| 摘要 |
A machine and procedures for accurately calibrating a mammographic X-ray machine to give accurate, absolute readings of breast tissue density. A sensor to automatically measure the distance apart of the breast retaining plates to a high accuracy, an accurately calibrated sensor to measure the voltage applied to the X-ray tube, an accurately calibrated sensor to measure the current flow to the X-ray tube, A computer interfaced scanning analogue to digital converter to accurately read and store the readings of the spacing sensor and the voltage and current sensors, A digital computer to control and read the scanning analogue to digtal converter, read the radiation detector array used to record the image, to insert the calibration plates to do the calibrations and analyze the data and a program to compute the radiation for optimizing the radiation exposure for a given patient.
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