A5068332921- Advanced Radiotherapy Techniques
- Glioma Diagnosis and Treatment
- Medical Imaging Techniques and Applications
- Radiation Therapy and Dosimetry
- Radiation Dose and Imaging
- Brain Metastases and Treatment
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Astronomy and Astrophysical Research
- Meningioma and schwannoma management
- Management of metastatic bone disease
- Radiation Effects and Dosimetry
- Radiation Detection and Scintillator Technologies
- Endometrial and Cervical Cancer Treatments
- Atmospheric Ozone and Climate
- Head and Neck Surgical Oncology
- Breast Cancer Treatment Studies
- Head and Neck Cancer Studies
- Radiation Effects in Electronics
- Advanced X-ray and CT Imaging
- Adaptive optics and wavefront sensing
- Infrared Thermography in Medicine
- Nuclear physics research studies
- Advanced Optical Sensing Technologies
Medisch Centrum Haaglanden
2008-2021
Netherlands Nutrition Centre
2010-2014
Rotterdam University of Applied Sciences
1995-2000
University of Mons
1987
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 leaf trajectory calculation dynamic collimation, which fully avoids these underdosage effects, presented. The based on pairwise synchronizations trajectories pairs, such that the delivered beam intensity each region always equal...
An algorithm for the calculation of required leaf trajectories to generate optimized intensity modulated beam profiles by means dynamic multileaf collimation is presented. This iteratively accounts transmission and collimator scatter fully avoids tongue-and-groove underdosage effects. Tests on a large number fields show that only limited iterations, generally less than 10, are necessary minimize differences between realized fluence profiles. To assess accuracy in combination with dose...
The aim of this work is to evaluate dosimetric accuracy a new treatment modality, HybridArc, in iPlan RT Dose 4.5 (BrainLAB, Feldkirchen, Germany) using four-dimensional diode array (ArcCHECK, Sun Nuclear Corporation, Melbourne, USA). HybridArc able enhance dynamic conformal arcs with inversely planned elements. plans for various sites (intracranial and extracranial) were constructed after that these recalculated the ArcCHECK Monte Carlo (MC) Pencil Beam (PB) dose algorithms Dose. All...
This study presents data for verification of the iPlan RT Monte Carlo (MC) dose algorithm (BrainLAB, Feldkirchen, Germany). MC calculations were compared with pencil beam (PB) and measurements in phantoms lung-equivalent material, air cavities or bone-equivalent material to mimic head neck thorax an Alderson anthropomorphic phantom. Dosimetric accuracy micro-multileaf collimator (MLC) simulation was tested a homogeneous All performed using ionization chamber Kodak EDR2 films Novalis 6 MV...
Recently, Siemens has introduced its Virtual Wedge (VW). On a Mevatron accelerator, this option generates wedge-like dose profile by moving collimator jaw at constant speed while varying the rate. In paper formalism is given that used to deliver wedge and from expressions for possible combinations of angle, field size delivered MUs are derived. Also time needed VW calculated.
Reproducible patient positioning is important in radiotherapy (RT) of head-and-neck cancer. We therefore compared set-up errors RT resulting from three different systems. Patients were either treated with a standard head support (SHS) and conventional treatment couch (SHS-3, n = 10), SHS rotational (SHS-6, or an individual (IHS) (IHS-6, 10). Interfraction mean translation vector lenghts significantly lower for IHS-6 to SHS-3 (0.8 ± 0.3 mm vs. 1.4 0.7 mm, P 0.001). Intrafraction displacement...
O Haas London: Springer (1999) 220pp, price: £37.50, ISBN: 0-85233-063-5 Probably not many readers of Physics in Medicine and Biology will have a book from this series on their shelf. It is monograph the 'Advances Industrial Control'. This also field expertise where author appears to come from. probably explains some slips pen, for example title X-axes dose-volume histograms that are consequently named '% depth dose'. Though lists number groups whom would be interesting, frankly, I am sure...
There is no consensus on a target definition and optimal dose in radiotherapy for atypical meningioma (AM). Insight into the postradiotherapy recurrence pattern needed local control. The objective was to describe patterns of after postoperative or salvage patients with AM.A retrospective analysis conducted treated intracranial AM (fractionated) stereotactic (FSRT). relationships between recurrences, dura irradiated volume were established. Moreover, prescriptions fractionation schedules...
view Abstract Citations (14) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The First UV Spectrum of Triton: IUE Observations from 2600 to 3200 Angstrom Stern, S. Alan ; Skinner, T. E. Brosch, N. van Santvoort, J. Trafton, L. M. results the first observations Triton's spectrum below 3300 A are reported. 2700 geometric albedo is found be 0.28 + or - 0.04. increases monotonically A, with a slope 0.13 0.03 per 1000 A. This positive qualitatively...
view Abstract Citations (6) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The UV Spectrum of Pluto-Charon: IUE Observations from 2600 to 3100 Stern, S. A. ; Skinner, T. E. Brosch, N. van Santvoort, J. Trafton, L. M. the spectra Pluto-Charon system were obtained between 1987 and 1988 using large aperture long-wavelength prime spectrograph. At resolution SNR data, no gas-phase spectral identifications made. present data indicate a geometric...
Purpose or ObjectiveWith the increasing use of Stereotactic Body Radiation Therapy (SBRT) combined with VMAT technique complexity treatments has increased significantly.Now dose distributions are less homogenous than 3DCRT and gradients higher.We need to calculate measure these as accurately possible.The first objective this work is compare measured two commercial array detectors against calculated in Monaco TPS.The second evaluate influence grid spacing used TPS calculation for SRS1000...
Purpose: To find out whether tantalum surgical clips can be used for online position verification in treatment of the lumpectomy cavity (LC) breast cancer patients. Tantalum is a high density metal that could visible on Electronic Portal Images (EPIs) and an affordable alternative to gold markers. Clips are considered more representative LC than nearby bony structures. Methods: In twelve patients surgeon had placed 2 5 LC. The AP lateral fields portal imaging, were adapted. doing so, both...