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Abstract
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Abstract
BACKGROUND: In cervical cancer radiotherapy, it
was aimed to compare the intensity of the dose given
to the tumor volume, the maximum amount of
protection of critical organs and healthy tissues, the
duration of treatment in monitor unit (MU) the
homogeneity and conformity indices using seven
field intensity modulated radiotherapy (IMRT) and
dual arc-volumetric modulated arc therapy (DAVMAT) techniques.
METHODS: Fifteen patients with cervical cancer
diagnosed and treated curatively, who are in stage
IIB according to FIGO staging, were planned with
IMRT and VMAT techniques as 50 Gy/25 fractions,
and a dosimetric comparison was made in terms of
target volume and organs at risk.
RESULTS: In terms of critical organs while the
average value of the volume percentage that
received 40 Gy dose for the bladder was 57.5 % in
the plans made with the IMRT technique, it was
found to be 50.1% in the plans made with the VMAT
technique (p<0.07). Although statistical significance
could not be reached, it was observed that the
protection of the VMAT technique for the intestine was relatively higher than the IMRT technique. A
statistically significant difference was found in the MU
produced per fraction, and the MU value of the
VMAT technique was lower than the IMRT technique
(p<0.001).
CONCLUSION: DA-VMAT treatment technique for
cervical cancer radiotherapy at low and high doses,
has intestinal protection with low MU value in VMAT
technique is seen as an advantage in terms of
patient comfort and device performance.