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Radiation therapy planning

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https://www.readbyqxmd.com/read/28214145/effect-of-reduction-mammoplasty-on-acute-radiation-side-effects-and-use-of-lumpectomy-cavity-boosts
#1
Jolinta Y Lin, Rachel Bluebond-Langner, Enid Choi, Sally Cheston, Elizabeth M Nichols, Randi J Cohen, Soren M Bentzen, Cynthia Drogula, Susan Kesmodel, Emily Bellavance, Paula Rosenblatt, Katherine Tkaczuk, Sheri Slezak, Steven J Feigenberg
PURPOSE: Reduction mammoplasty (RM) during breast-conserving surgery is popular among women with large-volume breasts because it reduces redundant breast folds and may decrease skin-related morbidity from radiation therapy. However, RM may obscure the lumpectomy cavity (LC) and pose challenges to administering an LC boost, potentially affecting local control. We investigated the impact of RM on acute side effects and use of LC boosts. METHODS AND MATERIALS: The records of 645 consecutive women treated with whole-breast irradiation at an urban university and 2 community practices between January 2012 and December 2014 were reviewed on an institutional review board-approved study...
January 7, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28211218/the-integration-of-mri-in-radiation-therapy-collaboration-of-radiographers-and-radiation-therapists
#2
Robba Rai, Shivani Kumar, Vikneswary Batumalai, Doaa Elwadia, Lucy Ohanessian, Ewa Juresic, Lynette Cassapi, Shalini K Vinod, Lois Holloway, Paul J Keall, Gary P Liney
The increased utilisation of magnetic resonance imaging (MRI) in radiation therapy (RT) has led to the implementation of MRI simulators for RT treatment planning and influenced the development of MRI-guided treatment systems. There is extensive literature on the advantages of MRI for tumour volume and organ-at-risk delineation compared to computed tomography. MRI provides both anatomical and functional information for RT treatment planning (RTP) as well as quantitative information to assess tumour response for adaptive treatment...
February 16, 2017: Journal of Medical Radiation Sciences
https://www.readbyqxmd.com/read/28211070/use-of-proximal-operator-graph-solver-for-radiation-therapy-inverse-treatment-planning
#3
Xinmin Liu, Charles Pelizzari, Andrew H Belcher, Zachary Grelewicz, Rodney D Wiersma
PURPOSE: Most radiation therapy optimization problems can be formulated as an unconstrained problem and solved efficiently by quasi-Newton methods such as the Limited-memory Broyden-Fletcher-Goldfarb-Shanno (L-BFGS) algorithm. However, several next generation planning techniques such as total variation regularization based optimization and MV+kV optimization, involve constrained or mixed-norm optimization, and cannot be solved by quasi-Newton methods. Using standard optimization algorithms on such problems often leads to prohibitively long optimization times and large memory requirements...
February 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28205307/segmentation-of-organs-at-risks-in-head-and-neck-ct-images-using-convolutional-neural-networks
#4
Bulat Ibragimov, Lei Xing
PURPOSE: Accurate segmentation of organs-at-risks (OARs) is the key step for efficient planning of radiation therapy for head and neck (HaN) cancer treatment. In the work, we proposed the first deep learning-based algorithm, for segmentation of OARs in HaN CT images, and compared its performance against state-of-the-art automated segmentation algorithms, commercial software, and interobserver variability. METHODS: Convolutional neural networks (CNNs)-a concept from the field of deep learning-were used to study consistent intensity patterns of OARs from training CT images and to segment the OAR in a previously unseen test CT image...
February 2017: Medical Physics
https://www.readbyqxmd.com/read/28203163/is-the-deep-inspiration-breath-hold-technique-superior-to-the-free-breathing-technique-in-cardiac-and-lung-sparing-while-treating-both-left-sided-post-mastectomy-chest-wall-and-supraclavicular-regions
#5
Anupama Darapu, Rajesh Balakrishnan, Patricia Sebastian, Mohamathu Rafic Kather Hussain, Paul Ravindran, Subhashini John
AIMS: To evaluate the efficacy of the deep inspirational breath-hold (DIBH) technique and its dosimetric advantages over the free breathing (FB) technique in cardiac (heart and left anterior descending artery [LAD]) and ipsilateral lung sparing in left-sided post-mastectomy field-in-field conformal radiotherapy. DIBH is highly reproducible, and this study aims to find out its dosimetric benefits over FB. MATERIALS AND METHODS: Nineteen left-sided mastectomy patients were immobilized using breast boards with both arms positioned above the head...
January 2017: Case Reports in Oncology
https://www.readbyqxmd.com/read/28197653/does-selective-pleural-irradiation-of-malignant-pleural-mesothelioma-allow-radiation-dose-escalation-a-planning-study
#6
A Botticella, G Defraene, K Nackaerts, C Deroose, J Coolen, P Nafteux, B Vanstraelen, S Joosten, L A W Michiels, S Peeters, D De Ruysscher
BACKGROUND: After lung-sparing radiotherapy for malignant pleural mesothelioma (MPM), local failure at sites of previous gross disease represents the dominant form of failure. Our aim is to investigate if selective irradiation of the gross pleural disease only can allow dose escalation. MATERIALS AND METHODS: In all, 12 consecutive stage I-IV MPM patients (6 left-sided and 6 right-sided) were retrospectively identified and included. A magnetic resonance imaging-based pleural gross tumor volume (GTV) was contoured...
February 14, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28196607/development-of-a-model-web-based-system-to-support-a-statewide-quality-consortium-in-radiation-oncology
#7
Jean M Moran, Mary Feng, Lisa A Benedetti, Robin Marsh, Kent A Griffith, Martha M Matuszak, Michael Hess, Matthew McMullen, Jennifer H Fisher, Teamour Nurushev, Margaret Grubb, Stephen Gardner, Daniel Nielsen, Reshma Jagsi, James A Hayman, Lori J Pierce
PURPOSE: A database in which patient data are compiled allows analytic opportunities for continuous improvements in treatment quality and comparative effectiveness research. We describe the development of a novel, web-based system that supports the collection of complex radiation treatment planning information from centers that use diverse techniques, software, and hardware for radiation oncology care in a statewide quality collaborative, the Michigan Radiation Oncology Quality Consortium (MROQC)...
October 20, 2016: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28195561/automatic-and-hierarchical-segmentation-of-the-human-skeleton-in-ct-images
#8
Yabo Fu, Shi Liu, Hui Harold Li, Deshan Yang
Accurate segmentation of each bone in human skeleton is useful in many medical disciplines. Results of bone segmentation could facilitate bone disease diagnosis and post-treatment assessment, and support planning and image guidance for many treatment modalities including surgery and radiation therapy. As a medium level medical image processing task, accurate bone segmentation can facilitate automatic internal organ segmentation by providing stable structural reference for inter- or intra-patient registration and internal organ localization...
February 14, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28195507/predicting-risk-factors-for-radiation-pneumonitis-after-stereotactic-body-radiation-therapy-for-primary-or-metastatic-lung-tumors
#9
Mitsuru Okubo, Tomohiro Itonaga, Tatsuhiko Saito, Sachika Shiraishi, Ryuji Mikami, Hidetugu Nakayama, Akira Sakurada, Shinji Sugahara, Kiyoshi Koizumi, Koichi Tokuuye
OBJECTIVES: To investigate risk factors for radiation-induced pneumonitis (RP) after hypofractionated stereotactic body radiotherapy (SBRT) in patients with lung tumors. METHODS: From May 2004 to January 2016, 66 patients with 71 primary or metastatic lung tumors were treated with SBRT; these 71 cases were retrospectively analyzed for RP. To explore the risk factors for RP, the following factors were investigated: age, sex, performance status, operability, number of treatments, respiratory gating, pulmonary emphysema, tumor location, and subclinical interstitial lung disease (ILD)...
February 14, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28192285/real-time-detection-of-fast-and-thermal-neutrons-in-radiotherapy-with-cmos-sensors
#10
Nicolas Arbor, Stephane Higueret, Halima Elazhar, Rodolphe Combe, Philippe Meyer, Nicolas Dehaynin, Florence Taupin, Daniel Husson
The peripheral dose distribution is a growing concern for the improvement of new external radiation modalities. Secondary particles, especially photo-neutrons produced by the accelerator, irradiate the patient more than tens of centimeters away from the tumor volume. However the out-of-field dose is still not estimated accurately by the treatment planning softwares. This study demonstrates the possibility of using a specially designed CMOS sensor for fast and thermal neutron monitoring in radiotherapy. The 14 microns-thick sensitive layer and the integrated electronic chain of the CMOS are particularly suitable for real-time measurements in γ/n mixed fields...
March 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28188567/breast-cancer-patients-perceptions-of-a-virtual-learning-environment-for-pretreatment-education
#11
Yobelli Alexandra Jimenez, Wei Wang, Kirsty Stuart, Steven Cumming, David Thwaites, Sarah Lewis
The process and technicalities of radiation therapy (RT) for cancer treatment can be challenging for patients to understand as RT involves complex procedures, highly specialised equipment, and radiation itself has limited sensory characteristics. Hence, it is imperative that education programs are specifically planned and developed to suit the needs of patients, address radiation as an entity and include salient visual aids. In this context, the Virtual Environment for Radiotherapy Training (VERT) system, primarily created for RT practitioner simulation, may provide unique opportunities for patient education...
February 10, 2017: Journal of Cancer Education: the Official Journal of the American Association for Cancer Education
https://www.readbyqxmd.com/read/28187887/collapsed-cone-dose-calculations-for-heterogeneous-tissues-in-brachytherapy-using-primary-and-scatter-separation-source-data
#12
Anders Ahnesjö, Bob van Veelen, Åsa Carlsson Tedgren
BACKGROUND AND OBJECTIVE: Brachytherapy is a form of radiation therapy using sealed radiation sources inserted within or in the vicinity of the tumor of, e.g., gynecological, prostate or head- and neck cancers. Accurate dose calculation is a crucial part of the treatment planning. Several reviews have called for clinical software with model-based algorithms that better take into account the effects of patient individual distribution of tissues, source-channel and shielding attenuation than the commonly employed TG-43 formalism which simply map homogeneous water dose distributions onto the patient...
February 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28183159/a-novel-schedule-of-accelerated-partial-breast-radiation-using-intensity-modulated-radiation-therapy-in-elderly-patients-survival-and-toxicity-analysis-of-a-prospective-clinical-trial
#13
Mutlay Sayan, Karen Wilson, Carl Nelson, Havaleh Gagne, Deborah Rubin, Ruth Heimann
Purpose: Several accelerated partial breast radiation (APBR) techniques have been investigated in patients with early-stage breast cancer (BC); however, the optimal treatment delivery techniques remain unclear. We evaluated the feasibility and toxicity of APBR delivered using intensity-modulated radiation therapy (IMRT) in elderly patients with stage I BC, using a novel fractionation schedule. Materials and Methods: Forty-two patients aged ≥65 years, with stage I BC who underwent breast conserving surgery were enrolled in a phase I/II study evaluating APBR using IMRT...
February 13, 2017: Radiation Oncology Journal
https://www.readbyqxmd.com/read/28181362/risk-factors-for-radiation-induced-optic-neuropathy-a-case-control-study
#14
Ian Ferguson, Julie Huecker, Jiayi Huang, Collin McClelland, Gregory Van Stavern
IMPORTANCE: Identifying risk factors for RION could promote a more conservative approach to radiation treatment planning in vulnerable patients. BACKGROUND: This study explored possible factors beyond radiation dose associated with the development of radiation-induced optic neuropathy (RION) after external beam radiation therapy. DESIGN: This was a retrospective case-control study conducted at a university hospital tertiary care center. PARTICIPANTS: Cases (n = 14) meeting criteria for a diagnosis of RION by neuro- ophthalmologic exam were identified from a single-center neuro-ophthalmology database...
February 9, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28174660/mrgfus-for-desmoid-tumors-within-the-thigh-early-clinical-experiences
#15
Matthew D Bucknor, Viola Rieke
BACKGROUND: Desmoid tumors are benign but locally aggressive non-malignant tumors derived from fibroblasts. Surgery, chemotherapy, and radiation therapy have been the mainstay of treatment, but recurrence is common and side effects can result in significant morbidity. In this case series, we highlight our experiences performing treatments in the thigh, including strategies for optimizing ablation size and safety. CASE PRESENTATION: Since December 2014, 14 magnetic resonance-guided focused ultrasound (MRgFUS) treatments for desmoid tumors were performed at our institution in seven patients...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/28174492/boron-neutron-capture-therapy-for-malignant-melanoma-first-clinical-case-report-in-china
#16
Zhong Yong, Zewen Song, Yongmao Zhou, Tong Liu, Zizhu Zhang, Yanzhong Zhao, Yang Chen, Congjun Jin, Xiang Chen, Jianyun Lu, Rui Han, Pengzhou Li, Xulong Sun, Guohui Wang, Guangqing Shi, Shaihong Zhu
A phase I/II clinical trial for treating malignant melanoma by boron neutron capture therapy (BNCT) was designed to evaluate whether the world's first in-hospital neutron irradiator (IHNI) was qualified for BNCT. In this clinical trial planning to enroll 30 patients, the first case was treated on August 19, 2014. We present the protocol of this clinical trial, the treating procedure, and the clinical outcome of this first case. Only grade 2 acute radiation injury was observed during the first four weeks after BNCT and the injury healed after treatment...
December 2016: Chinese Journal of Cancer Research, Chung-kuo Yen Cheng Yen Chiu
https://www.readbyqxmd.com/read/28173994/intraoperative-high-dose-rate-brachytherapy-an-american-brachytherapy-society-consensus-report
#17
REVIEW
S Lloyd, K M Alektiar, S Nag, Y J Huang, C L Deufel, F Mourtada, D K Gaffney
PURPOSE: This report presents recommendations from the American Brachytherapy Society for the use of intraoperative high-dose-rate (IOHDR) brachytherapy. METHODS AND MATERIALS: Members of the American Brachytherapy Society with expertise in IOHDR formulated this document based on their clinical experience and a review of the literature. This report covers the use of IOHDR in colorectal cancer, soft tissue sarcoma, gynecologic cancers, head and neck cancers, and pediatric cancers...
February 4, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28168936/dosimetric-comparison-of-real-time-mri-guided-tri-cobalt-60-versus-linear-accelerator-based-stereotactic-body-radiation-therapy-lung-cancer-plans
#18
Andrzej P Wojcieszynski, Patrick M Hill, Stephen A Rosenberg, Craig R Hullett, Zacariah E Labby, Bhudatt Paliwal, Mark W Geurts, R Adam Bayliss, John E Bayouth, Paul M Harari, Michael F Bassetti, Andrew M Baschnagel
PURPOSE: Magnetic resonance imaging-guided radiation therapy has entered clinical practice at several major treatment centers. Treatment of early-stage non-small cell lung cancer with stereotactic body radiation therapy is one potential application of this modality, as some form of respiratory motion management is important to address. We hypothesize that magnetic resonance imaging-guided tri-cobalt-60 radiation therapy can be used to generate clinically acceptable stereotactic body radiation therapy treatment plans...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28168813/the-impacts-of-mid-treatment-cbct-guided-patient-repositioning-on-target-coverage-during-lung-vmat
#19
Dominique Mathieu, Marie-Pierre Campeau, Stéphane Bedwani, David Roberge, Robert Doucet, Karim Zerouali, Houda Bahig, Toni Vu, Louise Lambert, Laura Masucci, Edith Filion
INTRODUCTION: The purpose of this study is quantify intrafraction motion (IFM) during lung volumetric-modulated arc therapy (VMAT) and evaluate the impact of mid-treatment cone beam computed tomography (CBCT)-guided patient repositioning on target coverage. METHOD: This analysis included lung tumours treated with VMAT to 50-60 Gy in 3-5 fractions. Treatment planning was based on four-dimensional CT scans from which internal tumour volumes (ITV) were derived. An isotropic 5 mm margin was added to obtain the final planning target volume (PTV)...
February 7, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/28168163/results-of-a-single-institution-experience-with-dose-escalated-chemoradiation-for-locally-advanced-unresectable-non-small-cell-lung-cancer
#20
Mark E Bernard, Scott M Glaser, Beant S Gill, Sushil Beriwal, Dwight E Heron, James D Luketich, David M Friedland, Mark A Socinski, Joel S Greenberger
BACKGROUND: We determined factors associated with morbidity and outcomes of a series of non-small cell lung cancer (NSCLC) patients treated with dose-escalated chemoradiotherapy at the University of Pittsburgh Lung Cancer Program. METHODS AND MATERIALS: The records of 170 stage III NSCLC patients treated with definitive intent were retrospectively reviewed. All patients received four-dimensional CT simulation scan and had respiratory gating if tumor movement exceeded 5 mm...
2017: Frontiers in Oncology
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