ABSTRACT
<p><b>OBJECTIVE</b>To reduce the influence of breathing movement on the location precision of the tumor target in precise radiotherapy for thoraco-abdominal tumors.</p><p><b>METHODS</b>An inverse tracking system was developed to track the path of the breathing movement of the tumor target via image guiding. With this system, the displacement of the target in a given time period was tracked and quickly transformed in signals that drove the tracking couch to move inversely relative to the tumor target.</p><p><b>CONCLUSION</b>This system can effectively reduce the influence of tumor target breath movement during radiotherapy. Compared with other breath movement control methods, this method avoids prolonged exposure time, allows the patient to breathe at ease and shortens the time of CT scanning.</p>
Subject(s)
Female , Humans , Male , Lung Neoplasms , Radiotherapy , Movement , Radiotherapy Dosage , Radiotherapy Planning, Computer-Assisted , Radiotherapy, Conformal , Methods , RespirationABSTRACT
This paper presents a novel x-ray dose testing water tank used for the stereotactic radiation therapy system, including its constitution, structure and the method of using it. The water tank has a simple structure of inner and outer sleeves which are connected through a drowned pump and a water pipe in order to control the water level of the tank. The water tank featuring autoregulation and easy use is worthy of clinical application and popularization.
Subject(s)
Equipment Design , Radiosurgery , Methods , Radiotherapy Dosage , Radiotherapy Planning, Computer-Assisted , MethodsABSTRACT
As a powerful global optimization approach, genetic algorithms (GA) can solve a variety of optimization problems in which the objective function is discontinuous, non-differentiable, or highly non-linear, to produce high convergence speed and vast search space. In this thesis, GA is used to optimize the beam weights of intensity modulated radiation therapy (IMRT) inverse planning, and 2D and 3D isodose contour as well as dose volume histogram (DVH) are used to evaluate the treatment plan. Also presented in this thesis are the results of calculation with discussions.
Subject(s)
Humans , Algorithms , Models, Theoretical , Radiotherapy Dosage , Radiotherapy Planning, Computer-Assisted , Methods , Radiotherapy, Conformal , Methods , Reference StandardsABSTRACT
<p><b>UNLABELLED</b>To study the method for dose calculation and beam weight optimization of intensity-modulated radiation therapy (IMRT).</p><p><b>METHODS</b>The IMRT dose calculation model based on two-dimensional convolution was constructed, the program of dose calculation and beam weight optimization with genetic algorithm was written with Visual c#.Net, and the optimization results were analyzed.</p><p><b>RESULTS</b>Genetic algorithm optimization of beam weights can produce highly conformal dose distributions within a clinically acceptable computation time.</p><p><b>CONCLUSION</b>Genetic algorithm is valid and efficient in IMRT beam weight optimization, which may facilitate IMRT treatment planning.</p>
Subject(s)
Humans , Algorithms , Models, Statistical , Models, Theoretical , Radiotherapy Dosage , Radiotherapy Planning, Computer-Assisted , Methods , Radiotherapy, Conformal , Methods , Reference StandardsABSTRACT
This paper introduces the constitution and fabrication of the new head and neck stereotactic conformal radiotherapy system. It remedies the shortages in the head and neck stereotactic conformal radiotherapy at present and it is deserved to be popularized in clinical applications.