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https://www.readbyqxmd.com/read/28383157/development-of-a-novel-low-radiation-absorbent-lok-bar-to-reduce-x-ray-scattering-and-absorption-in-rapidarc-%C3%A2-treatment-planning-and-dose-delivery
#1
Hajime Monzen, Kazuki Kubo, Mikoto Tamura, Masaru Hayakawa, Yasumasa Nishimura
We developed a novel low-radiation-absorbent lok-bar (HM-bar) that is used to secure the immobilizers to the couch. The aim of this study was to investigate the X-ray scattering and absorption properties of the HM-bar in computed tomography (CT) simulation and radiotherapy dose delivery using the Varian Exact™ lok-bar (VL-bar) as a benchmark. CT images were obtained with or without lok-bar, and then each image was visually evaluated for artifacts. The attenuation rates for each lok-bar were measured using a farmer-type ionization chamber (PTW30013) and the I'mRT phantom (IBA Dosimetry GmbH)...
April 6, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28350676/comparison-of-the-outcomes-of-complex-orbital-fracture-repair-with-and-without-a-surgical-navigation-system-a-prospective-cohort-study-with-historical-controls
#2
Emanuele Zavattero, Guglielmo Ramieri, Fabio Roccia, Giovanni Gerbino
BACKGROUND: In severe orbital fractures, restoration of orbital shape and volume is required to avoid diplopia and posttraumatic enophthalmos. The purpose of this study was to compare outcomes between navigation-aided and conventional techniques for complex unilateral orbital fractures using titanium mesh. METHODS: The outcomes and the computed tomography-measured orbital volume of two groups of orbital complex unilateral reconstruction cases were compared. The study group consisted of a consecutive cohort of unilateral severe orbital fracture that underwent surgery with the aid of a Brainlab navigation system...
April 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28348940/minimally-invasive-robotic-laser-corpus-callosotomy-a-proof-of-concept
#3
Harminder Singh, Walid I Essayed, Sayantan Deb, Caitlin Hoffman, Theodore H Schwartz
INTRODUCTION: We describe the feasibility of using minimally invasive robotic laser interstitial thermotherapy (LITT) for achieving an anterior two-thirds as well as a complete corpus callosotomy. METHODS: Ten probe trajectories were plotted on normal magentic resonance imaging (MRI) scans using the Brainlab Stereotactic Planning Software (Brainlab, Munich, Germany). The NeuroBlate® System (Monteris Medical, MN, USA) was used to conform the thermal burn to the corpus callosum along the trajectory of the probe...
February 10, 2017: Curēus
https://www.readbyqxmd.com/read/28320612/three-dimensional-image-fusion-of-18-f-fluorodeoxyglucose-positron-emission-tomography-computed-tomography-and-contrast-enhanced-computed-tomography-for-computer-assisted-planning-of-maxillectomy-of-recurrent-maxillary-squamous-cell-carcinoma-and-defect-reconstruction
#4
Yao Yu, Wen-Bo Zhang, Xiao-Jing Liu, Chuan-Bin Guo, Guang-Yan Yu, Xin Peng
PURPOSE: The purpose of this study was to describe new technology assisted by 3-dimensional (3D) image fusion of (18)F-fluorodeoxyglucose (FDG)-positron emission tomography (PET)/computed tomography (CT) and contrast-enhanced CT (CECT) for computer planning of a maxillectomy of recurrent maxillary squamous cell carcinoma and defect reconstruction. MATERIALS AND METHODS: Treatment of recurrent maxillary squamous cell carcinoma usually includes tumor resection and free flap reconstruction...
February 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28297354/quantitative-evaluation-of-patient-setup-uncertainty-of-stereotactic-radiotherapy-with-the-frameless-6d-exactrac-system-using-statistical-modeling
#5
Vance Keeling, Sabbir Hossain, Hosang Jin, Ozer Algan, Salahuddin Ahmad, Imad Ali
The purpose of this study is to evaluate patient setup accuracy and quantify individual and cumulative positioning uncertainties associated with different hardware and software components of the stereotactic radiotherapy (SRS/SRT) with the frameless 6D ExacTrac system. A statistical model is used to evaluate positioning uncertainties of the different components of SRS/SRT treatment with the Brainlab 6D ExacTrac system using the positioning shifts of 35 patients having cranial lesions. All these patients are immobilized with rigid head-and-neck masks, simulated with Brainlab localizer and planned with iPlan treatment planning system...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297341/assessment-of-monte-carlo-algorithm-for-compliance-with-rtog-0915-dosimetric-criteria-in-peripheral-lung-cancer-patients-treated-with-stereotactic-body-radiotherapy
#6
Damodar Pokhrel, Sumit Sood, Rajeev Badkul, Hongyu Jiang, Christopher McClinton, Christopher Lominska, Parvesh Kumar, Fen Wang
The purpose of the study was to evaluate Monte Carlo-generated dose distributions with the X-ray Voxel Monte Carlo (XVMC) algorithm in the treatment of peripheral lung cancer patients using stereotactic body radiotherapy (SBRT) with non-protocol dose-volume normalization and to assess plan outcomes utilizing RTOG 0915 dosimetric compliance criteria. The Radiation Therapy Oncology Group (RTOG) protocols for non-small cell lung cancer (NSCLC) currently require radiation dose to be calculated using tissue density heterogeneity corrections...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297328/a-preplanning-method-for-stereotactic-radiosurgery-to-improve-treatment-workflow
#7
Kang-Hyun Ahn, Naim Ozturk, Brett Smith, Konstantin V Slavin, Matthew Koshy, Bulent Aydogan
Frame-based stereotactic radiosurgery (SRS) requires fixation of an invasive head ring to ensure accurate targeting. Minimizing waiting time with a fixed head ring is important for patient comfort and satisfaction. We report a practical preplanning solution for the Brainlab iPlan treatment planning system that reduces waiting time by expediting the planning process on treatment day. A water-filled anthropomorphic head phantom was used to acquire a surrogate CT image set for preplanning and fused with patient's MRI, which was obtained before the day of treatment...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28283867/postoperative-neuroimaging-analysis-of-drt-deep-brain-stimulation-revision-surgery-for-complicated-essential-tremor
#8
Volker Arnd Coenen, Balint Varkuti, Yaroslav Parpaley, Sabine Skodda, Thomas Prokop, Horst Urbach, Meng Li, Peter Christoph Reinacher
BACKGROUND: We report a patient who received conventional bilateral deep brain stimulation of the ventral intermediate nucleus of thalamus (Vim) for the treatment of medication refractory essential tremor (ET). After initial beneficial effects, therapeutic efficacy was lost due to a loss of control of his proximal trunkal and extremity tremor. The patient received successful diffusion tensor magnetic resonance imaging fiber tractographic (DTI FT)-assisted DBS revision surgery targeting the dentato-rubro-thalamic tract (DRT) in the subthalamic region (STR)...
May 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28223014/calculation-of-resected-orbital-wall-areas-in-the-treatment-of-endocrine-orbitopathy
#9
Matthias Krause, Heike Hümpfner-Hierl, Daniel Kruber, Ina Sterker, Thomas Hierl
PURPOSE: Orbital wall decompression is routinely used to treat proptosis in endocrine orbitopathy. Until now, however, there has been no investigation to measure the area/extent of the removed walls. MATERIALS AND METHODS: The inner areas of 154 orbital walls (lateral, inferior, medial) which had been resected in 38 patients were measured using pre- and postsurgical computed tomographic data in Brainlab iPlan software. Furthermore the effect of concomitant centrolateral orbital rim advancement was calculated in 48 cases...
January 25, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28120086/does-navigation-improve-pedicle-screw-placement-accuracy-comparison-between-navigated-and-non-navigated-percutaneous-and-open-fixations
#10
Gualtiero Innocenzi, Simona Bistazzoni, Manuela D'Ercole, Giovanni Cardarelli, Francesco Ricciardi
BACKGROUND: The aim of our study was to assess how a preoperative computed tomography (CT)-based navigation system affected the correctness and safety of transpedicular screw insertion, compared with standard techniques. METHOD: Between January 2012 and February 2014, 203 patients underwent thoracic and lumbar fixation, with open and percutaneous techniques; 218 screws were implanted through an open navigated technique (1.0 Spine & Trauma 3d ver. 2.0 BrainLab, Feldkirchen Germany) in 43 patients; 220 screws were inserted with an open free-hand technique in 45 patients; 230 screws were implanted in 56 patients using percutaneous CT-based navigation; and 236 screws were inserted in 59 patients using a percutaneous fluoroscopy-guided technique...
2017: Acta Neurochirurgica. Supplement
https://www.readbyqxmd.com/read/28117632/clinical-outcomes-of-computer-assisted-total-knee-arthroplasty-using-pinless-navigation
#11
Lei Jiang, Jerry Yongqiang Chen, Hwei-Chi Chong, Shi-Lu Chia, Ngai-Nung Lo, Seng Jin Yeo
This study aims to evaluate the 2-year post-operative clinical outcomes of patients undergoing total knee arthroplasty (TKA) with computer-assisted surgery (CAS) using the pinless BrainLAB(®) VectorVision(®) Knee 2.5 Navigation System versus standard CAS. A retrospective case-control study of 200 patients who underwent TKA with CAS from 2008 to 2012 was conducted. Patients in the pinless arm underwent a shorter duration of surgery compared to the standard CAS arm with 72 ± 13 min and 83 ± 11 min, respectively ( p < 0...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28048932/th-b-204-03-tg-199-implanted-markers-for-radiation-treatment-verification
#12
Z Wang
Implanted markers as target surrogates have been widely used for treatment verification, as they provide safe and reliable monitoring of the inter- and intra-fractional target motion. The rapid advancement of technology requires a critical review and recommendation for the usage of implanted surrogates in current field. The symposium, also reporting an update of AAPM TG 199 - Implanted Target Surrogates for Radiation Treatment Verification, will be focusing on all clinical aspects of using the implanted target surrogates for treatment verification and related issues...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048898/mo-fg-brc-03-design-and-construction-of-a-dielectiric-wall-accelerator
#13
D Westerly
Experimental research in medical physics has expanded the limits of our knowledge and provided novel imaging and therapy technologies for patients around the world. However, experimental efforts are challenging due to constraints in funding, space, time and other forms of institutional support. In this joint ESTRO-AAPM symposium, four exciting experimental projects from four different countries are highlighted. Each project is focused on a different aspect of radiation therapy. From the USA, we will hear about a new linear accelerator concept for more compact and efficient therapy devices...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048478/th-b-204-01-real-time-tracking-with-implanted-markers
#14
Q Xu
Implanted markers as target surrogates have been widely used for treatment verification, as they provide safe and reliable monitoring of the inter- and intra-fractional target motion. The rapid advancement of technology requires a critical review and recommendation for the usage of implanted surrogates in current field. The symposium, also reporting an update of AAPM TG 199 - Implanted Target Surrogates for Radiation Treatment Verification, will be focusing on all clinical aspects of using the implanted target surrogates for treatment verification and related issues...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048255/su-d-brb-04-nomogram-for-prediction-comparison-and-evaluation-of-dose-to-normal-tissue-in-srs-planning
#15
A Templeton, Y Liao, A Diaz, J Turian
PURPOSE: Radiosurgery of brain metastases is a unique treatment planning subset in which the treatment approach, high conformality and steep dose gradients are relatively invariant with varying location, size and shape of the target. Prescription doses are generally limited by the size of tumor or amount of surrounding normal brain receiving intermediate doses. We tabulated our treatment plans to establish a nomogram which provides planning expectations, useful for patient scheduling, planning efficiency, and training purposes...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048246/mo-fg-brc-04-ionacoustic-imaging-for-particle-range-verification
#16
K Parodi
Experimental research in medical physics has expanded the limits of our knowledge and provided novel imaging and therapy technologies for patients around the world. However, experimental efforts are challenging due to constraints in funding, space, time and other forms of institutional support. In this joint ESTRO-AAPM symposium, four exciting experimental projects from four different countries are highlighted. Each project is focused on a different aspect of radiation therapy. From the USA, we will hear about a new linear accelerator concept for more compact and efficient therapy devices...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048209/su-f-p-55-testicular-scatter-dose-determination-during-prostate-sbrt-with-and-without-pelvic-lymph-nodes
#17
C Venencia, A Germanier, E Garrigo, P Castro Pena, J Torres, S Zunino
PURPOSE: The elective irradiation of pelvis lymph node for prostate cancer is still controversial. Including pelvic lymph node as part of the planning target volume could increase the testicular scatter dose, which could have a clinical impact. The objective of this work was to measure testicular scatter dose for prostate SBRT treatment with and without pelvic lymph nodes using TLD dosimetry. METHODS: A 6MV beam (1000UM/min) produce by a Novalis TX (BrainLAB-VARIAN) equipped HDMLC was used...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047909/tu-fg-201-07-development-of-srs-conical-collimator-collision-prediction-software-for-radiation-treatment-safety
#18
V Gutti, A Morrow, S Kim, M Patel
PURPOSE: Stereotactic radiosurgery (SRS) treatments using conical collimators can potentially result in gantry collision with treatment table due to limited collision-clear spaces. An in-house software was developed to help the SRS treatment planner mitigate potential SRS conical collimator (Varian Medical System, Palo Alto, CA) collisions with the treatment table. This software was designed to remove treatment re-planning secondary to unexpected collisions. METHODS: A BrainLAB SRS ICT Frameless Extension used for SRS treatments in our clinic was mathematically modelled using surface points registered to the 3D co-ordinate space of the couch extension...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047905/su-f-t-493-an-investigation-into-the-feasibility-of-using-pipspro-software-with-film-for-linac-qa
#19
R Underwood
PURPOSE: To determine the feasibility of using radiochromic and radiographic film with Pipspro software for quality assurance of linear accelerators with no on-board imaging. METHODS: The linear accelerator being used is a Varian Clinac 21EX. All IGRT is performed using the BrainLab ExacTrac system. Because of the lack of on board imaging, certain monthly and annual TG-142 quality assurance tests are more difficult to perform and analyze to a high degree of accuracy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047824/th-b-204-02-application-of-implanted-markers-in-proton-therapy
#20
S Park
Implanted markers as target surrogates have been widely used for treatment verification, as they provide safe and reliable monitoring of the inter- and intra-fractional target motion. The rapid advancement of technology requires a critical review and recommendation for the usage of implanted surrogates in current field. The symposium, also reporting an update of AAPM TG 199 - Implanted Target Surrogates for Radiation Treatment Verification, will be focusing on all clinical aspects of using the implanted target surrogates for treatment verification and related issues...
June 2016: Medical Physics
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