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Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists

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https://www.readbyqxmd.com/read/29950277/dosimetric-comparison-of-tomodirect-helical-tomotherapy-vmat-and-ff-imrt-for-upper-thoracic-esophageal-carcinoma
#1
Yaowen Zhang, Huitao Wang, Xiao Huang, Qiang Zhang, Runchuan Ren, Ronggang Sun, Zhiyong Zheng, Shangwen Dong, Anping Zheng
BACKGROUND: The new TomoDirect (TD) modality offers a nonrotational option with discrete beam angles. We aim to compare dosimetric parameters of TD, helical tomotherapy (HT), volumetric-modulated arc therapy (VMAT), and fixed-field intensity-modulated radiotherapy (ff-IMRT) for upper thoracic esophageal carcinoma (EC). METHODS: Twenty patients with cT2-4N0-1M0 upper thoracic esophageal squamous cell carcinoma (ESCC) were enrolled. Four plans were generated using the same dose objectives for each patient: TD, HT, VMAT with a single arc, and ff-IMRT with 5 fields (5F)...
June 24, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29801669/utilizing-skin-sparing-technique-in-hn-vmat-treatment-planning
#2
George Spencer Arnould, Martha Matuszak, Avraham Eisbruch
This study aims to demonstrate a specific treatment planning method and its effectiveness of sparing high dose to superficial skin for head and neck volumetric-modulated arc therapy (VMAT) treatments. A total of 10 patients with bilateral disease encompassing superficial neck nodes were planned as VMAT. Standard VMAT plans were created for each patient per written directive from physician, including target prescriptions, normal structure goals, and plan parameters. After these plans were created, low isodose levels were converted into dose structures, which are used to create a new skin sparing (SS) structure...
May 22, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29801668/a-vmat-planning-technique-for-locally-advanced-breast-cancer-patients-with-expander-or-implant-reconstructions-requiring-comprehensive-postmastectomy-radiation-therapy
#3
LiCheng Kuo, Åse M Ballangrud, Alice Y Ho, James G Mechalakos, Guang Li, Linda Hong
Locally advanced breast cancer patients with expander or implant reconstructions who require comprehensive postmastectomy radiotherapy (PMRT) can pose unique treatment planning challenges. Traditional 3D conformal radiation techniques often result in large dose inhomogeneity throughout the treatment volumes, inadequate target coverage, or excessive normal tissue doses. We have developed a volumetric modulated arc therapy (VMAT) planning technique without entering through the ipsilateral arm that produced adequate target volume coverage, excellent homogeneity throughout the target volume, and acceptable doses to the normal structures...
May 22, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29778321/submandibular-gland-sparing-when-irradiating-neck-level-ib-in-the-treatment-of-oral-squamous-cell-carcinoma
#4
William C Jackson, Peter G Hawkins, George S Arnould, John Yao, Charles Mayo, Michelle Mierzwa
Patients with oral squamous cell carcinoma (OSqCCA) frequently require postoperative radiation (PORT), which may include contralateral level IB within the clinical target volume (CTV). The submandibular gland (SMG) is typically included within the level IB CTV; however, the SMG does not contain lymph nodes or lymphatic vessels. We hypothesized that level IB could be adequately irradiated while sparing the SMG to reduce xerostomia. Twelve patients with OSqCCA receiving PORT, which included the contralateral level IB within the planning target volume (PTV), were retrospectively reviewed and replanned using volumetric modulated arc therapy...
May 16, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29778320/simultaneously-avoiding-the-hippocampus-and-hypothalamic-pituitary-axis-during-whole-brain-radiotherapy-a-planning-study
#5
Xing-Wen Fan, Juan-Qi Wang, Jun-Lan Wu, Hong-Bing Wang, Kai-Liang Wu
Whole brain radiotherapy (WBRT) is the preferred treatment for multiple brain metastases, and patients with limited-stage small cell lung cancer undergo prophylactic cranial irradiation after complete remission. However, neurotoxicity remains a complication. In addition to protecting the hippocampus from irradiation to preserve cognitive function, it is also critical to avoid irradiating the hypothalamic-pituitary axis to preserve endocrine and immune function. This study aimed to evaluate the feasibility of delivering WBRT while protecting the hippocampus and hypothalamic-pituitary axis...
May 16, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29776851/treatment-planning-dose-accuracy-improvement-in-the-presence-of-dental-implants
#6
Holly M Parenica, John R Ford, Panayiotis Mavroidis, Ying Li, Nikos Papanikolaou, Sotirios Stathakis
Streaking artifacts in computed tomography (CT) scans caused by metallic dental implants (MDIs) can lead to inaccuracies in dose calculations. This study quantifies and compares the effect of MDIs on dose distributions using the collapsed cone convolution superposition (CCCS) and Monte Carlo (MC) algorithms, with and without correcting for the density of the MDIs. Ion chamber measurements were taken to test the ability of the algorithms in Pinnacle3 and Monaco to calculate dose near high-Z materials. Nine previously treated patients with head and neck cancer were included in this study...
May 15, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29759487/clinical-examination-of-proton-pencil-beam-scanning-on-a-moving-anthropomorphic-lung-phantom
#7
Peng Wang, Shikui Tang, Paige A Taylor, David E Cummings, Martin Janson, Erik Traneus, Jared D Sturgeon, Andrew K Lee, Chang Chang
The objective of this study was to examine the use of proton pencil beam scanning for the treatment of moving lung tumors. A single-field uniform dose proton pencil beam scanning (PBS) plan was generated for the standard thorax phantom designed by the Imaging and Radiation Oncology Core (IROC) Houston QA Center. Robust optimization, including range and setup uncertainties as well as volumetric repainting, was used for the plan. Patient-specific quality assurance (QA) measurements were performed using both a water tank and a custom heterogeneous QA phantom...
May 11, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29752157/evaluation-of-a-novel-software-application-for-magnetic-resonance-distortion-correction-in-cranial-stereotactic-radiosurgery
#8
Juan-Francisco Calvo-Ortega, José Mateos, Ángel Alberich, Sandra Moragues, Juan-José Acebes, Sol San José, Joan Casals
This study aimed to validate a novel commercially available software for correcting spatial distortion in cranial magnetic resonance (MR) images. This software has been used to assess the dosimetric impact of MR distortion in stereotactic radiosurgery (SRS) treatments of vestibular schwannomas (VSs). Five MR datasets were intentionally distorted. Each distorted MR dataset was corrected using the Cranial Distortion software, obtaining a new corrected MR dataset (MRcorr). The accuracy of the correction was quantified by calculating the target registration error (TRE) for 6 anatomical landmarks identified in the co-registered MRcorr and planning computed tomography (pCT) images...
May 8, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29699800/dosimetric-effects-of-bolus-and-lens-shielding-in-treating-ocular-lymphomas-with-low-energy-electrons
#9
Lori Young, Landon S Wootton, Alan M Kalet, Olga Gopan, Fei Yang, Samuel Day, Michael Banitt, Jay J Liao
Radiation therapy is an effective treatment for primary orbital lymphomas. Lens shielding with electrons can reduce the risk of high-grade cataracts in patients undergoing treatment for superficial tumors. This work evaluates the dosimetric effects of a suspended eye shield, placement of bolus, and varying electron energies. Film (GafChromic EBT3) dosimetry and relative output factors were measured for 6, 8, and 10 MeV electron energies. A customized 5-cm diameter circle electron orbital cutout was constructed for a 6 × 6-cm applicator with a suspended lens shield (8-mm diameter Cerrobend cylinder, 2...
April 23, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29753335/external-beam-planning-module-of-eclipse-for-external-beam-radiation-therapy
#10
REVIEW
Cheng B Saw, SiCong Li, Frank Battin, Janice McKeague, Christopher A Peters
Eclipse is a 3-dimensional (3D) treatment planning system for radiation therapy offered by Varian Medical Systems, Inc. The system has the network connectivity for the electronic transfer of image datasets and digital data communication among different equipment. The scope of this project for this special issue of Medical Dosimetry on 3D treatment planning systems is the assessment of planning tools in the external beam planning module of Eclipse to generate optimized treatment plans for patients undergoing external beam radiation therapy...
July 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29753334/3d-treatment-planning-system-varian-eclipse-for-proton-therapy-planning
#11
REVIEW
Narayan Sahoo, Falk Poenisch, Xiaodong Zhang, Yupeng Li, MingFu Lii, Heng Li, Archana S Gautam, Richard Wu, Michael Gillin, Xiaorong R Zhu
The capabilities of the Eclipse treatment planning system (TPS) (Varian Medical Systems, Palo Alto, CA) for proton therapy treatment planning are described. Various steps involved in the planning process to produce a 3-dimensional (3D) dose distribution both for the passive scattering and pencil beam scanning proton beam therapy are outlined. Mitigation of range and setup uncertainties through robust optimization is discussed. Use of verification plans for patient treatment field dosimetry quality assurance (QA) is presented...
July 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29753333/3d-treatment-planning-systems
#12
REVIEW
Cheng B Saw, Sicong Li
Three-dimensional (3D) treatment planning systems have evolved and become crucial components of modern radiation therapy. The systems are computer-aided designing or planning softwares that speed up the treatment planning processes to arrive at the best dose plans for the patients undergoing radiation therapy. Furthermore, the systems provide new technology to solve problems that would not have been considered without the use of computers such as conformal radiation therapy (CRT), intensity-modulated radiation therapy (IMRT), and volumetric modulated arc therapy (VMAT)...
July 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29656889/3-d-treatment-planning-system-leksell-gamma-knife-treatment-planning-system
#13
REVIEW
Fanqing Guo
Leksell Gamma Plan (LGP), the treatment planning system for the Leksell Gamma Knife (LGK) stereotactic radiosurgery, has evolved from the primitive KULA system to the present-day powerful version of image-guided stereotactic radiosurgery. Through many years of development, LGP has improved on its dose calculation accuracy, speed, and user interface. This allows more accurate irradiation of the target while sparing the nearby normal tissues and critical structures better.
July 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29650302/raystation-external-beam-treatment-planning-system
#14
Dayna Bodensteiner
RaySearch Laboratories is a world leader in the field of advanced software and creator of the RayStation treatment planning system for radiation therapy. The aim with RayStation is to deliver an unmatched user experience and leading functionality. Unique features described here include multiatlas based autosegmentation for contouring, deformable registration with 2 different algorithms, multicriteria optimization, Plan Explorer, fallback planning, ultrafast computation speed, and 4-dimensional (4D) adaptive radiation therapy...
July 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29609845/evolution-of-brachytherapy-treatment-planning-to-deterministic-radiation-transport-for-calculation-of-cardiac-dose
#15
REVIEW
Peter A Sandwall, Yuntao Feng, Michael Platt, Michael Lamba, Sudha Mahalingam
Brachytherapy was among the first methods of radiotherapy and has steadily continued to evolve. Here we present a brief review of the progression of dose calculation methods in brachytherapy to the current state-of-the art computerized methods for heterogeneity correction. We further review the origin and development of the BrachyVision (Varian Medical Systems, Inc., Palo Alto, CA) treatment planning system and evaluate dosimetric results from 12 patients implanted with the strut-assisted volumetric implant (SAVI) applicator (Cianna Medical, Aliso Viejo, CA) for accelerated partial breast irradiation (APBI)...
July 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29605528/cyberknife-stereotactic-radiosurgery-and-radiation-therapy-treatment-planning-system
#16
REVIEW
Chuxiong Ding, Cheng B Saw, Robert D Timmerman
CyberKnife is an image-guided stereotactical dose delivery system designed for both focal irradiation and radiation therapy (SRT). Focal irradiation refers the use of many small beams to deliver highly focus dose to a small target region in a few fractions. The system consists of a 6-MV linac mounted to a robotic arm, coupled with a digital x-ray imaging system. The radiation dose is delivered using many beams oriented at a number of defined or nodal positions around the patients. The CyberKnife can be used for both intracranial and extracranial treaments unlike the Gamma Knife which is limited to intracranial cases...
July 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29598924/oncentra-brachytherapy-planning-system
#17
REVIEW
Jack Yang
In modern cancer management, treatment planning has progressed as a contemporary tool with all the advances in computing power in recent years. One of the advanced planning tools uses 3-dimensional (3D) data sets for accurate dose distributions in patient prescription. Among these planning processes, brachytherapy has been a very important part of a successful cancer management program, offering clinical benefits with specific or combined treatments with external beam therapy. In this chapter, we mainly discussed the Elekta Oncentra planning system, which is the main treatment planning tool for high-dose rate (HDR) modality in our facility and in many other facilities in the United States...
July 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29580934/3d-treatment-planning-on-helical-tomotherapy-delivery-system
#18
REVIEW
Cheng B Saw, Leah Katz, Carol Gillette, Lawrence Koutcher
The helical tomotherapy is a technologically advanced radiation dose delivery system designed to perform intensity-modulated radiation therapy (IMRT). It is mechanistically unique, based on a small 6-MV linear accelerator mounted on a ring gantry that rotates around the patient while the patient moves through a bore, ultimately yielding a helical path of radiation dose delivery. The helical pattern of dose delivery differentiated tomotherapy from other contemporary radiation therapy systems at the time of its inception...
July 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29580933/3d-treatment-planning-system-pinnacle-system
#19
REVIEW
Ping Xia, Eric Murray
The treatment planning system is key for the success of external beam radiotherapy, directly impacting the quality of treatment plans and accuracy of dose calculation in the plans. In this article, we provided an overview of the Pinnacle treatment planning system for external beam planning, including 3-dimensional (3D) conformal plans, step-shoot intensity modulated radiotherapy (IMRT) plans, and volumetric modulated arc therapy (VMAT) plans. We discussed dose calculation algorithm and other utilities, including image fusion, plan documentation, and adaptive planning...
July 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29573922/monaco-treatment-planning-system-tools-and-optimization-processes
#20
REVIEW
Mac Clements, Nicholas Schupp, Megan Tattersall, Anthony Brown, Randy Larson
The Monaco treatment planning system combines Monte Carlo dose calculation accuracy with robust optimization tools to provide high-quality radiotherapy treatment plans for three-dimensional conformal radiotherapy (3D CRT), intensity modulated radiotherapy (IMRT), volumetric modulated arc therapy (VMAT), stereotactic radiosurgery (SRS), and stereotactic body radiotherapy (SBRT). Recent technology advances have allowed for fast calculation speeds, which allow clinicians and patients to benefit from the accuracy of the Monte Carlo algorithm while reducing overall planning time...
July 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
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