Commissioning and validation of the electron Monte Carlo dose calculation at extended source to surface distance from a medical linear accelerator
Journal Title: International Journal of Medical Research and Review - Year 2016, Vol 4, Issue 7
Abstract
Introduction: Radiotherapy is one of the major modality for cancer management playing curative, adjuvant, and palliative and sometimes has an alternative role to chemotherapy. Radiotherapy is practiced in two ways viz. External beam therapy and Brachytherapy. Electron beam therapy is widely used in the management of cancers. An electron beam is characterized by a finite range of penetration with a rapid dose fall off towards a slowly decaying x-ray background as the electrons traverse through tissues. The electron monte carlo (eMC) dose calculation algorithm for eclipse treatment system has been introduced by Varian Medical systems. The algorithm is commissioned and validated by comparing percentage depth dose (PDD) and gamma index. Methods: Percentage depth dose curves were generated for all the energies for 4x4 cm2 and 10x10 cm2 field sizes. The depth of maximum dose (R100), therapeutic depth (R85), depth of 50% isodose (R50) and the relative surface (Ds) were compared with the measured and calculated PDD curves. Results: The eMC calculated fluence and measured fluence were compared for all the energies and cones at nominal source to surface distance and extended distances. For 4x4 cm2 field size the maximum shift in R100 was 5 mm, R85 was 1.9 mm, R50 was 0.9 mm and the variation in the relative surface (DS) was about 25Gamma analysis shows excellent agreements with greater than 98% of the pixels passing the gamma requirements. Conclusion: We have successfully commissioned and validated the electron monte carlo dose calculation at extended source to surface distance.
Authors and Affiliations
T. Arunkumar, C. Varatharaj, M. Ravikumar, K. M. Ganesh, S. Sathiyan, Shwetha B
Keywords
Related Articles
- EP ID EP230630
- DOI 10.17511
- Views 134
- Downloads 0
A case report on Phenobarbitone induced Stevens-Johnson syndrome: an alarming hypersensitivity reaction
Stevens-Johnson syndrome (SJS) is an Ig E mediated hypersensitivity reaction, sometimes complicated by ocular manifestations. Antiepileptics induced SJS is common with Carbamazepine. Phenobarbitone is known to cause hype...
Association of subclinical hypothyroidism with atherosclerosis in central India
Introduction: Overt hypothyroidism is widely recognized as a risk factor for atherosclerosis and cardiovascular disease, but recently subclinical hypothyroidism has also shown as an independent risk for it. Subclinical h...
A prospective randomized study for comparison of onset time of intubation and intubating conditions using rocuronium with priming and without priming
Background: Rocuronium, a non-depolarizing neuromuscular blocking agent, with priming, can be used as an alternative to succinylcholine for rapid sequence intubation because it produces rapid onset of intubation with com...
Sinonasal Teratocarcinosarcoma
Sinonasal Teratocarcinosarcoma (SNTCS) is an extremely rare and unusual malignant neoplasm of the sinonasal tract with an aggressive behaviour. Till date, there are less than a hundred cases reported in literature. A 52...
A prospective, randomized, double blind controlled trial of the use of preoperative antibiotics in routine abdominal surgery: A comparative analysis between Ofloxacin + Metronidazole, Cefotaxime + Sulbactum and Cefepime +Tazobactum (Single does vs. Three doses) and their effects.
Introduction: Anti microbial prophylaxis before any elective surgery is a preferred deterrent to post operative surgical site infection now. We have used different antibiotics, two being from the cephalosporin class, one...