Both TomoTherapy
and RapidArc have been examined in hippocampus sparing whole brain irradiation
in adults. We aim to compare both techniques
in pediatrics with relatively smaller brain volume.
Patients and
Methods: The hippocampus, the whole brain and the eyes were manually contoured
in 3 pediatric patients. TomoTherapy plan was created aiming at adequate brain
coverage and as low as possible hippocampus dose, RapidArc was challenged to
achieve similar or better plan results.
The prescription
dose was 36 Gy in 20 treatment fractions to the whole brain. Results:
TomoTherapy was able to achieve a mean hippocampus dose of 13.6 Gy with brain
homogeneity index [HI] of 0.14 Using RapidArc [single arc], the same
hippocampus dose was not achievable without compromising the brain HI
significantly.
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