Abstract:

Purpose: Since early stages of larynx cancer are considered to be treated, we have studied whether there is a difference between advanced technology-contributed treatments used to ensure a long-term quality of life and to prevent the development of secondary malignities to the maximum. Early stages of glottic localized larynx cancer with the help of the Eclipse planning system in the computer environment are aimed at comparing the physical plans that will be made in accordance with the 3D radiotherapy (3BKRT), intensity adjusted (IMRT) and volumetric arc (VMAT) radiotherapy techniques with the risk-based organs doses, conformity indices (KI) and the monitor units the patient receives in total. Methods: Early stage (T1N0M0) of glottic larynx cancer was diagnosed and in the treatment only radiotherapy was administered in patients, radiotherapy planning tomography cuts were registered in the system. These cuts were used to identify the target volume and critical organs. After these procedures, each patient was made plans according to the 3BKRT, VMAT, IMRT 5 and 7 field techniques, and these plans were compared. Patients have no electrified nodal radiation. A total of 63 Gy doses were prescribed to PTV in 28 fractions for all patients. Results: There is no difference between VMAT and IMRT (5 and 7 fields) techniques for the average dose of PTV. In terms of the heterogenity index and AI, the best results were obtained with the IMRT 7 field techniques for the average dose of carothyde arteries and V35 values. In 3BKRT, although very low doses for medulla spinalis were detected, the dosage amounts obtained from the other three plans are also acceptable. In early stages of treatment of glottic larynx cancer with RT, treatment with VMAT or IMRT was found suitable due to higher conformity and better protection of critical organs instead of 3BKRT. The selection of 7 fields as the IMRT technique will be positive, especially in terms of carotid arteries.

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