Applicability of two-dimensional thermoluminescence slab dosimeter based on Al 2 O 3 :Cr for the quality assurance of robotic radiosurgery

Yanagisawa, Shin; Shinsho, Kiyomitsu; Inoue, Mitsuhiro; Koba, Yusuke; Matsumoto, Kazuki; Ushiba, Hiroaki; Andoh, Takayuki

doi:10.1016/j.radmeas.2017.01.014

Cited by 14 publications

(11 citation statements)

References 9 publications

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“…2.4.2. (8) For the quality control of a radiation therapy system using the dose distribution, it is important to evaluate the invariance of the beam shape. For this evaluation, 80% of the beam area closest to the center is recommended.…”

Section: Absorbed Dose Distribution Measurement Using Tlsdmentioning

confidence: 99%

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Usefulness of Thermoluminescent Slab Dosimeter for Postal Dosimetry Audit of External Radiotherapy Systems

Maruyama¹,

Yanagisawa²,

Koba³

et al. 2020

Sensors and Materials

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In this study, the feasibility of using a thermoluminescent slab dosimeter (TLSD) in postal dosimetry audit for radiotherapy systems is examined. First, changes in material structure are evaluated by measuring changes in TLSD weight and temperature after heating and cooling. Then, a fading correction factor is derived by measuring the relationship between the elapsed time after irradiation and thermoluminescence (TL) intensity. Finally, the uncertainty in the absorbed dosimetry using the TLSD with the TL absorbed dose correction factor is evaluated. It is shown that the TLSD weight and heat flow change after heating. These changes are reversible upon cooling. Therefore, the material structure of the TLSD does not change after heating. The fading effect for the TLSD can be minimized by setting the elapsed time to more than 100 h. Furthermore, measurement accuracy can be improved by correcting the fading. The overall measurement uncertainty or expanded relative standard uncertainty for this measurement method is 1.80%. The TLSD has high material stability and measurement accuracy under a certain condition equivalent to that of conventional postal dosimetry audit conducted using a glass dosimeter. The TLSD can be used as a 2D measurement device for postal dosimetry audit.

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Section: Absorbed Dose Distribution Measurement Using Tlsdmentioning

confidence: 99%

“…It has been shown that the dose distribution can be obtained using the absorbed dose correction factor. (8) If a sufficiently high accuracy in postal dosimetry measurement using a TLSD can be achieved, TLSDs can be used by third parties to evaluate dose distributions.…”

Section: Introductionmentioning

confidence: 99%

Usefulness of Thermoluminescent Slab Dosimeter for Postal Dosimetry Audit of External Radiotherapy Systems

Maruyama¹,

Yanagisawa²,

Koba³

et al. 2020

Sensors and Materials

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“…Some results were not as promising as others-several powdered doped Al 2 O 3 samples produced by solution combustion method were characterized for TL and OSL properties [6]; however, they did not demonstrate attractive dosimeter properties. At the same time, Japanese researchers have found that doping with Cr enhances sensitivity and the fading characteristics of alumina, demonstrated in X-ray imaging, which makes this material suitable for two-dimensional TL slab dosimeters for robotic radiosurgery systems [7]. As shown in [8] doping of nanopowdered Al 2 O 3 with chromium makes it sensitive to higher γ-ray doses (100 Gy-20 kGy without saturation).…”

Section: Introductionmentioning

confidence: 98%

Usability of Cr-Doped Alumina in Dosimetry

et al. 2019

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Dosimetry is a widespread material science field dealing with detection and quantification of ionizing radiation using electronic processes in materials. One of the main aspects that determines the performance of dosimeters is the type of defects the material contains. Crystalline lattice imperfections are formed around impurity ions, which may have a smaller or larger size, or different oxidation states compared to host ions. In this study, we show what effects Cr impurities have on the luminescent properties of alumina. Porous Al 2 O 3 : Cr microceramics synthesized using the sol-gel method showed a higher thermoluminescence response than a single crystal ruby. We have found that Cr 2 O 3 concentration of 0.2 wt% was optimal; it yielded the highest X-ray luminescence and thermostimulated luminescence readout of all studied additive concentrations added to alumina during synthesis. Our results show that Cr doped alumina could potentially be used as a promising new material for dosimetry of ionizing radiation.

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“…A previous study suggested that 2D Al 2 O 3 :Cr TLDs have high applicability for the quality assurance of robotic radiosurgery. (17) However, Al 2 O 3 :Cr TLDs lack tissue equivalence. Also, multienergy X-ray beams are used in radiotherapy, while only 6 MV X-ray beams are used in robotic radiosurgery.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional Thermoluminescence Dosimetry Using Al2O3:Cr Ceramics for 4, 6, and 10 MV X-ray Beams

Yanagisawa¹,

Maruyama²,

Oh³

et al. 2020

Sensors and Materials

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Despite their advantages, two-dimensional (2D) thermoluminescence dosimeters (TLDs) have not yet replaced film dosimeters owing to their nonuniformity and low repeatability. A 2D TLD based on Al 2 O 3 :Cr ceramics is a promising new reusable passive dosimeter. 2D Al 2 O 3 :Cr TLDs can be used for geometry check tests and dose distribution verification in robotic radiosurgery using monoenergetic X-ray beams. In this work, the dependence of energy on the field size and water depth of 2D Al 2 O 3 :Cr TLDs for 4, 6, and 10 MV X-ray beams was investigated, because multienergy X-ray beams are used in radiotherapy. Intensity-modulated radiotherapy plan verifications were performed using the TLDs. The TLDs were found to have a large field size dependence for each energy, but their water depth dependence was small at a water depth above 4 cm for each energy. The relative dose distributions were verified with high accuracy using the TLDs.

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Applicability of two-dimensional thermoluminescence slab dosimeter based on Al 2 O 3 :Cr for the quality assurance of robotic radiosurgery

Cited by 14 publications

References 9 publications

Usefulness of Thermoluminescent Slab Dosimeter for Postal Dosimetry Audit of External Radiotherapy Systems

Usefulness of Thermoluminescent Slab Dosimeter for Postal Dosimetry Audit of External Radiotherapy Systems

Usability of Cr-Doped Alumina in Dosimetry

Two-dimensional Thermoluminescence Dosimetry Using Al2O3:Cr Ceramics for 4, 6, and 10 MV X-ray Beams

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