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

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https://www.readbyqxmd.com/read/29110926/study-for-reducing-lung-dose-of-upper-thoracic-esophageal-cancer-radiotherapy-by-auto-planning-volumetric-modulated-arc-therapy-vs-intensity-modulated-radiation-therapy
#1
Hua Chen, Hao Wang, Hengle Gu, Yan Shao, Xuwei Cai, Xiaolong Fu, Zhiyong Xu
This study aimed to investigate the dosimetric differences and lung sparing between volumetric-modulated arc therapy (VMAT) and intensity-modulated radiation therapy (IMRT) in the treatment of upper thoracic esophageal cancer with T3N0M0 for preoperative radiotherapy by auto-planning (AP). Sixteen patient cases diagnosed with upper thoracic esophageal cancer T3N0M0 for preoperative radiotherapy were retrospectively studied, and 3 plans were generated for each patient: full arc VMAT AP plan with double arcs, partial arc VMAT AP plan with 6 partial arcs, and conventional IMRT AP plan...
October 27, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29110925/a-novel-imrt-planning-study-by-using-the-fixed-jaw-method-in-the-treatment-of-peripheral-lung-cancer-with-mediastinal-lymph-node-metastasis
#2
Hao Wang, Hua Chen, Hengle Gu, Yan Shao, Xuwei Cai, Xiaolong Fu, Zhiyong Xu
Intensity-modulated radiotherapy (IMRT) is an important technology in cancer radiotherapy. In the current planning system, such as in the Pinnacle(3) system, jaw positions are automatically set to cover all target volumes, and many medical centers in developing countries are not equipped with linear accelerators with a jaw tracing function. As solitary lesions are often located in patients, the resulting radiation leakage and transmission increase the dose exposure in surrounding critical organs, although blocked by multileaf collimator (MLC) leaves...
October 27, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29107387/dynamics-of-the-vaginal-wall-dose-in-hdr-interstitial-brachytherapy-for-gynecological-cancer-systematic-analysis-of-phantom-vs-patient-case
#3
Robert Y Kim, Andrew M McDonald, Omer Lee Burnett, Sui Shen
This study aimed to investigate the dynamics of the vaginal wall dose for interstitial brachytherapy (ISBT). A patient undergoing ISBT was selected as the patient case. The phantom case was generated to simulate the patient case in all regards with the exception of parallel needle positions. The vaginal wall was contoured as a 0.5-cm expansion around the vaginal surface of the obturator. The prescribed ISBT dose was 20 Gy in 4 fractions. Six treatment plans were generated by modifying relative dwell times and needle positions (DTNP)...
October 26, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29079336/photon-optimizer-po-vs-progressive-resolution-optimizer-pro-a-conformality-and-complexity-based-comparison-for-intensity-modulated-arc-therapy-plans
#4
Diana Binny, Tanya Kairn, Craig M Lancaster, Jamie V Trapp, Scott B Crowe
This study aimed to provide guidance on the advantages and limitations of a new optimizer, "photon optimizer" (PO), when compared with its predecessor, "progressive resolution optimizer" (PRO), for intensity-modulated arc therapy (IMAT) plans. Eleven study plans that included a cohort of prostate, head and neck, and brain treatment sites were optimized using both PRO and PO algorithms. A plan template using the same objectives for the same number of iterations was used for each optimized plan to obtain hypothetical treatment plans that would be comparable with a clinical plan...
October 24, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29031904/definitive-radiotherapy-for-a-head-and-neck-merkel-cell-carcinoma-and-comprehensive-nodal-volumes-a-case-for-using-a-computer-designed-variable-thickness-compensator-to-reduce-risk-and-severity-of-mucositis
#5
Anesa Ahamad, Donald T Weed, Darel D Pruett, Daniel Saulpaugh, Womah Neeranjun, Eduardo Fernandez
When contemplating how to treat head and neck primary cancers and regional lymph nodes with radiotherapy, we often select the contemporary intensity-modulated radiotherapy (IMRT) without much consideration of older methods that may give fewer side effects and be more cost-effective. For an 87-year-old female with a 1.5-cm Merkel cell carcinoma (MCC) located 1.5 cm lateral to the orbital rim, we were challenged to deliver 50 Gy to comprehensive elective nodal regions and 70 Gy to the primary. We were particularly concerned about the potential adverse acute effects of radiotherapy to mucosal structures in this elderly female...
October 11, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29032865/electron-postmastectomy-chest-wall-plus-comprehensive-nodal-irradiation-technique-using-electron-monte-carlo-dose-algorithm
#6
Linda Hong, Ase Ballangrud, Beryl McCormick, James Mechalakos
For left-sided postmastectomy patients requiring chest wall plus comprehensive nodal irradiation, sometimes traditional techniques such as partial wide tangents or electron/tangents combination are not feasible due to abnormal chest wall contour or heart position or unusually wide excision scar. We developed electron chest wall irradiation technique using Electron Monte Carlo (EMC) dose algorithm that will achieve heart sparing with acceptable ipsilateral lung dose, minimal contralateral lung, and breast dose...
October 9, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28993019/a-modified-formula-for-dose-calculations-of-stereotactic-ablative-body-radiotherapy-for-non-small-cell-lung-cancer
#7
Yangsen Cao, Xiaofei Zhu, Yu Zhang, Chunshan Yu, Yongming Liu, Yongjian Sun, Zhitao Dai, Xueling Guo, Xiaoping Ju, Huojun Zhang
To provide a modified formula consistent with the Monte Carlo (MC) algorithm for dose calculations during stereotactic ablative body radiotherapy for non-small cell lung cancer. Seventy CyberKnife treatment plans were calculated and analyzed by MC and ray-tracing (RT) algorithms, separately. Parameters of treatment plans were compared, and those associated with differences of dose distributions were analyzed to establish a modified formula. Gross tumor volume and tumor tracking volume (TTV) were defined as the evident disease on the sequences of the window width and level of the lung and the mediastinum...
October 6, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28988893/radiation-therapy-of-synchronous-bilateral-breast-carcinoma-sbbc-using-multiple-techniques
#8
Sung Jin Kim, Mi Jo Lee, Seon Min Youn
The purpose of this study was to establish intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) treatment plans for synchronous bilateral breast cancer (SBBC) and to compare those plans with the previous treatment plans using 3D conformal radiation therapy (3DCRT). The differences among the treatments were also statistically compared regarding dosimetry distribution and treatment efficiency. The research was conducted with 10 SBBC patients. The study established IMRT (12 fields with a single isocenter) and VMAT (2 partial arcs with a single isocenter) treatment plans for SBBC patients and then compared those plans with 3DCRT (8 fields with multiple isocenters)...
October 5, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28988675/application-of-geant4-monte-carlo-simulation-in-dose-calculations-for-small-radiosurgical-fields
#9
Somayeh Gholami, Francesco Longo, Hassan Ali Nedaie, Alessio Berti, Mehdi Mousavi, Ali S Meigooni
The Geant4 toolkit was used to develop a Monte Carlo (MC)-based engine for accurate dose calculations in small radiation field sizes. The Geant4 toolkit (version 10.1.p02) was used to simulate 6-MV photon beam of a Varian2100C linear accelerator that is being used for stereotactic radiosurgery (SRS) treatment with small radiation fields. Geometric models of 3 in-house designed radiosurgical divergent cones, with the diameters of their projections at the isocenter being 10, 20, and 30 mm, were simulated. The accuracy of the MC simulation technique was examined by reproducing several different simulated dosimetric parameters of the primary beams with the experimental data...
October 4, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28964621/aaa-and-axb-algorithms-for-the-treatment-of-nasopharyngeal-carcinoma-using-imrt-and-rapidarc-techniques
#10
Maha Kamaleldin, Nader A Elsherbini, Wael M Elshemey
The aim of this study is to evaluate the impact of anisotropic analytical algorithm (AAA) and 2 reporting systems (AXB-Dm and AXB-Dw) of Acuros XB algorithm (AXB) on clinical plans of nasopharyngeal patients using intensity-modulated radiotherapy (IMRT) and RapidArc (RA) techniques. Six plans of different algorithm-technique combinations are performed for 10 patients to calculate dose-volume histogram (DVH) physical parameters for planning target volumes (PTVs) and organs at risk (OARs). The number of monitor units (MUs) and calculation time are also determined...
September 27, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28958472/evaluation-of-dose-recalculation-vs-dose-deformation-in-a-commercial-platform-for-deformable-image-registration-with-a-computational-phantom
#11
Marco Fusella, Francesca R Giglioli, Christian Fiandra, Riccardo Ragona
Deformable image registration (DIR) is an important tool for mapping both dose and contours of a new set of planning images when recurrent, that is, adaptive radiotherapy, or further treatment, that is, re-treatment, is required. The aim of this study was to evaluate the need for plan recalculation in deformed anatomies and to develop a reliable workflow for validating the DIR algorithm to be applied to dose warping such as dose accumulation (DA) for adaptive radiation therapy, and dose summation (DS) in the case of re-treatment...
September 25, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28958471/dosimetric-evaluation-of-mlc-based-dynamic-tumor-tracking-radiotherapy-using-digital-phantom-desired-setup-margin-for-tracking-radiotherapy
#12
Noriyuki Kadoya, Kei Ichiji, Tomoya Uchida, Yujiro Nakajima, Ryutaro Ikeda, Yosuke Uozumi, Xiaoyong Zhang, Ivo Bukovsky, Takaya Yamamoto, Ken Takeda, Yoshihiro Takai, Keiichi Jingu, Noriyasu Homma
The purpose of this study is to evaluate the dosimetric impact of the margin on the multileaf collimator-based dynamic tumor tracking plan. Furthermore, an equivalent setup margin (EM) of the tracking plan was determined according to the gated plan. A 4-dimensional extended cardiac-torso was used to create 9 digital phantom datasets of different tumor diameters (TDs) of 1, 3, and 5 cm and motion ranges (MRs) of 1, 2, and 3 cm. For each dataset, respiratory gating (30% to 70% phase) and tumor tracking treatment plans were prepared using 8-field 3-dimensional conformal radiation therapy by 4-dimensional dose calculation...
September 25, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28935521/a-study-of-the-dosimetric-characteristics-between-different-fixed-field-imrt-and-vmat-in-early-stage-primary-mediastinal-b-cell-lymphoma
#13
Li-Ming Xu, Ming-Lei Kang, Bo Jiang, Qing-Feng Liu, Ye-Xiong Li
This analysis was designed to compare dosimetric parameters among different fixed-field intensity-modulated radiation therapy (IMRT) solutions and volumetric-modulated arc therapy (VMAT) to identify which can achieve the lowest risk of organs at risk (OARs) and treatment delivery efficiently. A total of 16 patients (8 male and 8 female) with early-stage primary mediastinal large B-cell lymphoma (PMBCL) were enrolled with planned gross tumor volume (PGTV) 45 Gy and planning target volume (PTV) 40 Gy. Four different plans were generated: 5-, 7, 9-field IMRT, and VMAT...
September 18, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28927550/assessing-dose-variance-from-immobilization-devices-in-vmat-head-and-neck-treatment-planning-a-retrospective-case-study-analysis
#14
Alyssa Olson, Kristine Phillips, Tamara Eng, Nishele Lenards, Ashley Hunzeker, Daniel Lewis, Douglas Baumann
Immobilization devices serve several purposes in radiation oncology including improved positional reproducibility and decreased patient movement. If immobilization device beam attenuation is unaccounted for in the treatment planning process, planning target volume (PTV) coverage can be compromised. A retrospective case study was performed to evaluate beam attenuation from head and neck (HN) immobilization devices in volumetric-modulated arc therapy using the Eclipse treatment planning system and the Anisotropic Analytical Algorithm...
September 15, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28886961/a-feasibility-study-of-using-advanced-external-beam-techniques-to-create-a-vaginal-cuff-brachytherapy-like-endometrial-boost-plan
#15
Zachary Grelewicz, Brooke Zerrusen, Vythialingam Sathiaseelan, Hualin Zhang
The purpose of this study was to explore the feasibility of using advanced external beam radiation therapy (EBRT) planning techniques for creating plans that could be used as a possible alternative for high-dose rate (HDR) vaginal cuff brachytherapy (VCBT) boost in treating endometrial cancer. The computed tomography (CT) images of a total of 4 female patients who had endometrial cancer treated with HDR-VCBT were selected for this study. A typical HDR-VCBT target volume, 0.5-cm-thick shell volume around the cylinder applicator in the prescribed treatment length was contoured and used as the planning target volume (PTV) in both the HDR VCBT and the EBRT VCBT-like plans...
September 5, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28870525/rectal-balloon-use-limits-vaginal-displacement-rectal-dose-and-rectal-toxicity-in-patients-receiving-imrt-for-postoperative-gynecological-malignancies
#16
Cheng-Chia Wu, Yen-Ruh Wuu, Theodore Yanagihara, Ashish Jani, Eric P Xanthopoulos, Akhil Tiwari, Jason D Wright, William M Burke, June Y Hou, Ana I Tergas, Israel Deutsch
Pelvic radiotherapy for gynecologic malignancies traditionally used a 4-field box technique. Later trials have shown the feasibility of using intensity-modulated radiotherapy (IMRT) instead. But vaginal movement between fractions is concerning when using IMRT due to greater conformality of the isodose curves to the target and the resulting possibility of missing the target while the vagina is displaced. In this study, we showed that the use of a rectal balloon during treatment can decrease vaginal displacement, limit rectal dose, and limit acute and late toxicities...
September 1, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28867367/clinical-analysis-of-the-approximate-3-dimensional-biological-effective-dose-equation-in-multiphase-treatment-plans
#17
Kevin I Kauweloa, Alonso N Gutierrez, Angelo M Bergamo, Sotirios Stathakis, Nikos Papanikolaou, Panayiotis Mavroidis
A multiphase, approximate biological effective dose (BEDA) equation was introduced because most treatment planning systems (TPS) are incapable of calculating the true BED (BEDT). This work investigates the accuracy and precision of the multiphase BEDA relative to the BEDT in clinical cases. Ten patients with head and neck cancer and 10 patients with prostate cancer were studied using their treatment plans from Pinnacle(3) 9.2 (Philips Medical, Fitchburg, WI). The organs at risk (OARs) that were studied are the normal brain, left and right optic nerves, optic chiasm, spinal cord, brainstem, bladder, and rectum...
August 31, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28843380/the-impact-of-intensity-modulated-radiation-therapy-plan-normalization-in-the-postprostatectomy-setting-does-it-matter
#18
Mary Anne Stritch, Elizabeth Forde, Michelle Leech
The International Commission on Radiation Units & Measurements -83 recommends prescribing intensity-modulated radiation therapy (IMRT) in a dose-volume manner. Despite this, clinical variation still exists in how prostate IMRT plans are prescribed. This study aims to investigate the impact of different plan normalization methods for postprostatectomy IMRT. IMRT treatment plans were created retrospectively for 20 postprostatectomy patients. These were normalized such that the dose received by 98% (D98) of the planning target volume (PTV) was equal to 100% of the prescribed dose...
August 23, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28822604/volumetric-modulated-arc-therapy-vmat-for-whole-brain-radiotherapy-not-only-for-hippocampal-sparing-but-also-for-reduction-of-dose-to-organs-at-risk
#19
Sumit Sood, Damodar Pokhrel, Christopher McClinton, Christopher Lominska, Rajeev Badkul, Hongyu Jiang, Fen Wang
A prospective clinical trial, Radiation Therapy Oncology Group (RTOG) 0933, has demonstrated that whole brain radiotherapy (WBRT) using conformal radiation delivery technique with hippocampal avoidance is associated with less memory complications. Further sparing of other organs at risk (OARs) including the scalp, ear canals, cochleae, and parotid glands could be associated with reductions in additional toxicities for patients treated with WBRT. We investigated the feasibility of WBRT using volumetric-modulated arc therapy (VMAT) to spare the hippocampi and the aforementioned OARs...
August 16, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28818321/influence-of-computed-tomography-contrast-agent-on-radiotherapy-dose-calculation-for-pancreatic-carcinoma-a-dosimetric-study-based-on-tomotherapy-and-volumetric-modulated-arc-therapy-techniques
#20
Feng Zhu, Weizhang Wu, Fuhai Zhu, Yong Wang, Yingjie Wang, Tingyi Xia
The main purpose of our investigation was to quantify the dosimetric influence of intravenous contrast agent for pancreatic cancer radiotherapy treatment. This study focused on complex modulated irradiation techniques of tomotherapy (TOMO) and volumetric-modulated arc therapy (VMAT) to investigate if novel conformal treatment methods could reduce the influence of contrast agent. In our study, patients with pancreatic cancer were enrolled to have 2 computed tomography (CT) scans in the same position without and with intravenous contrast agent for treatment planning...
August 14, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
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