Quality assurance of simultaneous treatment of two targets in pelvic region planned with single isocenter using three dimensional conformal radiotherapy (3DCRT) technique

International Journal of Cancer Therapy and Oncology

Vadhiraja Bejadi Manjunath¹  Sridhar Chinthamani²  Arun Kumar Elavunkal Sukumaran³  Prakash Saxena³  Challapalli Srinivas³  Sourjya Banerjee³  Suman Kumar Putha³  Dinesh Pai Kasturi³ 

[1] Department Radiation Oncology, Manipal Hospital, Bangalore;Department of Radiation Oncology, Father Muller Oncology Center, Mangalore;Department of Radiotherapy & Oncology, Kasturba Medical College Hospital, Mangalore;

关键词: Quality Assurance;    Two Targets;    Single Isocenter;    Conformal Radiotherapy;   

DOI  :  10.14319/ijcto.33.15

来源: DOAJ

【 摘 要 】

Purpose: The purpose of this study was to conduct quality assurance of a three dimensional conformal radiotherapy (3DCRT) of two targets in pelvis region planned with single isocenter technique.

Methods: A treatment plan was generated with two identical water phantoms with ionization chamber (IC) sleeves (IC-1 & IC-2), simulated as if targets are in pelvis region, simultaneously irradiated with single isocenter technique with a dose prescription of 300 cGy for point dose verification. A two dimensional ion chamber array detector was used for fluence verification.

Results: Calculated minimum, mean and maximum dose (in cGy) for IC-1 & IC-2 were 295, 303 and 307 as per dose volume histogram. The global dose maximum was found to be 307.4 cGy. Measured point doses to both lesions were within ±2.5% of the computed dose. A pass percentage of 97% was obtained with the set of criteria 3 mm distance to agreement and 3% dose difference for fluence verification.

Conclusion: Treatment execution of two targets simultaneously with single isocenter can reduce positional errors and delivery time.

【 授权许可】

Unknown