Abstract Objective. Four-dimensional computed tomography (4DCT) imaging consists in reconstructing a CT acquisition into multiple phases to track internal organ and tumor motion. It is commonly used radiotherapy treatment planning establish target volumes. However, 4DCT increases protocol complexity, may not align with patient breathing during treatment, lead higher radiation delivery. Approach. In this study, we propose deep synthesis method generate pseudo respiratory from static images...

Purpose: In premise of uninfluenced to dose distribution tumor target and organ at risk(OAR) in cervical cancer,area segment fields was changed increase efficacy optimize treatment method by designing different plan intensity modulated radiotherapy(IMRT). Methods: 12 cases cancer were confirmed pathology treated with step shoot IMRT. Dose PTV 50Gy/25fractions. Every patient designed 9 plans IMRT Pinnacle 8.0m planning system,each used beams uniform fixing incidence...

Purpose: Image-guided radiation therapy (IGRT) is one of the major treatment esophageal cancer. Gray value registration and bone are two kinds image registration, purpose this work to compare which more suitable for cancer patients. Methods: Twenty three patients were treated by Elekta Synergy, CBCT images acquired automatically registered planning kilovoltage CT scans according gray or registration. The setup errors measured in X, Y Z axis, respectively. Two analysed matching T test...

Purpose: To compare the performances of four commercial treatment planning systems (TPS) used for intensity-modulated radiotherapy (IMRT). Methods: Ten patients nasopharyngeal (4 cases), esophageal (3 cases) and cervical cancer were randomly selected from a 3-month IMRT plan pool at one center. For each patient, plans newly generated by using TPS (Corvus, Monaco, Pinnacle Xio), then verified with Matrixx (two-dimensional array/IBA Company) on Varian23EX accelerator. A pass rate (PR)...

Purpose: To compare plan quality of volumetric modulated arc radiotherapy (VMAT) using different gantry rotation times. Methods: In ten rectal carcinoma patients, plans with times were designed by Oncentra4.3 planning system, each them was optimized experienced planners almost similar parameters and dose constraints except the time. The time increased from 30s to 150s step 30(30s, 60s, 90s, 120s, 150s). Plans (VMAT30s, VMAT60s, VMAT90s, VMAT120s VMAT150s) normalized so that at least 95% PTV...

Purpose: Different treatment planning systems (TPS) use different optimization and leaf sequencing algorithms. This work compares cervical carcinoma IMRT plans optimized with four commercial TPSs to investigate the plan quality in terms of target conformity delivery efficiency. Methods: Five cases were planned Corvus, Monaco, Pinnacle Xio by experienced planners using appropriate parameters dose constraints meet clinical acceptance criteria. Plans normalized for at least 95% PTV receive...

Purpose: The goal of this study was to compare the accuracy dose calculations relative Monte Carlo within a low-density region five common IMRT TPSs. Methods: Ten lung cancer cases were optimized with different Of TPSs we tested, Three use CSA/AAAs(Xio4.0, Pinnacle8.0m and Eclipse7.5.18.0) two PBAs(Corvus08, calculation algorithms. All plans designed for delivery on Varian 23EX accelerator using 6MV photon beam. recalculated by leaf sequences MUs individual plans. Dose algorithms evaluated...

Purpose: Different treatment planning systems (TPS) use different optimization and leaf sequencing algorithms. This work compares nasopharyngeal carcinoma (NPC) IMRT plans optimized with four commercial TPSs to investigate the plan quality in terms of target conformity delivery efficiency. Methods: Five cases were planned Corvus, Monaco, Pinnacle Xio by experienced planners using appropriate parameters dose constraints meet clinical acceptance criteria. Plans normalized for at least 95% PTV...

Purpose: To measure the setup errors with infrared marker‐based positioning system (IM‐BPS) and electronic portal imaging device （EPID） for patients esophageal carcinoma lung cancer investigate accuracy practicality of IM‐BPS. Methods: From January 2007 to 2008, 40 27 received three‐dimensional conformal radiotherapy or intensity‐modulated radiotherapy, during treatment were measured IM‐BPS EPID, data compared paired t‐test agreement χ2‐ test. Results:...

Purpose: Measuring the setup errors and organ movements of patients with esophagus carcinoma during radiotherapy, finding a reasonable margin from Clinic Target Volume (CTV) to Planning (PTV). Methods methods: 1. Set-up verification: Forty-two cases untreated esophageal cancer were enrolled into this study. The Physicist firstly made planning according doctor requests ensure best distribution at target. Thereafter, 0o 90o Digital Reconstructed Radiograph(DRR)were transmitted iView GT...

Purpose: Complex dose delivery techniques like intensity-modulated radiation therapy (IMRT) require verification in three dimensions. This work investigates the accuracy of distribution esophageal IMRT plans using three-dimensional measurement and Monte Carlo simulation. Method Materials: Ten cases delivered by Varian 23EX were planned with Pinnacle 8.0. The recalculated phantom Delta4 structures every patients accurate parameters. also leaf sequences MUs for individual plans. All measured...

Purpose: This work employs the Monte Carlo method to recompute IMRT dose distributions from four TPS provide a platform for independent comparison and evaluation of plan quality in terms target conformity. Method Materials: Eleven prostate cases were planned with Corvus, Xio, Pinnacle Eclipse using appropriate optimization parameters constraints. The plans recalculated by leaf sequences MUs individual plans. Dose-volume-histograms isodose compared. Other quantities such as Dmin (the minimum...