AN AUTOMATIC PATIENT-CONTOUR MEASURING APPARATUS

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Abstract
All optical-electronic system has been developed as a new approach to the task of measuring and recording patient contours. The system projects 2 slightly convergent light beams onto the patient. The resultant light spots are detected by a photomultiplier tube that is located behind a rotating slit wheel. The photomultiplier produces pulses that are analyzed to generate a voltage proportional to distance. An extremely stable system results from the use of time-dependent pulsed circuitry. The voltage generated by the system is used to drive the pen of a polar-coordinate recorder, while its table is synchronized to the rotation of the cobalt 6o unit in which the optical portion of the system is mounted.The polar recorder has 2 channels, one of which is used to plot patient contours, while the other is used in conjunction with a transmission ionization chamber to record transmission dose or the "equivalent" homogeneous contour. The recorder is mounted in a portable utility cabinet and can be used in the ther...

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