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

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https://read.qxmd.com/read/31378401/effect-of-collimator-angle-on-hyperarc-stereotactic-radiosurgery-planning-for-single-and-multiple-brain-metastases
#1
Shingo Ohira, Tomohiro Sagawa, Yoshihiro Ueda, Shoki Inui, Akira Masaoka, Yuichi Akino, Hirokazu Mizuno, Masayoshi Miyazaki, Masahiko Koizumi, Teruki Teshima
We assessed the effect of collimator angle on the dosimetric parameters for targets and organs at risk (OARs) for collimator-optimized HA (CO-HA) and non-CO-HA (nCO-HA) plans. The nCO-HA and CO-HA plans were retrospectively generated for 26 patients (1 to 8 brain metastases). The dosimetric parameters for planning target volume (homogeneity index [HI]; conformity index [CI]; gradient index [GI]) and for OARs were compared. The modulation complexity score for volumetric modulated arc therapy (MCSV) and monitor units (MUs) were calculated...
August 1, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31376988/dosimetric-comparison-of-two-treatment-planning-systems-for-spine-sbrt
#2
Young Kyung Lee, Iram Munawar, Shahram Mashouf, Arjun Sahgal, Mark Ruschin
Two commonly used treatment planning systems (TPS) are compared for the planning of spine stereotactic body radiotherapy (SBRT). The main purpose is to highlight relative advantages and disadvantages of each system and propose a methodologic approach for comparisons. Twenty clinical plans were inversely planned with step-and-shoot intensity-modulated radiotherapy (IMRT) each using 9 to 11 beams, referred to as IMRT_P. The prescription dose was 24 Gy in 2 fractions, and the plans were generated following our institutional protocol using the Pinnacle3 v9...
August 1, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31375297/the-effects-of-the-orthopedic-metal-artifact-reduction-o-mar-algorithm-on-contouring-and-dosimetry-of-head-and-neck-radiotherapy-patients
#3
Jussi Sillanpaa, Michael Lovelock, Boris Mueller
Metallic objects, such as dental fillings, cause artifacts in computed tomography (CT) scans. We quantify the contouring and dosimetric effects of Orthopedic Metal Artifact Reduction (O-MAR), in head and neck radiotherapy. The ease of organ contouring was assessed by having a radiation oncologist identify the CT data set with or without O-MAR for each of 28 patients that was easier to contour. The effect on contouring was quantified further by having the physician recontour parotid glands, previously drawn by him on the O-MAR scans, on uncorrected scans, and calculating the Dice coefficent (a measure of overlap) for the contours...
July 30, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31371240/using-a-whiteboard-web-application-for-tracking-treatment-workflow-metrics-for-dosimetrists-and-physicians
#4
Rex A Cardan, Elizabeth L Covington, John B Fiveash, Richard A Popple
We present a framework for collecting data which elucidates detailed clinical flow timelines for different treatment sites, modalities, planners, and physicians in radiotherapy treatments. A web based tool, the Whiteboard, was developed which allows communication between the physicians and staff about the current state of the radiotherapy treatment plan and provides detailed time data for each stage of the patient's journey from simulation to treatment. Detailed timestamped data was collected over a period of 6 years which included 22 discrete steps of the treatment planning process...
July 29, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31345672/automatic-segmentation-for-adaptive-planning-in-nasopharyngeal-carcinoma-imrt-time-geometrical-and-dosimetric-analysis
#5
Nelson Tsz Cheong Fung, Wai Man Hung, Chun Kin Sze, Michael Chi Hang Lee, Wai Tong Ng
The aim of this study was to quantify the geometrical differences between manual contours and autocontours, the dosimetric impacts, and the time gain of using autosegmentation in adaptive nasopharyngeal carcinoma (NPC) intensity-modulated radiotherapy (IMRT) for a commercial system. A total of 20 consecutive Stages I to III NPC patients who had undergone adaptive radiation therapy (ART) re planning for IMRT treatment were retrospectively studied. Manually delineated organs at risks (OARs) on the replanning computed tomography (CT) were compared with the autocontours generated by VelocityAI using deformable registration from the original planning CT...
July 23, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31296358/analyzation-of-the-local-confidence-limits-for-imrt-and-vmat-based-on-aapm-tg119-report
#6
Jun Zhang, Dazhen Jiang, Hui Liu, Jiuling Shen, Dajiang Wang, Cheng Chen, Conghua Xie, Zhen Cao
The aim of this study was to generate a local confidence limit (CL) for intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) techniques for Clinac IX linear accelerator using the American Association of Physicists in Medicine (AAPM) Task Group (TG119) protocol. The results were compared with the published studies to test the capability and quality of the VMAT technique in our clinic. We used TG119 cases to create plans for IMRT and VMAT in Eclipse Treatment Planning System for Clinac IX using 6 MV and 10 MV photons...
July 8, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31221447/an-evaluation-of-adaptive-planning-by-assessing-the-dosimetric-impact-of-weight-loss-throughout-the-course-of-radiotherapy-in-bilateral-treatment-of-head-and-neck-cancer-patients
#7
Zachary Stauch, Wesley Zoller, Kayla Tedrick, Steve Walston, Daniel Christ, Ashley Hunzeker, Nishele Lenards, Lee Culp, Mauricio E Gamez, Dukagjin Blakaj
The purpose of this study was to investigate the dosimetric impact of weight loss in head and neck (H&N) patients and examine the effectiveness of adaptive planning. Data was collected from 22 H&N cancer patients who experienced weight loss during their course of radiotherapy. The robustness of Intensity Modulated Radiation Therapy (IMRT) and Volumetric Modulated Arc Therapy (VMAT) treatment plans were compared including the potential need for replanning. The dosimetric impact of weight loss was evaluated by calculating a verification plan for each patient on an assessment CT scan taken during the course of treatment...
June 17, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31213401/late-course-accelerated-hyperfractionated-intensity-modulated-radiotherapy-for-nasopharyngeal-adenoid-cystic-carcinoma-a-case-report
#8
Dehuan Xie, Aoqiang Chen, Shaowen Lv, Huizhong Zhang, Xuekui Liu, Yong Su
Nasopharyngeal adenoid cystic carcinoma is a rare neoplasm characterized by strong local invasiveness and a higher tendency to relapse. Because of the rare cases, there is a little consensus on treatment. We report a case of T3N0 NACC with a positive resection margin treated with postoperative adjuvant radiotherapy. MRI reexamination indicated suspected tumor progression during the course of radiotherapy. In order to improve local control, late-course accelerated hyperfractionated intensity-modulated radiotherapy (LCAF-IMRT) was performed to escalate total dose, which achieved good local control with no significant late toxicity...
June 15, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31196600/evaluation-of-a-new-hybrid-vmat-imrt-multi-criteria-optimization-plan-generation-algorithm
#9
Myles Spalding, Anthony Walsh, Hayley Clarke, Trent Aland
To evaluate the Varian 'Fast hybrid multi-criteria optimization (MCO) volumetric modulated arc therapy (VMAT)' (H-VMAT) tool for both its dosimetric accuracy and calculation time. This is a new function within V15.6 of the Varian Eclipse treatment planning system that allows VMAT optimization and dose calculation using the graphical processing unit (GPU). In versions prior to V15.6 VMAT MCO calculations were only possible using central processing unit (CPU) not GPU. We termed this approach as native VMAT (N-VMAT)...
June 10, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31176536/tomotherapy-as-a-neoadjuvant-treatment-for-locally-advanced-esophageal-cancer-might-increase-bone-marrow-toxicity-in-comparison-with-intensity-modulated-radiotherapy-and-volumetric-modulated-arc-therapy
#10
Yulong Wang, Qin Xiao, Biao Zeng, Qianxi Ni, Xuewen Liu, Xiaoyang Liu, Lamei Tian, Cai Sheng, Lijuan Peng, Hui Wang
This study compares dosimetric parameters in these following 3 neoadjuvant chemoradiotherapy (NCRT) methods in treating locally advanced esophagus cancer: helical tomotherapy (TOMO), volumetric modulated arc therapy (VMAT), and intensity-modulated radiotherapy (IMRT). It is aimed to ascertain the efficient technique that kept high target coverage and availed the dose sparing of bone marrow (BM). This research collected data on 11 patients from October 2014 to June 2017 who received NCRT for pathologically confirmed esophageal cancer...
June 5, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31153678/assessment-of-deep-inspiration-breath-hold-technique-setup-reproducibility-using-mega-voltage-imaging-for-left-breast-cancer-radiation-therapy-integrated-network-study
#11
HaYeon Kim, M Saiful Huq, Dwight E Heron, Ron Lalonde, Christopher J Houser, Colin E Champ, Sushil Beriwal
We evaluated daily setup reproducibility of deep inspiration breath hold (DIBH) using mega voltage (MV) imaging for left breast cancer radiation therapy. Analysis of 109 left breast cancer patients across UPMC Hillman Cancer Center network treated using DIBH technique with daily MV imaging was done. Patient characteristics, MV imaging procedure used and inter-fraction directional shifts were collected. For the statistical analyses, we separated all patients into 2 groups in each of the following 3 categories; (1) obese (BMI ≥ 30) vs nonobese, (2) mastectomy vs lumpectomy, (3) internal mammary node (IMN) treatment vs no IMN treatment...
May 29, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31138512/evaluation-of-the-robustness-of-3-dimensional-conformal-technique-with-mlc-position-control-into-the-planning-target-volume-in-stereotactic-body-radiotherapy-for-lung-cancer
#12
Masahide Saito, Naoki Sano, Kengo Kuriyama, Takafumi Komiyama, Kan Marino, Shinichi Aoki, Yoshiyasu Maehata, Ryo Saito, Hidekazu Suzuki, Yuki Shibata, Koji Ueda, Hiroshi Onishi
The purpose of this study was to evaluate the robustness of 3-dimensional conformal technique with MLC position control into the planning target volume (PTV) in stereotactic body radiotherapy for lung cancer. Two techniques using fixed beams were compared; one technique involved setting the MLC position outside the PTV and was referred to as Plan "O." Another technique involved setting the MLC position inside the PTV and was referred to as Plan "I." Two tumor motions were simulated: (1) tumor motion on the internal target volume (ITV) boundary and (2) tumor motion on the PTV boundary...
May 25, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31129035/postmastectomy-radiotherapy-for-left-sided-breast-cancer-patients-comparison-of-advanced-techniques
#13
Yibo Xie, Daniel Bourgeois, Beibei Guo, Rui Zhang
Postmastectomy radiotherapy (PMRT) has been shown to improve the overall survival for invasive breast cancer patients, and many advanced radiotherapy technologies were adopted for PMRT. The purpose of our study is to compare various advanced PMRT techniques including fixed-beam intensity-modulated radiotherapy (IMRT), non-coplanar volumetric modulated arc therapy (NC-VMAT), multiple arc VMAT (MA-VMAT), and tomotherapy (TOMO). Results of standard VMAT and mixed beam therapy that were published by our group previously were also included in the plan comparisons...
May 23, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31079619/three-dimensional-printed-electron-beam-modifier-for-total-skin-electron-treatments
#14
S Diamantopoulos, I Kagkiouzis, G Patatoukas, E Kypraiou, V Kouloulias, E Efstathopoulos, K Platoni
Total Skin Electron Beam (TSEB) treatment, despite its proven effectiveness in skin malignancies, is a rather exhausting irradiation method, especially for feeble patients. In an effort to reduce treatment time by creating a clinically acceptable single TSEB field, various beam modifiers of different materials and shapes were tested. Using the TSEB immobilization device of our department and 3D printing technology, aluminum and thermoplastic modifiers were designed and constructed, according to the resulting profiles at treatment distance...
July 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31103251/dosimetric-and-radiobiological-comparison-of-prostate-vmat-plans-optimized-using-the-photon-and-progressive-resolution-algorithm
#15
James C L Chow, Runqing Jiang, Lu Xu
This study compared the dosimetric and radiobiological parameters of prostate volumetric modulated arc therapy (VMAT) plans using different prescriptions optimized by the photon optimization (PO) and progressive resolution optimization (PRO) algorithm. A total of 20 prostate patients were selected retrospectively and divided into 2 groups of VMAT plans using prescriptions of 60 Gy/20 fx and 79 Gy/38 fx. Inverse treatment planning optimized by the PO and PRO algorithm based on the dual-arc technique was carried out by the Eclipse treatment planning system...
May 15, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31101570/multicriteria-optimization-site-specific-class-solutions-for-vmat-plans
#16
Mariana Guerrero, Zachary Fellows, Pranshu Mohindra, Shahed Badiyan, Narottam Lamichhane, James W Snider, Shifeng Chen
Multicriteria optimization (MCO), a novel commercially available optimization method for IMRT and VMAT has the potential to improve treatment planning techniques and workflows. MCO allows planners and physicians to assess in real time the impact and tradeoffs between all clinical goals and organ constraints. We investigate the feasibility of a universal set of objectives and constraints for VMAT plans in different anatomical sites and the impact of involving the Physician in the navigation of the generated Pareto plans...
May 15, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31101571/variation-of-v-105-between-pre-and-postmerged-subfields-in-field-in-field-hypofractionated-breast-radiotherapy-plans
#17
Abhishek Dwivedi, Therese McGarry, Laura Bond, Joel K Braver, Nrusingh C Biswal
Hypofractionated whole-breast irradiation has emerged as a viable alternative to conventional fractionation. In the field-in-field forward planning technique, a merged plan with 2 to 4 segmental fields is the final plan delivered to the machine. As per the ASTRO guidelines for the hypofractionation regimen, the volume of breast tissue receiving V105% of the prescription dose should be less than 200 cc. However, we have noticed substantial changes to this volume (change in V105% between -55 cc and + 47.1 cc) after merging the subfields...
May 14, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/31101569/dosimetric-considerations-when-utilizing-venezia-capri-rotte-double-tandem-and-tandem-and-ring-with-interstitial-needles-for-the-treatment-of-gynecological-cancers-with-high-dose-rate-brachytherapy
#18
Erich Schnell, Spencer Thompson, Salahuddin Ahmad, Terence S Herman, Tania De La Fuente Herman
This work evaluated the difference in dosimetry of high dose rate (HDR) brachytherapy treatments between plans using advanced multichannel applicators and simplified base versions. Eighteen HDR patients treated using Interstitial Ring CT/MR Applicator Set (Elekta Brachytherapy, Netherlands) (TRN) (21 plans), CapriTM Applicator Set (Varian Medical Systems, Inc., Palo Alto, CA) (CC) (19 plans), Rotte Endometrial Applicator Set (Elekta Brachytherapy, Netherlands) (RDT) (18 plans), and the Advanced Gynecological Applicator Venezia (Vz) (Elekta Brachytherapy, Netherlands) (6 plans) were retrospectively reviewed...
May 14, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30995966/dosimetric-comparison-of-short-and-full-arc-in-spinal-ptv-in-volumetric-modulated-arc-therapy-based-craniospinal-irradiation
#19
Biplab Sarkar, Anusheel Munshi, Tharmarnadar Ganesh, Arjunan Manikandan, Bidhu K Mohanti
Since 2011 when it was first described, the volumetric-modulated arc therapy (VMAT) technique for craniospinal irradiation (CSI) has always seen the use of large arc lengths for the spine fields ranging from 200° to 360°. This study was aimed to do a dosimetric comparison between the large and shorter spinal arc for CSI. For a cohort of 10 patients, 2 VMAT CSI plans were created for each patient, one using the conventional full 360° arc (VMAT_FA) for the spine and the other using 100° posterior arc (VMAT_PA) for 23...
April 15, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://read.qxmd.com/read/30987867/comparison-of-2-methods-for-prediction-of-liver-dosimetric-indices-in-hepatocellular-cancer-imrt-planning
#20
Weijie Cui, Weihu Wang, Zhihui Hu, Jianrong Dai, Yexiong Li
To evaluate the performance of 2 methods predicting liver dosimetric indices for hepatocellular cancer patients treated with intensity modulated radiation therapy (IMRT). Two predicting methods were implemented to build correlation between geometric and dosimetric information of hepatocellular cancer IMRT plans. One method used Principle Component Analysis method to simplify information and Support Vector Machine (SVM) regression method to build correlation. The other method used a simple linear function to map volumes of certain regions to dosimetic indices...
April 12, 2019: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
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