Results 41 to 50 of about 4,358 (152)

Mapping initial and general recombination in scanning proton pencil beams

Physics in Medicine & Biology, 2020
Abstract The ion recombination is examined in parallel-plate ionization chambers in scanning proton beams at the Danish Centre for Particle Therapy and the Skandion Clinic. The recombination correction factor k s
J B Christensen, E Almhagen, L Stolarczyk, M Liszka, G G Hernandez, N Bassler, O Nørrevang, A Vestergaard   +7 more
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Innovations and the Use of Collimators in the Delivery of Pencil Beam Scanning Proton Therapy [PDF]

International Journal of Particle Therapy, 2021
The development of collimating technologies has become a recent focus in pencil beam scanning (PBS) proton therapy to improve the target conformity and healthy tissue sparing through field-specific or energy-layer-specific collimation. Given the growing popularity of collimators for low-energy treatments, the purpose of this work was to summarize the ...
Daniel E. Hyer, PhD, Laura C. Bennett, MS, Theodore J. Geoghegan, MS, Martin Bues, PhD, Blake R. Smith, PhD   +4 more
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ESTRO-EPTN radiation dosimetry guidelines for the acquisition of proton pencil beam modelling data

Physics and Imaging in Radiation Oncology
Proton therapy (PT) is an advancing radiotherapy modality increasingly integrated into clinical settings, transitioning from research facilities to hospital environments.
Carles Gomà, Katrin Henkner, Oliver Jäkel, Stefano Lorentini, Giuseppe Magro, Alfredo Mirandola, Lorenzo Placidi, Michele Togno, Marie Vidal, Gloria Vilches-Freixas, Jörg Wulff, Sairos Safai   +11 more
doaj   +1 more source

Dual-Layer Beamscanning Reflectarray Antenna Operating at Ku-Band

Journal of High-Frequency Communication Technologies, 2023
This paper presents a beam scanning electronically reconfigurable reflectarray configuration for Ku-band applications using a single varactor diode.  A 15×15 center-fed reconfigurable reflectarray antenna is designed consisting of 225 octagonal shaped ...
Vidhyashree Suresh, Aishika Bhattacharjee, Kirubaveni Savarimuthu   +2 more
doaj   +1 more source

Dual-Mode Sea Ice Extent Retrieval for the Rotating Fan Beam Scatterometer

Remote Sensing
Scatterometers are highlighted in polar applications, such as sea ice extent retrieval. There are currently three types of spaceborne scatterometer in operation, among which the rotating pencil beam scatterometer and the rotating fan beam scatterometer ...
Liling Liu, Xiaolong Dong, Wenming Lin, Shuyan Lang   +3 more
doaj   +1 more source

Beam-shape loss for multiple-beam digital array radars

The Journal of Engineering, 2019
This study considers beam-shape loss (BSL) for pencil-beam digital array radars (DARs), when multiple simultaneous receive beams are formed to cover the volume illuminated by each transmit beam.
Yuan Yao, Guangxin Wu
doaj   +1 more source

A systematic study of independently-tuned room-specific PBS beam model in a beam-matched multiroom proton therapy system

Radiation Oncology, 2021
Background In the existing application of beam-matched multiroom proton therapy system, the model based on the commissioning data from the leading treatment room was used as the shared model.
Yu-Hua Huang, Chunfeng Fang, Tao Yang, Lin Cao, Gaolong Zhang, Baolin Qu, Yihang Zhang, Zishen Wang, Shouping Xu   +8 more
doaj   +1 more source

Oxygen Depletion in Proton Spot Scanning: A Tool for Exploring the Conditions Needed for FLASH

Radiation, 2021
FLASH radiotherapy is a rapidly developing field which promises improved normal tissue protection compared to conventional irradiation and no compromise on tumour control.
Bethany C. Rothwell, Matthew Lowe, Norman F. Kirkby, Michael J. Merchant, Amy L. Chadwick, Ranald I. Mackay, Jolyon H. Hendry, Karen J. Kirkby   +7 more
doaj   +1 more source

Comparison of dosimetries of carbon-ion pencil beam scanning, proton pencil beam scanning and volumetric modulated arc therapy for locally recurrent rectal cancer

Journal of Radiation Research, 2022
Abstract We compared the dose distributions of carbon-ion pencil beam scanning (C-PBS), proton pencil beam scanning (P-PBS) and Volumetric Modulated Arc Therapy (VMAT) for locally recurrent rectal cancer. The C-PBS treatment planning computed tomography (CT) data sets of 10 locally recurrent rectal cancer cases were ...
Mori, Shinichiro, Bhattacharyya, Tapesh, Furuichi, Wataru, Tohyama, Naoki, Nomoto, Akihiro, Shinoto, Makoto, Takiyama, Hirotoshi, Yamada, Shigeru   +7 more
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Pitfalls in the beam modelling process of Monte Carlo calculations for proton pencil beam scanning [PDF]

The British Journal of Radiology, 2020
Objective: Monte Carlo (MC) simulations substantially improve the accuracy of predicted doses. This study aims to determine and quantify the uncertainties of setting up such a MC system. Methods: Doses simulated with two Geant4-based MC calculation ...
Winterhalter C, Aitkenhead A, Oxley D, Richardson J, Weber DC, MacKay RI, Lomax AJ, Safai S   +7 more
openaire   +3 more sources