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https://www.readbyqxmd.com/read/29031915/experimental-and-monte-carlo-based-determination-of-the-beam-quality-specifier-for-tomotherapyhd-treatment-units
#1
S Howitz, M Schwedas, T Wiezorek, K Zink
Reference dosimetry by means of clinical linear accelerators in high-energy photon fields requires the determination of the beam quality specifier TPR20,10, which characterizes the relative particle flux density of the photon beam. The measurement of TPR20,10 has to be performed in homogenous photon beams of size 10×10cm(2) with a focus-detector distance of 100cm. These requirements cannot be fulfilled by TomoTherapy treatment units from Accuray. The TomoTherapy unit provides a flattening-filter-free photon fan beam with a maximum field width of 40cm and field lengths of 1...
October 11, 2017: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/29023527/dose-escalated-radiotherapy-for-unresectable-or-locally-recurrent-pancreatic-cancer-dose-volume-analysis-toxicity-and-outcome-of-28-consecutive-patients
#2
Sebastian Zschaeck, Bibiana Blümke, Peter Wust, David Kaul, Marcus Bahra, Hanno Riess, Fritz Klein, Marianne Sinn, Uwe Pelzer, Volker Budach, Pirus Ghadjar
PURPOSE: The role of radiotherapy for unresectable pancreatic cancer is controversial. A benefit of additional radiotherapy is supported by some observations. A dose-effect relationship was recently found by dose escalation employing image guided and intensity modulated radiotherapy. METHODS: We retrospectively evaluated 28 consecutive patients, all with history of extensive prior therapies for unresectable locally advanced/ recurrent pancreatic cancer (LAPC/LRPC)...
2017: PloS One
https://www.readbyqxmd.com/read/28982908/long-term-tumor-control-and-late-toxicity-in-patients-with-prostate-cancer-receiving-hypofractionated-2-2-gy-soft-tissue-matched-image-guided-intensity-modulated-radiotherapy
#3
Daisuke Shimizu, Hideya Yamazaki, Takuya Nishimura, Norihiro Aibe, Haruumi Okabe
AIM: We report the long-term tumor control and toxicity outcomes of patients undergoing hypofractionated (2.2 Gy) image-guided intensity-modulated radiotherapy (IG-IMRT) using tomotherapy for clinically localized prostate cancer. PATIENTS AND METHODS: We examined the cases of 138 consecutive patients with stage T1-T3 prostate cancer that were treated with IG-IMRT from June 2007 to July 2009. The median follow-up time was 79 months (range=31-96 months). The planning target volume received a dose of 72...
October 2017: Anticancer Research
https://www.readbyqxmd.com/read/28982897/interfractional-rectal-displacement-requiring-repeated-precaution-did-not-correlate-to-biochemical-control-and-rectal-toxicity-in-patients-with-prostate-cancer-treated-with-image-guided-intensity-modulated-radiation-therapy
#4
Kazuki Iwama, Hideya Yamazaki, Daisuke Shimizu, Gen Suzuki, Satoaki Nakamura, Naomi Sasaki, Tadashi Takeneka, Haruumi Okabe, Tatsuyuki Nishikawa, Ken Yoshida
AIM: To investigate the correlation between frequency of action level of interfractional rectal displacement requiring repeated precaution in patients with prostate cancer and late toxicity from image-guided intensity-modulated radiation therapy (IG-IMRT) using helical tomotherapy. PATIENTS AND METHODS: We examined 264 patients who underwent IG-IMRT during 2007-2011. Megavoltage computed tomographic (MVCT) images were acquired before radiation therapy and was examined with soft-tissue matching by comparing treatment planning images within 9,345 fractions...
October 2017: Anticancer Research
https://www.readbyqxmd.com/read/28974863/a-feasibility-study-on-the-use-of-tomotherapy-megavoltage-computed-tomography-images-for-palliative-patient-treatment-planning
#5
Yunfei Hu, Mikel Byrne, Ben Archibald-Heeren, Matthew Squires, Amy Teh, Kylie Seiffert, Sonja Cheers, Yang Wang
Dedicated rapid access palliative radiation therapy improves patients' access to care, allowing more timely treatment which would positively impact on quality of life. The TomoTherapy (Accuray, Sunnyvale, CA) system provides megavoltage (MV) fan-beam computed tomography (FBCT) as the image guidance technique, and a module called "statRT" that allows the use of these MV FBCT images for direct planning. The possibility of using this imaging modality for palliative radiotherapy treatment planning is assessed against accepted planning CT standards by performing tests following AAPM TG 66 and an end-to-end measurement...
July 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28974862/performance-characteristics-of-an-independent-dose-verification-program-for-helical-tomotherapy
#6
Isaac C F Chang, Jeff Chen, Slav Yartsev
Helical tomotherapy with its advanced method of intensity-modulated radiation therapy delivery has been used clinically for over 20 years. The standard delivery quality assurance procedure to measure the accuracy of delivered radiation dose from each treatment plan to a phantom is time-consuming. RadCalc(®), a radiotherapy dose verification software, has released specifically for beta testing a module for tomotherapy plan dose calculations. RadCalc(®)'s accuracy for tomotherapy dose calculations was evaluated through examination of point doses in ten lung and ten prostate clinical plans...
July 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28974860/the-impact-of-the-grid-size-on-tomotherapy-for-prostate-cancer
#7
Motohiro Kawashima, Hidemasa Kawamura, Masahiro Onishi, Yosuke Takakusagi, Noriyuki Okonogi, Atsushi Okazaki, Tetsuo Sekihara, Yoshitaka Ando, Takashi Nakano
Discretization errors due to the digitization of computed tomography images and the calculation grid are a significant issue in radiation therapy. Such errors have been quantitatively reported for a fixed multifield intensity-modulated radiation therapy using traditional linear accelerators. The aim of this study is to quantify the influence of the calculation grid size on the dose distribution in TomoTherapy. This study used ten treatment plans for prostate cancer. The final dose calculation was performed with "fine" (2...
July 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28959172/the-outcome-of-the-first-100-nasopharyngeal-cancer-patients-in-thailand-treated-by-helical-tomotherapy
#8
Imjai Chitapanarux, Wannapha Nobnop, Patumrat Sripan, Ausareeya Chumachote, Ekkasit Tharavichitkul, Somvilai Chakrabandhu, Pitchayaponne Klunklin, Wimrak Onchan, Bongkot Jia-Mahasap, Suwapim Janlaor, Patcharawadee Kayan, Patrinee Traisathit, Dirk Van Gestel
BACKGROUND: The aim of the study was to analyse of two-year loco-regional failure free survival (LRFFS), distant metastasis free survival (DMFS), overall survival (OS), and toxicity outcomes of the first 100 nasopharyngeal carcinoma patients in Thailand treated by helical tomotherapy. PATIENTS AND METHODS: Between March 2012 and December 2015, 100 patients with non-metastatic nasopharyngeal carcinoma were treated by helical tomotherapy. All patients were treated by platinum-based concurrent chemoradiotherapy and adjuvant or neo-adjuvant chemotherapy...
September 2017: Radiology and Oncology
https://www.readbyqxmd.com/read/28948117/management-of-nasal-septum-chondrosarcoma-occurring-in-elderly-a-case-report
#9
Liliana Belgioia, Elena M Vaccara, Almalina Bacigalupo, Renzo Corvò
Chondrosarcomas (CS) are tumors affecting mainly pelvis, long bones and ribs in middle aged people; involvement of head and neck is rare and nasal septum location is exceptional. We report the follow-up of an 85-year-old patient suffering from head and neck CS. Magnetic resonance imaging (MRI) showed a mass originating from nasal septum. The patient underwent to debulking surgery and adjuvant hypofractionated radiotherapy with excellent tolerability and no evidence of recurrence after 16 months. Hypofractionated radiotherapy delivered with advanced technique (helical tomotherapy) allowed to deliver high doses radiation in elderly patients with limited toxicity...
July 20, 2017: Curēus
https://www.readbyqxmd.com/read/28944110/secondary-cutaneous-involvement-in-follicular-diffuse-lymphoma-treated-with-helical-tomotherapy
#10
A Rashid Dar, Kevin Jordan, Slav Yartsev
Non-Hodgkin's lymphoma is a complex heterogeneous group of disease entities that involves nodal and extranodal tissues. Cutaneous involvement can occur either as a primary or secondary in course of disease. Radiation therapy with either total body or localized treatments is often used for local control and symptom relief, depending on the target volume. We describe a 60-year-old male with a remote history of stage IA left neck follicular lymphoma treated with radiation 20 years ago and previous relapses aggressively treated by chemotherapy...
July 14, 2017: Curēus
https://www.readbyqxmd.com/read/28938697/intensity-modulated-radiotherapy-for-hepatocellular-carcinoma-dosimetric-and-clinical-results
#11
REVIEW
Sun Hyun Bae, Won Il Jang, Hee Chul Park
Since the introduction of 3-dimensional conformal radiotherapy (3DCRT), new radiotherapy techniques have expanded the indication of radiotherapy for the treatment of hepatocellular carcinoma (HCC), from the hitherto palliative to a now curative-intent purpose. Intensity-modulated radiotherapy (IMRT), currently the most advanced radiotherapy technique, is considered an attractive option for the treatment of HCC, and is more widely applied because it can deliver a higher dose to the tumor than 3DCRT while sparing surrounding normal organs...
August 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/28936374/helical-tomotherapy-for-postmastectomy-radiotherapy-after-immediate-left-breast-reconstruction-a-case-study
#12
Dominique Mathieu, Nazanin Shahvary, Nicolas Côté, Kerianne Boulva, Léamarie Meloche-Dumas, Toni Vu, Erica Patocskai, Christina Bernier, David Roberge, Israel Fortin
A 43-year-old premenopausal female presented with a multicentric infiltrating lobular carcinoma of the left breast with axillary nodes metastasis. She underwent modified radical mastectomy with axillary lymph node dissection (level I and II) followed by a mixed autologous latissimus dorsi flap reconstruction with the addition of prosthesis. The final pathological analysis revealed a 6 cm invasive lobular carcinoma pT3N2aM0, grade III/III, estrogen and progesterone positive, human epidermal growth factor receptor 2 (HER2) negative, with 5/16 positive lymph nodes...
July 12, 2017: Curēus
https://www.readbyqxmd.com/read/28935854/comparison-of-helical-tomotherapy-and-direct-tomotherapy-in-bilateral-whole-breast-irradiation-in-a-case-of-bilateral-synchronous-grade-1-and-stage-1-breast-cancer
#13
Valentina Lancellotta, Martina Iacco, Elisabetta Perrucci, Claudio Zucchetti, Anna Concetta Dipilato, Lorenzo Falcinelli, Isabella Palumbo, Cynthia Aristei
BACKGROUND Synchronous bilateral breast cancer is rare. A case is presented where whole breast irradiation (WBI) was planned after breast conserving surgery in a patient with synchronous bilateral breast cancer. A comparison was made between the feasibility of helical tomotherapy and direct tomotherapy. CASE REPORT A 60-year-old woman was found to have bilateral breast nodules on routine mammographic screening, resulting in bilateral lumpectomy and sentinel lymph node biopsy. Histopathology showed a 6 mm diameter invasive ductal carcinoma in the right breast (Grade 1, hormone receptor positive, HER2 negative) and an 8mm diameter tubular carcinoma in the left breast (Grade 1, hormone receptor positive, HER2 negative)...
September 22, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28933270/11c-choline-pet-ct-based-helical-tomotherapy-as-treatment-approach-for-bone-metastases-in-recurrent-prostate-cancer-patients
#14
Elena Incerti, Vincenzo Gangemi, Paola Mapelli, Chiara Lucrezia Deantoni, Giampiero Giovacchini, Federico Fallanca, Andrei Fodor, Andrea Ciarmiello, Sergio Baldari, Luigi Gianolli, Nadia Di Muzio, Maria Picchio
To evaluate the efficacy of 11C-choline PET/CT (CHO-PET/CT) based helical tomotherapy (HTT) as a therapeutic approach for bone metastases in recurrent prostate cancer (PCa) patients. METHODS This retrospective study includes 20 PCa patients (median age: 67; range: 51-80 years) presenting biochemical relapse after primary treatment who underwent CHO-PET/CT based HTT on positive bone metastases from December 2007 to June 2014. The effectiveness of HTT assessed with biochemical response at 3/6/12 months, biochemical relapse free survival (bRFS) and overall survival (OS) at 2 years...
September 19, 2017: Current Radiopharmaceuticals
https://www.readbyqxmd.com/read/28915893/dosimetric-comparison-of-different-treatment-modalities-for-stereotactic-radiotherapy
#15
Shih-Ming Hsu, Yuan-Chun Lai, Chien-Chung Jeng, Chia-Ying Tseng
BACKGROUND: The modalities for performing stereotactic radiotherapy (SRT) on the brain include the cone-based linear accelerator (linac), the flattening filter-free (FFF) volumetric modulated arc therapy (VMAT) linac, and tomotherapy. In this study, the cone-based linac, FFF-VMAT linac, and tomotherapy modalities were evaluated by measuring the differences in doses delivered during brain SRT and experimentally assessing the accuracy of the output radiation doses through clinical measurements...
September 16, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28887665/impact-of-radiation-technique-radiation-fraction-dose-and-total-cisplatin-dose-on-hearing-retrospective-analysis-of-29%C3%A2-medulloblastoma-patients
#16
Sergiu Scobioala, Ross Parfitt, Peter Matulat, Christopher Kittel, Fatemeh Ebrahimi, Heidi Wolters, Antoinette Am Zehnhoff-Dinnesen, Hans Theodor Eich
PURPOSE: To analyze the incidence and degree of sensorineural hearing loss (SNHL) resulting from different radiation techniques, fractionation dose, mean cochlear radiation dose (Dmean), and total cisplatin dose. MATERIAL AND METHODS: In all, 29 children with medulloblastoma (58 ears) with subclinical pretreatment hearing thresholds participated. Radiotherapy (RT) and cisplatin had been applied sequentially according to the HIT MED Guidance. Audiological outcomes up to the latest follow-up (median 2...
September 8, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28881160/effective-treatment-of-aggressive-fibromatosis-with-celecoxib-guided-by-genetic-testing
#17
Shanshan Yang, Xufu Wang, Haiping Jiang, Yongjie Wang, Zhuokun Li, Haijun Lu
Aggressive fibromatosis (AF) or desmoid tumors is an aggressive fibroblastic proliferation which is locally invasive but can not metastasize. The treatment of AF is challenging. Surgery was the main treatment modality for AF in the past, other strategies including radiotherapy, systemic therapies and wait-and-see policy. The use of non-steroidal anti-inflammatory drugs (NSAIDs) and targeted therapies has demonstrated good results. In the case report, a 39-year-old man presented with progressive chest wall pain...
September 7, 2017: Cancer Biology & Therapy
https://www.readbyqxmd.com/read/28864403/clinical-outcomes-of-several-imrt-techniques-for-patients-with-head-and-neck-cancer-a-propensity-score-weighted-analysis
#18
Jean-Emmanuel Bibault, Sophie Dussart, Pascal Pommier, Magali Morelle, Marius Huguet, Pierre Boisselier, Bernard Coche-Dequeant, Marc Alfonsi, Etienne Bardet, Michel Rives, Valentin Calugaru, Enrique Chajon, Georges Noel, Hinda Mecellem, Stephanie Servagi Vernat, Lionel Perrier, Philippe Giraud
PURPOSE: The Advanced Radiotherapy Oto-Rhino-Laryngologie (ART-ORL) study (NCT02024035) was performed to prospectively evaluate the clinical and economic aspects of helical TomoTherapy and volumetric modulated arc therapy (RapidArc, Varian Medical Systems, Palo Alto, CA) for patients with head and neck cancer. METHODS AND MATERIALS: Fourteen centers participated in this prospective comparative study. Randomization was not possible based on the availability of equipment...
June 27, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28855852/influence-of-optimizing-protocol-choice-on-the-integral-dose-value-in-prostate-radiotherapy-planning-by-dynamic-techniques-pilot-study
#19
Anna Zaleska, Krzysztof Bogaczyk, Tomasz Piotrowski
AIM: The purpose of this study was to compare the values of integral dose, calculated for treatment plans of dynamic radiotherapy techniques prepared with two different optimization protocols. BACKGROUND: Delivering radiation by IMRT, VMAT and also HT techniques has an influence on the low dose deposition of large areas of the patient body. Delivery of low dose can induce injury of healthy cells. In this situation, a good solution would be to reduce the area, which receives a low dose, but with appropriate dose level for the target volume...
September 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/28851315/propensity-score-matching-analysis-of-a-phase-ii-study-on-simultaneous-modulated-accelerated-radiation-therapy-using-helical-tomotherapy-for-nasopharyngeal-carcinomas
#20
Lei Du, Xin-Xin Zhang, Lin-Chun Feng, Bao-Lin Qu, Jing Chen, Jun Yang, Hai-Xia Liu, Shou-Ping Xu, Chuan-Bin Xie, Lin Ma
BACKGROUND: Using propensity score matching method (PSM) to evaluate the feasibility and clinical outcomes of simultaneous modulated accelerated radiation therapy (SMART) using helical tomotherapy (HT) in patients with nasopharyngeal carcinoma (NPC). METHODS: Between August 2007 and January 2016, 381 newly diagnosed NPC patients using HT were enrolled in pre-PSM cohort, including 161 cases in a prospective phase II study (P67.5 study, with a prescription dose of 67...
August 29, 2017: BMC Cancer
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