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https://www.readbyqxmd.com/read/28444831/analysis-of-modulation-factor-to-shorten-the-delivery-time-in-helical-tomotherapy
#1
Hidetoshi Shimizu, Koji Sasaki, Hiroyuki Tachibana, Natsuo Tomita, Chiyoko Makita, Kuniyasu Nakashima, Kazushi Yokoi, Takashi Kubota, Manabu Yoshimoto, Tohru Iwata, Takeshi Kodaira
A low modulation factor (MF) maintaining a good dose distribution contributes to the shortening of the delivery time and efficiency of the treatment plan in helical tomotherapy. The purpose of this study was to reduce the delivery time using initial values and the upper limit values of MF. First, patients with head and neck cancer (293 cases) or prostate cancer (181 cases) treated between June 2011 and July 2015 were included in the analysis of MF values. The initial MF value (MFinitial ) was defined as the average MFactual value, and the upper limit of the MF value (MFUL ) was defined according the following equation: MFUL = 2 × standard deviation of MFactual value + the average MFactual Next, a treatment plan was designed for patients with head and neck cancer (62 cases) and prostate cancer (13 cases) treated between December 2015 and June 2016...
April 26, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28435647/helical-tomotherapy%C3%A2-is-a-safe-and-feasible-technique-for-total-scalp-irradiation
#2
Francesco Cuccia, Vanessa Figlia, Antonella Palmeri, Francesco Verderame, Antonio Lo Casto, Mariella Mannino, Giuseppe Ferrera
Angiosarcoma of the scalp is a rare aggressive tumor that affects elderly patients. Chemoradiation is the treatment of choice for multicentric and extensive disease. The shape of the scalp represents a dosimetric challenge in terms of achieving a homogeneous concave dose distribution with coverage of the entire target volume and an acceptable organs-at-risk sparing. We report a case of an 81-year-old man with a multifocal angiosarcoma of the scalp treated with Helical TomoTherapy® (Accuray Inc., Sunnyvale, CA, USA) intensity modulated radiotherapy...
March 24, 2017: Rare Tumors
https://www.readbyqxmd.com/read/28412923/fdg-pet-ct-predicts-outcome-in-oropharingeal-carcinoma-patients-undergoing-intensity-modulated-radiation-therapy-with-dose-escalation-to-fdg-avid-tumour-volumes
#3
Paola Mapelli, Sara Broggi, Elena Incerti, Pierpaolo Alongi, Margarita Kirienko, Claudio Fiorino, Italo Dell Oca, Federico Fallanca, Emilia Giovanna Vanoli, Nadia Gisella Di Muzio, Luigi Gianolli, Maria Picchio
PURPOSE: To evaluate the predictive value of FDG-PET/CT parameters on outcome of oropharyngeal squamocellular cancer (OSCC) patients undergoing helical tomotherapy (HTT), with dose escalation to FDG-PET/CT positive tumour volumes using the simultaneous integrated boost (SIB) technique. MATERIALS AND METHODS: We analysed 41 patients studied by FDG-PET/CT and treated with radical intent between 2005 and 2014 for OSCC. HTT-SIB was delivered in 30 fractions concomitantly: 69 Gy, as SIB, to the PET-positive volume (biological target volume - BTV-PET), both to the primary tumour (T) and lymph nodes (N), 66 Gy to the T and positive N, 54 Gy to the laterocervical nodes at risk...
April 13, 2017: Current Radiopharmaceuticals
https://www.readbyqxmd.com/read/28410684/knowledge-based-treatment-planning-an-inter-technique-and-inter-system-feasibility-study-for-prostate-cancer
#4
Elisabetta Cagni, Andrea Botti, Renato Micera, Maria Galeandro, Roberto Sghedoni, Matteo Orlandi, Cinzia Iotti, Luca Cozzi, Mauro Iori
PURPOSE: Helical Tomotherapy (HT) plans were used to create two RapidPlan knowledge-based (KB) models to generate plans with different techniques and to guide the optimization in a different treatment planning system for prostate plans. Feasibility and performance of these models were evaluated. MATERIAL AND METHODS: two sets of 35 low risk (LR) and 30 intermediate risk (IR) prostate cancer cases who underwent HT treatments were selected to train RapidPlan models...
April 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28398210/out-of-field-doses-from-pediatric-craniospinal-irradiations-using-3d-crt-imrt-helical-tomotherapy-and-electron-based-therapy
#5
Marijke De Saint-Hubert, Dirk Verellen, Kenneth Poels, Wouter Crijns, Federica Magliona, Tom Depuydt, Filip Vanhavere, Lara Struelens
Medulloblastoma treatment involves irradiation of the entire central nervous system, i.e craniospinal irradiation (CSI). This is associated with significant exposure of large volumes of healthy tissue with a growing concern regarding treatment associated side effects. The current study compares out-of-field organ doses in children receiving CSI with three-dimensional-conformal radiotherapy (3D-CRT), intensity modulated radiotherapy (IMRT), helical tomotherapy (HT) and an electron-based technique, including as well radiation doses resulting from imaging performed during treatment...
April 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28357632/radiotherapy-for-adrenal-gland-metastases-from-hepatocellular-carcinoma
#6
B-Y Yuan, Y Hu, L Zhang, Y-H Chen, Y-Y Dong, Z-C Zeng
BACKGROUND: Several studies have found benefits of radiotherapy for adrenal metastasis from hepatocellular carcinoma (HCC). However, the efficacy, safety and outcome issues have not yet been fully addressed. Therefore, we performed this study to further elucidate the feasibility and outcome of radiotherapy in treating adrenal metastasis from HCC. METHODS: We retrospectively analyzed 81 patients with adrenal metastasis from HCC between 2001 and 2015. Eighteen patients received helical tomotherapy and 63 patients received conventional radiotherapy, including two-dimensional (2-D) or three-dimensional conformal radiotherapy (3-D CRT)...
March 29, 2017: Clinical & Translational Oncology
https://www.readbyqxmd.com/read/28339844/intensity-modulated-radiotherapy-using-two-static-ports-of-tomotherapy-for-breast-cancer-after-conservative-surgery-dosimetric-comparison-with-other-treatment-methods-and-3-year-clinical-results
#7
Aiko Nagai, Yuta Shibamoto, Masanori Yoshida, Koji Inoda, Yuzo Kikuchi
This study investigated the differences in dose-volume parameters for the breast and normal tissues during TomoDirectTM (TD) intensity-modulated radiation therapy (IMRT), TD-3D conformal radiotherapy (3DCRT) and 3DCRT plans, all using two beams, and analyzed treatment outcomes of two-beam TD-IMRT for breast cancer after breast-conserving surgery. Between August 2011 and January 2015, 152 patients were treated using two-beam TD-IMRT with 50 Gy/25 fractions. Among them, 20 patients with left-sided breast cancer were randomly chosen, and two-beam TD-IMRT, TD-3DCRT and 3DCRT plans were created for each patient...
February 23, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28338869/measurement-of-absorption-dose-outside-irradiation-field-in-imrt
#8
Makoto Hirata, Hajime Monzen, Kohei Hanaoka, Yasumasa Nishimura
The absorption dose outside the irradiation field for prostate intensity-modulated radiation therapy was measured and evaluated by comparison with calculated values of radiation treatment planning system (TPS). The values of TPS calculated were using Varian CLINAC21EX/Eclipse and TomoTherapy Planning System for constant irradiation time. The absorption dose was measured by placing a glass-element dosemeter in a human-bone enclosure phantom with a planning target volume inside the irradiation field. The organs at risk were the rectum, spinal cord, thyroid, eyeball and the left lung...
March 3, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28335778/radiation-dose-escalation-based-on-fdg-pet-driven-dose-painting-by-numbers-in-oropharyngeal-squamous-cell-carcinoma-a-dosimetric-comparison-between-tomotherapy-ha-and-rapidarc
#9
Sarah Differding, Edmond Sterpin, Nicolas Hermand, Bianca Vanstraelen, Sandra Nuyts, Nathalie de Patoul, Jean-Marc Denis, John Aldo Lee, Vincent Grégoire
PURPOSE: Validation of dose escalation through FDG-PET dose painting (DP) for oropharyngeal squamous cell carcinoma (SCC) requires randomized clinical trials with large sample size, potentially involving different treatment planning and delivery systems. As a first step of a joint clinical study of DP, a planning comparison was performed between Tomotherapy HiArt® (HT) and Varian RapidArc® (RA). METHODS: The planning study was conducted on five patients with oropharyngeal SCC...
March 23, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28318880/highly-conformal-craniospinal-radiotherapy-techniques-can-underdose-the-cranial-clinical-target-volume-if-leptomeningeal-extension-through-skull-base-exit-foramina-is-not-contoured
#10
D J Noble, T Ajithkumar, J Lambert, I Gleeson, M V Williams, S J Jefferies
AIMS: Craniospinal irradiation (CSI) remains a crucial treatment for patients with medulloblastoma. There is uncertainty about how to manage meningeal surfaces and cerebrospinal fluid (CSF) that follows cranial nerves exiting skull base foramina. The purpose of this study was to assess plan quality and dose coverage of posterior cranial fossa foramina with both photon and proton therapy. MATERIALS AND METHODS: We analysed the radiotherapy plans of seven patients treated with CSI for medulloblastoma and primitive neuro-ectodermal tumours and three with ependymoma (total n = 10)...
March 15, 2017: Clinical Oncology: a Journal of the Royal College of Radiologists
https://www.readbyqxmd.com/read/28314468/constraints-for-symptomatic-radiation-pneumonitis-of-helical-tomotherapy-hypofractionated-simultaneous-multitarget-radiotherapy-for-pulmonary-metastasis-from-hepatocellular-carcinoma
#11
Genlai Lin, Han Xiao, Zhaochong Zeng, Zhiyong Xu, Jian He, Taiwei Sun, Jin Liu, Genwu Guo, Weixing Ji, Yong Hu
BACKGROUND AND PURPOSE: This study was aimed to identify the clinical and dosimetric parameters that predict symptomatic radiation pneumonitis (SRP, radiation pneumonitis≥2 grade) in patients with pulmonary metastasis from hepatocellular carcinoma (HCC) after helical tomotherapy (HT) hypofractionated simultaneous multitarget radiotherapy. MATERIALS AND METHODS: 62 patients with 407 pulmonary metastases from HCC were consecutively treated with HT. The median radiation dose was a 49...
March 14, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28300382/implementation-of-tomoedge-in-the-independent-dose-calculator-checktomo
#12
Mathieu Schopfer, Simon J Thomas, G Samuel J Tudor, Jean Bourhis, François Bochud, Raphaël Moeckli
PURPOSE: CheckTomo is an independent dose calculation software for tomotherapy. Recently, Accuray (Accuray Inc., Sunnyvale, CA, USA) released an upgrade of its tomotherapy treatment device, called TomoEDGE Dynamic Jaws, which improves the quality of treatment plans by enhancing the dose delivery with the help of jaws motion. This study describes the upgrade of CheckTomo to that new feature. METHODS: To account for the varying width and off-axis shift of dynamic jaws fields, the calculation engine of CheckTomo multiplies the treatment field profile by a penumbral filter and shifts the dose calculation grid...
March 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297444/surface-imaging-laser-positioning-or-volumetric-imaging-for-breast-cancer-with-nodal-involvement-treated-by-helical-tomotherapy
#13
Frederik Crop, David Pasquier, Amandine Baczkiewic, Julie Doré, Lena Bequet, Emeline Steux, Anne Gadroy, Jacqueline Bouillon, Clement Florence, Laurence Muszynski, Mathilde Lacour, Eric Lartigau
A surface imaging system, Catalyst (C-Rad), was compared with laser-based positioning and daily mega voltage computed tomography (MVCT) setup for breast patients with nodal involvement treated by helical TomoTherapy. Catalyst-based positioning performed better than laser-based positioning. The respective modalities resulted in a standard deviation (SD), 68% confidence interval (CI) of positioning of left-right, craniocaudal, anterior-posterior, roll: 2.4 mm, 2.7 mm, 2.4 mm, 0.9° for Catalyst positioning, and 6...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297443/comparison-of-automatic-image-registration-uncertainty-for-three-igrt-systems-using-a-male-pelvis-phantom
#14
Jeffrey Barber, Jonathan R Sykes, Lois Holloway, David I Thwaites
A series of phantom images using the CIRS Virtual Human Male Pelvis was acquired across available dose ranges for three image-guided radiotherapy (IGRT) imaging systems: Elekta XVI CBCT, Varian TrueBeam CBCT, and TomoTherapy MV CT. Each image was registered to a fan-beam CT within the XVI software 100 times with random initial offsets. The residual registration error was analyzed to assess the role of imaging hardware and reconstruction in the uncertainty of the IGRT process. Residual translation errors were similar for all systems and <0...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297441/comprehensive-dosimetric-planning-comparison-for-early-stage-non-small-cell-lung-cancer-with-sabr-fixed-beam-imrt-versus-vmat-versus-tomotherapy
#15
Ilma Xhaferllari, Omar El-Sherif, Stewart Gaede
Volumetric-modulated arc therapy (VMAT) is emerging as a leading technology in treating early-stage, non-small cell lung cancer (NSCLC) with stereotactic ablative radiotherapy (SABR). However, two other modalities capable of delivering intensity-modulated radiation therapy (IMRT) include fixed-beam and helical TomoTherapy (HT). This study aims to provide an extensive dosimetric comparison among these various IMRT techniques for treating early-stage NSCLC with SABR. Ten early-stage NSCLC patients were retrospectively optimized using three fixed-beam techniques via nine to eleven beams (high and low modulation step-and-shoot (SS), and sliding window (SW)), two VMAT techniques via two partial arcs (SmartArc (SA) and RapidArc (RA)), and three HT techniques via three different fan beam widths (1 cm, 2...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28296298/performance-evaluation-of-the-ritg148-set-of-tomotherapy-quality-assurance-tools-using-rtqa-2-radiochromic-film
#16
Eric C Lobb
Version 6.3 of the RITG148+ software package offers eight automated analysis routines for quality assurance of the TomoTherapy platform. A performance evaluation of each routine was performed in order to compare RITG148+ results with traditionally accepted analysis techniques and verify that simulated changes in machine parameters are correctly identified by the software. Reference films were exposed according to AAPM TG-148 methodology for each routine and the RITG148+ results were compared with either alternative software analysis techniques or manual analysis techniques in order to assess baseline agreement...
July 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28291935/helical-tomotherapy-to-linac-plan-conversion-utilizing-raystation-fallback-planning
#17
Xin Zhang, Jose Penagaricano, Ganesh Narayanasamy, Peter Corry, TianXiao Liu, Maraboyina Sanjay, Nava Paudel, Steven Morrill
RaySearch RayStation Fallback (FB) planning module can generate an equivalent backup radiotherapy treatment plan facilitating treatment on other linear accelerators. FB plans were generated from the RayStation FB module by simulating the original plan target and organ at risk (OAR) dose distribution and delivered in various backup linear accelerators. In this study, helical tomotherapy (HT) backup plans used in Varian TrueBeam linear accelerator were generated with the RayStation FB module. About 30 patients, 10 with lung cancer, 10 with head and neck (HN) cancer, and 10 with prostate cancer, who were treated with HT, were included in this study...
January 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28291927/single-fraction-radiosurgery-stereotactic-body-radiation-therapy-sbrt-for-spine-metastasis-a-dosimetric-comparison-of-multiple-delivery-platforms
#18
Adrian Nalichowski, Isaac Kaufman, John Gallo, Todd Bossenberger, Tim Solberg, Ezequiel Ramirez, Yulong Yan, Julie Fredrick, Tewfik Bichay, Alan Mayville, Jay Burmeister
There are numerous commercial radiotherapy systems capable of delivering single fraction spine radiosurgery/SBRT. We aim to compare the capabilities of several of these systems to deliver this treatment when following standardized criteria from a national protocol. Four distinct target lesions representing various case presentations of spine metastases were contoured in both the thoracic and lumbar spine of an anthropomorphic SBRT phantom. Single fraction radiosurgery/SBRT plans were designed for each target with each of our treatment platforms...
January 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28274405/state-of-dose-prescription-and-compliance-to-international-standard-icru-83-in-intensity-modulated-radiation-therapy-among-academic-institutions
#19
MULTICENTER STUDY
Indra J Das, Aaron Andersen, Zhe Jay Chen, Andrea Dimofte, Eli Glatstein, Jeremy Hoisak, Long Huang, Mark P Langer, Choonik Lee, Matthew Pacella, Richard A Popple, Roger Rice, Jennifer Smilowitz, Patricia Sponseller, Timothy Zhu
PURPOSE: The purpose of this study was to evaluate dose prescription and recording compliance to international standard (International Commission on Radiation Units & Measurements [ICRU]-83) in patients treated with intensity modulated radiation therapy (IMRT) among academic institutions. METHODS AND MATERIALS: Ten institutions participated in this study to collect IMRT data to evaluate compliance to ICRU-83. Under institutional review board clearance, data from 5094 patients-including treatment site, technique, planner, physician, prescribed dose, target volume, monitor units, planning system, and dose calculation algorithm-were collected anonymously...
March 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28270323/toxicity-and-early-clinical-outcomes-in-cervical-cancer-following-extended-field-helical-tomotherapy-to-para-aortic-lymph-nodes
#20
MULTICENTER STUDY
E Jouglar, L Thomas, A de la Rochefordière, G Noël, M Le Blanc-Onfroy, G Delpon, L Campion, M-A Mahé
PURPOSE: To evaluate toxicity and early disease outcome among patients treated for cervical cancer with extended-field helical tomotherapy to the para-aortic nodes. PATIENTS AND METHODS: Thirty-eight patients (International Federation of Gynecology and Obstetrics [FIGO] stage IB2-IVA) from four institutions received extended-field helical tomotherapy and were retrospectively evaluated. All had nodal disease. Para-aortic lymph nodes were involved in 31 patients. Patients were assessed for toxicity using version 4 of the National Cancer Institute's common terminology criteria for adverse events...
December 2016: Cancer Radiothérapie: Journal de la Société Française de Radiothérapie Oncologique
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