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Light-Dependent Resistors as Dosimetric Sensors in Radiotherapy

Juan Román-Raya, Isidoro Ruiz-García, Pablo Escobedo, Alberto J. Palma, Damián Guirado, Miguel A. Carvajal
2020 Sensors  
In this work, we present a well-known and low-cost semiconductor sensor, the light-dependent resistor (LDR), as an alternative to the existing sensing devices for dosimetry.  ...  Safe quality control of radiotherapy treatments lies in reliable dosimetric sensors.  ...  Materials and Methods Three commercial light-dependent resistor models have been characterized as dosimetric sensors for radiation X-ray beams typically used in radiotherapy.  ... 
doi:10.3390/s20061568 pmid:32168978 fatcat:qdiib474fveqtam4yvxiyqmw5y

Silicon Photomultipliers for Deep Tissue Cerenkov Emission Detection During External Beam Radiotherapy

Ibrahim Oraiqat, Samuel DeBruin, Robin Pearce, Christopher Como, Justin Mikell, Charles Taylor, John Way, Manuel Suarez, Alnawaz Rehemtulla, Roy Clarke, Issam El Naqa
2019 IEEE Photonics Journal  
Cerenkov Emission (CE) during external beam radiation therapy (EBRT) from a linear accelerator (Linac) has been demonstrated as a useful tool for radiotherapy quality assurance and potentially other applications  ...  similar to silicon photodiodes, allowing for improved flexibility in device design that may help in the process of wider clinical applicability.  ...  The choice of which adjacent pixel is light-blocked depends on the geometry of the measurement.  ... 
doi:10.1109/jphot.2019.2931845 pmid:33747354 pmcid:PMC7971172 fatcat:m5tjapqs4rdq3n6w5ukcymfkte

Comparison of Current–Voltage Response to Diagnostic X-rays of Five Light-Emitting Diode Strips

Edrine Damulira, Muhammad Nur Salihin Yusoff, Suharti Sulaiman, Nur Farah Huda Zulkafli, Nur Amiela Zulkifli, Nur Shahirah Ahmad Shakir, Mohamad Azlan Zainun, Ahmad Fairuz Omar, Nur Hartini Mohd Taib, Nik kamarullah Ya Ali
2019 Applied Sciences  
Overall results suggested cold white LED strip as most feasible for x-ray detection—in comparison to examined colors.  ...  Furthermore, LEDs have dual applicability as light emitters and detectors. This study explores the current–voltage (C–V) response of LED strips exposed to diagnostic x-rays.  ...  This strip comprises other electronic components such as resistors.  ... 
doi:10.3390/app10010200 fatcat:v2xws7rhhzci3e5hlabs6y5jxy

Optically Stimulated Luminescence Dosimeters in Clinical Practice [chapter]

Stephen F. Kry, Jennifer O'Daniel
2021 Radiation Therapy Dosimetry: A Practical Handbook  
Burgemeister, "Dosimetry with a diamond oper- ating as a resistor," Physics in Medicine and Biology 26 (2), 269-275 (1981). 9155/26/2/006 146. S. F. Kozlov, R.  ...  ., "A preliminary dosimetric characterization of chemical vapor deposition diamond detector prototypes in photon and electron radiotherapy beams," Medical Physics 32 (2), 389-395 (2005).  ...  Assurance and New Techniques in Radiation Medicine  ... 
doi:10.1201/9781351005388-7 fatcat:xpkppvd5n5h6dcm7gue22uvoau

Development of a PET cyclotron based irradiation setup for proton radiobiology

Sharif Ghithan, Paulo Crespo, S.J.C. do Carmo, Rui Ferreira Marques, F.A.F. Fraga, Hugo Simões, Francisco Alves, P.J.B.M. Rachinhas
2015 Journal of Instrumentation  
The team of LIP friends has been wonderful and I do believe that I have been a lucky PhD student, to have been involved in such a special environment.  ...  Acknowledgements I had the opportunity of working in a very exciting science environment at LIP -Laboratório de Instrumentação e Física Experimental de Partículas and at the Department of Physics, University  ...  As a result, the output voltage (V out), which is available across the load resistor R4, is proportional to the input frequency (F in).  ... 
doi:10.1088/1748-0221/10/02/p02010 fatcat:fksrc4ci5rai5i3gfwrox74gnm

An efficient and robust MRI-guided radiotherapy planning approach for targeting abdominal organs and tumours in the mouse

Veerle Kersemans, John S. Beech, Stuart Gilchrist, Paul Kinchesh, Philip D. Allen, James Thompson, Ana L. Gomes, Zenobia D'Costa, Luke Bird, Iain D. C. Tullis, Robert G. Newman, Aurelien Corroyer-Dulmont (+10 others)
2017 PLoS ONE  
We also acknowledge expert technical assistance from the Institute Mechanical and Electronics Workshops, animal facilities team and anyone else who contributed financially or in kind.  ...  All mice were housed in individual ventilated cages in a separate room with 12-h dark and light cycle maintained at 22˚C in 50% humidity.  ...  (C) Mean dose-volume histograms for a prescribed single dose of 8 Gy showing the dosimetric distribution of four radiotherapy plans (45˚Arc, 0˚beam, 30˚+60˚arc and 2x 120˚gantry arcs, respectively) to  ... 
doi:10.1371/journal.pone.0176693 pmid:28453537 pmcid:PMC5409175 fatcat:k5pjbjggfzfmrd6nx3c44em6j4

Measurement of absorbed dose to water for medium energy x rays

Karen Elizabeth Rosser
1996 Medical Physics (Lancaster)  
The second method of prevention is preferable as it does not require non water materials near the temperature sensor. .2 CONDUCTION OF HEAT IN A WATER CALORIMETER IRRADIATED WITH MEDIUM ENERGY X-RAYS  ...  The fixed resistors used in the bridge were high precision made by Vishay with a stability of 0.6 ppm/K.  ... 
doi:10.1118/1.597776 fatcat:37ntlajsm5eb3jgfymigcr6a7y

Thermal dosimetry for bladder hyperthermia treatment. An overview

Gerben Schooneveldt, Akke Bakker, Edmond Balidemaj, Rajiv Chopra, Johannes Crezee, Elisabeth D. Geijsen, Josefin Hartmann, Maarten C.C.M. Hulshof, H. Petra Kok, Margarethus M. Paulides, Alejandro Sousa-Escandon, Paul R. Stauffer (+1 others)
2016 International Journal of Hyperthermia  
The instrument determines the temperature of the sensor by measuring the decay time of its emitted light. This decay time is a persistent sensor property and it varies precisely with temperature.  ...  As outlined in section 4, which thermometry technique is most suitable depends on both the tumour type and the heating device.  ... 
doi:10.3109/02656736.2016.1156170 pmid:27132465 fatcat:muz7n7ltrrcvfoszyunmp4yfqi

Power pulsing of the CALICE tile hadron calorimeter

Mathias Reinecke
2016 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)  
Nevertheless, as a result of a series of innovative large experiments in the last 20 years, we have learnt a great deal about neutrinos.  ...  Much of what we know about neutrinos comes from studying neutrino flavour oscillations, whereby one type of neutrino transforms into a different type as it propagates over a large distance.  ...  It can be exploited with great advantage in the field of spectroscopic and high resolution X-ray imaging especially in case of new high-Z sensor materials such as GaAs, CdTe or CZT.  ... 
doi:10.1109/nssmic.2016.8069748 fatcat:zjgd7dmfdbhntb4kfwdtrlejhi

Retrospective and emergency dosimetry in response to radiological incidents and nuclear mass-casualty events: A review

I.K. Bailiff, S. Sholom, S.W.S. McKeever
2016 Radiation Measurements  
In this review we examine the application of these techniques in 'emergency' and 'retrospective' modes of operation that are conducted on two distinct timescales.  ...  , or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text  ...  Stepanenko for making available data used in Fig. 38 , to Dr N. Bougrov for graphical material used in Fig. 46 and to Dr V. Ramzaev for discussions related to his work in Novie Bobovichi.  ... 
doi:10.1016/j.radmeas.2016.09.004 fatcat:immax3dk4bgj5gqyvkdiesbuxq

New approach to neutron spectrometry with multi element scintillator

R. Machrafi, A.L. Miller, N. Khan
2015 Radiation Measurements  
Therefore, for dosimetric purposes, an acceptable neutron spectrometer can be developed by combining two neutron sensors in a single unit and along with mathematical algorithms; one can extract the dosimetric  ...  for neutron radiotherapy study.  ...  Using the CLYC scintillators that were studied in this thesis, a neutron detector can be developed to detect thermal as well as fast neutrons.  ... 
doi:10.1016/j.radmeas.2015.06.009 fatcat:dbv3zylmy5gkdfommltmcqm4gq

Development of a Prototype Synthetic Diamond Detector for Radiotherapy Dosimetry [article]

Gregory T. Betzel, University Of Canterbury
radiotherapy dosimetry.  ...  , high priming dose and dependence on dose rate.  ...  Dose rate dependence Material studies performed for diamond sensors in general complements radiotherapy diamond detector research.  ... 
doi:10.26021/7234 fatcat:cxnfvjhk2neppbzbwovv5xfjum

Visions for Radiation Dosimetry over the Next Two Decades -Strategic Research Agenda of the European Radiation Dosimetry Group: Version 2020 [article]

Jean-François Bottolier-Depois, Isabelle Clairand, Elena Fantuzzi, Paola Fattibene, Roger Harrison, Oliver Hupe, Pawel Olko, Veronika Olšovcová, Werner Rühm, Marco Silari, Rick Tanner, Filip Vanhavere (+1 others)
So improvement in dosimetric characteristics (energy, angular dependence) and field characterisation is needed.  ...  Challenge 4.1: To improve patient and ambient dosimetry in radiotherapy The optimisation of the dose delivered to the patient in radiotherapy depends on many factors, two of the most important being the  ... 
doi:10.12768/c55r-nf27 fatcat:purnzvdrbzbaxc44tzqnbqckni

Energy and wavelength scaling of shock-ignited inertial fusion targets

S Atzeni, A Marocchino, A Schiavi, G Schurtz
2013 New Journal of Physics  
We disucss how this kind of multiferrolectricity can be manipulated by imputrities and light pulses and show estimates of the effect in CuO.  ...  In the high-magnetic state non-collinearity and inversion symmetry breaking stabilize each other via the Dzyaloshinskii-Moriya interaction.  ...  The low-energy excitations in graphene depend on the interaction strength with the metal that serves as support [1, 2].  ... 
doi:10.1088/1367-2630/15/4/045004 fatcat:c4lh6z3uavbktgx4didzjqxoiy

Fibre Optics Approach to Dosimetry [article]

Kaidi Liang, University Of Canterbury
The refractive index change results in a shortening of the optical path length and as a result, light passing through the sample experiences a phase change.  ...  Phase information cannot be directly measured, as it is merely a property of light wave propagation, thus another technique must be used.  ...  The idea in this work is to use the phantom medium itself as a sensor, in which the dose is read by an optical approach with sufficient resolution for MRT purposes.  ... 
doi:10.26021/8500 fatcat:6t3htltv4faabjahl4bld75tim
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