Development of a fiber-optic dosimeter based on modified direct measurement for real-time dosimetry during radiation diagnosis

Abstract

For applying modified direct measurement, we developed a fiber-optic dosimeter (FOD) with two dosimeter probes to infer the entrance surface dose (ESD) at the center of an x-ray beam field without the obstruction of radiation imaging. The dosimeter probe of the FOD was fabricated by coupling a plastic scintillating fiber to a plastic optical fiber. Under varying exposure parameters, we measured the scintillating light signals using two dosimeter probes, which were placed at the center and the edge of the beam field, respectively, and compared the results with the absorbed doses obtained using a conventional semiconductor dosimeter. Various correlations between the two dosimeter probes according to the exposure parameters were obtained for measuring ESD using a new modified direct measurement approach during a medical imaging task.

Systematic evaluation of photodetector performance for plastic scintillation dosimetry

“…The use of plastic scintillation detectors (PSDs) is becoming more common in all fields requiring measurement of radiation, including radiotherapy, 1-3 brachytherapy, [4][5][6] and, more recently, radiology. [7][8][9][10][11] Among the numerous applications for PSDs, small field dosimetry, [12][13][14] real-time in vivo measurements, 15,16 and two-dimensional (2D) dosimetry 17,18 have been evaluated. PSDs are known for their advantageous properties, such as near water-equivalence and small size, and their response is fast, reproducible, and dose rate-independent.…”

Monitoring methods for skin dose in interventional radiology

“…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.…”

Radiotherapy fiber dosimeter probes based on silver-only coated hollow glass waveguides

“…Some efforts have been devoted to developing methods to minimize the influence ofČerenkov radiation contamination in order to improve the accuracy of fiber optic dosimetry. These methods include the (i) Subtraction method 22,24 based on using a parallel bare fiber identical to the one that is connected to the scintillator piece to produce similarČerenkov light that can be subtracted from the total signal. However, this technique is not reliable for radiation fields with highdose gradient.…”