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radiation knowledge based planning

Chang Heon Choi, So-Yeon Park, Jung-In Kim, Jin Ho Kim, Kyubo Kim, Joel Carlson, Jong Min Park
OBJECTIVES: To investigate the plan quality of tri-Co-60 intensity-modulated radiation therapy (IMRT) plans for spine stereotactic ablative radiotherapy (SABR). METHODS: A total of 20 patients with spine metastasis were retrospectively selected. For each patient, a tri-Co-60 IMRT plan and a volumetric modulated arc therapy (VMAT) plan were generated. The spinal cords were defined based on magnetic resonance images for the tri-Co-60 IMRT, while isotropic 1 mm margins were added to the spinal cords for the VMAT plans...
October 26, 2016: British Journal of Radiology
Britta Langen, Nils Rudqvist, Khalil Helou, Eva B Forssell-Aronsson
INTRODUCTION: Targeted α-therapy is a promising treatment option for various types of malignant tumors. Radiolabeled cancer-seeking agents, however, undergo degradation resulting in a certain percentage of free radionuclide in the body. The radiohalogen (211)At accumulates in various tissues with specifically high uptake in the thyroid. When normal thyroid function is disturbed due to ionizing radiation (IR) exposure, deleterious effects can occur in tissues that depend on thyroid hormone (TH) regulation for normal physiological function...
October 20, 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
C Sainz Fernández, L S Quindós Poncela, A Fernández Villar, I Fuente Merino, J L Gutierrez-Villanueva, S Celaya González, L Quindós López, J Quindós López, E Fernández, J Remondo Tejerina, J L Martín Matarranz, M García Talavera
One of the requirements of the recently approved EU-BSS (European Basic Safety Standards Directive, EURATOM, 2013) is the design and implementation of national radon action plans in the member states (Annex XVIII). Such plans require radon surveys. The analysis of indoor radon data is supported by the existing knowledge about geogenic radiation. With this aim, we used the terrestrial gamma dose rate data from the MARNA project. In addition, we considered other criterion regarding the surface of Spain, population, permeability of rocks, uranium and radium contain in soils because currently no data are available related to soil radon gas concentration and permeability in Spain...
September 25, 2016: Journal of Environmental Radioactivity
H C Gits, J Dow, M Feng, M M Matuszak
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
J H Lefevre, S Benoist
GOAL: To report the current clinical practice of French physicians for rectal cancer in various complex settings. METHODS: Nineteen clinical situations and four surveillance modalities were proposed to a panel of experts via 11 learned societies. The answers of 48 experts and the impact of colorectal specialists on therapeutic options were compared to those of other participants. RESULTS: A total of 722 physicians [surgeons=319 (44%), gastro-intestinal oncologists=305 (42%), radiotherapists=98 (14%)] participated in this study...
September 20, 2016: Journal of Visceral Surgery
Koujiro Ikushima, Hidetaka Arimura, Ze Jin, Hidetake Yabu-Uchi, Jumpei Kuwazuru, Yoshiyuki Shioyama, Tomonari Sasaki, Hiroshi Honda, Masayuki Sasaki
We have proposed a computer-assisted framework for machine-learning-based delineation of gross tumor volumes (GTVs) following an optimum contour selection (OCS) method. The key idea of the proposed framework was to feed image features around GTV contours (determined based on the knowledge of radiation oncologists) into a machine-learning classifier during the training step, after which the classifier produces the 'degree of GTV' for each voxel in the testing step. Initial GTV regions were extracted using a support vector machine (SVM) that learned the image features inside and outside each tumor region (determined by radiation oncologists)...
September 8, 2016: Journal of Radiation Research
Turki Almatani, Richard P Hugtenburg, Ryan D Lewis, Susan E Barley, Mark A Edwards
OBJECTIVE: Cone beam CT (CBCT) images contain more scatter than a conventional CT image and therefore provide inaccurate Hounsfield units (HUs). Consequently, CBCT images cannot be used directly for radiotherapy dose calculation. The aim of this study is to enable dose calculations to be performed with the use of CBCT images taken during radiotherapy and evaluate the necessity of replanning. METHODS: A patient with prostate cancer with bilateral metallic prosthetic hip replacements was imaged using both CT and CBCT...
October 2016: British Journal of Radiology
Sean L Berry, Amanda Boczkowski, Rongtao Ma, James Mechalakos, Margie Hunt
PURPOSE: We investigated the sources of variability in radiation therapy treatment plan output between planners within a single institution. METHODS AND MATERIALS: Forty treatment planners across 5 campuses of an institution created a plan on the same thoracic esophagus patient computed tomography scan and structure set. Plans were scored and ranked based on the planner's adherence to an ordered list of target dose coverage and normal tissue evaluation criteria...
May 8, 2016: Practical Radiation Oncology
Wolfgang-Ulrich Müller, Augusto Giussani, Werner Rühm, Jean-Francois Lecomte, John Harrison, Michaela Kreuzer, Christina Sobotzki, Joachim Breckow
ICRP suggested a strategy based on the distinction between a protection approach for dwellings and one for workplaces in the previous recommendations on radon. Now, the Commission recommends an integrated approach for the protection against radon exposure in all buildings irrespective of their purpose and the status of their occupants. The strategy of protection in buildings, implemented through a national action plan, is based on the application of the optimisation principle below a derived reference level in concentration (maximum 300 Bq m(-3))...
August 2016: Radiation and Environmental Biophysics
Amy T Y Chang, Albert W M Hung, Fion W K Cheung, Michael C H Lee, Oscar S H Chan, Helen Philips, Yung-Tang Cheng, Wai-Tong Ng
PURPOSE: Intensity modulated radiation therapy (IMRT) is widely used to achieve a highly conformal dose and improve treatment outcome. However, plan quality and planning time are institute and planner dependent, and no standardized tool exists to recognize an optimal plan. RapidPlan, a knowledge-based algorithm, can generate constraints to assist optimization and produce high-quality IMRT plans. This report evaluated the quality and efficiency of using RapidPlan in nasopharyngeal carcinoma (NPC) IMRT planning...
July 1, 2016: International Journal of Radiation Oncology, Biology, Physics
Zhang Zhang, Michelle Wodzak, Olivier Belzile, Heling Zhou, Brock Sishc, Hao Yan, Strahinja Stojadinovic, Ralph P Mason, Rolf A Brekken, Rajiv Chopra, Michael D Story, Robert Timmerman, Debabrata Saha
Stereotactic body radiation therapy (SBRT) has found an important role in the treatment of patients with non-small cell lung cancer, demonstrating improvements in dose distribution and even tumor cure rates, particularly for early-stage disease. Despite its emerging clinical efficacy, SBRT has primarily evolved due to advances in medical imaging and more accurate dose delivery, leaving a void in knowledge of the fundamental biological mechanisms underlying its activity. Thus, there is a critical need for the development of orthotropic animal models to further probe the biology associated with high-dose-per-fraction treatment typical of SBRT...
June 2016: Radiation Research
Patrick Lorimer, Zvonimir Milas
Most cutaneous malignancies of the head and neck (HN) are non-melanoma skin cancers, predominantly basal cell carcinomas (BCCs) and squamous cell carcinomas (SCCs). Less common entities include Merkel cell carcinoma (MCC), sebaceous carcinoma (SC), and angiosarcoma. Treatment is based on histology subtype, stage, and extent of involvement. Surgery is the primary means of treatment and includes wide local excision, Mohs micrographic surgery, sentinel lymph node biopsy, and cervical lymphadenectomy. Multidisciplinary management including radiation and targeted chemotherapy are critical adjuncts to surgery...
June 2016: Seminars in Oncology
Kati Matilainen, Sanna-Mari Ahonen, Päivi Kankkunen, Mari Kangasniemi
BACKGROUND: Considering the ethics of each profession is important as inter-professional collaboration increases. Professional ethics creates a basis for radiographers' work, as it includes values and principles, together with rights and duties that guide and support professionals. However, little is known about radiographers' rights when it comes to professional ethics. THE AIM: The aim of this study was to describe radiographers' perceptions and experiences of their professional rights...
May 10, 2016: Scandinavian Journal of Caring Sciences
Tawfik Giaddui, Wenzhou Chen, Jialu Yu, Liyong Lin, Charles B Simone, Lulin Yuan, Yutao U T Gong, Q Jackie Wu, Radhe Mohan, Xiaodong Zhang, Jaques B Bluett, Michael Gillin, Kevin Moore, Elizabeth O'Meara, Jennifer Presley, Jeffrey D Bradley, Zhongxing Liao, James Galvin, Ying Xiao
BACKGROUND: To establish the feasibility of the dosimetric compliance criteria of the RTOG 1308 trial through testing against Intensity Modulation Radiation Therapy (IMRT) and Passive Scattering Proton Therapy (PSPT) plans. METHODS: Twenty-six lung IMRT and 26 proton PSPT plans were included in the study. Dose Volume Histograms (DVHs) for targets and normal structures were analyzed. The quality of IMRT plans was assessed using a knowledge-based engineering tool...
2016: Radiation Oncology
Lionel Perrier, Magali Morelle, Pascal Pommier, Pierre Boisselier, Bernard Coche-Dequeant, Olivier Gallocher, Marc Alfonsi, Etienne Bardet, Michel Rives, Valentin Calugaru, Enrique Chajon, Georges Noel, Hinda Mecellem, David Pérol, Sophie Dussart, Philippe Giraud
PURPOSE: This cost analysis aimed to prospectively assess differences in costs between TomoTherapy and volumetric modulated arc therapy (VMAT) in patients with head and neck cancer. METHODS AND MATERIALS: Economic data were gathered from a multicenter study. However, randomization was not possible due to the availability of equipment. Costs were calculated using the microcosting technique from the hospital's perspective (in 2013 euros), and the time horizon was radiation therapy...
June 1, 2016: International Journal of Radiation Oncology, Biology, Physics
D Pham, N Hardcastle, F Foroudi, T Kron, M Bressel, B Hilder, B Chesson, R Oates, R Montgomery, D Ball, S Siva
AIMS: In technically advanced multicentre clinical trials, participating centres can benefit from a credentialing programme before participating in the trial. Education of staff in participating centres is an important aspect of a successful clinical trial. In the multicentre study of fractionated versus single fraction stereotactic ablative body radiotherapy in lung oligometastases (TROG 13.01), knowledge transfer of stereotactic ablative body radiotherapy techniques to the local multidisciplinary team is intended as part of the credentialing process...
September 2016: Clinical Oncology: a Journal of the Royal College of Radiologists
Cristina Suárez-Mejías, Jose Antonio Pérez-Carrasco, Carmen Serrano, Jose Luis López-Guerra, Carlos Parra-Calderón, Tomás Gómez-Cía, Begoña Acha
An innovative algorithm has been developed for the segmentation of retroperitoneal tumors in 3D radiological images. This algorithm makes it possible for radiation oncologists and surgeons semiautomatically to select tumors for possible future radiation treatment and surgery. It is based on continuous convex relaxation methodology, the main novelty being the introduction of accumulated gradient distance, with intensity and gradient information being incorporated into the segmentation process. The algorithm was used to segment 26 CT image volumes...
April 21, 2016: Medical & Biological Engineering & Computing
Mark Ruschin, Arjun Sahgal, Sara Iradji, Hany Soliman, Claudia Leavens, Young Lee
OBJECTIVE: To investigate brain radiation dose in complex cases arising from two stereotactic linear accelerator designs and to present a method for comparing brain dose to published data. METHODS: Two head designs were considered: Beam Modulator (BM) and Agility (AG). 12 patients treated on BM were replanned with AG. Planning objectives were: minimize brain dose and satisfy target coverage and organs at risk dose constraints. Each of the 36 targets was analyzed for conformality index (CI Paddick), gradient index (GI) and homogeneity index (HI)...
July 2016: British Journal of Radiology
Ruchi R Deshpande, John DeMarco, James W Sayre, Brent J Liu
PURPOSE: Clinical data that are generated through routine radiation therapy procedures can be leveraged as a source of knowledge to provide evidence-based decision support for future patients. Treatment planning in radiation therapy often relies on trial-and-error iterations, experience, judgment calls and general guidelines. The authors present a knowledge-driven decision support system that assists clinicians by reducing some of the uncertainties associated with treatment planning and provides quantified empirical estimates to help minimize the radiation dose to healthy critical structures surrounding the tumor...
April 12, 2016: International Journal of Computer Assisted Radiology and Surgery
Anita T Mohan, Michel Saint-Cyr
The role and choice of preoperative imaging for planning in breast reconstruction is still a disputed topic in the reconstructive community, with varying opinion on the necessity, the ideal imaging modality, costs and impact on patient outcomes. Since the advent of perforator flaps their use in microsurgical breast reconstruction has grown. Perforator based flaps afford lower donor morbidity by sparing the underlying muscle provide durable results, superior cosmesis to create a natural looking new breast, and are preferred in the context of radiation therapy...
April 2016: Gland Surgery
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