BibTeX:

@article{IJIRSTV2I12032,
     title={Analysis of doses to trigeminal nerve, brainstem in Gamma Knife Radiosurgery---A Dosimetric Study},
     author={VINDHYAVASINI PRASAD PANDEY, SANJAY DIXIT, JAYANT MISRA, DEVI PRASAD PANDEY and VINOD K GANGWAR},
     journal={International Journal for Innovative Research in Science & Technology},
     volume={2},
     number={12},
     pages={88--93},
     year={},
     url={http://www.ijirst.org/articles/IJIRSTV2I12032.pdf},
     publisher={IJIRST (International Journal for Innovative Research in Science & Technology)},
}

Gamma Knife radiosurgery is a highly accurate and precise delivery system. Treatment of Trigeminal neuralgia (TN) is performed as a invasive frame fixation procedure in Gamma Knife radiosurgery. The prescription dose for TN is very high. Organ at risk (OAR) is brainstem which is adjacent to the target which has possibility to receive the very high target doses of TN. The present study is to analyse the dose distribution inside the tiny trigeminal nerve target and also to analyse the dose received in brainstem. Ten cases are considered in the present study to analyse the dose distribution in TN(Trigeminal Neuralgia) target and organ at risk. The treatment plan were analysed for target dose conformity, homogeneity and dose coverage. Gamma Plan version 8.3.1 is used for planning of cases.In the brainstem the volume doses Dmin, Dmax, Dmean were taken for analysing the doses in the brain stem. The mean value of maximum dose within the trigeminal nerve target was 91.04 ±1.6 and minimum dose was 12±5.05. The mean conformity index was 1.4±0.235 and the homogeneity index was 2.018±0.035. The mean dose to brainstem was 1.17±0.23 and the mean value of maximum dose to brainstem was 15.83±2.2. The present study shows the superior sparing of brainstem and reasonable of target coverage. Use of 4mm Collimator and plugging provides the best result to spare brainstem and deliver the desired dose to the Root Entry Zone in Trigeminal Neuralgia.

Trigeminal Nerve, Gamma Knife, Collimator