journal
MENU ▼
Read by QxMD icon Read
search

Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists

journal
https://www.readbyqxmd.com/read/28129973/acute-toxicity-and-its-dosimetric-correlates-for-high-risk-prostate-cancer-treated-with-moderately-hypofractionated-radiotherapy
#1
Moses Arunsingh, Indranil Mallick, Sriram Prasath, B Arun, Sandip Sarkar, Raj Kumar Shrimali, Sanjoy Chatterjee, Rimpa Achari
AIMS: To report the acute toxicity and the dosimetric correlates after moderately hypofractionated radiotherapy for localized prostate cancer. METHODS: A total of 101 patients with localized prostate cancer were treated with image-guided intensity-modulated radiation therapy. Patients were treated to 65Gy/25Fr/5 weeks (n = 18), or 60Gy/20Fr/4 weeks (n = 83). Most (82.2%) had high-risk or pelvic node-positive disease. Acute toxicity was assessed using Radiation Therapy Oncology Group (RTOG) acute morbidity scoring criteria...
January 24, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28129972/on-the-use-of-volumetric-modulated-arc-therapy-for-single-fraction-thoracic-vertebral-metastases-stereotactic-body-radiosurgery
#2
Damodar Pokhrel, Sumit Sood, Christopher McClinton, Xinglei Shen, Rajeev Badkul, Hongyu Jiang, Matthew Mallory, Mellissa Mitchell, Fen Wang, Christopher Lominska
To retrospectively evaluate quality, efficiency, and delivery accuracy of volumetric-modulated arc therapy (VMAT) plans for single-fraction treatment of thoracic vertebral metastases using image-guided stereotactic body radiosurgery (SBRS) after RTOG 0631 dosimetric compliance criteria. After obtaining credentialing for MD Anderson spine phantom irradiation validation, 10 previously treated patients with thoracic vertebral metastases with noncoplanar hybrid arcs using 1 to 2 3D-conformal partial arcs plus 7 to 9 intensity-modulated radiation therapy beams were retrospectively re-optimized with VMAT using 3 full coplanar arcs...
January 24, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28129971/dosimetric-aspects-of-breast-radiotherapy-with-three-dimensional-and-intensity-modulated-radiotherapy-helical-tomotherapy-planning-modules
#3
Poonam Yadav, Yue Yan, Tasha Ignatowski, Anna Olson
In this work, we investigated the dosimetric differences between the intensity-modulated radiotherapy (IMRT) plans and the three-dimensional (3D) helical plans based on the TomoTherapy system. A total of 15 patients with supine setup were randomly selected from the data base. For patients with lumpectomy planning target volume (PTV), regional lymph nodes were also included as part of the target. For dose sparing, the significant differences between the helical IMRT and helical 3D were only found in the heart and contralateral breast...
January 24, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28126476/optimization-of-brain-metastases-radiotherapy-with-tomohda
#4
Slav Yartsev, Glenn Bauman
An upgrade of the helical tomotherapy technology by introducing variable fan-field width (dynamic jaws) reduced the penumbra in superior-inferior direction for the target. Possible implementation of this upgrade even for the cases of the targets with different dose prescriptions is proposed. An example of brain metastasis in proximity to the optical apparatus in need of the whole brain irradiation of 30 Gy and higher dose to the lesion is considered.
January 23, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28126475/clinical-benefits-of-new-immobilization-system-for-hypofractionated-radiotherapy-of-intrahepatic-hepatocellular-carcinoma-by-helical-tomotherapy
#5
Yong Hu, Yong-Kang Zhou, Yi-Xing Chen, Shi-Ming Shi, Zhao-Chong Zeng
OBJECTIVE: A comprehensive clinical evaluation was conducted, assessing the Body Pro-Lok immobilization and positioning system to facilitate hypofractionated radiotherapy of intrahepatic hepatocellular carcinoma (HCC), using helical tomotherapy to improve treatment precision. METHODS: Clinical applications of the Body Pro-Lok system were investigated (as above) in terms of interfractional and intrafractional setup errors and compressive abdominal breath control...
January 23, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28126474/can-cost-make-a-difference-dosimetrically-volumetric-modulated-arc-therapy-study-for-multileaf-collimators-of-various-widths-for-head-and-neck-and-prostate-cancers
#6
Jong-Han Ho, Shane Hagler, Carrie Lujano, Sopaul Seng, Christine Starks, Kelly Perrin, Lehendrick Turner, Laurence Court
Cancer is a global health issue that disproportionately kills based on stage of disease, cellular pathology, and genetics, to name a few. Another variable to consider in this ongoing fight is treatment machine complexity that leads to elevated development and purchasing cost, leading to a reduced use. Reducing the complexity (in hopes of lowering costs) would benefit underdeveloped, low- and middle-income countries by introducing newer treatment technology, as their currently accepted standards do not meet standards of more advanced, developed countries...
January 23, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28126473/the-dilemma-of-parotid-gland-and-pharyngeal-constrictor-muscles-preservation-is-daily-online-image-guidance-required-a-dosimetric-analysis
#7
Olivia Duffy, Elizabeth Forde, Michelle Leech
With margin reduction common in head and neck radiotherapy, it is critical that the dosimetric effects of setup deviations are quantified. With past studies focusing on the quantification of positional and volumetric changes of organs at risk (OARs), this study aimed to measure the dose delivered to these the parotid gland (PG) and pharyngeal constrictor muscles (PCMs) using cone beam computed tomography (CBCT). Furthermore, this investigation sought to establish a potential time trend of change in dose delivered to target volumes secondary to ascertaining the need for daily image guidance (IG) to reduce the dose burden to these important OARs...
January 23, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28126472/dosimetric-effect-of-beam-arrangement-for-intensity-modulated-radiation-therapy-in-the-treatment-of-upper-thoracic-esophageal-carcinoma
#8
Yuchuan Fu, Min Deng, Xiaojuan Zhou, Qiang Lin, Bin Du, Xue Tian, Yong Xu, Jin Wang, You Lu, Youling Gong
To evaluate the lung sparing in intensity-modulated radiation therapy (IMRT) for patients with upper thoracic esophageal tumors extending inferiorly to the thorax by different beam arrangement. Overall, 15 patient cases with cancer of upper thoracic esophagus were selected for a retrospective treatment-planning study. Intensity-modulated radiation therapy plans using 4, 5, and 7 beams (4B, 5B, and 7B) were developed for each patient by direct machine parameter optimization (DMPO). All plans were evaluated with respect to dose volumes to irradiated targets and normal structures, with statistical comparisons made between 4B with 5B and 7B intensity-modulated radiation therapy plans...
January 23, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27919621/a-comparative-study-of-standard-intensity-modulated-radiotherapy-and-rapidarc-planning-techniques-for-ipsilateral-and-bilateral-head-and-neck-irradiation
#9
Jennifer Pursley, Antonio L Damato, Maria A Czerminska, Danielle N Margalit, David J Sher, Roy B Tishler
The purpose of this study was to investigate class solutions using RapidArc volumetric-modulated arc therapy (VMAT) planning for ipsilateral and bilateral head and neck (H&N) irradiation, and to compare dosimetric results with intensity-modulated radiotherapy (IMRT) plans. A total of 14 patients who received ipsilateral and 10 patients who received bilateral head and neck irradiation were retrospectively replanned with several volumetric-modulated arc therapy techniques. For ipsilateral neck irradiation, the volumetric-modulated arc therapy techniques included two 360° arcs, two 360° arcs with avoidance sectors around the contralateral parotid, two 260° or 270° arcs, and two 210° arcs...
December 2, 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27839693/pencil-beam-scanning-proton-therapy-vs-rotational-arc-radiation-therapy-a-treatment-planning-comparison-for-postoperative-oropharyngeal-cancer
#10
Ontida Apinorasethkul, Maura Kirk, Kevin Teo, Samuel Swisher-McClure, John N Lukens, Alexander Lin
Patients diagnosed with head and neck cancer are traditionally treated with photon radiotherapy. Proton therapy is currently being used clinically and may potentially reduce treatment-related toxicities by minimizing the dose to normal organs in the treatment of postoperative oropharyngeal cancer. The finite range of protons has the potential to significantly reduce normal tissue toxicity compared to photon radiotherapy. Seven patients were planned with both proton and photon modalities. The planning goal for both modalities was achieving the prescribed dose to 95% of the planning target volume (PTV)...
November 7, 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27751618/bladder-radiotherapy-treatment-a-retrospective-comparison-of-3-dimensional-conformal-radiotherapy-intensity-modulated-radiation-therapy-and-volumetric-modulated-arc-therapy-plans
#11
Katia Pasciuti, Shrinivas Kuthpady, Anne Anderson, Bronagh Best, Saleem Waqar, Subhra Chowdhury
To examine tumor׳s and organ׳s response when different radiotherapy plan techniques are used. Ten patients with confirmed bladder tumors were first treated using 3-dimensional conformal radiotherapy (3DCRT) and subsequently the original plans were re-optimized using the intensity-modulated radiation treatment (IMRT) and volumetric-modulated arc therapy (VMAT)-techniques. Targets coverage in terms of conformity and homogeneity index, TCP, and organs׳ dose limits, including integral dose analysis were evaluated...
October 14, 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27839589/anatomical-contouring-variability-in-thoracic-organs-at-risk
#12
Ross McCall, Grayden MacLennan, Matthew Taylor, Nishele Lenards, Benjamin E Nelms, Matthew Koshy, Jeffrey Lemons, Ashley Hunzeker
The purpose of this study was to determine whether contouring thoracic organs at risk was consistent among medical dosimetrists and to identify how trends in dosimetrist׳s education and experience affected contouring accuracy. Qualitative and quantitative methods were used to contextualize the raw data that were obtained. A total of 3 different computed tomography (CT) data sets were provided to medical dosimetrists (N = 13) across 5 different institutions. The medical dosimetrists were directed to contour the lungs, heart, spinal cord, and esophagus...
January 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27839588/hybrid-isocenter-technique-for-gamma-knife-perfexion-treatment-of-trigeminal-neuralgia
#13
Young-Bin Cho, Normand Laperriere, Mojgan Hodaie, Caroline Chung
Gamma-Knife (GK), Perfexion (PFX) has 8 sectors that can be blocked compared with the older model 4C, which has 201 independent source blocking options using plugs. This limits the ability of PFX to shape a single isocenter plan, such as trigeminal neuralgia. In this retrospective review and prospective re-planning comparison study of trigeminal neuralgia radiosurgery plans, a hybrid isocenter technique (HIT) is compared with single isocenter GK radiosurgery plans on 2 models (4C and PFX) dosimetric parameters...
January 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
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
#14
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...
January 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27751617/single-fraction-flattening-filter-free-volumetric-modulated-arc-therapy-for-lung-cancer-dosimetric-results-and-comparison-with-flattened-beams-technique
#15
Sara Barbiero, Alexandra Rink, Fabrizio Matteucci, David Fedele, Fabiola Paiar, Francesco Pasqualetti, Michele Avanzo
PURPOSE: To report on single-fraction stereotactic body radiotherapy (RT) (SBRT) with flattening filter (FF)-free (FFF) volumetric modulated arc therapy (VMAT) for lung cancer and to compare dosimetric results with VMAT with FF. METHODS AND MATERIALS: Overall, 25 patients were treated with 6-MV FFF VMAT (Varian TrueBeam STx LINAC) to a prescribed dose of 24Gy in a single fraction. Treatment plans were recreated using FF VMAT. Dose-volume indices, monitor units (MU), and treatment times were compared between FFF and FF VMAT techniques...
January 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27745996/neurovascular-bundle-sparing-radiotherapy-for-prostate-cancer-using-mri-ct-registration-a-dosimetric-feasibility-study
#16
R J Cassidy, X Yang, T Liu, M Thomas, S G Nour, A B Jani
PURPOSE: Sexual dysfunction after radiotherapy for prostate cancer remains an important late adverse toxicity. The neurovascular bundles (NVB) that lie posterolaterally to the prostate are typically spared during prostatectomy, but in traditional radiotherapy planning they are not contoured as an organ-at-risk with dose constraints. Our goal was to determine the dosimetric feasibility of "NVB-sparing" prostate radiotherapy while still delivering adequate dose to the prostate. METHODS: Twenty-five consecutive patients with prostate cancer (with no extraprostatic disease on pelvic magnetic resonance imaging [MRI]) who that were treated with external beam radiotherapy, with the same primary planning target volume margins, to a dose of 79...
January 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27745995/implementation-of-a-volumetric-modulated-arc-therapy-treatment-planning-solution-for-kidney-and-adrenal-stereotactic-body-radiation-therapy
#17
Marcus Sonier, William Chu, Nafisha Lalani, Darby Erler, Patrick Cheung, Renee Korol
To develop a volumetric modulated arc therapy (VMAT) treatment planning solution in the treatment of primary renal cell carcinoma and oligometastatic adrenal lesions with stereotactic body radiation therapy. Single-arc VMAT plans (n = 5) were compared with clinically delivered step-and-shoot intensity-modulated radiotherapy (IMRT) with planning target volume coverage normalized between techniques. Target volume conformity, organ-at-risk (OAR) dose, treatment time, and monitor units were compared. A VMAT planning solution, created from a combination of arc settings and optimization constraints, auto-generated treatment plans in a single optimization...
January 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27692518/treatment-planning-strategy-for-whole-brain-radiotherapy-with-hippocampal-sparing-and-simultaneous-integrated-boost-for-multiple-brain-metastases-using-intensity-modulated-arc-therapy
#18
Damodar Pokhrel, Sumit Sood, Christopher McClinton, Xinglei Shen, Christopher Lominska, Habeeb Saleh, Rajeev Badkul, Hongyu Jiang, Melissa Mitchell, Fen Wang
PURPOSE: To retrospectively evaluate the accuracy, plan quality and efficiency of intensity-modulated arc therapy (IMAT) for hippocampal sparing whole-brain radiotherapy (HS-WBRT) with simultaneous integrated boost (SIB) in patients with multiple brain metastases (m-BM). MATERIALS AND METHODS: A total of 5 patients with m-BM were retrospectively replanned for HS-WBRT with SIB using IMAT treatment planning. The hippocampus was contoured on diagnostic T1-weighted magnetic resonance imaging (MRI) which had been fused with the planning CT image set...
January 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27633817/role-of-belly-board-device-in-the-age-of-intensity-modulated-radiotherapy-for-pelvic-irradiation
#19
Neil C Estabrook, Gregory K Bartlett, Julia J Compton, Higinia R Cardenes, Indra J Das
Small bowel dose often represents a limiting factor for radiation treatment of pelvic malignancies. To reduce small bowel toxicity, a belly board device (BBD) with a prone position is often recommended. Intensity modulated radiotherapy (IMRT) could reduce dose to small bowel based on the desired dose-volume constraints. We investigated the efficacy of BBD in conjunction with IMRT. A total of 11 consecutive patients with the diagnosis of rectal cancer, who were candidates for definitive therapy, were selected...
January 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/27623737/dosimetric-comparison-of-lung-stereotactic-body-radiotherapy-treatment-plans-using-averaged-computed-tomography-and-end-exhalation-computed-tomography-images-evaluation-of-the-effect-of-different-dose-calculation-algorithms-and-prescription-methods
#20
Takamasa Mitsuyoshi, Mitsuhiro Nakamura, Yukinori Matsuo, Nami Ueki, Akira Nakamura, Yusuke Iizuka, Wambaka Ange Mampuya, Takashi Mizowaki, Masahiro Hiraoka
The purpose of this article is to quantitatively evaluate differences in dose distributions calculated using various computed tomography (CT) datasets, dose-calculation algorithms, and prescription methods in stereotactic body radiotherapy (SBRT) for patients with early-stage lung cancer. Data on 29 patients with early-stage lung cancer treated with SBRT were retrospectively analyzed. Averaged CT (Ave-CT) and expiratory CT (Ex-CT) images were reconstructed for each patient using 4-dimensional CT data. Dose distributions were initially calculated using the Ave-CT images and recalculated (in the same monitor units [MUs]) by employing Ex-CT images with the same beam arrangements...
January 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
journal
journal
30141
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"