A mathematical formalism for hyperspectral, multipoint plastic scintillation detectors

Archambault, Louis; Therriault‐Proulx, François; Beddar, Sam; Beaulieu, Luc

doi:10.1088/0031-9155/57/21/7133

Cited by 49 publications

(102 citation statements)

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“…The extension of plastic scintillation dosimetry from one to multiple scintillating elements per optical probe was made possible with a mathematical formalism introduced by Archambault et al, 96 which allows for optical separation of the different light emitting elements that compose the total optical signal. A multipoint plastic scintillation detector (mPSD) using three scintillator elements (Figure 1) 18 A weighting function that accounts for the difference in signal-to-noise ratio between multiple measurement points was tested for BT source irradiations at source-todetector radial distances (r) from 1 to 5 cm and for a range over 10 cm along the longitudinal axis (z).…”

Section: Novel Dosimetry Technology Multipoint Dosemetersmentioning

confidence: 99%

In vivodosimetry: trends and prospects for brachytherapy

Kertzscher¹,

Rosenfeld²,

Beddar³

et al. 2014

BJR

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The error types during brachytherapy (BT) treatments and their occurrence rates are not well known. The limited knowledge is partly attributed to the lack of independent verification systems of the treatment progression in the clinical workflow routine. Within the field of in vivo dosimetry (IVD), it is established that real-time IVD can provide efficient error detection and treatment verification. However, it is also recognized that widespread implementations are hampered by the lack of available high-accuracy IVD systems that are straightforward for the clinical staff to use. This article highlights the capabilities of the state-of-the-art IVD technology in the context of error detection and quality assurance (QA) and discusses related prospects of the latest developments within the field. The article emphasizes the main challenges responsible for the limited practice of IVD and provides descriptions on how they can be overcome. Finally, the article suggests a framework for collaborations between BT clinics that implemented IVD on a routine basis and postulates that such collaborations could improve BT QA measures and the knowledge about BT error types and their occurrence rates.

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Section: Novel Dosimetry Technology Multipoint Dosemetersmentioning

confidence: 99%

In vivodosimetry: trends and prospects for brachytherapy

Kertzscher¹,

Rosenfeld²,

Beddar³

et al. 2014

BJR

View full text Add to dashboard Cite

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“…The part of the mPSD that was not inserted inside the catheter was made light-tight by covering it with a polyethylene jacket with an outside diameter of 2.2 mm, and the tip was covered with a 3-mm-long and 1-mm-diameter graphite and polyethylene cap. To enable implementation of the hyperspectral approach described by Archambault et al, 27 we FIG. 1.…”

Section: Iia the Detectormentioning

confidence: 99%

“…27,28 Therefore, any measured light spectrum (m) can be expressed as a linear superposition of the normalized spectral distribution (r) of all of its light components [see Eqs. (2) …”

Section: Iid Measuring the Dosementioning

confidence: 99%

“…The solution for x in this system of equations can be obtained by using the left pseudoinverse technique 27 and is given by…”

Section: Iid Measuring the Dosementioning

confidence: 99%

“…The theoretical and practical feasibility of developing a multipoint plastic scintillation detector (mPSD) that uses only a single collection optical guide was demonstrated recently for high-energy external beam radiation therapy. 27,28 The purpose of this study was to adapt such a detector for use in 192 Ir HDR brachytherapy and to investigate its potential as a real-time in vivo detector.…”

Section: Introductionmentioning

confidence: 99%

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On the use of a single‐fiber multipoint plastic scintillation detector for ¹⁹²Ir high‐dose‐rate brachytherapy

2013

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Purpose: The goal of this study was to prove the feasibility of using a single-fiber multipoint plastic scintillation detector (mPSD) as an in vivo verification tool during 192 Ir high-dose-rate brachytherapy treatments. Methods: A three-point detector was built and inserted inside a catheter-positioning template placed in a water phantom. A hyperspectral approach was implemented to discriminate the different optical signals composing the light output at the exit of the single collection optical fiber. The mPSD was tested with different source-to-detector positions, ranging from 1 to 5 cm radially and over 10.5 cm along the longitudinal axis of the detector, and with various integration times. Several strategies for improving the accuracy of the detector were investigated. The device's accuracy in detecting source position was also tested. Results: Good agreement with the expected doses was obtained for all of the scintillating elements, with average relative differences from the expected values of 3.4 ± 2.1%, 3.0 ± 0.7%, and 4.5 ± 1.0% for scintillating elements from the distal to the proximal. A dose threshold of 3 cGy improved the general accuracy of the detector. An integration time of 3 s offered a good trade-off between precision and temporal resolution. Finally, the mPSD measured the radioactive source positioning uncertainty to be no more than 0.32 ± 0.06 mm. The accuracy and precision of the detector were improved by a dose-weighted function combining the three measurement points and known details about the geometry of the detector construction. Conclusions: The use of a mPSD for high-dose-rate brachytherapy dosimetry is feasible. This detector shows great promise for development of in vivo applications for real-time verification of treatment delivery.

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Feasibility of determining external beam radiotherapy dose using LuSy dosimeter

Wahabi,

Wong,

Mahdiraji

et al. 2024

J Applied Clin Med Phys

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IntroductionRadiation dose measurement is an essential part of radiotherapy to verify the correct delivery of doses to patients and ensure patient safety. Recent advancements in radiotherapy technology have highlighted the need for fast and precise dosimeters. Technologies like FLASH radiotherapy and magnetic‐resonance linear accelerators (MR‐LINAC) demand dosimeters that can meet their unique requirements. One promising solution is the plastic scintillator‐based dosimeter with high spatial resolution and real‐time dose output. This study explores the feasibility of using the LuSy dosimeter, an in‐house developed plastic scintillator dosimeter for dose verification across various radiotherapy techniques, including conformal radiotherapy (CRT), intensity‐modulated radiation therapy (IMRT), volumetric‐modulated arc therapy (VMAT), and stereotactic radiosurgery (SRS).Materials and methodsA new dosimetry system, comprising a new plastic scintillator as the sensing material, was developed and characterized for radiotherapy beams. Treatment plans were created for conformal radiotherapy, IMRT, VMAT, and SRS and delivered to a phantom. LuSy dosimeter was used to measure the delivered dose for each plan on the surface of the phantom and inside the target volumes. Then, LuSy measurements were compared against an ionization chamber, MOSFET dosimeter, radiochromic films, and dose calculated using the treatment planning system (TPS).ResultsFor CRT, surface dose measurement by LuSy dosimeter showed a deviation of ‐5.5% and ‐5.4% for breast and abdomen treatment from the TPS, respectively. When measuring inside the target volume for IMRT, VMAT, and SRS, the LuSy dosimeter produced a mean deviation of ‐3.0% from the TPS. Surface dose measurement resulted in higher TPS discrepancies where the deviations for IMRT, VMAT, and SRS were ‐2.0%, ‐19.5%, and 16.1%, respectively.ConclusionThe LuSy dosimeter was feasible for measuring radiotherapy doses for various treatment techniques. Treatment delivery verification enables early error detection, allowing for safe treatment delivery for radiotherapy patients.

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A mathematical formalism for hyperspectral, multipoint plastic scintillation detectors

Cited by 49 publications

References 24 publications

In vivodosimetry: trends and prospects for brachytherapy

In vivodosimetry: trends and prospects for brachytherapy

On the use of a single‐fiber multipoint plastic scintillation detector for ¹⁹²Ir high‐dose‐rate brachytherapy

Feasibility of determining external beam radiotherapy dose using LuSy dosimeter

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A mathematical formalism for hyperspectral, multipoint plastic scintillation detectors

Cited by 49 publications

References 24 publications

In vivodosimetry: trends and prospects for brachytherapy

In vivodosimetry: trends and prospects for brachytherapy

On the use of a single‐fiber multipoint plastic scintillation detector for 192Ir high‐dose‐rate brachytherapy

Feasibility of determining external beam radiotherapy dose using LuSy dosimeter

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On the use of a single‐fiber multipoint plastic scintillation detector for ¹⁹²Ir high‐dose‐rate brachytherapy