Purpose: We present the tests performed on the prototype of a personal wireless dosimeter for medical staff during Interventional Radiology procedures, developed in the framework of the INFN RAPID Project. Methods and materials: The prototype is composed by a sensing element (a CMOS silicon pixel device), a real-time data reduction system (a CPLD), a control system, a wireless transmission module, a remote station for prototype configuration, control and data storage. The prototype has been irradiated in laboratory using monochromatic X-ray photons to calibrate the sensing element, then using the angiography system with a PMMA phantom, to diffuse the direct radiation, in all the working conditions (continuous/pulsed, fluoroscopy/digital radiography acquisition) and with different sensor settings. The prototype has also been exposed to a certified X-ray beam to obtain a relative calibration. Finally the sensing element of the prototype has also been used during medical procedures, mounted over the lead apron dressed by the medical staff. All the results have been compared with two control systems, a set of TLDs and an UNFORS EDD-30 system. Results: Two sensor quantities have been used to verify the linearity of the prototype's response: the number of detected photons and the total detected signal in a frame. The appropriate data reduction strategies have then been implemented in CPLD to obtain a limited amount of data to be transmitted to the remote station with a 1-10 Hz frequency, lowering the needed throughput of the wireless system, and hence the power consumption. The uncertainty on the dose and dose-rate measurements is below 10%, and the wireless transmission protocol has been found to be adequate also in the capability of establishing the connection through the operating room walls. Conclusion: The wireless dosimeter prototype, produced in the framework of the RAPID project, for personnel dosimetry of the medical staff during interventional radiology procedures, has been tested and found to be satisfactory from the power consumption, the wireless transmission capability, the precision in dose and dose-rate measurements.

RAPID: A prototype for personnel dosimetry during interventional radiology procedures

PASSERI, Daniele;PLACIDI, Pisana;SCORZONI, Andrea
2013

Abstract

Purpose: We present the tests performed on the prototype of a personal wireless dosimeter for medical staff during Interventional Radiology procedures, developed in the framework of the INFN RAPID Project. Methods and materials: The prototype is composed by a sensing element (a CMOS silicon pixel device), a real-time data reduction system (a CPLD), a control system, a wireless transmission module, a remote station for prototype configuration, control and data storage. The prototype has been irradiated in laboratory using monochromatic X-ray photons to calibrate the sensing element, then using the angiography system with a PMMA phantom, to diffuse the direct radiation, in all the working conditions (continuous/pulsed, fluoroscopy/digital radiography acquisition) and with different sensor settings. The prototype has also been exposed to a certified X-ray beam to obtain a relative calibration. Finally the sensing element of the prototype has also been used during medical procedures, mounted over the lead apron dressed by the medical staff. All the results have been compared with two control systems, a set of TLDs and an UNFORS EDD-30 system. Results: Two sensor quantities have been used to verify the linearity of the prototype's response: the number of detected photons and the total detected signal in a frame. The appropriate data reduction strategies have then been implemented in CPLD to obtain a limited amount of data to be transmitted to the remote station with a 1-10 Hz frequency, lowering the needed throughput of the wireless system, and hence the power consumption. The uncertainty on the dose and dose-rate measurements is below 10%, and the wireless transmission protocol has been found to be adequate also in the capability of establishing the connection through the operating room walls. Conclusion: The wireless dosimeter prototype, produced in the framework of the RAPID project, for personnel dosimetry of the medical staff during interventional radiology procedures, has been tested and found to be satisfactory from the power consumption, the wireless transmission capability, the precision in dose and dose-rate measurements.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/1169887
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