Journal of Medical Physics
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Year : 1991  |  Volume : 16  |  Issue : 4  |  Page : 24-26

The Geometry Of Avoiding Beam Intersection In Oblique Field Treatment Technique with mesh Frames



Correspondence Address:
Sathiya.V K Narayanan


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In the radiotherapy of cancer of oesophagus and cancer of bladder, the necessity of three field arrangement is very common. If the patient is positioned in supine position, then during posterior oblique field treatments the mesh frame of the table top in telecobalt machines such as Th-780, Th-780C and PHOENIX, intercepts the field. As this is only a geometrical situation, whether the mesh frame intersects the beam or not is given in the from of a mathematical condition. In case the aluminium frame intercepts the radiation field then an alternative arrangement has to be employed.


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