Improving bleeding detector features for electron intraoperative radiotherapy

Sanchís, E.; Casans, S.; Garcı́a-Gil, R.; Martos, Julio; Sanchís-Sánchez, Enrique; Pérez-Calatayud, Ignacio; Pérez-Calatayud, M.J.; Pérez-Calatayud, J.

doi:10.1016/j.ejmp.2019.08.015

Cited by 5 publications

(13 citation statements)

References 13 publications

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“…It is based on a capacitive sensor (C x in Fig. 1) as described in [10,11] and an electronic conditioning circuit based on AC bridge as described in [12]. It also includes a wireless power supply necessary to charge a supercapacitor (SC in Fig.…”

Section: Read-out Circuitmentioning

confidence: 99%

“…The sensor geometry is described in [11]. It is based on two capacitive plates, each one formed by a set of strips (Fig.…”

Section: Read-out Circuitmentioning

confidence: 99%

“…To avoid this important risk, the existence of detectors that can show this circumstance is very useful in the clinic. A capacitive based bleeding detector was proposed by Sanchis et al and Garcia-Gil et al [10][11][12] for translucent polymethyl methacrylate applicators (PMMA), as used in the LIAC HWL Mobile linac from Sordina IORT Technologies [13]. A simple capacitive-based detector using a semi-circular geometry was presented in [10].…”

Section: Introductionmentioning

confidence: 99%

“…In this detector, the measurement process was based on repetitive charge-discharge cycles of the capacitor through a resistor. A capacitive-based detector using a geometry based on two capacitive plates each one formed by a set of strips was presented in [11]. In this contribution, improvements were focused on minimizing the impact of the detector on the visual through the plastic applicators as well as avoiding the asymmetry in the detection capability when the applicator is tilted.…”

Section: Introductionmentioning

confidence: 99%

“…In this contribution, improvements were focused on minimizing the impact of the detector on the visual through the plastic applicators as well as avoiding the asymmetry in the detection capability when the applicator is tilted. Finally, the whole electronic design of the bleeding detector presented in [11] was analysed in [12].…”

Section: Introductionmentioning

confidence: 99%

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Embedded bleeding detector into a PMMA applicator for electron intraoperative radiotherapy

et al. 2022

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The aim of this work is to present a ready to industrialize low-cost and easy-to-install bleeding detector for use in intraoperative electron radiation therapy (IOERT). The detector works in stand-alone mode and is embedded into a translucent polymethylmethacrylate (PMMA) applicator avoiding any contact with the patient, which represent a novelty compared to previous designs. The use of this detector will prevent dose misadministration during irradiation in the event of accumulation of fluids in the applicator. Methods: The detector is based on capacitive sensor and wireless power-supply electronics. Both sensor and electronics have been embedded in the applicator, so that any contact with the patient would be avoided. Since access to the tumor can be done through different trajectories, the detector has been calibrated for different tilting angles. Results: The result of the calibration provides us with a fit curve that allows the interpolation of the results at any angle. Comparison of estimated fluid height vs real height gives an error of 1 mm for tilting angles less than 10 • and 2 mm for tilting angles greater than 15 • . This accuracy is better than the one required by clinic. Conclusions: The performance of the bleeding detector was evaluated in situ. No interference was observed between the detector and the beam. In addition, a user-friendly mobile application has been developed to help the surgical team making decisions before and during irradiation. The measurement provided by the mobile application was stable during the irradiation process.

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Section: Read-out Circuitmentioning

confidence: 99%

“…The sensor geometry is described in [11]. It is based on two capacitive plates, each one formed by a set of strips (Fig.…”

Section: Read-out Circuitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Embedded bleeding detector into a PMMA applicator for electron intraoperative radiotherapy

et al. 2022

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Monte Carlo flattening filter design to high energy intraoperative electron beam homogenization

Oliver

Vijande

Tejedor-Aguilar

et al. 2023

Radiation Physics and Chemistry

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Calibration and validation of a bleeding detector for beveled PMMA applicators in electron intraoperative radiotherapy

Garcia-Gil,

Casans,

Navarro-Antón

et al. 2024

Meas. Sci. Technol.

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Purpose: This study aimed to calibrate and validate a capacitive-sensor bleeding detector, originally designed for flat applicators, with beveled applicators (bPMMA), which are among the most commonly used applicators in intraoperative radiotherapy with electron mobile linacs. The detector will help prevent dose misadministration during irradiation in the event of fluid accumulation in the applicator, thus allowing for appropriate intervention. The handicap with employing this detector for bPMMA stems from the fact that the level of accumulated fluid depends on both the tilting angle and orientation of the applicator. Furthermore, the fluid remains accumulated at the bottom corner of the applicator, reducing the sensitivity of the sensor. Methods: A 5-strip capacitive sensor has been used, attached to a 4 cm diameter 30º beveled applicator with a tilting angle range from 0º to 30º. The sensor is read out using dedicated electronics, including a Wheatstone bridge circuit, amplifier, filter stages, and microcontroller. To calculate the sensitivity of the sensor, a prior calibration of the circuit has been carried out in order to obtain the relationship between the output voltage of the conditioning circuit and the height of the fluid present in the applicator for different inclinations. Results: Using the average sensitivity over the inclination range of interest can provide accurate measurements of the estimated fluid height up to 12 mm, with a maximum deviation of approximately 2.0 mm and less than 1.0 mm for the 5 mm clinic threshold. Conclusions: The use of the mean sensitivity is a practical approach for detecting bleeding in beveled applicators because it simplifies the measurement process by avoiding the need to obtain detector sensitivity for each inclination and orientation of the applicator, which would be complex if not impractical in clinical use.

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Improving bleeding detector features for electron intraoperative radiotherapy

Cited by 5 publications

References 13 publications

Embedded bleeding detector into a PMMA applicator for electron intraoperative radiotherapy

Embedded bleeding detector into a PMMA applicator for electron intraoperative radiotherapy

Monte Carlo flattening filter design to high energy intraoperative electron beam homogenization

Calibration and validation of a bleeding detector for beveled PMMA applicators in electron intraoperative radiotherapy

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