The International Tinnitus Journal

Efficacy and Evaluation Dose Distribution for Acoustic Neuroma Tumor by Using the Gamma Knife Radiosurgery.

Author(s): Rasha Tahseen Ibrahim*, Mohsen Hamoud Jasim, Tariq Nadhim Jassim, Nahd Jabbar Dalfi, Mohammed Fatta, Mohanad Ahmed Sahib

Background: Misdiagnosis of acoustic neuromas in clinical practice is common, and they share similarities with other brain tumors in terms of imaging symptoms and area of incidence. The most recent iteration of the gamma knife technique known as "lightning" was utilized in this investigation with the purpose of analyzing the plans of vestibular schwannomas by the most recent formula for assessing the tumor. Purpose: evaluation indices include selectivity, Gradient Index (GI), and Paddick Conformity Index (PCI). Methods: A cross-sectional study. Evaluation dose was determined for every desired TV volume of the sixty patients who had Stereotactic Radiosurgery (SRS) performed on them in order to treat vestibular schwannoma, Calculating this parameter required developing a theoretical concept for operational sphericity, which was done and following are some of the measurements that are used in the analysis of the values that were found: Coverage (C), Selectivity (S), Gradient Index (GI), Paddick Conformity Index (CI Paddick), and Dosage Distribution (IV/TV). Results: The patients included in this study, the patients' average age was 44.54 ± 11.93 years ranging from (20-75) years and the prevalence of females in this study is 35 (70%) more than the males 15 (30 %). The prescribed dose for vestibular schwannoma patients was 12 Gy. The mean target volume is 5.367 ± 0.058 cm3, ranging from (0.079-26.497) cm3. Conclusion: This study shows that divided the tumor into spheres, the first sphere delineates the regular part of the tumor, and the second sphere is delineated irregular cancer components, Since the plan of reference is a spherical target, the degree of sphericity is an excellent parameter to use when evaluating the dose dissemination of a strategy for the treatment of vestibular schwannoma. and utilizing a Leksell Gamma Knife® Icon (LGKI). According to the findings of this study, dividing the tumor into two halves provides valuable information regarding the distribution of the dose both within and outside the target volume.

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