Ms. Shengzi Wang Profile

Shengzi Wang

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Proceedings Article | 15 October 2021 Paper

A new method for swallowing detection with binocular vision during radiotherapy

Zhipeng Zhu, Ji Li, Linyong Shen, Wei Song, Jinwu Qian, Ya’nan Zhang, Shengzi Wang

Proceedings Volume 11933, 1193317 (2021) https://doi.org/10.1117/12.2615156

KEYWORDS: Radiotherapy, Cartilage, Throat, Feature extraction, Signal processing

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During the irradiation of laryngeal cancer, the motion caused by swallowing of patients leads to the nidus deviating from the target area, which results the decrease of therapeutic effect and the waste of dose. Therefore, it is necessary to detect the displacement, time and number of swallowing during radiotherapy. In this paper, a non-contact and non-invasive swallowing detection method based on binocular vision is proposed, which detects swallowing by capturing the motion of thyroid cartilage. In our method, first a marker is used to highlight the characteristics of thyroid cartilage; Second, an improved matching method was used to match the feature points; Then the three-dimensional shape of the thyroid cartilage was established for the identification of laryngeal prominence and extraction of motion signals. Finally, the signals were processed to obtain the number, displacement and time of swallowing. Experiments were carried out on healthy people. The results show that our method is feasible for detecting the number and time of swallowing movement, and can measure the displacement in three dimensions.

Proceedings Article | 16 October 2019 Paper

A swallowing detection method based on FBG sensor for radiotherapy

Zhongyan AI, Linyong Shen, Ya'nan Zhang, Ji Li, Shengzi Wang, Jinwu Qian

Proceedings Volume 11205, 112050N (2019) https://doi.org/10.1117/12.2542221

KEYWORDS: Sensors, Fiber Bragg gratings, Radiotherapy, Cartilage, Throat, Tumors

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During the radiation therapy of the laryngeal tumor, the laryngeal motion occurred from swallowing can cause the tumor to move away from the radiation area and lead to a decline in treatment efficiency. Therefore, to detect the time of swallowing of a laryngeal cancer patient is essential for later remedial measures. However, since metal occlusion cannot be contained in front of the irradiation rays, many conventional detection methods cannot be used. This paper presents a Fiber Bragg Grating (FBG) based method for swallowing detection. The FBG sensor is attached to the thyroid cartilage of the human throat. The movement of the thyroid cartilage during the bending causes the FBG sensor to bend, causing the wavelength of the reflected light of the sensor to change. The change of the wavelength of the reflected light reflects the movement of the thyroid cartilage. In the experiment of healthy adults, both the camera and the FBG sensor were used to detect the movement of the throat during swallowing. The results of the camera detection were compared with the results of the sensor detection. The result illustrates that the FBG sensor can correctly count swallows and efficiently detect the swallowing movement time.

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