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The accompanying picture is of a device to be used on the tube head of the profexray® lowvoltage therapy x-ray apparatus. It is intended as a simplified device for centering the x-ray beam and measuring the focus-skin distance.
As may be noted in the picture, the filter carrier is employed to hold the centering and measuring rod. The filter carrier is a nonconductive material, such as plastic. It fits snugly in a slot provided for it in the tube head. With the filter carrier in place, the lucite® disk, about the size of a quarter in diameter, is in the center of the x-ray beam. The measuring rod, bent at its lower end at an angle of 90 degrees, is inserted into the side of the disk so that the rod tip is seen at the exact center. The rod slips easily up and down through its
ROSS MS. MEASURING AND CENTERING DEVICE FOR USE ON X-RAY MACHINE. AMA Arch Derm Syphilol. 1952;65(2):231–232. doi:10.1001/archderm.1952.01530210110015
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