SID is the distance between the means for emission and the means for detection.