Technical note: Temporal and thermal stability of optical response for silicone-based 3D radiochromic dosimeters

Lia Valdetaro; Morten Bjørn Jensen; Ludvig Muren; Peter Sandegaard Skyt; Jørgen Breede Baltzer Petersen; Peter Balling

doi:10.1002/mp.16193

Technical note: Temporal and thermal stability of optical response for silicone-based 3D radiochromic dosimeters

Lia Valdetaro^*, Morten Bjørn Jensen, Ludvig Muren, Peter Sandegaard Skyt, Jørgen Breede Baltzer Petersen, Peter Balling

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

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Abstract

Background: Radiochromic silicone-based dosimeters are flexible 3D dosimeters, which at appropriate concentration of leucomalachite green (LMG) and curing agent are dose-rate independent for clinical photon beams. However, their dose response is based on chemical processes that can be influenced by temporal and thermal conditions, impacting measurement stability. Purpose: The aim of this study was to investigate the temporal stability of the dose response of radiochromic dosimeters for different curing times and post-irradiation storage temperatures. Methods: Six cylindrical dosimeters (5 cm diameter, 5 cm length) were produced in a single batch and separated into two groups that were irradiated 72 and 118 h after production. The same photon plan, consisting of two 10 × 1.6 cm ² opposing fields, was delivered to all dosimeters. After irradiation, the dosimeters were separated into three groups, stored at 5°C, 15°C, and 20°C, and read out for five consecutive days. Results: Storage temperature influenced the measurement stability, and changes in the optical response with time differed between irradiated and non-irradiated parts of the dosimeters. The relative change between signal and background was greater than 10% for all measurements performed 24 h or more after irradiation, except for dosimeters stored at 5°C, which changed by 2%–5% after 24 h. The dosimeter temporal stability was not influenced by curing time. Conclusions: For room temperature storage (15°C and 20°C), readout should take place as soon as possible after irradiation since the background color increased rapidly for both curing times (72 and 118 h), whereas the dosimeters are stored at 5°C, readout can be performed up to 24 h after.

Original language	English
Journal	Medical Physics
Volume	50
Issue	4
Pages (from-to)	2560-2564
Number of pages	5
ISSN	0094-2405
DOIs	https://doi.org/10.1002/mp.16193
Publication status	Published - Apr 2023

Keywords

3D dosimetry
3D solid gel/plastic
deformable
general
optical computed tomography
radiochromic dosimeters
temporal stability
thermal stability

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10.1002/mp.16193Licence: CC BY-NC

Medical Physics - 2022 - Valdetaro - Technical note Temporal and thermal stability of optical response for silicone‐basedFinal published version, 763 KBLicence: CC BY-NC

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@article{4b3ccf43c35e4dd086a1bf00c49f6836,

title = "Technical note: Temporal and thermal stability of optical response for silicone-based 3D radiochromic dosimeters",

abstract = "Background: Radiochromic silicone-based dosimeters are flexible 3D dosimeters, which at appropriate concentration of leucomalachite green (LMG) and curing agent are dose-rate independent for clinical photon beams. However, their dose response is based on chemical processes that can be influenced by temporal and thermal conditions, impacting measurement stability. Purpose: The aim of this study was to investigate the temporal stability of the dose response of radiochromic dosimeters for different curing times and post-irradiation storage temperatures. Methods: Six cylindrical dosimeters (5 cm diameter, 5 cm length) were produced in a single batch and separated into two groups that were irradiated 72 and 118 h after production. The same photon plan, consisting of two 10 × 1.6 cm 2 opposing fields, was delivered to all dosimeters. After irradiation, the dosimeters were separated into three groups, stored at 5°C, 15°C, and 20°C, and read out for five consecutive days. Results: Storage temperature influenced the measurement stability, and changes in the optical response with time differed between irradiated and non-irradiated parts of the dosimeters. The relative change between signal and background was greater than 10% for all measurements performed 24 h or more after irradiation, except for dosimeters stored at 5°C, which changed by 2%–5% after 24 h. The dosimeter temporal stability was not influenced by curing time. Conclusions: For room temperature storage (15°C and 20°C), readout should take place as soon as possible after irradiation since the background color increased rapidly for both curing times (72 and 118 h), whereas the dosimeters are stored at 5°C, readout can be performed up to 24 h after.",

keywords = "3D dosimetry, 3D solid gel/plastic, deformable, general, optical computed tomography, radiochromic dosimeters, temporal stability, thermal stability",

author = "Lia Valdetaro and Jensen, {Morten Bj{\o}rn} and Ludvig Muren and Skyt, {Peter Sandegaard} and Petersen, {J{\o}rgen Breede Baltzer} and Peter Balling",

note = "{\textcopyright} 2022 The Authors. Medical Physics published by Wiley Periodicals LLC on behalf of American Association of Physicists in Medicine.",

year = "2023",

month = apr,

doi = "10.1002/mp.16193",

language = "English",

volume = "50",

pages = "2560--2564",

journal = "Medical Physics",

issn = "0094-2405",

publisher = "John Wiley and Sons Ltd",

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Technical note: Temporal and thermal stability of optical response for silicone-based 3D radiochromic dosimeters. / Valdetaro, Lia; Jensen, Morten Bjørn ; Muren, Ludvig et al.
In: Medical Physics, Vol. 50, No. 4, 04.2023, p. 2560-2564.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - Technical note

T2 - Temporal and thermal stability of optical response for silicone-based 3D radiochromic dosimeters

AU - Valdetaro, Lia

AU - Jensen, Morten Bjørn

AU - Muren, Ludvig

AU - Skyt, Peter Sandegaard

AU - Petersen, Jørgen Breede Baltzer

AU - Balling, Peter

PY - 2023/4

Y1 - 2023/4

N2 - Background: Radiochromic silicone-based dosimeters are flexible 3D dosimeters, which at appropriate concentration of leucomalachite green (LMG) and curing agent are dose-rate independent for clinical photon beams. However, their dose response is based on chemical processes that can be influenced by temporal and thermal conditions, impacting measurement stability. Purpose: The aim of this study was to investigate the temporal stability of the dose response of radiochromic dosimeters for different curing times and post-irradiation storage temperatures. Methods: Six cylindrical dosimeters (5 cm diameter, 5 cm length) were produced in a single batch and separated into two groups that were irradiated 72 and 118 h after production. The same photon plan, consisting of two 10 × 1.6 cm 2 opposing fields, was delivered to all dosimeters. After irradiation, the dosimeters were separated into three groups, stored at 5°C, 15°C, and 20°C, and read out for five consecutive days. Results: Storage temperature influenced the measurement stability, and changes in the optical response with time differed between irradiated and non-irradiated parts of the dosimeters. The relative change between signal and background was greater than 10% for all measurements performed 24 h or more after irradiation, except for dosimeters stored at 5°C, which changed by 2%–5% after 24 h. The dosimeter temporal stability was not influenced by curing time. Conclusions: For room temperature storage (15°C and 20°C), readout should take place as soon as possible after irradiation since the background color increased rapidly for both curing times (72 and 118 h), whereas the dosimeters are stored at 5°C, readout can be performed up to 24 h after.

AB - Background: Radiochromic silicone-based dosimeters are flexible 3D dosimeters, which at appropriate concentration of leucomalachite green (LMG) and curing agent are dose-rate independent for clinical photon beams. However, their dose response is based on chemical processes that can be influenced by temporal and thermal conditions, impacting measurement stability. Purpose: The aim of this study was to investigate the temporal stability of the dose response of radiochromic dosimeters for different curing times and post-irradiation storage temperatures. Methods: Six cylindrical dosimeters (5 cm diameter, 5 cm length) were produced in a single batch and separated into two groups that were irradiated 72 and 118 h after production. The same photon plan, consisting of two 10 × 1.6 cm 2 opposing fields, was delivered to all dosimeters. After irradiation, the dosimeters were separated into three groups, stored at 5°C, 15°C, and 20°C, and read out for five consecutive days. Results: Storage temperature influenced the measurement stability, and changes in the optical response with time differed between irradiated and non-irradiated parts of the dosimeters. The relative change between signal and background was greater than 10% for all measurements performed 24 h or more after irradiation, except for dosimeters stored at 5°C, which changed by 2%–5% after 24 h. The dosimeter temporal stability was not influenced by curing time. Conclusions: For room temperature storage (15°C and 20°C), readout should take place as soon as possible after irradiation since the background color increased rapidly for both curing times (72 and 118 h), whereas the dosimeters are stored at 5°C, readout can be performed up to 24 h after.

KW - 3D dosimetry

KW - 3D solid gel/plastic

KW - deformable

KW - general

KW - optical computed tomography

KW - radiochromic dosimeters

KW - temporal stability

KW - thermal stability

U2 - 10.1002/mp.16193

DO - 10.1002/mp.16193

M3 - Journal article

C2 - 36585852

SN - 0094-2405

VL - 50

SP - 2560

EP - 2564

JO - Medical Physics

JF - Medical Physics

IS - 4

ER -

Technical note: Temporal and thermal stability of optical response for silicone-based 3D radiochromic dosimeters

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Keywords

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