Essays about: "varian cancer"

Showing result 1 - 5 of 20 essays containing the words varian cancer.

1. 1. Evaluating aperture shape controller (ASC) in modulated radiation treatments

   University essay from

   Author : Vilma Andrén Cederholm; [2023-09-28]
   Keywords : Medical physics;

   Abstract : To decrease aperture complexity, the aperture shape controller (ASC) is a recently introduced function in Eclipse external beam planning (Varian Medical Systems, Palo Alto, USA). ASC works within the photon optimizer, minimizing distances between adjacent leaf tips of the MLC. READ MORE

3. 2. Uncertainties in the use of synthetic CT (sCT) for daily online adaptive radiotherapy for lung cancer

   University essay from Lunds universitet/Sjukhusfysikerutbildningen

   Author : Johansson Vivika; [2023]
   Keywords : Medicine and Health Sciences;

   Abstract : Background and purpose: Cone Beam Computed Tomography (CBCT) based online adaptive radiotherapy (oART) has been clinically implemented for several anatomical sites worldwide. However, random and abrupt anatomical changes with large density alterations can occur in lung patients, leading to uncertainties with synthetic computed tomography (sCT) and dose calculation. READ MORE

4. 3. Evaluation of the iterative kilovoltage cone-beam computed tomography reconstruction method for the Varian TrueBeam system

   University essay from

   Author : Tamana Haidari; [2022-03-18]
   Keywords : Medical physics; FDK algorithm; iterative algorithm; CBCT; image quality;

   Abstract : Introduction: Radiotherapy is used to treat patients with various types of cancer, where linear accelerators produce the radiation beam used for the treatment. Before each treatment fraction, the patient needs to be correctly positioned according to the treatment plan. READ MORE

5. 4. COMPARISON OF MULTI-CRITERIA OPTIMIZATION IN TWO DIFFERENT TREATMENT PLANNING SYSTEMS

   University essay from

   Author : Anna Lindström; [2021-05-10]
   Keywords : Medical physics; Multi-criteria optimization; Pareto front; volumetric modulated arc therapy; head and neck cancer; prostate cancer;

   Abstract : Purpose: The purpose with this study was to compare multi-criteria optimization (MCO) for volumetric modulated arc therapy (VMAT) treatment plans in two different treatment planning systems. Theory: When performing treatment planning prior to radiation therapy it is important to prioritize between absorbed dose to target and absorbed dose to organs at risk (OAR). READ MORE

6. 5. Quality assurance of a radiotherapy registry

   University essay from Umeå universitet/Institutionen för fysik

   Author : Linnea Sandberg; [2020]
   Keywords : Radiotherapy; Treatment Planning System; Quality Assurance; Information Network for Cancer Care; INCA;

   Abstract : The radiotherapy clinics in Sweden have been without a functioning national platform consisting of dose data from patients undergoing radiotherapy. A national collaboration between clinics will improve the quality of radiotherapy since clinics will be able to compare dose data from treatment plans between clinics. READ MORE