Browsing by Author "Kant, Ravi"

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    Dosimetric evaluation in carcinoma lung by intraluminal brachytherapy and correlation in phantom model
    (SRHU, 2024-10-01) Kant, Ravi
    In the carcinoma lung patient, endobronchial brachytherapy (EBBT) is used as treatment modality. The radiation dose to the tumor is planned in the treatment planning system (TPS) on the CT scan of the patient and treatment delivered by the machine. Treatment plan verification, dosimetric, volumetric analysis is necessary to perform for accurate treatment delivery to the patient, which requires a tissue equivalent phantom model mimicking the actual thoracic body structure because in the actual patient, dosimetry is not possible. In this study, the dosimetric analysis is performed in the locally fabricated human tissue equivalent thorax phantom with the help of Radiochromic film dosimeters. Dosimetric and volumetric analysis is performed on patients treated with EBBT technique.
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    Experimental dosimetry in locally fabricated phantom for endobronchial brachytherapy plan: A phantom study
    (Wolters Kluwer, 2026) Kant, Ravi; Uniyal, Satish Chandra et al.
    Background: This study is to perform dosimetric analysis in a locally fabricated thorax phantom with the help of radiochromic film. Materials and Methods: A thorax human body tissue equivalent phantom was fabricated. This phantom was scanned in the positron emission tomography/computed tomography (PETCT) machine and transferred the CT data into the Oncentra Master Plan treatment planning system (TPS). A brachytherapy (BT) plan created in TPS, exported to the high dose rate (HDR) BT machine. Placed Radiochromic EBT3 film dosimeter at the desired locations in the phantom and irradiate on machine with Ir‑192 source. The TPS calculated values were compared with film measured values in the Phantom. Doses at five points in each film for each organ at risk were measured and compared with the TPS calculated doses to see the effects of distance on dose variation for analysis purpose. Results: The film measured doses deviate from TPS calculated doses with –2.5%, –3.2%, 3.8%, 2.4%, 5.3%, 17.75%, –7.1%, –9.4%, and 7.1% variation to Heart, Esophagus, Spinal Cord, descending Aorta, Ipsilateral Lung, Ipsilateral Lung 2 cm depth, pulmonary trunk, coronary artery, and contralateral Lung doses, respectively. In each film out of five points the center point and point closure to the source was having less variation between TPS calculated and film measured doses then other points. Conclusion: This variation is due to the algorithm used in BT TPS so it is important to perform a verification of the treatment plan before execution in the patient to assure accuracy of treatment delivery. It is cheaper and used as a quality assurance Tool.