Evaluate the doses to the Organs At Risk (OAR) calculated by using oncentra treatment planning system for cervical cancer
Objective: The aim of this work was to determine doses to rectum and bladder for dose behaviors in the treatment of cervical cancer by high dose rate (HDR) intracavitary brachytherapy (ICRT) using Ocentra treatment planning system. Materials and methods: A retrospective study was carried out on 1...
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| Main Author: | |
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| Format: | Monograph |
| Language: | English |
| Published: |
Pusat Pengajian Sains Kesihatan, Universiti Sains Malaysia
2015
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| Subjects: | |
| Online Access: | http://eprints.usm.my/58000/1/NORAZRIEN%20SUHAILA%20BINTI%20NOR%20AZMI-24%20pages.pdf http://eprints.usm.my/58000/ |
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| Summary: | Objective: The aim of this work was to determine doses to rectum and bladder for dose
behaviors in the treatment of cervical cancer by high dose rate (HDR) intracavitary
brachytherapy (ICRT) using Ocentra treatment planning system.
Materials and methods: A retrospective study was carried out on 1 0 patients with a total
of 20 fractions (1 51 and 251 fractions for each patient) of cervical cancer treated with
HDR intracavitary brachytherapy in addition to external radiotherapy (EBRT).
Brachytherapy treatment planning was performed using Ocentra Treatment Planning
System (Nucletron). Before this, the treatment was done using Plato treatment planning.
Fletcher-suit applicators (Nucletron) with different size of ovoid which are mini (1.5
mm), small (2.0mm) and medium (2.5mm) are used for ICBT. The prescribed doses 900
cGy (9 Gy) for each fraction is normalised at applicator point. Normal distributions
were tested for the rectum and bladder doses for any statistical conclusions.
Results: It was observed that rICUR and bICRU were found to show normal distribution
for fraction one with mean dose of 38% and 46% and standard deviation of 16% and
17%, respectively. Then rICUR and bICRU for fraction two with mean dose of 35%
and 41% and standard deviation of 13% and 1 0 % respectively.
Conclusions: The normality behavior of the rectal and bladder point dose show that less
than 60% and 80 % of the prescribed dose at point A which means is in the limit of
International Commission on Radiation Units (ICRU). |
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