Journal of Medical Physics
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Year : 1991  |  Volume : 16  |  Issue : 4  |  Page : 1-4

Design And Dosimetric Aspects Of Wedge Shaped Mid-Line Block For Treatment Of Early Stage Cervical Cancers

Correspondence Address:
J S Avadhani

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Source of Support: None, Conflict of Interest: None

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Since 1989 a new protocol has been initiated for stage Ib, Ila and Ilb for radical irradiation of cancer of the uterine cervix. The irradiation consists of AP/PA external beam delivering 40 Gy in 20 fraction over 4 week period (includes initial 10 Gy open field and subsequent 30 Gy using 'wedge shaped mid-line block') and two intracavitary insertions, first at 2nd week of external irradiation and second at the end. The total dose delivered through intracavitary remains 60 Gy and 68 Gy to Point A for stage Ib, Ila and Ilb respectively. The wedge shaped mid-line block was designed using the dose distribution for Fletcher - Suit applicator of typical configuration of 13 7cs pellets. This block was designed such that the fall of dose rate with an intracavitary application between point A and point B has been compensated by external irradiation. This paper presents the design of the wedge shaped mid-line block, dosimetric measurements and its advantages over conventional rectangular block.

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