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https://www.readbyqxmd.com/read/29205763/a-comparison-of-two-pencil-beam-scanning-treatment-planning-systems-for-proton-therapy
#1
Ulrich W Langner, Michelle Mundis, Dan Strauss, Mingyao Zhu, Sina Mossahebi
OBJECTIVE: Analytical dose calculation algorithms for Eclipse and Raystation treatment planning systems (TPS), as well as a Raystation Monte Carlo model are compared to corresponding measured point doses. METHOD: The TPS were modeled with the same beam data acquired during commissioning. Thirty-five typical plans were made with each planning system, 31 without range shifter and four with a 5 cm range shifter. Point doses in these planes were compared to measured doses...
December 4, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29176074/validation-and-uncertainty-analysis-of-a-pre-treatment-2d-dose-prediction-model
#2
Jose A Baeza, Cecile J A Wolfs, Sebastiaan M J J G Nijsten, Frank Verhaegen
Independent verification of complex treatment delivery with megavolt photon beam radiotherapy (RT) has been effectively used to detect and prevent errors. This work presents the validation and uncertainty analysis of a model that predicts 2D portal dose images without a patient or phantom in the beam. The prediction model is based on an exponential point dose model with separable primary and secondary photon fluence components. The model includes a scatter kernel, off-axis ratio map, transmission values and penumbra kernels for beam-delimiting components...
November 26, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29070960/validation-of-dosimetric-leaf-gap-dlg-prior-to-its-implementation-in-treatment-planning-system-tps-truebeam%C3%A2-millennium-120-leaf-mlc
#3
Ravindra Shende, Ganesh Patel
AIM: Objective of present study is to determine optimum value of DLG and its validation prior to being incorporated in TPS for Varian TrueBeam™ millennium 120 leaves MLC. BACKGROUND: Partial transmission through the rounded leaf ends of the Multi Leaf Collimator (MLC) causes a conflict between the edges of the light field and radiation field. Parameter account for this partial transmission is called Dosimetric Leaf Gap (DLG). The complex high precession technique, such as Intensity Modulated Radiation Therapy (IMRT), entails the modeling of optimum value of DLG inside Eclipse Treatment Planning System (TPS) for precise dose calculation...
November 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29022748/dependence-of-volume-calculation-and-margin-growth-accuracy-on-treatment-planning-systems-for-stereotactic-radiosurgery
#4
David J Eaton, Kevin Alty
OBJECTIVE: Uncertainties in radiotherapy target structures are partly dependent on differences between volume calculation and margin growing methods in treatment planning systems (TPS). These uncertainties are exacerbated with very small structures such as those common in stereotactic radiosurgery. METHODS: Data from a national commissioning programme for SRS was used to assess variation in reported volumes for six benchmark cases, including malignant and benign indications...
December 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28834112/the-role-of-ct-myelography-in-sparing-the-spinal-cord-during-definitive-radiotherapy-in-vertebral-hemangioma
#5
S P Sudha, M S Gopalakrishnan, K Saravanan
INTRODUCTION: The spinal cord is poorly visualized on CT images but is well visualized in MRI images. However, implants used for spinal stabilization can produce artifacts on the MRI images which can interfere with identification of the cord. CT myelography in conjunction with CT simulation helps to clearly delineate the cord. MATERIALS AND METHODS: CT simulation was done in a patient with vertebral hemangioma. Pre- and post myelography images were obtained. Two plans were generated on pre and post myelography CT images using Eclipse™ treatment planning system (TPS) version 10...
August 18, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28760507/use-of-a-second-dose-calculation-algorithm-to-check-dosimetric-parameters-for-the-dose-distribution-of-a-first-dose-calculation-algorithm-for-lung-sbrt-plans
#6
Yusuke Tsuruta, Mitsuhiro Nakamura, Yuki Miyabe, Manabu Nakata, Yoshitomo Ishihara, Nobutaka Mukumoto, Mami Akimoto, Tomohiro Ono, Shinsuke Yano, Kyoji Higashimura, Yukinori Matsuo, Takashi Mizowaki, Masahiro Hiraoka
PURPOSE: To verify lung stereotactic body radiotherapy (SBRT) plans using a secondary treatment planning system (TPS) as an independent method of verification and to define tolerance levels (TLs) in lung SBRT between the primary and secondary TPSs. METHODS: A total of 147 lung SBRT plans calculated using X-ray voxel Monte Carlo (XVMC) were exported from iPlan to Eclipse in DICOM format. Dose distributions were recalculated using the Acuros XB (AXB) and the anisotropic analytical algorithm (AAA), while maintaining monitor units (MUs) and the beam arrangement...
July 28, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28639942/commissioning-of-the-tongue-and-groove-modelling-in-treatment-planning-systems-from-static-fields-to-vmat-treatments
#7
Victor Hernandez, Juan Antonio Vera-Sánchez, Laure Vieillevigne, Jordi Saez
Adequate modelling of the multi-leaf collimator (MLC) by treatment planning systems (TPS) is essential for accurate dose calculations in intensity-modulated radiation-therapy. For this reason modern TPSs incorporate MLC characteristics such as the leaf end curvature, MLC transmission and the tongue-and-groove. However, the modelling of the tongue-and-groove is often neglected during TPS commissioning and it is not known how accurate it is. This study evaluates the dosimetric consequences of the tongue-and-groove effect for two different MLC models using both film dosimetry and ionisation chambers...
June 22, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28612590/treatment-planning-with-unflattened-as-compared-to-flattened-beams-for-bilateral-carcinoma-of-the-breast
#8
Suresh Tamilarasu, Madeswaran Saminathan, S K Sharma, Anjali P, Abhinav Dewan
Aim: To evaluate the plan quality of 6MV unflattened (UFB) and flattened beam (FB) photon energy using AAA dose calculation algorithms for volumetric arc therapy. Materials and Methods: Plans were generated for bilateral carcinoma of breast and the dose prescribed was 50.4Gy in 28 fractions. Two different plans were made for each patient using 6MV FB and 6MV UFB. Dose calculations were performed on an AAA dose calculation algorithm. Plans were generated on Eclipse TPS and were capable of being delivered with a true beam STx linear accelerator...
May 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28535921/out-of-field-in-vivo-dosimetry-using-tld-in-sabr-for-primary-kidney-cancer-involving-mixed-photon-fields
#9
P Lonski, S Keehan, S Siva, D Pham, R D Franich, M L Taylor, T Kron
PURPOSE: To assess out-of-field dose using three different variants of LiF thermoluminescence dosimeters (TLD) for ten patients who underwent stereotactic ablative body radiotherapy (SABR) for primary renal cell carcinoma (RCC) and compare with treatment planning system (TPS) dose calculations. METHODS AND MATERIALS: Thermoluminescent dosimeter (TLD) measurements were conducted at 20, 30, 40 and 50cm from isocentre on ten patients undergoing SABR for primary RCC...
May 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28508845/dosimetric-comparison-of-head-and-neck-cancer-patients-planned-with-multivendor-volumetric-modulated-arc-therapy-technology
#10
Murugesan Kathirvel, Vellaiyan Subramani, V S Subramanian, Shanmugam Thirumalai Swamy, Gandhi Arun, Subramanian Kala
AIM: Purpose of this study is to dosimetrically compare head and neck (H and N) cancer patients planned with multivendor volumetric modulated arc therapy (VMAT) technology. VMAT treatment planning can be done using biological (treatment planning system [TPSB]: Monaco) or physical (TPSP: Eclipse)-based cost function optimization techniques. Planning and dosimetric comparisons were done in both techniques for H and N cases. MATERIALS AND METHODS: Twenty H and N patients were retrospectively selected for this study...
January 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28470819/tuning-of-acurosxb-source-size-setting-for-small-intracranial-targets
#11
Stephen J Gardner, Siming Lu, Chang Liu, Ning Wen, Indrin J Chetty
This study details a method to evaluate the source size selection for small field intracranial stereotactic radiosurgery (SRS) deliveries in Eclipse treatment planning system (TPS) for AcurosXB dose calculation algorithm. Our method uses end-to-end dosimetric data to evaluate a total of five source size selections (0.50 mm, 0.75 mm, 1.00 mm, 1.25 mm, and 1.50 mm). The dosimetric leaf gap (DLG) was varied in this analysis (three DLG values were tested for each scenario). We also tested two MLC leaf designs (standard and high-definition MLC) and two delivery types for intracranial SRS (volumetric modulated arc therapy [VMAT] and dynamic conformal arc [DCA])...
May 4, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28338869/measurement-of-absorption-dose-outside-irradiation-field-in-imrt
#12
Makoto Hirata, Hajime Monzen, Kohei Hanaoka, Yasumasa Nishimura
The absorption dose outside the irradiation field for prostate intensity-modulated radiation therapy was measured and evaluated by comparison with calculated values of radiation treatment planning system (TPS). The values of TPS calculated were using Varian CLINAC21EX/Eclipse and TomoTherapy Planning System for constant irradiation time. The absorption dose was measured by placing a glass-element dosemeter in a human-bone enclosure phantom with a planning target volume inside the irradiation field. The organs at risk were the rectum, spinal cord, thyroid, eyeball and the left lung...
March 3, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28297459/on-the-use-of-a-convolution-superposition-algorithm-for-plan-checking-in-lung-stereotactic-body-radiation-therapy
#13
Nicholas Hardcastle, Bradley M Oborn, Annette Haworth
Stereotactic body radiation therapy (SBRT) aims to deliver a highly conformal ablative dose to a small target. Dosimetric verification of SBRT for lung tumors presents a challenge due to heterogeneities, moving targets, and small fields. Recent software (M3D) designed for dosimetric verification of lung SBRT treatment plans using an advanced convolution-superposition algorithm was evaluated. Ten lung SBRT patients covering a range of tumor volumes were selected. 3D CRT plans were created using the XiO treatment planning system (TPS) with the superposition algorithm...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297432/difference-in-dose-volumetric-data-between-the-analytical-anisotropic-algorithm-the-dose-to-medium-and-the-dose-to-water-reporting-modes-of-the-acuros-xb-for-lung-stereotactic-body-radiation-therapy
#14
Wambaka A Mampuya, Mitsuhiro Nakamura, Yoshinori Hirose, Takashi Ishigaki, Takashi Mizowaki, Masahiro Hiraoka
The purpose of this study was to evaluate the difference in dose-volumetric data between the analytical anisotropic algorithms (AAA) and the two dose reporting modes of the Acuros XB, namely, the dose to water (AXB-Dw) and dose to medium (AXB-Dm) in lung stereotactic body radiotherapy (SBRT). Thirty-eight plans were generated using the AXB-Dm in Eclipse Treatment Planning System (TPS) and then recalculated with the AXB-Dw and AAA, using identical beam setup. A dose of 50 Gy in 4 fractions was prescribed to the isocenter and the planning target volume (PTV) D95%...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297427/a-comparative-study-of-identical-vmat-plans-with-and-without-jaw-tracking-technique
#15
Hao Wu, Fan Jiang, Haizhen Yue, Qiaoqiao Hu, Jian Zhang, Zhuolun Liu, Jian Gong, Sha Li, Jianhao Geng, Yibao Zhang
The unwanted radiation transmission through the multileaf collimators could be reduced by the jaw tracking technique which is commercially available on Varian TrueBeam accelerators. On the basis of identical plans, this study aims to investigate the dosimetric impact of jaw tracking on the volumetric-modulated arc therapy (VMAT) plans. Using Eclipse treatment planning system (TPS), 40 jaw-tracking VMAT plans with various tumor volumes and shapes were optimized. Fixed jaw plans were created by editing the jaw coordinates of the jaw-tracking plans while other parameters were identical...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297342/in-house-quality-check-of-external-beam-plans-using-3d-treatment-planning-systems-a-dvh-comparison
#16
Ayyalasomayajula Anil Kumar, Roopa Rani Akula, Komanduri Ayyangar, Reddy P Krishna, Srinivas Vuppu, P V Lakshmi Narayana, A Durga Prasada Rao
This paper presents a new approach towards the quality assurance of external beam plans using in-house-developed DICOM import and export software in a clinical setup. The new approach is different from what is currently used in most clinics, viz., only MU and point dose are verified. The DICOM-RT software generates ASCII files to import/export structure sets, treatment beam data, and dose-volume histograms (DVH) from one treatment planning system (TPS) to the other. An efficient and reliable 3D planning system, ROPS, was used for verifying the accuracy of treatment plans and treatment plan parameters...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297306/epid-based-dosimetry-to-verify-imrt-planar-dose-distribution-for-the-as1200-epid-and-fff-beams
#17
Narges Miri, Peter Keller, Benjamin J Zwan, Peter Greer
We proposed to perform a basic dosimetry commissioning on a new imager system, the Varian aS1200 electronic portal imaging device (EPID) and TrueBeam 2.0 linear accelerator for flattened (FF) and flattening filter-free (FFF) beams, then to develop an image-based quality assurance (QA) model for verification of the system delivery accuracy for intensity-modulated radiation therapy (IMRT) treatments. For dosimetry testing, linearity of dose response with MU, imager lag, and effectiveness of backscatter shielding were investigated...
November 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297277/application-programming-in-c-environment-with-recorded-user-software-interactions-and-its-application-in-autopilot-of-vmat-imrt-treatment-planning
#18
Henry Wang, Lei Xing
An autopilot scheme of volumetric-modulated arc therapy (VMAT)/intensity-modulated radiation therapy (IMRT) planning with the guidance of prior knowledge is established with recorded interactions between a planner and a commercial treatment planning system (TPS). Microsoft (MS) Visual Studio Coded UI is applied to record some common planner-TPS interactions as subroutines. The TPS used in this study is a Windows-based Eclipse system. The interactions of our application program with Eclipse TPS are realized through a series of subroutines obtained by prerecording the mouse clicks or keyboard strokes of a planner in operating the TPS...
November 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297273/the-dosimetric-impact-of-control-point-spacing-for-sliding-gap-mlc-fields
#19
Benjamin J Zwan, Jonathan Hindmarsh, Erin Seymour, Kankean Kandasamy, Kirbie Sloan, Rajesakar David, Christopher Lee
Dynamic sliding gap multileaf collimator (MLC) fields are used to model MLC properties within the treatment planning system (TPS) for dynamic treatments. One of the key MLC properties in the Eclipse TPS is the dosimetric leaf gap (DLG) and precise determination of this parameter is paramount to ensuring accurate dose delivery. In this investigation, we report on how the spacing between control points (CPs) for sliding gap fields impacts the dose delivery, MLC positioning accuracy, and measurement of the DLG...
November 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28291941/influence-of-the-jaw-tracking-technique-on-the-dose-calculation-accuracy-of-small-field-vmat-plans
#20
REVIEW
Ans C C Swinnen, Michel C Öllers, Erik Roijen, Sebastiaan M Nijsten, Frank Verhaegen
PURPOSE: The aim of this study was to evaluate experimentally the accuracy of the dose calculation algorithm AcurosXB in small field highly modulated Volumetric Modulated Arc Therapy (VMAT). METHOD: The 1000SRS detector array inserted in the rotational Octavius 4D phantom (PTW) was used for 3D dose verification of VMAT treatments characterized by small to very small targets. Clinical treatment plans (n = 28) were recalculated on the phantom CT data set in the Eclipse TPS...
January 2017: Journal of Applied Clinical Medical Physics
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