Journal of Medical Physics
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Year : 1986  |  Volume : 11  |  Issue : 3  |  Page : 216

Dosimetric Data Analysis Of Interstitial IR- 192 Implants Of Ant 2/3 Tongue Cancer



Correspondence Address:
S M Deore


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The analysis of dosimatric data of particular site Implants and correlating it with the clinical is of great importance towards a standard approach in dose Prescription. The present investigation was undertaken in Ir-192 implants of ant.2/3 tongue. Thirty seven implant cases of ant. 2/3 tongue cancer treated primarily with radiation therapy have been analysed. There are 11 cases of T1 stage and 26 cases of T2 stage. The local control results for T1 lesion were 88% and 42% for T2 lesion. This high rate of failure in local control of T2 lesions raised double about the dose delivery with Ir-192 implants. In the anslysis of decinstris date, more elaborate dose distributions at different levels of each implant, dose rate affect, geographic miss and poor implant geometry factors were studied. The clinical results found, it was concluded that the dose rate influences the clinical out come. After reviewing the dose distributions at the tongue surface level; it use found that in almost all the tongue surface was under dosed by about by about 20 to 30%, However in come of implants, besides under dose on tongue surface geographic miss and poor implant geometry were also the reasons for local failures. Thus in case of tongue implants the doses should be prescribed with the dose distribution at proximal transverse section, under doses or overdoses because of poor implant geometry should be compensated with differential unloading of the implant.


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