Impact of testicular shielding in liposarcoma to scrotum by using radio-photoluminescence glass dosimeter (RPLGD): a case report

Oonsiri, Puntiwa; Saksornchai, Kitwadee; Suriyapee, Sivalee

doi:10.3857/roj.2018.00143

Cited by 7 publications

(6 citation statements)

References 13 publications

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“…The RGD exhibited excellent dosimetric characteristics and clinical applications in our previous study on photon beams [10][11][12]. Limited studies have applied RGDs in the clinical usage of proton beams.…”

Section: Introductionmentioning

confidence: 91%

Dosimetric characteristics of radiophotoluminescent glass dosimeters for proton beams

Oonsiri

Kingkaew

Vimolnoch

et al. 2023

Preprint

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Background: The study of radiophotoluminescent glass dosimeters (RGDs) in the clinical usage of proton beams is limited. The aim of this study was to investigate the dosimetric characteristics of RGDs for pencil beam scanning proton therapy. The feasibility of using an RGD in end-to-end testing of intensity-modulated proton therapy (IMPT) plans at various treatment sites was also evaluated. Materials and methods: The dosimetric characteristics of the GD-302M type glass dosimeter were studied in terms of uniformity, short-term and long-term reproducibility, stability of the magazine position readout, dose linearity in the range from 0.2-20 Gy, energy response in 70-220 MeV, MU/spot, dose rate response, and fading effect. The reference conditions of the spot scanning beam from the Varian ProBeam Compact system were operation at 160 MeV, a 2 cm water equivalent depth in a solid water phantom, a 10×10 cm field size at the isocenter, and 2 Gy dose delivery. End-to-end testing of IMPT plans for the head, abdomen, and pelvis was verified by using the Alderson Rando phantom. The overall uncertainty analysis was confirmed in this study. Results: The relative response of RGDs for the uniformity test was within 0.95-1.05. The %CVs of the short-term and long-term reproducibility were 1.16% and 1.50%, respectively. The FGD-1000 automatic reader showed stable magazine position readout. The dose linearity was found to have an obviously good linear relationship, with R2 = 0.9988. The energy response relative to 160 MeV was approximately within 4.0%. The MU/spot and dose rate had less effect on the RGD readout. The fading effect was relatively stable for 10 weeks of storage, within 2.4%. For the end-to-end test, the maximum difference between the treatment plan and RGD measurement showed a very good result that was within 1.0%. The overall uncertainty of the RGD measurement for the proton beam was 4.6%. Conclusion: RGDs have confirmed the potential for proton dosimetry, including in end-to-end testing. The appropriate correction factor for the energy response can be applied for dose verification of scanning proton beams.

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Section: Introductionmentioning

confidence: 91%

Dosimetric characteristics of radiophotoluminescent glass dosimeters for proton beams

Oonsiri

Kingkaew

Vimolnoch

et al. 2023

Preprint

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“…Unintentional doses outside of the treatment fields in radiotherapy arise from internal scatter within the patient, collimator scatter and leakage radiation. 5 Advanced techniques for breast irradiation such as intensity-modulated radiation therapy (IMRT) and volumetric modulated radiation therapy (VMAT), 6 along with deep inspiration breath-hold technique, 7 attempt to avoid radiation doses to the organs at risk and increase dose coverage to the planning target volume (PTV). However, these techniques yield higher radiation leakage from the linear accelerator owing to the higher monitor unit (MU), which is similar to the prescription dose for traditional standard techniques.…”

Section: Introductionmentioning

confidence: 99%

“…These advantages make RPLDs more robust than thermoluminescence dosimeters (TLDs) for radiation dosimetry 5,9 . Unlike TLD and optically stimulated luminescence (OSL), RPLDs do not require individual sensitivity correction factors 5 . Therefore, the present study selected RPLDs for dose measurement at the ovaries and uterus in a Rando phantom with tissue‐simulated materials.…”

Section: Introductionmentioning

confidence: 99%

“…These passive dosimeters offer several benefits, as reported by Oonsiri et al, 8 including small size, high sensitivity, photon energy, dose rate independence, angular independence in the beam direction perpendicular to the longitudinal axis of the RPLD and adequate repeated reading until the detectors become annealed. These advantages make RPLDs more robust than thermoluminescence dosimeters (TLDs) for radiation dosimetry 5,9 . Unlike TLD and optically stimulated luminescence (OSL), RPLDs do not require individual sensitivity correction factors 5 .…”

Section: Introductionmentioning

confidence: 99%

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Estimated radiation doses to ovarian and uterine organs in breast cancer irradiation using radio‐photoluminescent glass dosimeters (RPLDs)

Oonsiri

Vannavijit

Wimolnoch

et al. 2020

J of Medical Radiation Sci

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Introduction:The well-being of breast cancer patients is essential, especially fertility in patients of reproductive age. The objective of this study was to estimate the radiation doses to the ovaries and uterus for different treatment techniques of breast cancer irradiation using radio-photoluminescent glass dosimeters (RPLDs). Methods: A Farmer-type ionisation chamber (IBA FC-65G) and RPLDs were used to measure in-and out-of-field radiation doses in a solid water phantom. The field sizes were set to 10 9 10 cm 2 and 8 9 17 cm 2 with the central axis at out-of-field measurement distances of 30 or 50 cm. The Rando phantom's left breast was planned using four different techniques: two tangential standard fields with and without electronic tissue compensator (E-comp) techniques, intensity-modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT). The radiation doses in the ipsilateral ovary, contralateral ovary and uterus were measured using RPLDs. Results: The percentage ratio of out of field to in field was affected by distance from the central axis to the point of measurement, in addition to the field sizes associated with collimator scatter. Advanced techniques such as IMRT and VMAT produced higher doses to the ovaries and uterus. The estimated results of the worst-case scenario for the ipsilateral ovary, contralateral ovary and uterus were 0.84% (42 cGy), 0.62% (31 cGy) and 0.76% (38 cGy), respectively, for a 5000 cGy prescription dose. Conclusion:The lowest to highest out-of-field radiation doses to the ovarian and uterine organs from breast irradiation were the two tangential field techniques, VMAT and IMRT. These advanced techniques yielded higher radiation leakage, which potentially contributed to the out-of-field radiation dose.

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“…However, the directional dependence was found for RPLGD because of its cylindrical shape. The RPLGD has been increasingly used in radiation measurement, such as in vivo dosimetry, to study the impact of testicular shielding (18). The dimension of RPLGD is relatively small, with 1.5 mm diameter and 12 mm length (effective length of 0.6 mm).…”

Section: Introductionmentioning

confidence: 99%

Determination of field output correction factors of radiophoto luminescent glass dosimeter in 6 mv small photon beams

Yabsantia¹

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The objective of this study was to determine the field output correction factors of radiophotoluminescent glass dosimeter (RPLGD) for 6 MV photon beams by using Monte Carlo (MC) simulation. The ratios of absorbed dose of water and RPLGD were calculated using egs_chamber code for 6 MV, 90-cm SSD, 10-cm depth, and field size range from 0.5 × 0.5 to 10 × 10 cm2. Then the field output correction factors of RPLGD in perpendicular and parallel orientations were determined. Also, the volume averaging correction factors were discovered for supporting our results. Moreover, the comparison of measurement field output factors of RPLGD and that of CC01 determining using the field output correction factors from IAEA-AAPM TRS483 were performed to validate the field output correction factors in this study. For the results of the ratio of reading, the perpendicular RPLGD exhibited the underestimation for all field sizes. Parallel RPLGD showed underestimation for field size down to 1 × 1 cm2. In contrast, the overestimation was observed for lower field sizes. The field output correction factors of RPLGD were introduced. For the smallest field size, the field output correction factors of parallel RPLGD was within 5%, while perpendicular RPLGD was high up to 19%. The significant deviation of the field output correction factors in perpendicular RPLGD for the smallest field size because of a large volume averaging effect of 27%, while this effect was minimal in parallel RPLGD. The field output correction factor less than unity was observed in parallel orientation owing to the effect of the high density of RPLGD material. The percentage differences of field output factors comparing with CC01 were less than 3% for all field sizes, except the smallest field size of RPLGD in perpendicular. In conclusion, the field output correction factors of parallel RPLGD were practical for small field output factor measurement until field size down to 0.6 × 0.6 cm2. In comparison, RPLGD in perpendicular was practical for field size down to 1 × 1 cm2.

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Impact of testicular shielding in liposarcoma to scrotum by using radio-photoluminescence glass dosimeter (RPLGD): a case report

Cited by 7 publications

References 13 publications

Dosimetric characteristics of radiophotoluminescent glass dosimeters for proton beams

Dosimetric characteristics of radiophotoluminescent glass dosimeters for proton beams

Estimated radiation doses to ovarian and uterine organs in breast cancer irradiation using radio‐photoluminescent glass dosimeters (RPLDs)

Determination of field output correction factors of radiophoto luminescent glass dosimeter in 6 mv small photon beams

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