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Evaluation of Dose Calculations and Couch Positional Accuracy in the Context of Dynamic Couch Trajectories

2014
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Release : 2014
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Book Synopsis Evaluation of Dose Calculations and Couch Positional Accuracy in the Context of Dynamic Couch Trajectories by : Joel Mullins

Download or read book Evaluation of Dose Calculations and Couch Positional Accuracy in the Context of Dynamic Couch Trajectories written by Joel Mullins. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: "The Varian TrueBeam STx linear accelerator features a developer's mode in which treatment plans can be programmed that include patient couch motion during radiation delivery. The combination of synchronous couch/gantry trajectories with Varian volumetric modulated arc therapy (VMAT) optimizations, called RapidArc, can result in a treatment technique that has been designated Virtual Isocenter RapidArc (VIRA). Prior to its implementation, the accuracy of dose calculations in the Varian Eclipse treatment planning system, on which the RapidArc optimization depends, must be validated, as well as the positional accuracy of the TrueBeam patient couch. The dose calculation accuracy was evaluated extrinsically through the delivery of clinical dynamic multileaf collimator (DMLC) intensity modulated radiotherapy (IMRT) treatment plans as a function of source-to-surface distance (SSD) and measurement with ionization chamber and Gafchromic EBT3 film. Parameters intrinsic to dose calculations in Eclipse, the dosimetric leaf gap (DLG) and leaf transmission (LT), were also investigated for their dependence on SSD. The positional accuracy of the treatment couch was assessed through the generation of treatment plans with static couch/gantry, static couch/rotating gantry, and synchronous couch and gantry motion, with measurement of the real-time ionization chamber current positioned in a cylindrical phantom during radiation delivery. The relative agreement of ionization chamber measurements to Eclipse dose calculations for DMLC IMRT treatment plans decreased by 1.5±0.3% over SSDs in the range of 85 cm to 135 cm (less than 1.0% deviation from standard clinical reference conditions of 100 cm SSD). Gafchromic EBT3 film measurements were consistent with ionization chamber results, though noise in the film data at low doses resulted in large uncertainties. Measurements of DLG were independent of SSD, following corrections for geometric projection. LT showed a dependence on SSD of 0.09±0.02% over the SSD range investigated. The ionization chamber current measurements for synchronous couch and gantry rotation, analogous to the proposed VIRA technique, indicated a maximum deviation of 0.2 cm relative to treatment isocenter, equal to the deviation observed for the rotating gantry/static couch treatment, analogous to conventional VMAT delivery. These results indicate that the Varian TrueBeam and Eclipse maintain the necessary positional and dosimetric accuracy required for VMAT treatments involving dynamic couch trajectories." --

Handbook of Robotic and Image-Guided Surgery

2019-09-25 Science
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Release : 2019-09-25
Genre : Science
Kind : eBook
Book Rating : 464/5 ( reviews)

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Book Synopsis Handbook of Robotic and Image-Guided Surgery by : Mohammad Abedin-Nasab

Download or read book Handbook of Robotic and Image-Guided Surgery written by Mohammad Abedin-Nasab. This book was released on 2019-09-25. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Robotic and Image-Guided Surgery provides state-of-the-art systems and methods for robotic and computer-assisted surgeries. In this masterpiece, contributions of 169 researchers from 19 countries have been gathered to provide 38 chapters. This handbook is 744 pages, includes 659 figures and 61 videos. It also provides basic medical knowledge for engineers and basic engineering principles for surgeons. A key strength of this text is the fusion of engineering, radiology, and surgical principles into one book. A thorough and in-depth handbook on surgical robotics and image-guided surgery which includes both fundamentals and advances in the field A comprehensive reference on robot-assisted laparoscopic, orthopedic, and head-and-neck surgeries Chapters are contributed by worldwide experts from both engineering and surgical backgrounds

Adaptive Radiation Therapy

2011-01-27 Medical
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Release : 2011-01-27
Genre : Medical
Kind : eBook
Book Rating : 352/5 ( reviews)

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Book Synopsis Adaptive Radiation Therapy by : X. Allen Li

Download or read book Adaptive Radiation Therapy written by X. Allen Li. This book was released on 2011-01-27. Available in PDF, EPUB and Kindle. Book excerpt: Modern medical imaging and radiation therapy technologies are so complex and computer driven that it is difficult for physicians and technologists to know exactly what is happening at the point-of-care. Medical physicists responsible for filling this gap in knowledge must stay abreast of the latest advances at the intersection of medical imaging an

Stereotactic Body Radiation Therapy

2012-08-28 Medical
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Release : 2012-08-28
Genre : Medical
Kind : eBook
Book Rating : 04X/5 ( reviews)

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Book Synopsis Stereotactic Body Radiation Therapy by : Simon S. Lo

Download or read book Stereotactic Body Radiation Therapy written by Simon S. Lo. This book was released on 2012-08-28. Available in PDF, EPUB and Kindle. Book excerpt: Stereotactic body radiation therapy (SBRT) has emerged as an important innovative treatment for various primary and metastatic cancers. This book provides a comprehensive and up-to-date account of the physical/technological, biological, and clinical aspects of SBRT. It will serve as a detailed resource for this rapidly developing treatment modality. The organ sites covered include lung, liver, spine, pancreas, prostate, adrenal, head and neck, and female reproductive tract. Retrospective studies and prospective clinical trials on SBRT for various organ sites from around the world are examined, and toxicities and normal tissue constraints are discussed. This book features unique insights from world-renowned experts in SBRT from North America, Asia, and Europe. It will be necessary reading for radiation oncologists, radiation oncology residents and fellows, medical physicists, medical physics residents, medical oncologists, surgical oncologists, and cancer scientists.

Proton Therapy Physics

2016-04-19 Medical
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Release : 2016-04-19
Genre : Medical
Kind : eBook
Book Rating : 450/5 ( reviews)

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Book Synopsis Proton Therapy Physics by : Harald Paganetti

Download or read book Proton Therapy Physics written by Harald Paganetti. This book was released on 2016-04-19. Available in PDF, EPUB and Kindle. Book excerpt: Proton Therapy Physics goes beyond current books on proton therapy to provide an in-depth overview of the physics aspects of this radiation therapy modality, eliminating the need to dig through information scattered in the medical physics literature. After tracing the history of proton therapy, the book summarizes the atomic and nuclear physics background necessary for understanding proton interactions with tissue. It describes the physics of proton accelerators, the parameters of clinical proton beams, and the mechanisms to generate a conformal dose distribution in a patient. The text then covers detector systems and measuring techniques for reference dosimetry, outlines basic quality assurance and commissioning guidelines, and gives examples of Monte Carlo simulations in proton therapy. The book moves on to discussions of treatment planning for single- and multiple-field uniform doses, dose calculation concepts and algorithms, and precision and uncertainties for nonmoving and moving targets. It also examines computerized treatment plan optimization, methods for in vivo dose or beam range verification, the safety of patients and operating personnel, and the biological implications of using protons from a physics perspective. The final chapter illustrates the use of risk models for common tissue complications in treatment optimization. Along with exploring quality assurance issues and biological considerations, this practical guide collects the latest clinical studies on the use of protons in treatment planning and radiation monitoring. Suitable for both newcomers in medical physics and more seasoned specialists in radiation oncology, the book helps readers understand the uncertainties and limitations of precisely shaped dose distribution.

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