Development of a scintillating fiber-optic dosimeter for measuring the entrance surface dose in diagnostic radiology

Yoo, Wook Jae; Jeon, Dasom; Seo, Jeong Ki; Shin, Sang Hun; Han, Ki-Tek; Youn, Won Sik; Cho, Seung-Hyun; Lee, Bongsoo

doi:10.1016/j.radmeas.2012.11.001

Cited by 14 publications

(13 citation statements)

References 17 publications

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“…Other authors declare an energy dependence of plastic scintillator detectors sensitivity in the radiologic energy range (25-150 kVp). 13,14,[16][17][18][19] As reported by Williamson et al, 16 Lessard et al, 18 and Peralta and Rêgo, 19 it is partly related to energy absorption differences between the reference dose medium and the scintillator medium (air and polystyrene respectively in our case). As shown in Figure 4, the polystyrene-toair mass energy-absorption coefficients ratio shows significant variations ,100 keV.…”

Section: Full Paper: Scintillating Fibre Detector For Small Animal Dosupporting

confidence: 68%

“…The different prototypes described in literature present dosemeters with linear, reproducible dose measurements. [13][14][15] However, other studies also found an energy dependence of the dosemeter response, expressed as a decrease of sensitivity with decreasing energy. [16][17][18][19] In addition, in the kilovoltage energy range, the stem effect is mainly due to the fluorescence of the optical fibre and its contribution has been reported to be small.…”

Section: Introductionmentioning

confidence: 96%

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Characterization of a scintillating fibre detector for small animal imaging and irradiation dosimetry

Deroff

Frelin-Labalme

Ledoux

2017

BJR

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Objective: Small animal image-guided irradiators have recently been developed to mimic the delivery techniques of clinical radiotherapy. A dosemeter adapted to millimetric beams of medium-energy X-rays is then required. This work presents the characterization of a dosemeter prototype for this particular application. Methods: A scintillating optical fibre dosemeter (called DosiRat) has been implemented to perform real-time dose measurements with the dedicated small animal X-RAD® 225Cx (Precision X-Ray, Inc., North Branford, CT) irradiator. Its sensitivity, stem effect, stability, linearity and measurement precision were determined in large field conditions for three different beam qualities, consistent with small animal irradiation and imaging parameters. Results: DosiRat demonstrates good sensitivity and stability; excellent air kerma and air kerma rate linearity; and a good repeatability for air kerma rates .1 mGy s 21. The stem effect was found to be negligible. DosiRat showed limited precision for low air kerma rate measurements (,1 mGy s 21 ), typically for imaging protocols. A positive energy dependence was found that can be accounted for by calibrating the dosemeter at the needed beam qualities. Conclusion: The dosimetric performances of DosiRat are very promising. Extensive studies of DosiRat energy dependence are still required. Further developments will allow to reduce the dosemeter size to ensure millimetric beams dosimetry and perform small animal in vivo dosimetry. Advances in knowledge: Among existing point dosemeters, very few are dedicated to both medium-energy X-rays and millimetric beams. Our work demonstrated that scintillating fibre dosemeters are suitable and promising tools for real-time dose measurements in the small animal field of interest.

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Section: Full Paper: Scintillating Fibre Detector For Small Animal Dosupporting

confidence: 68%

Section: Introductionmentioning

confidence: 96%

Characterization of a scintillating fibre detector for small animal imaging and irradiation dosimetry

Deroff

Frelin-Labalme

Ledoux

2017

BJR

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“…Several studies evaluate the characteristics of optical fiber based dosimeters for radiology measurements. [17][18][19][20][21] Theses dosimeters have a very small volume (~1 mm 3 ) and excellent tissue equivalence in terms of electron density and atomic composition. The main disadvantage is the noise signal produced in the light-guide by Cerenkov radiation for higher MeV and fluorescence for low energy X-ray beam.…”

Section: Optical Fiber Dosimetermentioning

confidence: 99%

Monitoring methods for skin dose in interventional radiology

Chaikh

Gaudu

Balosso

2014

Int J Cancer Ther Oncol

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Interventional radiology makes an increasing use of X-ray for diagnostic and therapeutic procedures. The dose received by the patient sometime exceeds the threshold value of deterministic effects, and this requires monitoring of the dose delivered to the patients. Delivered dose could be assessed through either direct or indirect methods. The direct methods use dosimeters that are placed on the skin during the procedure, whereas, the indirect methods are based on measured quantities derived from the equipment itself. Each method has its own limitations; however, the main concern is the ability to measure the dose more accurately due to complexity of the anatomical structures of the patient and the variable course of each procedure. This review article summarizes the principle and main advantages and disadvantages of each method. A comparison of the performances of each method for interventional fluoroscopy and radiography in its ability to monitor the patient's skin dose is provided.

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“…Furthermore, apprehension about possible harm to people caused by radiation exposure has risen as the clinical use of diagnostic procedures increases. The radiological technologists have been demanding dose information [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…The entrance surface dose (ESD reported in mGy) value is specified as a useful descriptor to evaluate the absorbed dose of the patient in diagnostic radiology and it is generally defined as the absorbed dose detected at the point of intersection of the central X-ray beam axis with the patient or phantom surface, including backscattered radiation [ 2 , 3 ]. In practice, however, the absorbed dose is delivered unevenly in a beam irradiation field because the intensity distribution in an X-ray beam is not uniform due to the influence of the heel effect.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of a Multichannel All-In-One Phantom Dosimeter for Dose Measurement of Diagnostic X-ray Beam

Jeon

Yoo

Shin

et al. 2015

Sensors

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We developed a multichannel all-in-one phantom dosimeter system composed of nine sensing probes, a chest phantom, an image intensifier, and a complementary metal-oxide semiconductor (CMOS) image sensor to measure the dose distribution of an X-ray beam used in radiation diagnosis. Nine sensing probes of the phantom dosimeter were fabricated identically by connecting a plastic scintillating fiber (PSF) to a plastic optical fiber (POF). To measure the planar dose distribution on a chest phantom according to exposure parameters used in clinical practice, we divided the top of the chest phantom into nine equal parts virtually and then installed the nine sensing probes at each center of the nine equal parts on the top of the chest phantom as measuring points. Each scintillation signal generated in the nine sensing probes was transmitted through the POFs and then intensified by the image intensifier because the scintillation signal normally has a very low light intensity. Real-time scintillation images (RSIs) containing the intensified scintillation signals were taken by the CMOS image sensor with a single lens optical system and displayed through a software program. Under variation of the exposure parameters, we measured RSIs containing dose information using the multichannel all-in-one phantom dosimeter and compared the results with the absorbed doses obtained by using a semiconductor dosimeter (SCD). From the experimental results of this study, the light intensities of nine regions of interest (ROI) in the RSI measured by the phantom dosimeter were similar to the dose distribution obtained using the SCD. In conclusion, we demonstrated that the planar dose distribution including the entrance surface dose (ESD) can be easily measured by using the proposed phantom dosimeter system.

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Development of a scintillating fiber-optic dosimeter for measuring the entrance surface dose in diagnostic radiology

Cited by 14 publications

References 17 publications

Characterization of a scintillating fibre detector for small animal imaging and irradiation dosimetry

Characterization of a scintillating fibre detector for small animal imaging and irradiation dosimetry

Monitoring methods for skin dose in interventional radiology

Performance Evaluation of a Multichannel All-In-One Phantom Dosimeter for Dose Measurement of Diagnostic X-ray Beam

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