Reproducibility assessment of commercial optically stimulated luminescence system in diagnostic X-ray beams

Musa, Y.; Hashim, Suhairul; Bradley, D.A.; Karim, Muhammad Khalis Abdul; Hashim, Azian

doi:10.1007/s10967-017-5571-9

Cited by 10 publications

(2 citation statements)

References 19 publications

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“…For each frame in Fig.4, the red solid line represents the LED driver signal and the green line the detected analog voltage signal. There is a very short delay time (circa 110 ns) between the driver signal and detected signal, which is caused by the time of flight in the 20 m length of transmission POF with a core refractive index of 1.49[17]. Furthermore, in previous laboratory tests using a similar set-up but with a shorter length of transmitting fibre (2 m) no such delay was evident[14].…”

mentioning

confidence: 94%

Advanced characterization of an optical fibre sensor system based on an MPPC detector for measurement of X-ray radiation in clinical linacs

Chen

Ong

Chen

et al. 2021

Sensors and Actuators A: Physical

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mentioning

confidence: 94%

Advanced characterization of an optical fibre sensor system based on an MPPC detector for measurement of X-ray radiation in clinical linacs

Chen

Ong

Chen

et al. 2021

Sensors and Actuators A: Physical

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“…This is done by shining a certain wavelength of light (green) on the dosimeter, which moves the electrons to the conduction band and causes the electrons and holes to recombine back together. After that, a defect is made in the excited state, and the excited state returns to the ground state by giving off a photon (blue light), which is detected and measured by the OSLD reader [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

Entrance Skin Dose (ESD) and Bucky Table Induced Backscattered Dose (BTI-BSD) in Abdominal Radiography With nanoDot Optically Stimulated Luminescence Dosimeter (OSLD)

Sayed¹,

Roslan²,

Syed³

2023

Cureus

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In radiography, inconsistencies in patients' measured entrance skin dose (ESD) exist. There is no published research on the bucky table induced backscattered radiation dose (BTI-BSD). Thus, we aimed to ascertain ESD, calculate the BTI-BSD in abdominal radiography with a nanoDot OSLD, and compare the ESD results with the published data.A Kyoto Kagaku PBU-50 phantom (Kyoto, Japan) in an antero-posterior supine position was exposed, selecting a protocol used for abdominal radiography. The central ray of x-ray beam was pointed at the surface of abdomen at the navel, where a nanoDot dosimeter was placed to measure ESD. For the BTI-BSD, exit dose (ED) was determined by placing a second dosimeter on the exact opposite side (backside) of the phantom from the dosimeter used to determine (ESD) with and without bucky table at identical exposure parameters. The BTI-BSD was calculated as the difference between ED with and without bucky table. The ESD, ED, and BTI-BSD were measured in milligray (mGy).ESD mean values with and without bucky table were 1.97 mGy and 1.84 mGy, whereas ED values were 0.062 mGy and 0.052 mGy, respectively. Results show 2-26% lower ESD values with nanoDot OSLD. The BTI-BSD mean value was found to be approximately 0.01 mGy.A local dose reference level (LDRL) can be established using ESD data to safeguard patients from unnecessary radiation. In addition, to minimize the risk of BTI-BSD in patients in radiography, the search for the use or fabrication of a new, lower atomic number material for the bucky table is suggested.

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General radiographic attributes of optically stimulated luminescence dosimeters: A basic insight

Musa

Hashim

Ghoshal

et al. 2018

Radiation Physics and Chemistry

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We report the ubiquitous radiographic characteristics of optically stimulated luminescence dosimeters (OSLD) so called nanoDot OSLDs (Landauer Inc., Glendwood, IL). The X-ray irradiations were performed in free air ambiance to inspect the repeatability, the reproducibility, the signal depletion, the element correction factors (ECFs), the dose response and the energy dependence. Repeatability of multiple readouts after single irradiation to 10 mGy revealed a coefficient of variation below 3%, while the reproducibility in repeated irradiation-readout-annealing cycles was above 2%. The OSL signal depletion for three nanoDots with simultaneous irradiation to 20 mGy and sequential readouts of 25 times displayed a consistent signal reduction ≈0.5% per readout with R2 values over 0.98. ECFs for individual OSLDs were varied from 0.97 to 1.03. In the entire dose range under 80 kV, a good linearity with an R2 exceeding 0.99 was achieved. Besides, the percentage difference between OSLD and ion-chamber dose was less than 5%, which was superior to TLD. The X-ray photon irradiated energy response factors (between 0.76 and 1.12) in the range of 40-150 kV (26.1-61.2 keV) exhibited significant energy dependence. Indeed, the nanoDot OSLDs disclosed good repeatability, reproducibility and linearity. The OSLDs measured doses were closer to ion-chamber doses than that of TLD. It can be further improved up to ≈3% by applying the individual dosimeter ECF. On top, the energy dependent uncertainties can be minimized using the energy correction factors. It is established that the studied nanoDot OSLDs are prospective for measuring entrance dose in general radiographic practices.

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Reproducibility assessment of commercial optically stimulated luminescence system in diagnostic X-ray beams

Cited by 10 publications

References 19 publications

Advanced characterization of an optical fibre sensor system based on an MPPC detector for measurement of X-ray radiation in clinical linacs

Advanced characterization of an optical fibre sensor system based on an MPPC detector for measurement of X-ray radiation in clinical linacs

Entrance Skin Dose (ESD) and Bucky Table Induced Backscattered Dose (BTI-BSD) in Abdominal Radiography With nanoDot Optically Stimulated Luminescence Dosimeter (OSLD)

General radiographic attributes of optically stimulated luminescence dosimeters: A basic insight

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