Open Access. Powered by Scholars. Published by Universities.®
Social and Behavioral Sciences Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 6 of 6
Full-Text Articles in Social and Behavioral Sciences
Ropes Eye Plaque Dosimetry: Commissioning And Verification Of An Ophthalmic Brachytherapy Treatment Planning System, J Poder, N Annabell, M Geso, M Alqathami, S Corde
Ropes Eye Plaque Dosimetry: Commissioning And Verification Of An Ophthalmic Brachytherapy Treatment Planning System, J Poder, N Annabell, M Geso, M Alqathami, S Corde
Faculty of Engineering and Information Sciences - Papers: Part A
In this study, the Plaque SimulatorTM eye plaque brachytherapy planning system was commissioned for ROPES eye plaques and Amersham Health model 6711 Iodine 125 seeds, using TG43-UI data. The brachytherapy module of the RADCALC® independent checking program was configured to allow verification of the accuracy of the dose calculated by Plaque SimulatorTM. Central axis depth dose distributions were compared and observed to agree to within 2% for all ROPES plaque models and depths of interest. Experimental measurements were performed with a customized PRESAGEm 3-D type dosimeter to validate the calculated depth dose distributions. Preliminary results have shown the effect of …
Validation Of An Imrt Beam Model Using A Secondary Treatment Planning System As A 3d Dosimeter, A Xing, S Arumugam, L Holloway, G Goozee
Validation Of An Imrt Beam Model Using A Secondary Treatment Planning System As A 3d Dosimeter, A Xing, S Arumugam, L Holloway, G Goozee
Faculty of Engineering and Information Sciences - Papers: Part A
A treatment planning system IMRT beam model is usually validated using phantom-based measurement, however this will not detect errors related to patient anatomy and inhomogeneity. In this study a secondary treatment system (CMS XIO) was used as a 3D dosimeter to verify an IMRT beam model recently commissioned in a Philips Pinnacle treatment planning system. Data sets from three head-neck and two prostate patients previously treated were utilised. The IMRT plans for these patients were planned in Pinnacle and transferred to XIO. The dose at each voxel in the patient volume was calculated in both XIO and Pinnacle. The 2D …
Essential Elements In Tactical Planning Models For Container Liner Shipping, Shuaian Wang
Essential Elements In Tactical Planning Models For Container Liner Shipping, Shuaian Wang
Faculty of Engineering and Information Sciences - Papers: Part A
Tactical planning models for liner shipping problems such as network design and fleet deployment usually minimize the total cost or maximize the total profit subject to constraints including ship availability, service frequency, ship capacity, and transshipment. Most models in the literature do not consider slot-purchasing, multi-type containers, empty container repositioning, or ship repositioning, and they formulate the numbers of containers to transport as continuous variables. This paper develops a mixed-integer linear programming model that captures all these elements. It further examines from the theoretical point of view the additional computational burden introduced by incorporating these elements in the planning model. …
Path Planning With A Lazy Significant Edge Algorithm (Lsea), Joseph Polden, Zengxi Pan, Nathan Larkin, Stephen Van Duin
Path Planning With A Lazy Significant Edge Algorithm (Lsea), Joseph Polden, Zengxi Pan, Nathan Larkin, Stephen Van Duin
Faculty of Engineering and Information Sciences - Papers: Part A
Probabilistic methods have been proven to be effective for robotic path planning in a geometrically complex environment. In this paper, we propose a novel approach, which utilizes a specialized roadmap expansion phase, to improve lazy probabilistic path planning. This expansion phase analyses roadmap connectivity information to bias sampling towards objects in the workspace that have not yet been navigated by the robot. A new method to reduce the number of samples required to navigate narrow passages is also proposed and tested. Experimental results show that the new algorithm is more efficient than the traditional path planning methodologies. It was able …
The Potential For An Enhanced Role For Mri In Radiation-Therapy Treatment Planning, P Metcalfe, G P. Liney, L Holloway, A Walker, M Barton, G P. Delaney, S Vinod, W Tome
The Potential For An Enhanced Role For Mri In Radiation-Therapy Treatment Planning, P Metcalfe, G P. Liney, L Holloway, A Walker, M Barton, G P. Delaney, S Vinod, W Tome
Faculty of Engineering and Information Sciences - Papers: Part A
The exquisite soft-tissue contrast of magnetic resonance imaging (MRI) has meant that the technique is having an increasing role in contouring the gross tumor volume (GTV) and organs at risk (OAR) in radiation therapy treatment planning systems (TPS). MRI-planning scans from diagnostic MRI scanners are currently incorporated into the planning process by being registered to CT data. The soft-tissue data from the MRI provides target outline guidance and the CT provides a solid geometric and electron density map for accurate dose calculation on the TPS computer. There is increasing interest in MRI machine placement in radiotherapy clinics as an adjunct …
I-125 Ropes Eye Plaque Dosimetry: Validation Of A Commercial 3d Ophthalmic Brachytherapy Treatment Planning System And Independent Dose Calculation Software With Gafchromic Ebt3 Films, Joel Poder, Stephanie Corde
I-125 Ropes Eye Plaque Dosimetry: Validation Of A Commercial 3d Ophthalmic Brachytherapy Treatment Planning System And Independent Dose Calculation Software With Gafchromic Ebt3 Films, Joel Poder, Stephanie Corde
Faculty of Engineering and Information Sciences - Papers: Part A
Purpose: The purpose of this study was to measure the dose distributions for different Radiation Oncology Physics and Engineering Services, Australia (ROPES) type eye plaques loaded with I-125 (model 6711) seeds using GafChromic R EBT3 films, in order to verify the dose distributions in the Plaque SimulatorTM (PS) ophthalmic 3D treatment planning system. The brachytherapy module of RADCALC R was used to independently check the dose distributions calculated by PS. Correction factors were derived from the measured data to be used in PS to account for the effect of the stainless steel ROPES plaque backing on the 3D dose distribution. …