Article
Radiology, Nuclear Medicine & Medical Imaging
Jasmine Duchaine, Daniel Markel, Hugo Bouchard
Summary: This study proposes an effective and precise method to correct the dose-rate dependence of silicon diode detectors in the context of clinical relative dosimetry.
Article
Chemistry, Inorganic & Nuclear
Lana Beck, Laura Ballisat, Sally Fletcher, Jaap Velthuis
Summary: We are developing a thin, real-time radiotherapy verification sensor called Athena, based on a large-scale MAPS technology. Its goal is to measure multileaf collimator positions and beam intensity for accurate and safe treatment delivery. Previous results have been published, and this paper presents new evidence showing that Athena does not saturate even at high beam intensities in a 6 FFF 10 x 10 cm2 field, making it suitable for clinical deployment.
APPLIED RADIATION AND ISOTOPES
(2023)
Article
Physics, Applied
Andrew Mueller, Emma E. E. Wollman, Boris Korzh, Andrew D. D. Beyer, Lautaro Narvaez, Ryan Rogalin, Maria Spiropulu, Matthew D. D. Shaw
Summary: Superconducting nanowire single-photon detectors (SNSPDs) are widely used for time correlated single photon counting in the near-infrared. However, high count rates can introduce increased timing jitter, which affects the accuracy of measurements. In this study, a calibration method is proposed to compensate for the timing variations caused by internal device properties and RF pulse characteristics. By applying corrections derived from the calibration process, the jitter at high count rates is significantly reduced, enabling faster operation for certain quantum communication protocols.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Hao Hao, Qing-Yuan Zhao, Ling-Dong Kong, Shi Chen, Hui Wang, Yang-Hui Huang, Jia-Wei Guo, Chao Wan, Hao Liu, Xue-Cou Tu, La-Bao Zhang, Xiao-Qing Jia, Jian Chen, Lin Kang, Cong Li, Te Chen, Gui-Xing Cao, Pei-Heng Wu
Summary: Photon number resolving is crucial for detectors in quantum and classical applications. By utilizing a matched filter and a cryogenic amplifier, the performance of series PNR-SNSPD can be improved, achieving a maximum resolved photon number of 65 or even larger.
APPLIED PHYSICS LETTERS
(2021)
Article
Oncology
Mari Partanen, Jarkko Niemela, Jarkko Ojala, Jani Keyrilainen, Mika Kapanen
Summary: The study investigated the properties of the Nano chamber for small-field dosimetry using measurements and MC simulations. Results showed that the Nano chamber is suitable for small field profile measurements down to 2 x 2 cm(2) and appropriate for PDD measurements. Correction factors and field output factors determined for the Nano chamber in TrueBeam fields demonstrated good accuracy and consistency.
Article
Engineering, Biomedical
Kevin Treb, Jeff Radtke, Wesley S. Culberson, Ke Li
Summary: In photon counting detectors, the accumulation of electric pulses induced by multiple x-ray photons can lead to count losses. This study introduces an inexpensive readout circuit element to collect time-integrated charge to correct for pile-up-induced count losses. Experimental results demonstrate that this correction method can restore the count accuracy of paralyzable photon counting detectors, without impacting the spatial resolution of the images.
PHYSICS IN MEDICINE AND BIOLOGY
(2023)
Article
Optics
Angelo Gulinatti, Francesco Ceccarelli, Massimo Ghioni, Ivan Rech
Summary: This paper presents a silicon technology for fabricating SPAD-arrays with low timing jitter and high detection efficiency, particularly in red and near infrared wavelengths. The results could potentially lead to exciting developments in various fields, ranging from quantum optics to single molecule spectroscopy.
Article
Engineering, Biomedical
Emilie Jean, Francois Therriault-Proulx, Luc Beaulieu
Summary: This study presented the HYPERSCINT research platform for multi-point dosimetry using a hyperspectral approach and compared its optical and dosimetric performances with the Ocean Optics QE65Pro spectrometer. The HYPERSCINT platform showed higher detection efficiency and better dosimetric measurements than the QE65Pro, including improved signal to noise ratio and signal to background ratio, surpassing even the performance of the Exradin W1 detector. The study also demonstrated accurate dose measurements within a small percentage deviation using the HYPERSCINT platform, while the Ocean Optics spectrometer showed significant discrepancies at lower doses.
PHYSICS IN MEDICINE AND BIOLOGY
(2021)
Review
Chemistry, Multidisciplinary
Andreas Pfenning, Sebastian Krueger, Fauzia Jabeen, Lukas Worschech, Fabian Hartmann, Sven Hoefling
Summary: Optical quantum information science and technologies require the ability to generate, control, and detect single or multiple quanta of light. Superconducting nanowire single-photon detectors and single-photon avalanche diodes are currently the top performers in this field, but other promising devices are emerging. This review article focuses on a specific alternative single-photon detector - the resonant tunneling diode - and discusses its advantages, limitations, and potential improvements.
Article
Nuclear Science & Technology
Tamon Kusumoto, Mark S. Akselrod, Jonathan Harrison, Satoshi Kodaira
Summary: This paper presents a calibration method for the fluorescence intensity of a fluorescent nuclear track detector (FNTD) using a confocal microscope. The coloration correction is based on the fluorescence intensity ratio of specific wavelengths and leads to a significant reduction in standard deviation for alpha particle detection.
RADIATION MEASUREMENTS
(2023)
Article
Engineering, Electrical & Electronic
Dennis Haag, Sebastian Schmidt, Patrick Hufschmidt, Gisela Anton, Rafael Ballabriga, Rolf Behrens, Michael Campbell, Franziska Eberle, Christian Fuhg, Oliver Hupe, Xavier Llopart, Jurgen Roth, Lukas Tlustos, Winnie Wong, Hayo Zutz, Thilo Michel
Summary: This study investigates the dosimetric properties of the hybrid, pixelated, photon-counting Dosepix detector in a pulsed photon field. The influence of pulse duration and dose rate on the detector's response is examined. The findings show that the response of the detector remains relatively constant when the pulse duration varies at a constant dose rate. Additionally, the response of the detector varies with different pixel sizes and dose rates, and there is a potential saturation of the count rate at high dose rates.
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Damian Czarnecki, Klemens Zink, Mohamad Alissa, Veronika Flatten, Teresa Espelage, Andreas A. Schoenfeld
Summary: This study investigated the ability of the IC Profiler detector array to measure photon beam quality and developed a Monte Carlo-based model for validation. The results showed that the Monte Carlo simulations were consistent with the measurements, demonstrating the reliability of the model. Furthermore, the model can be used for further research on the effects of beam parameter variations on AR ratios and %dd(10)x$_\textrm {{\it x}}$.
Article
Radiology, Nuclear Medicine & Medical Imaging
Mohamad Alissa, Klemens Zink, Frederic Tessier, Andreas A. Schoenfeld, Damian Czarnecki
Summary: This study aimed to calculate beam quality correction factors kQ for SNC600c and SNC125c ionization chambers, comparing the results with published kQ values for similar chambers, demonstrating a high level of agreement.
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
(2022)
Article
Chemistry, Physical
Wafa M. Al-Saleh, Richard P. Hugtenburg
Summary: This study models and validates a 6 MV Elekta linear accelerator, and compares the calculated and measured dose profiles in both in-field and out-of-field regions. By adjusting the length of jaws and materials of some head components, and including small head components in the model, the agreement with measurements is improved. However, discrepancies still exist in the out-of-field region from 40 to 60 cm, and the model underestimates the measured doses.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Anton N. Vetlugin, Filippo Martinelli, Shuyu Dong, Cesare Soci
Summary: Common methods for photon number resolution usually rely on fast single-photon detectors with on-off capability, combined with temporal or spatial mode multiplexing. However, these methods face a trade-off between the efficiency of photon number discrimination and detection rate. Here, we propose a photon number resolving detection method that replaces mode multiplexing with coherent absorption of a single optical mode in a distributed detector array, enabling fast and efficient photon number resolution. By increasing the number of detectors in the array, our proof-of-concept study shows that deterministic absorption and arbitrarily high photon number discrimination efficiency can be achieved. This method provides a simple yet effective approach for discriminating an arbitrary number of photons in large arrays of on-off detectors or smaller arrays of mode multiplexed detectors.
Article
Radiology, Nuclear Medicine & Medical Imaging
Robert W. Chuter, Philip A. Rixham, Steve J. Weston, Vivian P. Cosgrove
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS
(2016)
Article
Radiology, Nuclear Medicine & Medical Imaging
Richard J. Speight, Ashraf Esmail, Steve J. Weston
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS
(2011)
Article
Radiology, Nuclear Medicine & Medical Imaging
Daniel Johnson, Steven J. Weston, Vivian P. Cosgrove, David I. Thwaites
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS
(2014)
Article
Radiology, Nuclear Medicine & Medical Imaging
G. Cranmer-Sargison, S. Weston, J. A. Evans, N. P. Sidhu, D. I. Thwaites
Article
Radiology, Nuclear Medicine & Medical Imaging
C. M. Thompson, S. J. Weston, V. C. Cosgrove, D. I. Thwaites
Article
Radiology, Nuclear Medicine & Medical Imaging
D. Paynter, S. J. Weston, V. P. Cosgrove, J. A. Evans, D. I. Thwaites
Article
Radiology, Nuclear Medicine & Medical Imaging
S. M. Dawoud, S. J. Weston, I. Bond, G. C. Ward, P. A. Rixham, J. Mason, A. Huckle, J. R. Sykes
Article
Oncology
Gavin Cranmer-Sargison, Steve Weston, Narinder P. Sidhu, David I. Thwaites
RADIOTHERAPY AND ONCOLOGY
(2011)
Article
Engineering, Biomedical
Michael Pearson, Michael P. Barnes, Kirstie F. Brown, Karen Hawthorn, Simon W. Stevens, Rakesh Kizhakke Veetil, Steven Weston, J. R. Whitbourn
Summary: Radiotherapy linear accelerator vendors have developed their own integrated quality control systems, which have the potential to improve the quality and efficiency of linac QC. A survey of UK radiotherapy departments showed strong support for the use of these systems, with the majority finding them easy to use and reliable. However, there were inconsistencies in the utilization and commissioning tests performed, indicating a need for further guidance.
PHYSICS IN MEDICINE AND BIOLOGY
(2023)
Article
Oncology
MA Ebert, SF Zavgorodni, LA Kendrick, S Weston, CS Harper
INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS
(2001)
Article
Engineering, Biomedical
SJ Weston, ND MacDougall
PHYSICS IN MEDICINE AND BIOLOGY
(2000)
Article
Radiology, Nuclear Medicine & Medical Imaging
S. J. Weston, R. C. A. Thompson, A. M. Morgan
BRITISH JOURNAL OF RADIOLOGY
(2007)