A novel extrapolation method using OSL detectors for very small field output factor measurement for stereotactic radiosurgery

Abstract Appropriate methods for the determination of very small X-ray beam output factors are essential to ensure correct clinical outcomes for stereotactic radiosurgery. To date, substantial work has been performed in identifying and quantifying suitable dosimeters for relative output factor (ROF)...
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Autor*in:	Huang, Te-An Polly [verfasserIn] Morales, Johnny E. [verfasserIn] Butson, Ethan [verfasserIn] Johnson, Annie [verfasserIn] Butson, Martin [verfasserIn] Hill, Robin [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2020

Schlagwörter:	Small X-ray field dosimetry OSLD Extrapolation technique

Übergeordnetes Werk:	Enthalten in: Australasian physical & engineering sciences in medicine - Cham : Springer, 2001, 43(2020), 2 vom: 08. Apr., Seite 593-599
Übergeordnetes Werk:	volume:43 ; year:2020 ; number:2 ; day:08 ; month:04 ; pages:593-599

Links:	Volltext

DOI / URN:	10.1007/s13246-020-00859-2

Katalog-ID:	SPR039994147

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source	Enthalten in Australasian physical & engineering sciences in medicine 43(2020), 2 vom: 08. Apr., Seite 593-599 volume:43 year:2020 number:2 day:08 month:04 pages:593-599
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author	Huang, Te-An Polly
spellingShingle	Huang, Te-An Polly ddc 610 bkl 44.03 misc Small X-ray field dosimetry misc OSLD misc Extrapolation technique A novel extrapolation method using OSL detectors for very small field output factor measurement for stereotactic radiosurgery
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topic_title	610 ASE 44.03 bkl A novel extrapolation method using OSL detectors for very small field output factor measurement for stereotactic radiosurgery Small X-ray field dosimetry (dpeaa)DE-He213 OSLD (dpeaa)DE-He213 Extrapolation technique (dpeaa)DE-He213
topic	ddc 610 bkl 44.03 misc Small X-ray field dosimetry misc OSLD misc Extrapolation technique
topic_unstemmed	ddc 610 bkl 44.03 misc Small X-ray field dosimetry misc OSLD misc Extrapolation technique
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title	A novel extrapolation method using OSL detectors for very small field output factor measurement for stereotactic radiosurgery
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title_full	A novel extrapolation method using OSL detectors for very small field output factor measurement for stereotactic radiosurgery
author_sort	Huang, Te-An Polly
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author_browse	Huang, Te-An Polly Morales, Johnny E. Butson, Ethan Johnson, Annie Butson, Martin Hill, Robin
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title_sort	novel extrapolation method using osl detectors for very small field output factor measurement for stereotactic radiosurgery
title_auth	A novel extrapolation method using OSL detectors for very small field output factor measurement for stereotactic radiosurgery
abstract	Abstract Appropriate methods for the determination of very small X-ray beam output factors are essential to ensure correct clinical outcomes for stereotactic radiosurgery. To date, substantial work has been performed in identifying and quantifying suitable dosimeters for relative output factor (ROF) measurements including recent IAEA published recommendations. In this work, we provide a novel method using optically stimulated luminescent dosimeters (OSLDs) with different effective sizes of the readout area to determine ROFs. This involves applying an extrapolation technique to assess ROFs for 6MV SRS X-ray beams with field diameters ranging from 4 to 30 mm as defined by the Brainlab SRS cones. By combining the use of multiple sized OSLDs and water droplets to remove air gaps located around the OSLD detectors, both volume averaging and density variation effects were minimised to estimate ROFs for an extrapolated zero volume detector. The measured results showed that for a 4 mm diameter cone, the ROF was 0.660 ± 0.032 (2SD) as compared to 0.661 ± 0.01 and 0.651 ± 0.018 for the PTW 600019 microDiamond detector and Gafchromic EBT3 film respectively. Whilst the uncertainties were larger than conventional detectors, the technique shows promise and improvements in accuracy may be obtained by higher quality manufacturing techniques. Based on these results, using OSLDs with different effective sizes of readout area and an extrapolation technique shows promise for use as an independent verification tool for very small X-ray field ROFs in the clinical department.
abstractGer	Abstract Appropriate methods for the determination of very small X-ray beam output factors are essential to ensure correct clinical outcomes for stereotactic radiosurgery. To date, substantial work has been performed in identifying and quantifying suitable dosimeters for relative output factor (ROF) measurements including recent IAEA published recommendations. In this work, we provide a novel method using optically stimulated luminescent dosimeters (OSLDs) with different effective sizes of the readout area to determine ROFs. This involves applying an extrapolation technique to assess ROFs for 6MV SRS X-ray beams with field diameters ranging from 4 to 30 mm as defined by the Brainlab SRS cones. By combining the use of multiple sized OSLDs and water droplets to remove air gaps located around the OSLD detectors, both volume averaging and density variation effects were minimised to estimate ROFs for an extrapolated zero volume detector. The measured results showed that for a 4 mm diameter cone, the ROF was 0.660 ± 0.032 (2SD) as compared to 0.661 ± 0.01 and 0.651 ± 0.018 for the PTW 600019 microDiamond detector and Gafchromic EBT3 film respectively. Whilst the uncertainties were larger than conventional detectors, the technique shows promise and improvements in accuracy may be obtained by higher quality manufacturing techniques. Based on these results, using OSLDs with different effective sizes of readout area and an extrapolation technique shows promise for use as an independent verification tool for very small X-ray field ROFs in the clinical department.
abstract_unstemmed	Abstract Appropriate methods for the determination of very small X-ray beam output factors are essential to ensure correct clinical outcomes for stereotactic radiosurgery. To date, substantial work has been performed in identifying and quantifying suitable dosimeters for relative output factor (ROF) measurements including recent IAEA published recommendations. In this work, we provide a novel method using optically stimulated luminescent dosimeters (OSLDs) with different effective sizes of the readout area to determine ROFs. This involves applying an extrapolation technique to assess ROFs for 6MV SRS X-ray beams with field diameters ranging from 4 to 30 mm as defined by the Brainlab SRS cones. By combining the use of multiple sized OSLDs and water droplets to remove air gaps located around the OSLD detectors, both volume averaging and density variation effects were minimised to estimate ROFs for an extrapolated zero volume detector. The measured results showed that for a 4 mm diameter cone, the ROF was 0.660 ± 0.032 (2SD) as compared to 0.661 ± 0.01 and 0.651 ± 0.018 for the PTW 600019 microDiamond detector and Gafchromic EBT3 film respectively. Whilst the uncertainties were larger than conventional detectors, the technique shows promise and improvements in accuracy may be obtained by higher quality manufacturing techniques. Based on these results, using OSLDs with different effective sizes of readout area and an extrapolation technique shows promise for use as an independent verification tool for very small X-ray field ROFs in the clinical department.
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title_short	A novel extrapolation method using OSL detectors for very small field output factor measurement for stereotactic radiosurgery
url	https://dx.doi.org/10.1007/s13246-020-00859-2
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