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https://www.readbyqxmd.com/read/28086954/a-comparative-analysis-between-sequential-boost-and-integrated-boost-intensity-modulated-radiation-therapy-with-concurrent-chemotherapy-for-locally-advanced-head-and-neck-cancer
#1
Gregory Vlacich, Mark J Stavas, Praveen Pendyala, Shaeu-Chiann Chen, Yu Shyr, Anthony J Cmelak
BACKGROUND: Planning and delivery of IMRT for locally advanced head and neck cancer (LAHNC) can be performed using sequential boost or simultaneous integrated boost (SIB). Whether these techniques differ in treatment-related outcomes including survival and acute and late toxicities remain largely unexplored. METHODS: We performed a single institutional retrospective matched cohort analysis on patients with LAHNC treated with definitive chemoradiotherapy to 69.3 Gy in 33 fractions...
January 13, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28077128/treatment-planning-comparison-of-impt-vmat-and-4%C3%AF-radiotherapy-for-prostate-cases
#2
Angelia Tran, Jingjing Zhang, Kaley Woods, Victoria Yu, Dan Nguyen, Gary Gustafson, Lane Rosen, Ke Sheng
BACKGROUND: Intensity-modulated proton therapy (IMPT), non-coplanar 4π intensity-modulated radiation therapy (IMRT), and volumetric-modulated arc therapy (VMAT) represent the most advanced treatment methods based on heavy ion and X-rays, respectively. Here we compare their performance for prostate cancer treatment. METHODS: Ten prostate patients were planned using IMPT with robustness optimization, VMAT, and 4π to an initial dose of 54 Gy to a clinical target volume (CTV) that encompassed the prostate and seminal vesicles, then a boost prescription dose of 25...
January 11, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28076338/quantification-of-confounding-factors-in-mri-based-dose-calculations-as-applied-to-prostate-imrt
#3
Matteo Maspero, Peter R Seevinck, Gerald Schubert, Michaela A U Hoesl, Bram van Asselen, Max A Viergever, Jan J W Lagendijk, Gert J Meijer, Cornelis A T van den Berg
Magnetic resonance (MR)-only radiotherapy treatment planning requires pseudo-CT (pCT) images to enable MR-based dose calculations. To verify the accuracy of MR-based dose calculations, institutions interested in introducing MR-only planning will have to compare pCT-based and computer tomography (CT)-based dose calculations. However, interpreting such comparison studies may be challenging, since potential differences arise from a range of confounding factors which are not necessarily specific to MR-only planning...
January 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28075206/hydrogel-rectum-prostate-spacers-mitigate-the-uncertainties-in-proton-relative-biological-effectiveness-associated-with-anterior-oblique-beams
#4
Tracy S A Underwood, Justin C Voog, Maryam Moteabbed, Shikui Tang, Edward Soffen, Oren Cahlon, Hsiao-Ming Lu, Anthony L Zietman, Jason A Efstathiou, Harald Paganetti
AIM: Anterior-oblique (AO) proton beams can form an attractive option for prostate patients receiving external beam radiotherapy (EBRT) as they avoid the femoral heads. For a cohort with hydrogel prostate-rectum spacers, we asked whether it was possible to generate AO proton plans robust to end-of-range elevations in linear energy transfer (LET) and modeled relative biological effectiveness (RBE). Additionally we considered how rectal spacers influenced planned dose distributions for AO and standard bilateral (SB) proton beams versus intensity-modulated radiotherapy (IMRT)...
January 11, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28072395/evaluation-of-adaptive-treatment-planning-for-patients-with-non-small-cell-lung-cancer
#5
Hualiang Zhong, Salim Siddiqui, Benjamin Movsas, Indrin Chetty
The purpose of this study was to develop metrics to evaluate uncertainties in deformable dose accumulation (DDA) for patients with non-small cell lung cancer (NSCLC). Initial treatment plans (primary) and cone-beam CT (CBCT) images were retrospectively processed for seven NSCLC patients, who showed significant tumor regression during the course of treatment. Each plan was developed with IMRT for 2 Gy��33 fractions. A B-spline-based DIR algorithm was used to register weekly CBCT images to a reference image acquired at fraction 21 and the resultant displacement vector fields (DVFs) were then modified using a finite element method (FEM)...
January 10, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28070838/late-toxicity-evolving-radiotherapy-techniques-and-quality-of-life-in-nasopharyngeal-carcinoma
#6
Luciana Lastrucci, Silvia Bertocci, Vittorio Bini, Simona Borghesi, Roberta De Majo, Andrea Rampini, Paola Pernici, Pietro Giovanni Gennari
PURPOSE: To analyze quality of life (QoL) and functional state (FS) by patient-reported outcome (PRO) questionnaires (FACT-G, FACT-NP, PSS-HN, XeQOLS, and EQ-5D-3L) in long-term survivors nasopharyngeal carcinoma (NPC) treated with conventional radiotherapy (RT) and intensity modulated radiotherapy (IMRT). METHODS: 25 patients answered to five questionnaires about QoL and FS. All patients were assessed also for late toxicity. RESULTS: Functional Assessment of Cancer Therapy-General (FACT-G) and Performance Status Scale Head and Neck (PSS-HN) scores were significantly elevated (better QoL) in age <50 years (p = 0...
January 9, 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28068238/hematologic-nadirs-during-chemoradiation-for-anal-cancer-temporal-characterization-and-dosimetric-predictors
#7
Andrew Y Lee, Daniel W Golden, Jose G Bazan, Malgorzata Kopec, Charles A Pelizzari, Sonya Aggarwal, Daniel T Chang, Stanley L Liauw
PURPOSE: Pelvic bone marrow (BM) constraints may offer a means to reduce the toxicity commonly associated with chemoradiation for anal cancer. We conducted a bi-institutional analysis of dose-volume metrics in a time-sensitive fashion to devise practical metrics to minimize hematologic toxicity. METHODS AND MATERIALS: Fifty-six anal cancer patients from 2 institutions received definitive radiation therapy (median primary dose of 54 Gy) using intensity modulated radiation therapy (IMRT, n=49) or 3-dimensional (3D) conformal therapy (n=7) with concurrent 5-fluorouracil (5-FU) and mitomycin C...
February 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28065699/evaluation-of-mlc-performance-in-vmat-and-dynamic-imrt-by-log-file-analysis
#8
José Olasolo-Alonso, Alejandro Vázquez-Galiñanes, Santiago Pellejero-Pellejero, José Fernando Pérez-Azorín
PURPOSE: This multi-institution study assessed the positioning accuracy of multileaf collimators (MLC) by analyzing log files. It determined the main machine parameters that affect MLC positioning errors for pre-TrueBeam (Clinac) and TrueBeam linacs. METHODS: Around 30,000 dIMRT and VMAT log files belonging to 6 linacs from 4 different centers were analyzed. An in-house software was used to calculate 95th percentile and RMS error values and their correlation with certain parameters such as maximum leaf speed, mean leaf speed and gantry angle...
January 5, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28063696/association-of-post-treatment-positron-emission-tomography-with-locoregional-control-and-survival-after-radiation-therapy-for-squamous-cell-carcinoma-of-the-vulva
#9
Yuan James Rao, Comron Hassanzadeh, Anupama Chundury, Caressa Hui, Barry A Siegel, Farrokh Dehdashti, Todd DeWees, Daniel Mullen, Matthew A Powell, David G Mutch, Julie K Schwarz, Perry W Grigsby
BACKGROUND/PURPOSE: The aim of this study was to investigate the use of post-treatment F-18 fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) for vulvar cancer and compare metabolic response to clinical outcomes. MATERIALS/METHODS: This retrospective study included 21 patients with vulvar squamous cell carcinoma treated with curative-intent radiation between 2007 and 2015. All patients received intensity-modulated radiation treatment (IMRT), a pre-treatment FDG/PET-CT, and a post-treatment FDG-PET/CT performed at a median time of 3months post-IMRT...
January 4, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28061474/tomotherapy-as-an-adjuvant-treatment-for-gastroesophageal-junction-and-stomach-cancer-may-reduce-bowel-and-bone-marrow-toxicity-compared-to-intensity-modulated-radiotherapy-and-volumetric-modulated-arc-therapy
#10
Xin Wang, Yuan Tian, Yuan Tang, Zhi-Hui Hu, Jia-Jia Zhang, Gui-Shan Fu, Pan Ma, Hua Ren, Tao Zhang, Ning Li, Wen-Yang Liu, Hui Fang, Ye-Xiong Li, Jing Jin
PURPOSE: To compare dosimetric parameters of intensity-modulated radiotherapy (IMRT), volumetric-modulated arc therapy (VMAT) and tomotherapy (TOMO) in the adjuvant treatment of gastroesophageal junction (GEJ)/stomach cancer. The planning goal was to maintain high target coverage while keeping the dose to the bowel and bone marrow (BM) as low as possible. MATERIALS AND METHODS: After curative surgery, 16 patients with GEJ/stomach cancer were re-planned by coplanar IMRT (five fixed beam), VMAT (double-arc), and TOMO...
January 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/28059560/dose-specification-for-hippocampal-sparing-whole-brain-radiotherapy-hs-wbrt-considerations-from-the-uk-hippo-trial-qa-programme
#11
Daniel Megias, Mark Phillips, Laura Clifton-Hadley, Elizabeth Harron, David J Eaton, Paul Sanghera, Gillian Whitfield
OBJECTIVES: The HIPPO trial is a UK randomised phase II trial of Hippocampal Sparing (HS) versus Conventional Whole Brain Radiotherapy after surgical resection or radiosurgery in favourable prognosis patients with 1-4 brain metastases. Each participating centre completed a planning benchmark case as part of the dedicated radiotherapy trials quality assurance programme (RTQA), promoting the safe and effective delivery of HS Intensity Modulated Radiotherapy (IMRT) in a multi-centre trial setting...
January 6, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28056518/mucosal-sparing-radiation-therapy-in-resected-oropharyngeal-cancer
#12
Mauricio E Gamez, Michele Y Halyard, Michael L Hinni, Richard E Hayden, Thomas H Nagel, Carlos E Vargas, William W Wong, Kelly K Curtis, Matthew A Zarka, Daniel Ma, Samir H Patel
PURPOSE: To report the outcomes of patients with favorable risk oropharyngeal cancer that underwent adjuvant radiation therapy with omission of the primary site from the clinical target volume (CTV). MATERIAL/METHODS: A retrospective study of 40 patients treated with transoral surgery (TOS) followed by neck only radiation using intensity modulated radiation therapy (IMRT) with exclusion of the primary site. For all patients, a CTV of the primary surgical bed was contoured to obtain the estimated incidental dose to the primary site...
December 1, 2016: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/28055973/outcome-and-long-term-efficacy-of-four-facio-cervical-fields-conformal-radiotherapy-for-nasopharyngeal-carcinoma
#13
Wang Fangzheng, Jiang Chuner, Wang Lei, Chen Weijun, Xu Min, Sun Quanquan, Liu Tongxin, Rihito Aizawa, Masoto Sakamoto, Fu Zhenfu
PURPOSE: To evaluate the outcomes of 255 patients with nasopharyngeal carcinoma (NPC) treated with four facio-cervical fields conformal radiotherapy (4F-CRT). RESULTS: In one patient's 3 different RT treatment modalities, the 4F-CRT techniques resulted in sharper of the dose-volume histograms (DVHs) for primary gross tumor volume (PGTVnx) and planning target volume (PTVnx), similar to the intensity modulated radiation therapy (IMRT). The median follow-up duration was 43 months...
December 31, 2016: Oncotarget
https://www.readbyqxmd.com/read/28052046/fast-approximate-delivery-of-fluence-maps-for-imrt-and-vmat
#14
Marleen Balvert, David L Craft
In this article we provide a method to generate the trade-off between delivery time and fluence map matching quality for dynamically delivered fluence maps. At the heart of our method lies a mathematical programming model that, for a given duration of delivery, optimizes leaf trajectories and dose rates such that the desired fluence map is reproduced as well as possible. We begin with the single fluence map case and then generalize the model and the solution technique to the delivery of sequential fluence maps...
January 4, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28048924/mo-b-brb-02-3d-dosimetry-in-the-clinic-imrt-technique-validation-in-sweden
#15
S Ceberg
: Full three-dimensional (3D) dosimetry using volumetric chemical dosimeters probed by 3D imaging systems has long been a promising technique for the radiation therapy clinic, since it provides a unique methodology for dose measurements in the volume irradiated using complex conformal delivery techniques such as IMRT and VMAT. To date true 3D dosimetry is still not widely practiced in the community; it has been confined to centres of specialized expertise especially for quality assurance or commissioning roles where other dosimetry techniques are difficult to implement...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048914/su-g-brc-02-a-novel-multi-criteria-optimization-approach-to-generate-deliverable-intensity-modulated-radiation-therapy-imrt-treatment-plans
#16
G Kirlik, W D'Souza, H Zhang
PURPOSE: To present a novel multi-criteria optimization (MCO) solution approach that generates treatment plans with deliverable apertures using column generation. METHODS: We demonstrate our method with 10 locally advanced head-and-neck cancer cases retrospectively. In our MCO formulation, we defined an objective function for each structure in the treatment volume. This resulted in 9 objective functions, including 3 distinct objectives for primary target volume, high-risk and low-risk target volumes, 5 objectives for each of the organs-at-risk (OARs) (two parotid glands, spinal cord, brain stem and oral cavity), and one for the non-target non-OAR normal tissue...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048897/su-f-j-156-the-feasibility-of-mr-only-imrt-planning-for-prostate-anatomy
#17
R Vaitheeswaran, K R Sivaramakrishnan, Prashant Kumar, Raja Gattamaneni, Girish Kumar
PURPOSE: For prostate anatomy, previous investigations have shown that simulated CT (sCT) generated from MR images can be used for accurate dose computation. In this study, we demonstrate the feasibility of MR-only IMRT planning for prostate case. METHODS: Regular CT (rCT) and MR images of the same patient were acquired for prostate anatomy. Regions-of-interest (ROIs) i.e. target and risk structures are delineated on the rCT. A simulated CT (sCT) is generated from the MR image using the method described by Schadewaldt N et al...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048896/su-f-t-03-radiobiological-evaluation-of-a-directional-brachytherapy-device-surgically-implanted-following-ebrt
#18
M J Rivard, J G Emrich, J Poli
PURPOSE: Preceding surgical implantation following external-beam radiotherapy (EBRT) delivery, a radiobiological evaluation was performed for a new LDR Pd-103 directional brachytherapy device (CivaSheet). As this was the first case with the device used in combination with EBRT, there was concern to determine the appropriate prescription dose. METHODS: The radiobiological model of Dale (1985, 1989) was used for a permanent LDR implant including radioactive decay...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048885/mo-d-brb-03-quality-assurance-of-sbrt
#19
J Roper
: Increased use of SBRT and hypofractionation in radiation oncology practice has posted a number of challenges to medical physicist, ranging from planning, image-guided patient setup and on-treatment monitoring, to quality assurance (QA) and dose delivery. This symposium is designed to provide current knowledge necessary for the safe and efficient implementation of SBRT in various linac platforms, including the emerging digital linacs equipped with high dose rate FFF beams. Issues related to 4D CT, PET and MRI simulations, 3D/4D CBCT guided patient setup, real-time image guidance during SBRT dose delivery using gated/un-gated VMAT/IMRT, and technical advancements in QA of SBRT (in particular, strategies dealing with high dose rate FFF beams) will be addressed...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048884/th-ef-204-02-small-field-radiation-therapy-physics-and-recent-recommendations-from-iaea-and-icru
#20
J Seuntjens
: Joanna E. Cygler, Jan Seuntjens, J. Daniel Bourland, M. Saiful Huq, Josep Puxeu Vaque, Daniel Zucca Aparicio, Tatiana Krylova, Yuri Kirpichev, Eric Ford, Caridad Borras Stereotactic Radiation Therapy (SRT) utilizes small static and dynamic (IMRT) fields, to successfully treat malignant and benign diseases using techniques such as Stereotactic Radiosurgery (SRS) and Stereotactic Body Radiation Therapy (SBRT). SRT is characterized by sharp dose gradients for individual fields and their resultant dose distributions...
June 2016: Medical Physics
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