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146 results on '"B.J.M. Heijmen"'

56. OC-0299: Inconsistencies in clinicians‘ final treatment plan evaluations – a need for automation support

Author

A. Akhiat, Stefania Pallotta, Y. Seppenwoolde, Gregor Goldner, S. Wilson, Ann Henry, Marta Casati, Gabriele Simontacchi, Sebastiaan Breedveld, Livia Marrazzo, Peter W.J. Voet, Volker Steil, Frank Lohr, B.J.M. Heijmen, Roberto Pellegrini, J. Lilley, M. Milder, Dietmar Georg, Florian Stieler, J. Penninkhof, Pietro Bonomo, and D. Fransen

Subjects
Oncology, business.industry, Treatment plan, Computer science, Radiology, Nuclear Medicine and imaging, Operations management, Hematology, business, Automation
Published
2018

57. PO-0785: Automated VMAT planning for postoperative treatment of advanced gastric cancer

Author

Judit Boda-Heggemann, Daniel Buergy, Maarten L.P. Dirkx, Sebastiaan Breedveld, A.W. Sharfo, F. Wenz, O. Kupfer, B.J.M. Heijmen, Florian Stieler, and Frank Lohr

Subjects
medicine.medical_specialty, Oncology, business.industry, Postoperative treatment, Medicine, Radiology, Nuclear Medicine and imaging, Hematology, Advanced gastric cancer, business, Surgery
Published
2018

58. SP-0558: Automated planning and prediction models for bias-free treatment technique selection

Author

R. Bijman, B.J.M. Heijmen, Maarten L.P. Dirkx, Linda Rossi, Mischa S. Hoogeman, Sebastiaan Breedveld, A.W. Sharfo, and T. Arts

Subjects
Oncology, Computer science, business.industry, Radiology, Nuclear Medicine and imaging, Hematology, Artificial intelligence, business, Machine learning, computer.software_genre, computer, Selection (genetic algorithm), Predictive modelling
Published
2018

59. EP-1878: Fully automated multi-criterial VMAT plan optimization for prostate cancer whole-pelvic radiotherapy

Author

Martin Buschmann, Gregor Goldner, Dietmar Georg, J. Penninkhof, Y. Seppenwoolde, B.J.M. Heijmen, A.W. Sharfo, and Sebastiaan Breedveld

Subjects
Prostate cancer, medicine.medical_specialty, Oncology, Fully automated, business.industry, Medicine, Radiology, Nuclear Medicine and imaging, Whole pelvic radiotherapy, Hematology, Radiology, Plan (drawing), business, medicine.disease
Published
2018

60. SP-0666: Automated treatment planning - from theory to practice

Author

C. Timmermans, S.F. Petit, J. Penninkhof, B.J.M. Heijmen, and E. Venema

Subjects
0301 basic medicine, Management science, business.industry, Theory to practice, Hematology, 03 medical and health sciences, 030104 developmental biology, 0302 clinical medicine, Oncology, 030220 oncology & carcinogenesis, Medicine, Radiology, Nuclear Medicine and imaging, Radiation treatment planning, business
Published
2018

62. SP-0116: Automatic planning strategies

Author

Luca Incrocci, Peter W.J. Voet, Mischa S. Hoogeman, J. Penninkhof, Linda Rossi, S. Van de Water, B.J.M. Heijmen, Maarten L.P. Dirkx, A.W. Sharfo, Jan Willem M. Mens, A. Mendez Romero, D. Fransen, Sebastiaan Breedveld, and S.F. Petit

Subjects
Oncology, Radiology Nuclear Medicine and imaging, Radiology, Nuclear Medicine and imaging, Hematology
Published
2015
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63. SP-0619: PotD external beam: overview of current practice

Author

J. Penninkhof, Jan Willem M. Mens, A.P. Kanis, S.T. Heijkoop, R. Langerak, Sandra Quint, Mischa S. Hoogeman, A. Akhiat, and B.J.M. Heijmen

Subjects
Physics, Optics, Oncology, Current practice, business.industry, Radiology Nuclear Medicine and imaging, Radiology, Nuclear Medicine and imaging, Hematology, business, Beam (structure)
Published
2016
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64. OC-0461: Does the dosimetric advantage of prone setup persist in small-margin IMRT for gynecological cancer?

Author

S.T. Heijkoop, N. Van Wieringen, G.H. Westerveld, B.J.M. Heijmen, R. Feije, Lukas J.A. Stalpers, J.W.M. Mens, N. Bijker, Mischa S. Hoogeman, and A.W. Sharfo

Subjects
medicine.medical_specialty, business.industry, technology, industry, and agriculture, Hematology, equipment and supplies, Gynecological cancer, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Oncology, Margin (machine learning), Radiology Nuclear Medicine and imaging, 030220 oncology & carcinogenesis, biological sciences, otorhinolaryngologic diseases, Medicine, Radiology, Nuclear Medicine and imaging, natural sciences, Radiology, business
Published
2016
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66. OC-0267: Fully automated planning for non-coplanar CyberKnife prostate SBRT - comparison with automatic VMAT

Author

B.J.M. Heijmen, Linda Rossi, Shafak Aluwini, and Sebastiaan Breedveld

Subjects
medicine.medical_specialty, business.industry, Hematology, medicine.anatomical_structure, Oncology, Fully automated, Radiology Nuclear Medicine and imaging, Cyberknife, Prostate, Medicine, Radiology, Nuclear Medicine and imaging, Medical physics, business, Nuclear medicine, Non coplanar
Published
2016

67. OC-0251: Late toxicity in HYPRO randomized trial analyzed by automated planning and intrinsic NTCP modelling

Author

W. Schillemans, Luca Incrocci, Sebastiaan Breedveld, Floris J. Pos, B.J.M. Heijmen, R. Bijman, A.W. Sharfo, Maarten L.P. Dirkx, and Shafak Aluwini

Subjects
Oncology, medicine.medical_specialty, business.industry, Hematology, law.invention, Late toxicity, 03 medical and health sciences, 0302 clinical medicine, Randomized controlled trial, law, 030220 oncology & carcinogenesis, Internal medicine, medicine, Radiology, Nuclear Medicine and imaging, 030212 general & internal medicine, business
Published
2017

72. PO-0914: Knowledge-based automated VMAT Planning for liver metastases

Author

A.W. Sharfo, A. Mendez Romero, Sebastiaan Breedveld, Maarten L.P. Dirkx, and B.J.M. Heijmen

Subjects
medicine.medical_specialty, Oncology, business.industry, Radiology Nuclear Medicine and imaging, Track (disk drive), Medicine, Radiology, Nuclear Medicine and imaging, Medical physics, Hematology, business, Outcome (game theory)
Published
2015
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74. SP-0365: Coplanar and non-coplanar plan optimization in prostate SBRT

Author

Sebastiaan Breedveld, Shafak Aluwini, Linda Rossi, and B.J.M. Heijmen

Subjects
medicine.medical_specialty, medicine.anatomical_structure, Oncology, Radiology Nuclear Medicine and imaging, Computer science, Prostate, medicine, Radiology, Nuclear Medicine and imaging, Medical physics, Hematology, Plan (drawing), Non coplanar
Published
2015

75. OC-0431: Strongly reduced rectum dose for prostate treatment with non-coplanar beam setup of a Cyberknife equipped with an MLC

Author

B.J.M. Heijmen, Peter W.J. Voet, Sebastiaan Breedveld, Linda Rossi, and Shafak Aluwini

Subjects
medicine.medical_specialty, Materials science, business.industry, Rectum, Hematology, medicine.anatomical_structure, Oncology, Prostate, Cyberknife, Radiology Nuclear Medicine and imaging, medicine, Radiology, Nuclear Medicine and imaging, Medical physics, Nuclear medicine, business, Non coplanar, Beam (structure)
Published
2013
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77. Dynamic multileaf collimation without 'tongue-and-groove' underdosage effects

Author

B.J.M. Heijmen and J P C van Santvoort

Subjects
Male, Photons, Radiotherapy, Radiological and Ultrasound Technology, business.industry, Radiotherapy Planning, Computer-Assisted, Tongue and groove, Prostatic Neoplasms, Collimator, Models, Theoretical, Collimated light, law.invention, Multileaf collimator, Optics, law, Neoplasms, Trajectory, Humans, Dosimetry, Radiology, Nuclear Medicine and imaging, business, Microtron, Beam (structure), Mathematics
Abstract

In all commercially available multileaf collimators, a `tongue-and-groove' - or similar - construction is used for reduction of leakage radiation between adjacent leaves. These constructions can cause serious underdosages in intensity-modulated photon beams. A method for leaf trajectory calculation for dynamic multileaf collimation, which fully avoids these underdosage effects, is presented. The method is based on pairwise synchronizations of trajectories of adjacent leaf pairs, such that the delivered beam intensity in each `tongue-and-groove' region is always equal to the smallest of the two prescribed intensities for the two corresponding leaf pairs. The effectiveness of the method has been proven for a large number of intensity-modulated fields, using the dynamic multileaf collimation mode of our MM50 Racetrack Microtron. Compared to dynamic multileaf collimation without synchronization, beam-on times are always equal or longer. For the cases that we studied, the beam-on time was typically increased by 5 to 15%.

Published
1996

78. SU-F-J-105: Towards a Novel Treatment Planning Pipeline Delivering Pareto- Optimal Plans While Enabling Inter- and Intrafraction Plan Adaptation

Author

Sebastiaan Breedveld, Gijsbert H. Bol, Bas W. Raaymakers, B.J.M. Heijmen, J J W Lagendijk, C Kontaxis, and A.W. Sharfo

Subjects
Mathematical optimization, Iterative method, Pipeline (computing), Process (computing), Conventional treatment, General Medicine, Intensity-modulated radiation therapy, Radiation treatment planning, Imaging phantom
Abstract

Purpose: To develop a new IMRT treatment planning methodology suitable for the new generation of MR-linear accelerator machines. The pipeline is able to deliver Pareto-optimal plans and can be utilized for conventional treatments as well as for inter- and intrafraction plan adaptation based on real-time MR-data. Methods: A Pareto-optimal plan is generated using the automated multicriterial optimization approach Erasmus-iCycle. The resulting dose distribution is used as input to the second part of the pipeline, an iterative process which generates deliverable segments that target the latest anatomical state and gradually converges to the prescribed dose. This process continues until a certain percentage of the dose has been delivered. Under a conventional treatment, a Segment Weight Optimization (SWO) is then performed to ensure convergence to the prescribed dose. In the case of inter- and intrafraction adaptation, post-processing steps like SWO cannot be employed due to the changing anatomy. This is instead addressed by transferring the missing/excess dose to the input of the subsequent fraction. In this work, the resulting plans were delivered on a Delta4 phantom as a final Quality Assurance test. Results: A conventional static SWO IMRT plan was generated for two prostate cases. The sequencer faithfully reproduced the input dose for all volumes of interest. For the two cases the mean relative dose difference of the PTV between the ideal input and sequenced dose was 0.1% and −0.02% respectively. Both plans were delivered on a Delta4 phantom and passed the clinical Quality Assurance procedures by achieving 100% pass rate at a 3%/3mm gamma analysis. Conclusion: We have developed a new sequencing methodology capable of online plan adaptation. In this work, we extended the pipeline to support Pareto-optimal input and clinically validated that it can accurately achieve these ideal distributions, while its flexible design enables inter- and intrafraction plan adaptation. This research is financially supported by Elekta AB, Stockholm, Sweden.

Published
2016

79. PO-0950: QA and dummy-run results of the TRENDY randomized trial on SBRT vs. chemoembolization for HCC

Author

R. Weytjens, Onne Reerink, L. Depuydt, Stephanie Lang, W.F.A.R. Verbakel, A. Mendez Romero, M. Wendling, Tom Depuydt, Thomas Lacornerie, Enrica Seravalli, B.J.M. Heijmen, N. Van Wieringen, G.H. Westerveld, Oliver Riesterer, C.J.A. Haasbeek, Steven J. M. Habraken, Pètra M. Braam, Jeroen Buijsen, Karin Haustermans, Xavier Mirabel, and Michel Öllers

Subjects
Oncology, Randomized controlled trial, Radiology Nuclear Medicine and imaging, business.industry, law, Medicine, Radiology, Nuclear Medicine and imaging, Hematology, Nuclear medicine, business, law.invention
Published
2016

86. SP-0622: Statistical motion models for generating plan libraries

Author

Ludvig Paul Muren, S. Thörnqvist, Andras Zolnay, Liv Bolstad Hysing, B.J.M. Heijmen, Matthias Söhn, and Mischa S. Hoogeman

Subjects
Engineering drawing, Oncology, Computer science, Radiology, Nuclear Medicine and imaging, Hematology, Plan (drawing), Motion (physics)
Published
2014

87. PO-0769: Factors associated with hearing loss after LINAC-based stereotactic radiotherapy for vestibular schwannoma

Author

N. Hoekstra, R.M. Van Os, L. Stienstra, A.H.G. Dallenga, B.J.M. Heijmen, A. van Linge, John G. Wolbers, and A. Mendez Romero

Subjects
Vestibular system, medicine.medical_specialty, business.industry, Hearing loss, Hematology, Schwannoma, medicine.disease, Stereotactic radiotherapy, Oncology, Medicine, Radiology, Nuclear Medicine and imaging, Radiology, medicine.symptom, business
Published
2014

89. A Scintillating Triple GEM Beam Monitor for Radiation Therapy

Author

E. Loeff, C.E.W. van Eijk, E. Seravalli, R. Kreuger, A.. Simon, J.. Hendrikse, and B.J.M. Heijmen

Subjects
Physics, Physics::Instrumentation and Detectors, business.industry, medicine.medical_treatment, Electron, Intensity-modulated radiation therapy, Photon energy, Nuclear physics, Radiation therapy, Optics, medicine, Dosimetry, Gas detector, business, Astrophysics::Galaxy Astrophysics, Beam (structure), Voltage
Abstract

We report on the characterization of a gas detector, based on gas electron multipliers (GEMs), for use in intensity modulated radiation therapy (IMRT). The light emitted during the gas multiplication process in 1 atm Ar-CF4 (96-4) scintillating gas mixture has been studied as a function of applied voltages and treatment conditions such as beam time and photon energy

Published
2006

90. PD-0579: Voluntary breath-hold for breast cancer radiotherapy: is an intensive set-up correction protocol required?

Author

Margreet H.A. Baaijens, B.J.M. Heijmen, S. Poelert, M. ten Kley, M. Olofsen-van Acht, J. Penninkhof, and Sandra Quint

Subjects
Oncology, Protocol (science), medicine.medical_specialty, business.industry, Radiology Nuclear Medicine and imaging, Internal medicine, medicine, Radiology, Nuclear Medicine and imaging, Hematology, business, Set (psychology), Breast cancer radiotherapy
Published
2013
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91. Granulate of stainless steel as compensator material

Author

D. Binnekamp, J. van Santvoort, B.J.M. Heijmen, and Peter C. Levendag

Subjects
Radiotherapy, High-Energy, Wax, Materials science, Oncology, visual_art, visual_art.visual_art_medium, Reproducibility of Results, Radiotherapy Dosage, Radiology, Nuclear Medicine and imaging, Hematology, Composite material, Stainless Steel, Technology, Radiologic
Abstract

Compensators produced with computer controlled milling devices usually consist of a styrofoam mould, filled with an appropriate material. We investigated granulate of stainless steel as filling material. This cheap, easy to use, clean and re-usable material can be obtained with an average granule diameter of 0.3 mm, enabling an accurate and reproducible filling. No wax or other sealing material is added. The density of the granulate is approximately 4.5 g/cm3, which allows an accurate production of compensators in a sufficiently wide transmission range without the compensators becoming too thick. Transmission and surface dose measurements show that the dosimetric properties of stainless steel granulate are suitable for use as compensator material.

Published
1995

94. 1201 poster MARGIN-OF-THE-DAY: AN ONLINE ADAPTIVE STRATEGY FOR CERVICAL CANCER PATIENTS

Author

Jan Willem M. Mens, Rozilawati Ahmad, Sandra Quint, Luiza Bondar, Peter W.J. Voet, B.J.M. Heijmen, Mischa S. Hoogeman, and G. Dhawtal

Subjects
Cervical cancer, Oncology, medicine.medical_specialty, Adaptive strategies, business.industry, Margin (machine learning), Internal medicine, medicine, Radiology, Nuclear Medicine and imaging, Hematology, medicine.disease, business
Published
2011

96. EP-1672: Robustness of prostate pelvic IMRT: comparison of target delineation and target motion uncertainties on CTV dose

Author

S. Thörnqvist, B.J.M. Heijmen, S.I. Helle, Liv Bolstad Hysing, Ludvig Paul Muren, and Maria Thor

Subjects
medicine.medical_specialty, Computer science, business.industry, Hematology, Motion (physics), medicine.anatomical_structure, Oncology, Prostate, Robustness (computer science), medicine, Radiology, Nuclear Medicine and imaging, Computer vision, Medical physics, Artificial intelligence, business
Published
2014

98. OC-0366: Personalized non-rigid motion management for cervical cancer: Clinical evaluation of a plan of the day protocol

Author

M.L. Bondar, B.J.M. Heijmen, Sandra Quint, J.W.M. Mens, S.T. Heijkoop, Mischa S. Hoogeman, and Thomas Langerak

Subjects
Protocol (science), Cervical cancer, medicine.medical_specialty, business.industry, Hematology, Plan (drawing), medicine.disease, Oncology, medicine, Physical therapy, Radiology, Nuclear Medicine and imaging, Rigid motion, business, Clinical evaluation
Published
2014

100. OC-0388: Fully automated VMAT plan generation for prostate cancer patients

Author

Peter W.J. Voet, Luca Incrocci, Sebastiaan Breedveld, B.J.M. Heijmen, Maarten L.P. Dirkx, and A. Al Mamgani

Subjects
Prostate cancer, medicine.medical_specialty, Oncology, Fully automated, business.industry, medicine, Radiology, Nuclear Medicine and imaging, Medical physics, Hematology, Plan (drawing), medicine.disease, business
Published
2014

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