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4 results on '"Rob J. W. Louwe"'

1. The NCS code of practice for the quality assurance and control for volumetric modulated arc therapy

Author

D. Schuring, Anton Mans, J.W.H. Wolthaus, Cornelia A. J. M. Vugts, Marjan Admiraal, Heidi Lotz, Jeroen B. van de Kamer, Mark P. Arends, Rob J. W. Louwe, Michel Öllers, Radiation Oncology, Radiotherapie, RS: FHML non-thematic output, and RS: GROW - R3 - Innovative Cancer Diagnostics & Therapy

Subjects
medicine.medical_specialty, Quality management, Quality Assurance, Health Care, Control (management), quality assurance, PATIENT, 030218 nuclear medicine & medical imaging, volumetric modulated arc therapy, 03 medical and health sciences, DELIVERY, 0302 clinical medicine, VMAT QA, RADIATION-THERAPY, medicine, Dosimetry, Humans, Radiology, Nuclear Medicine and imaging, Medical physics, Radiation treatment planning, Radiometry, GAMMA INDEX, Radiological and Ultrasound Technology, business.industry, code of practice, Radiotherapy Planning, Computer-Assisted, IONIZATION-CHAMBER, Radiotherapy Dosage, IMRT QA, Patient specific, DOSIMETRY, Volumetric modulated arc therapy, RAPIDARC, 030220 oncology & carcinogenesis, Practice Guidelines as Topic, Code of practice, Radiotherapy, Intensity-Modulated, business, Quality assurance, Algorithms, FILM
Abstract

In 2010, the NCS (Netherlands Commission on Radiation Dosimetry) installed a subcommittee to develop guidelines for quality assurance and control for volumetric modulated arc therapy (VMAT) treatments. The report (published in 2015) has been written by Dutch medical physicists and has therefore, inevitably, a Dutch focus. This paper is a condensed version of these guidelines, the full report in English is freely available from the NCS website www.radiationdosimetry.org.After describing the transition from IMRT to VMAT, the paper addresses machine quality assurance (QA) and treatment planning system (TPS) commissioning for VMAT. The final section discusses patient specific QA issues such as the use of class solutions, measurement devices and dose evaluation methods.

Published
2016
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2. A Permanent Hole Burning Study of the FMO Antenna Complex of the Green Sulfur Bacterium Prosthecochloris aestuarii

Author

Rob J. W. Louwe, Eric M. Franken, Sieglinde Neerken, Thijs J. Aartsma, and Jan Amesz

Subjects
Conformational change, Materials science, Spectrophotometry, Infrared, Infrared Rays, Protein Conformation, Lasers, Dephasing, Photosynthetic Reaction Center Complex Proteins, Light-Harvesting Protein Complexes, chemistry.chemical_element, Dose-Response Relationship, Radiation, Photochemistry, Biochemistry, Molecular physics, Sulfur, Chlorobi, Absorbance, Wavelength, Bacterial Proteins, Energy Transfer, chemistry, Antenna (radio), Excitation, Line (formation)
Abstract

A permanent hole burning study on the Fenna-Matthews-Olson, or FMO, antenna complex of the green sulfur bacterium Prosthecochloris aestuarii was carried out at 6 K. Excitation resulted not only in relatively sharp features resonant with the burn wavelength but also in broad absorbance changes in the wavelength region of 800-820 nm. The shape of the latter changes was almost independent of the wavelength of excitation. Evidence is given that they are induced by a different mechanism than that which causes the resonant holes and that they may be due to a conformational change of the protein. The original spectrum was restored upon warming to 60 K. The effective dephasing times T2, as obtained from the homogeneous line widths, increased from about 0.5 ps at 803 nm to >/=20 ps at 830 nm and are in good agreement with recent measurements of accumulated photon-echo and time-resolved absorbance changes.

Published
1998
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3. Multi-institutional comparison of volumetric modulated arc therapy vs. intensity-modulated radiation therapy for head-and-neck cancer: a planning study

Author

Erik Ew Korevaar, M. Kunze-Busch, Mark P. Arends, Corine van Vliet-Vroegindeweij, Dirk Van Gestel, D. Schuring, Rob J. W. Louwe, and A. Holt

Subjects
Intensity-modulated radiation therapy, CARCINOMA, medicine.medical_treatment, Medizin, Multi-institutional collaboration, XEROSTOMIA, SmartArc, Planning study, medicine, Effective treatment, QUALITY, Humans, Simultaneous integrated boost, Radiology, Nuclear Medicine and imaging, IMRT, Patient comfort, Retrospective Studies, Contouring, PAROTID-GLAND FUNCTION, business.industry, Radiotherapy Planning, Computer-Assisted, Research, Head and neck cancer, Volumetric modulated arc therapy, Oropharyngeal Neoplasms -- radiotherapy, Radiotherapy Dosage, Sciences bio-médicales et agricoles, HELICAL TOMOTHERAPY, medicine.disease, Prognosis, Head-and-neck cancer, Radiation therapy, Cancérologie, stomatognathic diseases, Oropharyngeal Neoplasms, Oncology, Head and Neck Neoplasms -- radiotherapy, Radiology Nuclear Medicine and imaging, Head and Neck Neoplasms, Radiotherapy, Intensity-Modulated, Radiotherapy, Conformal, business, Nuclear medicine, CONVENTIONAL RADIOTHERAPY, Follow-Up Studies
Abstract

Compared to static beam Intensity-Modulated Radiation Therapy (IMRT), the main advantage of Volumetric Modulated Arc Therapy (VMAT) is a shortened delivery time, which leads to improved patient comfort and possibly smaller intra-fraction movements. This study aims at a treatment planner-independent comparison of radiotherapy treatment planning of IMRT and VMAT for head-and-neck cancer performed by several institutes and based on the same CT- and contouring data., info:eu-repo/semantics/published

Published
2012

4. The NCS code of practice for the quality assurance and control for volumetric modulated arc therapy.

Author

Anton Mans, Danny Schuring, Mark P Arends, Cornelia A J M Vugts, Jochem W H Wolthaus, Heidi T Lotz, Marjan Admiraal, Rob J W Louwe, Michel C Öllers, and Jeroen B Van De Kamer

Subjects
VOLUMETRIC-modulated arc therapy, QUALITY assurance, RADIATION dosimetry, RADIOTHERAPY, DOSE-effect relationship in pharmacology
Abstract

In 2010, the NCS (Netherlands Commission on Radiation Dosimetry) installed a subcommittee to develop guidelines for quality assurance and control for volumetric modulated arc therapy (VMAT) treatments. The report (published in 2015) has been written by Dutch medical physicists and has therefore, inevitably, a Dutch focus. This paper is a condensed version of these guidelines, the full report in English is freely available from the NCS website www.radiationdosimetry.org. After describing the transition from IMRT to VMAT, the paper addresses machine quality assurance (QA) and treatment planning system (TPS) commissioning for VMAT. The final section discusses patient specific QA issues such as the use of class solutions, measurement devices and dose evaluation methods. [ABSTRACT FROM AUTHOR]

Published
2016
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