Cone
Description
Cones from early Siemens shield and protect areas that don’t need to be treated. Early linear accelerators in the 1960s had adjustable collometers that could make smaller or larger rectangles based on patient’s treating area. With these tubes no such adjustments were possible– you had to pick an applicator with a shield that shielded off the corners. There was high energy on the shielding tray. The evolution was from cones that were put into machines, to manually adjusted shields built into the machine, to treatments programmed into the computer. It was highly labour intensive positioning the blocks into the right tray. They used customised Perspex which slotted into early linear accelerators. They would have been used for over 30 to 40 treatments.
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