Results 11 to 20 of about 1,800,736 (210)

Golden beam data for proton pencil-beam scanning [PDF]

Physics in Medicine and Biology, 2012
Proton, as well as other ion, beams applied by electro-magnetic deflection in pencil-beam scanning (PBS) are minimally perturbed and thus can be quantified a priori by their fundamental interactions in a medium. This a priori quantification permits an optimal reduction of characterizing measurements on a particular PBS delivery system.
Clasie, B., Depauw, N., Fransen, M.A.L.J., Goma, C., Panahandeh, H.R., Seco, J., Flanz, J.B., Kooy, H.M.   +7 more
openaire   +4 more sources

Contour scanning for penumbra improvement in pencil beam scanned proton therapy [PDF]

Physics in Medicine & Biology, 2017
Abstract Proton therapy, especially in the form of pencil beam scanning (PBS), allows for the delivery of highly conformal dose distributions for complex tumor geometries. However, due to scattering of protons inside the patient, lateral dose gradients cannot be arbitrarily steep, which is of importance in cases with organs at risk ...
Meier, G., Leiser, D., Besson, R., Mayor, A., Safai, S., Weber, D.C., Lomax, A.J.   +6 more
openaire   +4 more sources

Absolute dosimetry for FLASH proton pencil beam scanning radiotherapy

Scientific Reports, 2023
A paradigm shift is occurring in clinical oncology exploiting the recent discovery that short pulses of ultra-high dose rate (UHDR) radiation—FLASH radiotherapy—can significantly spare healthy tissues whilst still being at least as effective in curing ...
Ana Lourenço, Anna Subiel, Nigel Lee, Sam Flynn, John Cotterill, David Shipley, Francesco Romano, Joe Speth, Eunsin Lee, Yongbin Zhang, Zhiyan Xiao, Anthony Mascia, Richard A. Amos, Hugo Palmans, Russell Thomas   +14 more
doaj   +4 more sources

Beam Position Projection Algorithms in Proton Pencil Beam Scanning. [PDF]

Cancers (Basel)
Beam position uncertainties along the beam trajectory arise from the accelerator, beamline, and scanning magnets (SMs). They can be monitored in real time, e.g., through strip ionization chambers (ICs), and treatments can be paused if needed. Delivery is more reliable and accurate if the beam position is projected from monitored nozzle parameters to ...
Nesteruk KP, Bradley SG, Kooy HM, Clasie BM.   +3 more
europepmc   +4 more sources

Applications of various range shifters for proton pencil beam scanning radiotherapy [PDF]

Radiation Oncology, 2021
Background A range pull-back device, such as a machine-related range shifter (MRS) or a universal patient-related range shifter (UPRS), is needed in pencil beam scanning technique to treat shallow tumors.
Haibo Lin, Chengyu Shi, Sheng Huang, Jiajian Shen, Minglei Kang, Qing Chen, Huifang Zhai, James McDonough, Zelig Tochner, Curtiland Deville, Charles B. Simone, Stefan Both   +11 more
doaj   +5 more sources

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   +2 more sources

Dual X-ray absorptiometry: a comparison between fan beam and pencil beam scans

The British Journal of Radiology, 1993
Abstract The recent introduction of dual X-ray absorptiometry (DXA) systems with fan beam instead of conventional pencil beam scanning geometry represents a significant technical advance in bone densitometry. This report describes phantom and in-vivo studies of the effect of the change in beam configuration on DXA measurements.
Blake, G M, Parker, J C, Buxton, F M, Fogelman, I   +3 more
core   +5 more sources

Contour scanning, multi-leaf collimation and the combination thereof for proton pencil beam scanning

Physics in Medicine & Biology, 2018
Abstract In proton therapy, the lateral fall-off is often used to spare critical organs. It is therefore crucial to improve the penumbra for proton pencil beam scanning. However, previous work has shown that collimation may not be necessary for depths of  >15 cm in water.
Winterhalter, Carla, Meier, Gabriel, Oxley, David, Weber, Damien C., Lomax, Antony J., Safai, Sairos   +5 more
openaire   +5 more sources

A two-stage framework for fast proton spot map generation in pencil beam scanning prostate SBRT planning. [PDF]

Med Phys
Abstract Background In pencil beam scanning (PBS) proton therapy, treatment plans are encoded as proton spot maps (PSMs). Although deep‐learning methods can rapidly predict three‐dimensional (3D) dose distributions from patient anatomy and planning intent, there is still no widely adopted direct, non‐iterative approach to convert doses into physically ...
Tang X, Tseung HWC, Pepin M, Ma J, Routman DM, Moseley DJ, Reber B, Johnson JE, Qian J.   +8 more
europepmc   +2 more sources

Characterization of passive dosimeters in proton pencil beam scanning – A EURADOS intercomparison for mailed dosimetry audits in proton therapy centres

, 2021
The lack of mailed dosimetry audits of proton therapy centres in Europe has encouraged researchers of EURADOS Working Group 9 (WG9) to compare response of several existing passive detector systems in therapeutic pencil beam scanning.
Wochnik, A., Majer, M., Michalec, B., RENIERS, Brigitte, Pyszka, E., Angelis, C. De, Parisi, A., Vanhavere, F., Kopec, R., Olko, P., -Hubert, M. De Saint, Stolarczyk, L., Knezevic, Z., Foltynska, G., Swakon, J., Harrison, R. M.   +15 more
core   +4 more sources