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• W1996571863 abstract "Studies on three-dimensional dose distributions in cobalt rotation therapy were made with film dosimetry in a body-shaped phantom of unit density Presdwood with cork “lungs.” The films were sandwiched between the sheets of Presdwood. A calibration film was exposed for each set of films, and all were developed together. Studies were made of the “high-dose region,” defined as the volume enclosed by the 90 per cent isodose line, 100 per cent being the dose at the center of rotation. Our cobalt unit is capable of complete rotation in one plane and limited motion, through 45°, in a plane at right angles to this. The latter movement is termed oscillation. If the beam is first oscillated to a non-vertical position and then rotated, the axis of the beam lies on the surface of a cone at all times. The first study compared simple rotation around a horizontal phantom with a triple rotation, both for 10 × 10-cm. fields. For the latter, the cobalt head was oscillated 20° and then rotated; this was repeated for 20° in the opposite direction, and these were added to complete rotation in the vertical plane. For complete rotation the high-dose region is very nearly a cylinder whose height is equal to the distance between the 90 per cent lines of the isodose chart at the level of the axis, and whose average diameter is 125 per cent of this measurement. Combining rotation in the vertical plane with rotation with the head oscillated each way causes the sides of the cylinder to bulge slightly near the ends. Since, in general, tumors tend to be spherical, neither of these high-dose regions seems satisfactory. If the tumor were completely enclosed by them, some normal tissue adjacent to the tumor would also receive a high dose. These results suggest that an elliptical field should be better for rotation therapy than the conventional rectangular one. An approximation to this shape was made by blocking off the corners of an 8.5 × 11-cm. field to give an eight-sided field, roughly elliptical. Rotation with this field gave a high dose region which approaches the spherical. Elongating either axis changes the sphere to an ellipsoid. The second part of the study will be concerned with the effect of the lungs on the isodose lines in rotation therapy. Preliminary work corroborates Jacob-son's figure of 15 per cent increase in dose to the center of rotation for the average patient. For the unusual situation an exact correction can be calculated by taking a tissue-equivalent thickness of 0.3 of the path through the lung for each beam position used in the calculations." @default.
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• W1996571863 date "1962-01-01" @default.
• W1996571863 modified "2023-09-25" @default.
• W1996571863 title "Three Dimensional Dose Distributions in Cobalt Rotation Therapy" @default.
• W1996571863 doi "https://doi.org/10.1148/78.1.120" @default.
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