Verification of Absorbed Dose in Muscle Values Calculated by the Brachy Vision Software for the Treatment Planning of Carcinoma of Cervix using Iridium-192 Intracavitary Insertion Technique in Maharat Nakhon Ratchasima Hospital

Abstract

Objective: To verify the accuracy of the treatment planning for carcinoma of cervix using Iridium-192 intracavitary insertion technique in Division of therapeutic radiology and oncology, Maharat Nakhon Ratchasima Hospital. The treatment plans are computed by the Brachy Vision software using digital radiation images imported from the C-arm x-ray machine (OEC brand, 9800plus model) via digital imaging and communications in medicine. Materials and Methods: The absorbed dose in muscle values calculated by the treatment planning were compared with those values obtained from the measurement of NE 0.60 cc Robust ionization chamber type 2581 (polystyrene cap). Results: The error of the calculation of absorbed dose in muscle, without the correction of radiation attenuation factor of the applicators (Tandem and Ovoid factors), ranged from -1.4197% to 1.2304%, with the correction of Tandem and Ovoid factors, the error ranged from -2.9956% to -0.3042% and -2.2789% to 0.3937% respectively. Conclusion: The accuracy of the treatment planning for carcinoma of cervix using Iridium -192 intracavitary insertion technique in Maharat Nakhon Ratchasima hospital is acceptable within the tolerance error of ± 3%.