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British Journal of Radiology (1989) 62, 927-931
© 1989 British Institute of Radiology
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The British Journal of Radiology, Vol 62, Issue 742 927-931, Copyright © 1989 by British Institute of Radiology

ARTICLES

Asymmetric field arc rotations

JR Palta, KM Ayyangar, N Suntharalingam and L Tupchong
Department of Radiation Oncology, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania 19107.

Optimal treatment planning of target volume that surrounds a vital critical structure is often very difficult. Treatment techniques using moving beam therapy with fields asymmetric with respect to rotational axis of the collimator head allow treatment of such target volumes with minimal dose to critical structures. The availability of independent motion of the collimator jaws on new medical accelerators allows easy setting up of asymmetric treatment portals. Therefore, treatment techniques utilizing asymmetric field arc rotations with acceptable dose distributions have been possible.




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