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https://www.readbyqxmd.com/read/27904451/the-ratio-of-weight-loss-to-planning-target-volume-significantly-impacts-setup-errors-in-nasopharyngeal-cancer-patients-undergoing-helical-tomotherapy-with-daily-megavoltage-computed-tomography
#1
Wei-Hsien Hou, Chun-Wei Wang, Chiao-Ling Tsai, Feng-Ming Hsu, Jason Chia-Hsien Cheng
BACKGROUND: Changes in head and neck anatomy during radiation therapy (RT) produce setup uncertainties of nasopharyngeal cancer (NPC) irradiation. We retrospectively analyzed image guidance data to identify clinical predictors of setup errors. PATIENTS AND METHODS: The data of 217 NPC patients undergoing definitive RT on a helical tomotherapy (HT) unit were analyzed. Factors including tumor stage, body mass index, weight loss, and planning target volume (PTV) were assessed as predictors of daily megavoltage computed tomography (MVCT) setup displacements, which were automatically registered using software...
December 1, 2016: Radiology and Oncology
https://www.readbyqxmd.com/read/27881295/measuring-dose-from-radiotherapy-treatments-in-the-vicinity-of-a-cardiac-pacemaker
#2
Samuel C Peet, Rachael Wilks, Tanya Kairn, Scott B Crowe
This study investigated the dose absorbed by tissues surrounding artificial cardiac pacemakers during external beam radiotherapy procedures. The usefulness of out-of-field reference data, treatment planning systems, and skin dose measurements to estimate the dose in the vicinity of a pacemaker was also examined. Measurements were performed by installing a pacemaker onto an anthropomorphic phantom, and using radiochromic film and optically stimulated luminescence dosimeters to measure the dose in the vicinity of the device during the delivery of square fields and clinical treatment plans...
November 21, 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27815039/standardisation-of-target-volume-delineation-for-carotid-sparing-intensity-modulated-radiotherapy-in-early-glottis-cancer
#3
D M Gujral, M Long, J W G Roe, K J Harrington, C M Nutting
AIMS: Recently, carotid-sparing intensity-modulated radiotherapy (IMRT) for early laryngeal glottis (T1/T2N0M0) cancer has generated interest in the hope of avoiding long-term carotid toxicity, as well as concerns relating to geographical misses and long-term normal tissue toxicity. The aim of this review was to summarise the current literature on carotid-sparing IMRT for early glottis cancer, with particular focus on definitions of target volumes and the carotid arteries as organs at risk...
November 1, 2016: Clinical Oncology: a Journal of the Royal College of Radiologists
https://www.readbyqxmd.com/read/27765542/dosimetric-comparison-of-helical-tomotherapy-intensity-modulated-radiation-therapy-volumetric-modulated-arc-therapy-and-3-dimensional-conformal-therapy-for-the-treatment-of-t1n0-glottic-cancer
#4
Kemal Ekici, Eda K Pepele, Bahaddin Yaprak, Oztun Temelli, Aysun F Eraslan, Nadir Kucuk, Ayse Y Altınok, Pelin A Sut, Ozlem D Alpak, Cemil Colak, Alpaslan Mayadagli
Various radiotherapy planning methods for T1N0 laryngeal cancer have been proposed to decrease normal tissue toxicity. We compare helical tomotherapy (HT), linac-based intensity-modulated radiation therapy (IMRT), volumetric-modulated arc therapy (VMAT), and 3-D conformal radiotherapy (3D-CRT) techniques for T1N0 laryngeal cancer. Overall, 10 patients with T1N0 laryngeal cancer were selected and evaluated. Furthermore, 10 radiotherapy treatment plans have been created for all 10 patients, including HT, IMRT, VMAT, and 3D-CRT...
October 17, 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27764132/can-we-spare-the-pancreas-and-other-abdominal-organs-at-risk-a-comparison-of-conformal-radiotherapy-helical-tomotherapy-and-proton-beam-therapy-in-pediatric-irradiation
#5
Emmanuel Jouglar, Antoine Wagner, Grégory Delpon, Loïc Campion, Philippe Meingan, Valérie Bernier, Charlotte Demoor-Goldschmidt, Marc-André Mahé, Thomas Lacornerie, Stéphane Supiot
OBJECTIVES: Late abdominal irradiation toxicity during childhood included renal damage, hepatic toxicity and secondary diabetes mellitus. We compared the potential of conformal radiotherapy (CRT), helical tomotherapy (HT) and proton beam therapy (PBT) to spare the abdominal organs at risk (pancreas, kidneys and liver- OAR) in children undergoing abdominal irradiation. METHODS: We selected children with abdominal tumors who received more than 10 Gy to the abdomen...
2016: PloS One
https://www.readbyqxmd.com/read/27756536/in-phantom-assessment-of-superficial-doses-under-tomotherapy-irradiation
#6
Margherita Zani, Cinzia Talamonti, Marta Bucciolini, Marco Marinelli, Gianluca Verona-Rinati, Pierluigi Bonomo, Fabiola Paiar, Stefania Pallotta
PURPOSE: Aim of this work is the assessment of build-up and superficial doses of different clinical Head&Neck plans delivered with Helical TomoTherapy (HT) (Accuray, Sunnyvale, CA). Depth dose profiles and superficial dose points were measured in order to evaluate the Treatment Planning System (TPS) capability of an accurate dose modeling in regions of disequilibrium. Geometries and scattering conditions were investigated, similar to the ones generally encountered in clinical treatments...
October 15, 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27738080/a-retrospective-comparison-of-outcome-and-toxicity-of-preoperative-image-guided-intensity-modulated-radiotherapy-versus-conventional-pelvic-radiotherapy-for-locally-advanced-rectal-carcinoma
#7
Chun-Ming Huang, Ming-Yii Huang, Hsiang-Lin Tsai, Ching-Wen Huang, Cheng-Jen Ma, Chih-Hung Lin, Chih-Jen Huang, Jaw-Yuan Wang
The aim of the study was to compare clinical outcomes and toxicity between 3D conformal radiotherapy (3DCRT) and image-guided intensity-modulated radiotherapy (IG-IMRT) administered through helical tomotherapy in locally advanced rectal cancer (LARC) patients receiving preoperative chemoradiotherapy. We reviewed 144 patients with Stage II-III rectal cancer receiving preoperative fluoropyrimidine-based chemoradiotherapy followed by radical resection. Tumor responses following chemoradiotherapy were evaluated using the Dworak tumor regression grade (TRG)...
October 13, 2016: Journal of Radiation Research
https://www.readbyqxmd.com/read/27734106/magnetic-resonance-image-guided-brachytherapy-for-cervical-cancer-prognostic-factors-for-survival
#8
Yeon-Joo Kim, Joo-Young Kim, Youngkyong Kim, Young Kyung Lim, Jonghwi Jeong, Chiyoung Jeong, Meyoung Kim, Myong Cheol Lim, Sang-Soo Seo, Sang-Yoon Park
OBJECTIVE: The purpose of this work was to identify prognostic factors for survival after magnetic resonance image (MRI)-guided brachytherapy combined with external beam radiotherapy for cervical cancer. MATERIAL AND METHODS: External beam radiotherapy of 45-50.4 Gy was delivered by either three-dimensional conformal radiotherapy or helical tomotherapy. Patients also received high-dose-rate MRI-guided brachytherapy of 5 Gy in 6 fractions. RESULTS: We analyzed 128 patients with International Federation of Gynecology and Obstetrics stage IB-IVB cervical cancer who underwent MRI-guided brachytherapy...
October 12, 2016: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/27685137/comparison-of-automatic-image-registration-uncertainty-for-three-igrt-systems-using-a-male-pelvis-phantom
#9
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...
2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27685129/comprehensive-dosimetric-planning-comparison-for-early-stage-non-small-cell-lung-cancer-with-sabr-fixed-beam-imrt-versus-vmat-versus-tomotherapy
#10
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 deliver-ing intensity-modulated radiation therapy (IMRT) include fixed-beam and helical TomoTherapy (HT). This study aims to provide an extensive dosimetric compari-son 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...
2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27685103/surface-imaging-laser-positioning-or-volumetric-imaging-for-breast-cancer-with-nodal-involvement-treated-by-helical-tomotherapy
#11
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 8, 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27681766/fast-megavoltage-computed-tomography-a-rapid-imaging-method-for-total-body-or-marrow-irradiation-in-helical-tomotherapy
#12
Taiki Magome, Akihiro Haga, Yutaka Takahashi, Keiichi Nakagawa, Kathryn E Dusenbery, Susanta K Hui
PURPOSE: Megavoltage computed tomographic (MVCT) imaging has been widely used for the 3-dimensional (3-D) setup of patients treated with helical tomotherapy (HT). One drawback of MVCT is its very long imaging time, the result of slow couch speeds of approximately 1 mm/s, which can be difficult for the patient to tolerate. We sought to develop an MVCT imaging method allowing faster couch speeds and to assess its accuracy for image guidance for HT. METHODS AND MATERIALS: Three cadavers were scanned 4 times with couch speeds of 1, 2, 3, and 4 mm/s...
November 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27675969/a-phase-iii-randomized-control-trial-comparing-skin-sparing-helical-tomotherapy-versus-3d-conformal-radiation-therapy-in-early-stage-breast-cancer-acute-and-late-skin-toxicity-outcomes
#13
B S Abdulkarim, K Joseph, L Vos, H K Warkentin, Z Gabos, N Pervez, K Tankel, S Ghosh, S M J Chafe, M B Parliament
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27675827/intensity-modulated-radiation-therapy-by-tomotherapy-imrt-concurrent-with-a-short-systemic-treatment-for-solitary-plasmacytoma-of-the-bone-spb-with-improvement-of-progression-free-survival
#14
E Le Ray, L Belin, C Plancher, D Bouscary, Y M Kirova
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27675514/intensity-modulated-radiation-therapy-imrt-for-craniospinal-irradiation-csi-on-helical-tomotherapy-ht-effect-of-low-dose-bath-on-acute-hematologic-toxicity
#15
T Gupta, T P Telkhade, G Jain, K Joshi, S Kannan, G J Sastri, R Jalali
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27675403/comparison-of-treatment-plans-using-robotic-radiosurgery-with-fixed-cone-helical-tomotherapy-and-volumetric-modulated-arc-therapy-with-fff-beam-for-spine-stereotactic-body-radiation-therapy
#16
L Sang Kyu, J H Kim, M J Kim, J Y Woo, J G Baek, S Y Kim, J H Cho, J S Chang, W S Koom
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27675252/hemibody-irradiation-using-helical-tomotherapy-planning
#17
L B Berk, N A Mason, S Jacobs
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27675224/a-study-of-acute-genitourinary-and-gastrointestinal-toxicity-relationship-with-planning-index-in-prostate-cancer-treated-by-helical-tomotherapy
#18
S Lee, K H Kim, Y J Cao, J B Shim, K H Chang, J S Ko, S W Choi, S H Lee, C K Min, W S Yoon, D S Yang, Y J Park, C Y Kim
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27675219/using-a-3-dimensional-diode-array-system-for-synchronicity-test-in-helical-tomotherapy
#19
L Yu, B Yang, S X Sun, H X Wang, J Shen, K Hu, J Qiu, Q F Zhang
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27675187/bm3d-enhanced-mv-topogram-for-fast-and-accurate-patient-localization-on-tomotherapy
#20
L Yang, D Low, X Qi
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
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