Quality assurance of modern image guided 3D-conformal radiotherapy treatments
Journal Title: Journal of Medical and Scientific Research - Year 2014, Vol 2, Issue 2
Abstract
Purpose: To describe the Quality Assurance (QA) methods of modern Three-dimensional conformal radiotherapy (3DCRT) treatments such as image guided Intensity-modulated radiation therapy (IMRT), RapidArc, Stereotactic radiosurgery (SRS)/ Stereotactic fractionated radiation (SRT) to ensure quality of treatments delivered to cancer patients. Materials and methods: 3D-RFA and Ionisation chambers were used for the machine specific QA. Imatrixx-2D array with locally fabricated phantom and another locally fabricated spherical phantom with ionization chambers is used for relative and absolute QA respectively. Electronic Portal Imaging Devices and Epiqa software is used for the QA with portal dosimetry. Varians Eclipse and Brainlab’s Iplan treatment planning systems were used for treatment plans and dose calculations. For relative dosimetry the planar dose matrices are analysed using global Gamma Index criteria of 3mm distance to agreement (DTA) and 3% dose difference. The QA of Machines and patient treatments were carried out using national and international protocols. Results: The maximum deviations of percentage of dose points in which γ>1 are 1.98 in relative dosimetric QA and 1.5 for absolute QA in the delivery of IMRT, RapidArc and SRS/SRT treatments. The mean deviations and Standard deviation (SD) values are less in portal dosimetry than that of phantom studies in relative dosimetry and all the absolute dose deviations are less than that of relative dose deviations. Conclusion: The results of machine specific QA as well as relative and absolute dosimetric QA of patient treatments are well within the acceptable limits of values mentioned in the national and international protocols. The study ensures the accuracy and quality of the treatments delivered to the patients at our oncology center.
Authors and Affiliations
Krishnamurthy K, Babu AA, Prasad PBLD, Arasu KK
Keywords
Related Articles
- EP ID EP608679
- DOI 10.17727/JMSR.2014/2-011
- Views 65
- Downloads 0
Broncho-esophageal fistula: Successful surgical repair after failed esophageal stent
Introduction: Acquired broncho-esophageal fistulas are uncommon and typically malignant in origin. Because of their location, they are difficult to treat and involve complicated repairs with equivocal results. Prior tre...
Ectodermal dysplasia and partial anodontia: A case report
Ectodermal dysplasia is a hereditary disorder that occurs as a consequence of disturbances in the ectoderm of the developing embryo. It is usually accompanied by lack of sweat glands and a partial or complete absence of...
Minimally invasive cardiac surgery in a patient with Klippel-Feil syndrome: A case report
Klippel–Feil syndrome is a rare congenital disorder characterized by short neck, restricted neck movements and low posterior hair line. We present a case of Klippel- Feil syndrome in a 9-year-old girl, who also had left...
Sphincter exercises for people with urinary incontinence
Abstract is not available for this article
Postoperative ileus
Abstract is not available for this article