Novel optical fiber sensors and their applications in radiotherapy

Alharbi, Majed; Martyn, Michael; Chen, Lingxia; Gillespie, Sean; Woulfe, Peter; O'Keeffe, Sinéad; Foley, Mark

doi:10.1117/12.2306417

Cited by 10 publications

(11 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, an optical fibre sensor based on inorganic scintillating material terbium doped gadolinium oxysulphide (Gd2O2S:Tb) was developed by O`Keeffe et al [7]. The sensor showed promising characteristics making it a good candidate to use for in vivo dosimetry in radiotherapy and brachytherapy [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Dosimetric Characterization of an Inorganic Optical Fiber Sensor for External Beam Radiation Therapy

et al. 2019

Self Cite

View full text Add to dashboard Cite

The aim of this study was to investigate the dosimetric performance of a novel optical fiber sensor for use in external beam radiation therapy. Repeatability and reproducibility of the output signal, linearity, dose rate and dose per pulse dependence were evaluated. Angular dependence was investigated in the axial and azimuthal planes. The percentage depth dose and lateral dose profiles were measured using the optical fiber sensor system and compared to commercially available detectors such as Exradin W1 plastic scintillator and a PTW-microdiamond detector. The result of this study show that the optical fiber sensor system has good repeatability and reproducibility of the output signal with a maximum deviation of 0.17% and 1.00%, respectively. The system also showed an excellent linearity with dose, and its signal was independent of dose rate. However, the system showed a strong dependence on dose per pulse with 27% deviation from the W1 result at the highest dose per pulse value that was achieved at 75 cm source to surface distance. The system also showed an angular dependence when the incident beam was in the azimuthal plane due to the geometry of the scintillator at the tip of the fiber. The optical fiber sensor overresponded when measuring percentage depth dose curves and lateral dose profiles due in part to the sensitivity of the scintillating material (Gd2O2S:Tb) to low energy scattered radiation. However, further investigation is needed to quantify the overall contribution of Cerenkov radiation to the over-response of the optical fiber sensor.

show abstract

Section: Introductionmentioning

confidence: 99%

Dosimetric Characterization of an Inorganic Optical Fiber Sensor for External Beam Radiation Therapy

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…A representative design (which was adapted from a previous design by Alharbi et al [18]) schematic for the OFDs is illustrated in Figure 1. Each ISD consisted of a 1 mm diameter, 1 m long cladded PMMA optical fiber made light-tight by a 0.6 mm thick protective polyethylene jacket, and a SubMiniature version A (SMA) connection at one end.…”

Section: Detector Designmentioning

confidence: 99%

Initial Evaluation of the Performance of Novel Inorganic Scintillating Detectors for Small Animal Irradiation Dosimetry

et al. 2020

Self Cite

View full text Add to dashboard Cite

The purpose of this study was to design and evaluate the performance of four novel inorganic scintillating detectors (ISDs) on the Small Animal Radiation Research Platform (SARRP). Relative scintillator output, measurement repeatability, setup uncertainty, linearity with dose rate, and signal reproducibility over time were investigated. The Gd2O2S:Tb detector had the highest relative signal output, generating up to 219 times more charge than a previously characterized BCF-60based plastic scintillating detector (PSD). The Gd2O2S:Tb detector was then used to measure 220 kVp therapy beam profiles of 10 x 10 and 5 x 5 mm 2 fields. Beam profiles using the ZnS-based phosphor were also obtained and compared to investigate the performance of a lower density inorganic scintillator. 10 x 10 and 5 x 5 mm 2 therapy beam profile measurements made with the Gd2O2S:Tb and BCF-60 detectors differed, on average, by 1.1% and 1.9%, respectively. The ZnS:Ag measurements differed, on average, by 2.5% and 6% relative to BCF-60 measurements of the 10 x 10 and 5 x 5 mm 2 beam profiles, respectively. MicroCT imaging of the detector volumes was also performed, revealing poor packing of the ZnS:Ag crystalline phosphor in the deepest region of the cylindrical cavity. The Gd2O2S:Tb detector, in particular, has proven to be a promising candidate for real-time dosimetry of small fields in small animal irradiators, primarily because of the very large signal intensities observed, along with good repeatability, dose rate linearity, reproducibility and agreement with beam profile measurements made with a previously validated detector.

show abstract

“…In this study, we designed a small size, high resolution optical fiber X-ray sensing array(OFXSA), which can be used as a method for small-field dosimetry. This system consists of seven embedded structure PMMA optical fibers, an 8-channel optical switch and a Photon Counting Detector [9] . It was therefore the purpose of this study is to use the OFSA to measure the dose distribution under small field.…”

Section: Introductionmentioning

confidence: 99%

An optical fiber x-ray sensing array for small-field radiotherapy

He,

Chen,

Wang

et al. 2023

Optics in Health Care and Biomedical Optics XIII

View full text Add to dashboard Cite

The small-field radiotherapy is a developing technique because it can reduce the damage to normal tissues. However measurement of the dose distributions of small radiation fields in radiotherapy is a challenge. In this work, we designed and produced an optic fiber X-ray sensor array with high spatial resolution. The sensing array includes 7 sensing probes connecting to an 8-channel optical switch and a photon counting detector (PCD). To verify the practicality of the system, these sensors were measured under a 10×10 cm 2 field of a medical linear accelerator. For the small-field application, the dose distribution of radiotherapy fields 1×1 cm 2 and 0.8×0.8 cm 2 were measured. The distribution of these small radiotherapy fields were given based on the experimental results.

show abstract

Novel optical fiber sensors and their applications in radiotherapy

Cited by 10 publications

References 23 publications

Dosimetric Characterization of an Inorganic Optical Fiber Sensor for External Beam Radiation Therapy

Dosimetric Characterization of an Inorganic Optical Fiber Sensor for External Beam Radiation Therapy

Initial Evaluation of the Performance of Novel Inorganic Scintillating Detectors for Small Animal Irradiation Dosimetry

An optical fiber x-ray sensing array for small-field radiotherapy

Contact Info

Product

Resources

About