A new phantom was designed and built in order to quantify the spatial distortions produced in images taken by MRI for treatment planning of brachytherapy for cervical cancer. It was found that for a field of view of 30 cm; large enough to incorporate the anatomy required to plan treatment, the distortions were of the order of millimetres or individual pixels. The images were compared to ones ta...

The deformable lung phantom was developed to account for the patient breathing motion, and to evaluate for a deformable image registration algorithm. The phantom consisted of an acryl cylinder filled with water and a latex balloon located in the inner space of the cylinder. A silicon membrane was attached to the inferior end of the phantom. This silicon membrane was designed to simulate a real ...

We are implementing the use of magnetic resonance (MR) images for head and neck radiotherapy planning, which involves their registration with computed tomography (CT). The quality assurance (QA) of the registration process was an initial step of this program. A phantom was built, and appropriate materials were identified to produce clinically relevant MR T1 and T2 contrast for its constituent "...

Background: Most of the current brachytherapy treatment planning systems (TPS) use the TG-43U1 recommendations for dosimetry in water phantom, not considering the heterogeneity effects.Objective: The purpose of this study is developing a method for obtaining correction factors for heterogeneity for Cs-137 brachytherapy sources based on pre-calculated MC simulations and interpolation.Method: To ...

Background: Accurate dose calcula ons in small beamlets and lung material have been a great challenge for most of treatment planning systems (TPS). In the current study, the dose calcula on accuracy of TiGRT TPS was evaluated for small beamlets in water and lung phantom by comparison to Monte Carlo (MC) calcula ons. Materials and Methods: The head of Siemens Oncorimpression linac was simulated ...

The main purpose of this article is a complex hyperthermia applicator system design for treatment of head and neck region. The applicator system is composed of four waveguides with a stripline horn aperture and circular water bolus. The specific absorption rate (SAR) and temperature distribution from this applicator in various numerical phantom models was investigated. For used targets, the tre...

The purpose of this work is to evaluate the volumetric-modulated arc therapy (VMAT) multicriteria optimization (MCO) algorithm clinically available in the RayStation treatment planning system (TPS) and its ability to reduce treatment planning time while providing high dosimetric plan quality. Nine patients with localized prostate cancer who were previously treated with 78 Gy in 39 fractions usi...