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RISS 인기검색어
- 검색키워드
- 저자 : Tohru Ishida (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Extraction of Cervical Lymph Nodes Based on Three-Dimensional Image Registration
Nozomi Shime,Tohru Kamiya,Takayuki Ishida 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
One of the difficulties of cancer is the metastasis of cancer through the lymph nodes. Therefore, early detection and treatment of cancerous is important. Visual screening is one of useful tool for diagnosing of the cancer. However, the number of images obtained at a time is large, and the burden on the reading physician is increasing. Furthermore, reading of image is based on the subjective judgment of the physician, which may lead to different diagnostic results. To solve these problems, computer aided diagnosis (CAD) systems have been attracting attention in recent years. One of the CAD systems is the temporal subtraction image technology. In this paper, we propose an image alignment method for generating temporal subtraction images from images taken before and after contrast agent was administered to the cervical lymph nodes of the same subject. In addition, we propose an image analysis method that suppresses overextraction of lymph node candidate regions on the temporal subtraction image based on the features of lymph nodes. We applied the proposed method to the CT images of three sets and compared the temporal subtraction images with the final lymph node extraction images, and confirmed that the proposed method can suppress the overextraction of lymph node regions.
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Extraction of Cervical Lymph Nodes using Improved U-Net++
Nozomi Shime,Tohru Kamiya,Takayuki Ishida 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
Early detection and treatment of the lymph node are important since swelling of the neck is a likely factor in systemic metastasis of cancer. One of the diagnoses of cervical swelling is a CT scan, which has a beneficial influence on the diagnosis of the disease. However, the reading of CT images is burdened by the large number of images, which increases the physicians workload. In addition, since it is based on the subjective judgment of the physician, there may be discrepancies in diagnostic results and undetected cases due to differences in experience. A means of solving these problems requires a CAD system that provides a second opinion to the physician. Therefore, this paper proposes a segmentation method of cervical lymph node region for the purpose of developing a CAD system for the diagnosis of cervical lymphadenopathy from CT images. The proposal method is a CNN model with U-Net++ as the backbone, introducing CBAM (convolution block attention module) and dual-branch multi-scale attention module. The proposed method was applied to CT images of 11 cases, yielding IoU of 62.29, confirming its validity.
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Improved Chip Discharge in Drilling of Glass Plate Using Back Tapered Electroplated Diamond Tool
Akira Mizobuchi,Kota Honda,Tohru Ishida 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.9
Previous studies of a through-hole drilling for hard and brittle materials using electroplated diamond tool devised by the authors have led to several challenges such as a restraint of crack size at the inlet and outside, a suppression of chip adhesion on the tool and an improvement of processing efficiency. In this paper, the devised tool was redesigned in order to restrain cracks of the inlet side as well as to improve the chip discharge. The new design of the tool featured a back taper which was expected to bring an effect of restraining crack size by preventing any interference between the tool cylindrical surface and the hole inner surface during drilling process. In addition, the chip can be discharged from the drilled hole through the back taper. Results of the experiment indicated that by providing the back tapered shape, the width of the inlet hole can be reduced slightly as the interference between the glass plate and the tool cylindrical surface was suppressed. Furthermore, the adhesion of chip on tool can be restrained by using the tool with large chip discharge space as the chip was easily discharged to the outside of the hole. Moreover, an abrupt change in thrust force was not detected, and the crack width was found in small size.
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Automatic Detection of Cervical Lymph Nodes from Non-Contrast CT Images Using the SSD
Seitaro Baba,Takayuki Ishida,Tohru Kamiya 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
Cancer is the leading cause of death in Japan, and the mortality rate has not improved to date. Among cancers, oral cancer is a malignant tumor that develops in the oral cavity, and cervical lymph node metastasis prevents complete cure of oral cancer. Computed tomography (CT) imaging is often used to diagnose cervical lymph node metastasis. To take a CT imaging, contrast medium is administered to add contrast to the image, which may cause side effects. Furthermore, imaging diagnosis is subjective and lacks objectivity and may miss some lesions. In this paper, we propose an automatic cervical lymph node detection system using non-contrast CT images, aiming at reducing the burden on physicians, improving the accuracy of CT reading, and reducing the burden on patients due to the use of contrast media. The proposed method, based on an improved SSD (Single Shot Multibox Detector) can improve the AP by about 20% compared to the conventional SSD, and its usefulness is confirmed.
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Akira Mizobuchi,Mohd Sanusi Abdul Aziz,Raja Izamshah,Tohru Ishida 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.9
This research aims to identify a high-quality, efficient, and low-cost micro-hole drilling process through glass plates that employs an electroplated diamond tool with different drill bits. Three different drill bits were tested to determine how varying the chip discharge volume influences chip discharge performance, which is an important factor that affects the effectiveness of the drilling process. The chip discharge performance of each electroplated diamond tool was experimentally investigated by observing the drilling quality and the number of the drilled holes. From the experimental results, it was found that the drilled chips could not discharge smoothly when the drill bit possesses a small chip discharge volume, leading to the drill bit breaking, which thus limits the number of drilled holes. Furthermore, the changes in thrust force and the crack size were high, and there were also cracks on the drilled glass plate. However, drilling with a drill bit that possesses a larger chip discharge volume resulted in excellent chip discharge performance and increased the number of drilled holes. This type of drill bit is effective in drilling holes through glass plates, with minimum hole defects and no issues associated with chips clogging the hole during drilling.
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