keyword
MENU ▼
Read by QxMD icon Read
search

Vmat

keyword
https://www.readbyqxmd.com/read/29322827/hypofractionated-volumetric-modulated-arc-therapy-in-ductal-carcinoma-in-situ-toxicity-and-cosmetic-outcome-from-a-prospective-series
#1
Fiorenza De Rose, Antonella Fogliata, Davide Franceschini, Cristina Iftode, Rosalba Torrisi, Giovanna Masci, Andrea Sagona, Corrado Tinterri, Alberto Testori, Wolfgang Gatzemeier, Bethania Fernandes, Daoud Rahal, Luca Cozzi, Armando Santoro, Marta Scorsetti
OBJECTIVE: Hypofractionated radiotherapy in early stage breast cancer is an effective adjuvant treatment, but there is a lack of randomized data for patients with ductal carcinoma in situ (DCIS). Aim of this study is the evaluation of skin toxicity and cosmesis, and early clinical outcome of DCIS patients enrolled in an institutional phase II trial of hypofractionated breast irradiation. METHODS: One hundred thirty-seven DCIS patients were enrolled in the trial...
January 11, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29322625/variations-in-dosimetric-distribution-and-plan-complexity-with-collimator-angles-in-hypofractionated-volumetric-arc-radiotherapy-for-treating-prostate-cancer
#2
Ming-Hsien Li, Sheng-Fang Huang, Chih-Chieh Chang, Jang-Chun Lin, Jo-Ting Tsai
PURPOSE: Hypofractionated radiotherapy can reduce treatment durations and produce effects identical to those of conventionally fractionated radiotherapy for treating prostate cancer. Volumetric arc radiotherapy (VMAT) can decrease the treatment machine monitor units (MUs). Previous studies have shown that VMAT with multileaf collimator (MLC) rotation exhibits better target dose distribution. Thus, VMAT with MLC rotation warrants further investigation. METHODS AND MATERIALS: Ten patients with prostate cancer were included in this study...
January 11, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29315174/oligorecurrent-nodal-prostate-cancer-long-term-results-of-an-elective-nodal-irradiation-approach
#3
Sebastien Tran, Sandra Jorcano, Teresa Falco, Giorgio Lamanna, Raymond Miralbell, Thomas Zilli
OBJECTIVES: The objective of this study was to report long-term results of elective nodal radiotherapy (ENRT) in prostate cancer (PCa) patients with oligorecurrent nodal disease after primary treatment. METHODS: Data of 53 oligorecurrent PCa patients (N1 and/or M1a) with ≤5 nodal metastases (n=108) treated with ENRT combined with androgen deprivation therapy (ADT) between 2004 and 2016 were retrospectively reviewed. Median prostate-specific antigen (PSA) and PSA doubling time (DT) were 3...
January 8, 2018: American Journal of Clinical Oncology
https://www.readbyqxmd.com/read/29314080/a-simple-model-for-transit-dosimetry-based-on-a-water-equivalent-epid
#4
S Deshpande, S J Blake, A Xing, P E Metcalfe, L C Holloway, P Vial
PURPOSE: To demonstrate a new model for implementing a transit dosimetry system as a means of in vivo dose verification with a water-equivalent electronic portal imaging device (WE-EPID) and a conventional treatment planning system (TPS). METHOD AND MATERIALS: A standard amorphous silicon (a-Si) EPID was modified to a WE-EPID configuration by replacing the metal-plate/phosphor screen situated above the photodiode detector with a 3 cm thick water equivalent plastic x-ray converter material...
January 3, 2018: Medical Physics
https://www.readbyqxmd.com/read/29312634/experimental-verification-of-a-3d-in-vivo-dose-monitoring-system-based-on-epid
#5
Xiaoyong Wang, Lixin Chen, Conghua Xie, Dajiang Wang, Gaili Chen, Zhengming Fu, Hui Liu
Purpose: To evaluate the Edose system, a novel three-dimensional (3D) in vivo dose monitoring system based on electronic portal imaging device (EPID), prior to clinical application, we analyzed the preliminary clinical data using Edose system in patients receiving intensity-modulated radiation therapy (IMRT). Materials and methods: After the physical modeling, the measured results from the Edose system were examined in homogeneous and inhomogeneous phantoms, respectively...
December 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/29310978/bowel-and-urinary-quality-of-life-after-whole-pelvic-versus-prostate-only-volumetric-modulated-arc-therapy-for-localized-prostate-cancer
#6
Kentaro Ishii, Toshiko Yamanaga, Ryo Ogino, Yukinari Hosokawa, Shun Kishimoto, Ryuta Nakahara, Chiaki Shimada, Ryu Kawamorita, Takuhito Tada, Yoshiki Hayashi, Toshifumi Nakajima
PURPOSE: This study aimed to compare bowel and urinary health-related quality of life (HRQOL) between prostate-only (PO) volumetric modulated arc therapy (VMAT) and whole-pelvis (WP) VMAT in patients with localized prostate cancer. METHODS AND MATERIALS: A total of 234 patients treated with definitive VMAT to 78 Gy in 39 fractions were enrolled. Of these, 108 patients received PO-VMAT and 126 patients received initial WP-VMAT to 46.8 Gy in 26 fractions using a simultaneous integrated boost technique...
November 5, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29309800/partial-reversal-of-the-effort-related-motivational-effects-of-tetrabenazine-with-the-mao-b-inhibitor-deprenyl-selegiline-implications-for-treating-motivational-dysfunctions
#7
Hector Contreras-Mora, Megan A Rowland, Samantha E Yohn, Merce Correa, John D Salamone
People with depression and Parkinsonism frequently show effort-related motivational symptoms, such as anergia, psychomotor retardation, and fatigue. Tasks that assess effort-related choice are being used as animal models of these motivational symptoms. The present studies characterized the ability of monoamine oxidase (MAO) inhibitors with varying selectivity profiles to reverse the low effort bias induced by the monoamine storage inhibitor tetrabenazine. Tetrabenazine produces depressive symptoms in humans, and because of its selective inhibition of VMAT-2, it preferentially depletes DA at low doses...
January 5, 2018: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/29304105/dosimetric-evaluation-of-magnetic-resonance-generated-synthetic-ct-for-radiation-treatment-of-rectal-cancer
#8
Hesheng Wang, Kevin Du, Juliet Qu, Hersh Chandarana, Indra J Das
PURPOSE: The purpose of this study was to assess the dosimetric equivalence of magnetic resonance (MR)-generated synthetic CT (synCT) and simulation CT for treatment planning in radiotherapy of rectal cancer. METHODS: This study was conducted on eleven patients who underwent whole-body PET/MR and PET/CT examination in a prospective IRB-approved study. For each patient synCT was generated from Dixon MR using a model-based method. Standard treatment planning directives were used to create a four-field box (4F), an oblique four-field (O4F) and a volumetric modulated arc therapy (VMAT) plan on synCT for treatment of rectal cancer...
2018: PloS One
https://www.readbyqxmd.com/read/29300184/correlations-between-contouring-similarity-metrics-and-simulated-treatment-outcome-for-prostate-radiotherapy
#9
Dale Roach, Michael G Jameson, Jason A Dowling, Martin Andrew Ebert, Peter B Greer, Angel M Kennedy, Sandie Watt, Lois C Holloway
Many similarity metrics exist for inter-observer contouring variation studies, however no correlation between metric choice and prostate cancer radiotherapy dosimetry has been explored. These correlations were investigated in this study. Two separate trials were undertaken, the first a thirty-five patient cohort with three observers, the second a five patient dataset with ten observers. Clinical and planning target volumes (CTV and PTV), rectum, and bladder were independently contoured by all observers in each trial...
January 4, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29297232/dosimetric-quantification-of-the-incidental-irradiation-of-the-true-deep-ano-inguinal-lymphatic-drainage-of-anal-cancer-patients-not-described-in-conventional-contouring-guidelines
#10
Hendrik Dapper, Gregor Habl, Christoph Hirche, Stefan Münch, Markus Oechsner, Michael Mayinger, Christina Sauter, Stephanie E Combs, Daniel Habermehl
INTRODUCTION: The ano-inguinal lymphatic drainage (AILD) is located in the subcutaneous adipose tissue of the proximal medial thigh. Findings from fluorescence methods give us new information about anatomical conditions of the AILD. Current contouring guidelines do not advise the inclusion of the 'true' AILD into the clinical target volume (CTV). Aim of this work was the retrospective analysis of the incidental dose to the AILD in an anal cancer (AC) patient cohort who underwent definitive chemoradiation (CRT) therapy with Volumetric Arc Therapy - Intensity Modulated Radiation Therapy (VMAT-IMRT)...
January 3, 2018: Acta Oncologica
https://www.readbyqxmd.com/read/29296041/verification-of-dosimetric-commissioning-accuracy-of-intensity-modulated-radiation-therapy-and-volumetric-modulated-arc-therapy-delivery-using-task-group-119-guidelines
#11
Karunakaran Kaviarasu, N Arunai Nambi Raj, Misba Hamid, A Ananda Giri Babu, Lingampally Sreenivas, Kammari Krishna Murthy
Aim: The purpose of this study is to verify the accuracy of the commissioning of intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) based on the recommendation of the American Association of Physicists in Medicine Task Group 119 (TG-119). Materials and Methods: TG-119 proposes a set of clinical test cases to verify the accuracy of IMRT planning and delivery system. For these test cases, we generated two sets of treatment plans, the first plan using 7-9 IMRT fields and a second plan utilizing two-arc VMAT technique for both 6 MV and 15 MV photon beams...
October 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/29296040/evaluation-and-performance-of-arccheck-and-film-using-gamma-criteria-in-pre-treatment-quality-assurance-of-stereotactic-ablative-radiotherapy
#12
Prabhakar Ramachandran, Abdulrahman Tajaldeen, David Taylor, Derrick Wanigaratne, Karl Roozen, Moshi Geso
Aim: The aim of this study is to assess the use of ArcCHECK (AC) as an alternative method to replace film dosimetry for pre-treatment quality assurance (QA) of three-dimensional conformal radiation therapy, intensity-modulated radiation therapy (IMRT), and volumetric-modulated arc therapy (VMAT) stereotactic ablative radiotherapy (SABR) treatment plans. Materials and Methods: Twenty-five patients with a varied diagnosis of lung, spine, sacrum, sternum, ribs, scapula, and femur undergoing SABR were selected for this study...
October 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/29296037/estimating-second-malignancy-risk-in-intensity-modulated-radiotherapy-and-volumetric-modulated-arc-therapy-using-a-mechanistic-radiobiological-model-in-radiotherapy-for-carcinoma-of-left-breast
#13
Vasanthan Sakthivel, Ganesh Kadirampatti Mani, Sunil Mani, Raghavendiran Boopathy, Jothybasu Selvaraj
Objectives: The aim of this study is to estimate second cancer risk (SCR) in intensity-modulated radiotherapy (IMRT) and volumetric-modulated arc therapy (VMAT) using a mechanistic radiobiological model. The model also takes into account patient age at exposure and the gender-specific correction factors of SCR. Materials and Methods: Fifty IMRT and VMAT plans were selected for the study. Monte Carlo-based dose calculation engine was used for dose calculation. Appropriate model parameters were taken from the literature for the mechanistic model to calculate excess absolute risk (EAR), lifetime attributable risk, integral dose and relative risk (RR) for lungs, contralateral breast, heart, and spinal cord...
October 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/29289456/the-potential-for-increased-tumor-control-probability-in-non-small-cell-lung-cancer-with-a-hypofractionated-integrated-boost-to-the-gross-tumor-volume
#14
Cathy Fleming, Serena O'Keeffe, Mary Dunne, John G Armstrong, Brendan McClean, Luis Leon Vintro
Treatment outcomes in locally advanced non-small cell lung cancer (NSCLC) to date have been poor, with normal tissue toxicity often limiting the dose that can be delivered to the tumor. Treatment intensification in NSCLC via targeted dose escalation with modern delivery techniques may offer the potential for a significant increase in tumor control probability (TCP) without a clinically significant increase in organ-at-risk (OAR) toxicity. In this planning study, 20 patients were re-planned with a volumetric modulated arc therapy (VMAT) and an inhomogeneous dose distribution with iteratively escalated doses to the gross tumor volume (iGTV) (composite GTV across multiple 4-dimensional computed tomography [4DCT] phases) in a series of 20 fraction regimes...
December 27, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29286616/dosimetric-validation-of-volumetric-modulated-arc-therapy-with-three-6mv-beam-matched-linear-accelerators
#15
Sangaiah Ashokkumar, K M Ganesh, K Ramalingam, K Karthikeyan, N Jagadheeskumar
Background: To avoid inconvenience to patients due to linear accelerator down time in busy radio-therapy departments, treatment plans can be switched between linear accelerators provided that all exhibit the same same dosimetric characteristics. In other words linear accelerators should be beam-matched. Aim: The aim of this study was to evaluate the clinical significance of beam-matching using VMAT plans. Materials and Methods: Dosimetric data with a 6MV beam from am Clinac 2100CD were taken as baseline values and other two units, a 2300CD and a Unique Performance, were factory tuned in accordance...
December 29, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/29280467/potential-of-proton-therapy-to-reduce-acute-hematologic-toxicity-in-concurrent-chemoradiation-therapy-for-esophageal-cancer
#16
Samantha Warren, Christopher N Hurt, Thomas Crosby, Mike Partridge, Maria A Hawkins
PURPOSE: Radiation therapy dose escalation using a simultaneous integrated boost (SIB) is predicted to improve local tumor control in esophageal cancer; however, any increase in acute hematologic toxicity (HT) could limit the predicted improvement in patient outcomes. Proton therapy has been shown to significantly reduce HT in lung cancer patients receiving concurrent chemotherapy. Therefore, we investigated the potential of bone marrow sparing with protons for esophageal tumors. METHODS AND MATERIALS: Twenty-one patients with mid-esophageal cancer who had undergone conformal radiation therapy (3D50) were selected...
November 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29277249/fine-tuning-the-normal-tissue-objective-in-eclipse-for-lung-stereotactic-body-radiation-therapy
#17
James P Bell, Pretesh Patel, Kristin Higgins, Mark W McDonald, Justin Roper
The purpose of this study was to characterize the effects of the normal tissue objective (NTO) on lung stereotactic body radiation therapy (SBRT) dose distributions. The NTO is a spatially varying constraint used in Eclipse to limit dose to normal tissues by steepening the dose gradient. However, the multitude of potential NTO setting combinations challenges optimal NTO tuning. In the present study, a broad range of NTO settings are investigated for lung SBRT treatment planning with volumetric modulated arc therapy(VMAT)...
December 22, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29258539/critical-appraisal-of-the-role-of-volumetric-modulated-arc-therapy-in-the-radiation-therapy-management-of-breast-cancer
#18
REVIEW
Luca Cozzi, Frank Lohr, Antonella Fogliata, Davide Franceschini, Fiorenza De Rose, A R Filippi, Gabriele Guidi, Valentina Vanoni, Marta Scorsetti
BACKGROUND: The aim of this review is the critical appraisal of the current use of volumetric modulated arc therapy for the radiation therapy management of breast cancer. Both clinical and treatment planning studies were investigated. MATERIAL AND METHODS: A Pubmed/MEDLINE search of the National Library of Medicine was performed to identify VMAT and breast related articles. After a first order rejection of the irrelevant findings, the remaining articles were grouped according to two main categories: clinical vs...
December 19, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/29249528/critical-appraisal-of-the-risk-of-secondary-cancer-induction-from-breast-radiation-therapy-with-volumetric-modulated-arc-therapy-relative-to-3d-conformal-therapy
#19
Antonella Fogliata, Fiorenza De Rose, Davide Franceschini, Antonella Stravato, Jan Seppälä, Marta Scorsetti, Luca Cozzi
PURPOSE: To evaluate the excess absolute risk (EAR) comparing volumetric modulated arc therapy (VMAT) and 3-dimensional (3D) conformal radiation therapy (CRT) in breast cancer radiation therapy treatment. METHODS AND MATERIALS: Two VMAT arrangements (VMAT_tang and VMAT_full, i.e. partial arcs with and without a sector of 0 Monitor Unit, respectively) and a 3D CRT (field-in-field [FinF]) plan were calculated with an accurate dose calculation algorithm, Acuros, in 20 patients presenting with early-stage breast cancer...
October 31, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29229326/quantifying-the-effect-of-3t-magnetic-resonance-imaging-residual-system-distortions-and-patient-induced-susceptibility-distortions-on-radiation-therapy-treatment-planning-for-prostate-cancer
#20
Mary Adjeiwaah, Mikael Bylund, Josef A Lundman, Camilla Thellenberg Karlsson, Joakim H Jonsson, Tufve Nyholm
PURPOSE: To investigate the effect of magnetic resonance system- and patient-induced susceptibility distortions from a 3T scanner on dose distributions for prostate cancers. METHODS AND MATERIALS: Combined displacement fields from the residual system and patient-induced susceptibility distortions were used to distort 17 prostate patient CT images. VMAT dose plans were initially optimized on distorted CT images and the plan parameters transferred to the original patient CT images to calculate a new dose distribution...
October 20, 2017: International Journal of Radiation Oncology, Biology, Physics
keyword
keyword
16097
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"