Journal of Medical Physics
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Year : 1996  |  Volume : 21  |  Issue : 1  |  Page : 31-34

Optimisation Of Dose Distribution In Single Planar Iridium Inplants



Correspondence Address:
S Ramkumar


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Source of Support: None, Conflict of Interest: None


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Single planar 'interstitial implants aim to irradiate 10 mm thickness of tissue to uniform dose. Interstitial iridium implants are normally practised with the same linear activity throughout the implant. As a result, the peripheral regions of the implant get lesser dose contribution from the central wires. Out study with the Planning System for a 5 x 4 cm2 area of parallel implant geometry shows that the peripheral regions receive only 83% of the prescribed dose and the minimum treated thickness is 7.6 mm only. increasing either the activity or time weight to the peripheral wires by 25% enables the peripheral regions to receive a minimum of 92% of the prescribed dose and the minimum treated thickness increases to 8.80 mm. The removal time of peripheral wires with time weight option can be calculated manually by a simple formula.


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