期刊
IEEE TRANSACTIONS ON ELECTRON DEVICES
卷 68, 期 9, 页码 4705-4710出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2021.3097315
关键词
Brazing; ceramic; dental; filament; X-ray
资金
- Bio and Medical Technology Development Program of the National Research Foundation (NRF) - Ministry of Science and ICT [NRF-2018M3A9E9024942, NRF-2016M3A9E9942010]
- National Research Council of Science and Technology (NST) grant by the Korea Government [CAP-18-03-ETRI, 1711077860]
- Ministry of Small and Medium Enterprises (SMEs) and Startups Korea [1425151329]
- National Research Council of Science & Technology (NST), Republic of Korea [CAP-18-03-ETRI] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016M3A9E9942010] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study successfully reduced the size of a dental X-ray tube by approximately 43% through the use of ceramic instead of glass, enabling smaller contact sizes and greater spatial resolutions. Both ceramic and glass sealed tubes obtained similar X-ray images of human teeth, confirming the potential of compact-size ceramic X-ray tubes in dental imaging.
A major challenge for glass X-ray tube makers is the reduction in the tube size for portable or handheld applications. Size reduction is difficult mainly due to contact size restrictions for glass-to-metal welding. In high-voltage (60-70 kV) portable applications such as dental imaging, a distance of at least 5 mm should be maintained between the anode and the glass envelope to prevent the latter from burnout, which further limits reduction in the tube's diameter. In this study, reduction in the size of a dental X-ray tube by approximately 43% is achieved by replacing the glass envelope with ceramic. Instead of welding, the ceramic body permits the use of brazing, which supports extremely small contact sizes. Additionally, due to the higher dielectric constant of ceramic, even less than 1 mm spacing is permissible between the envelope and the anode, enabling further size reduction. Despite the 43% reduction in size, limiting spatial resolutions of approximately 8 and 7 lines per mm are obtained for the ceramic and glass sealed tubes, respectively. Moreover, the two tubes obtain similar X-ray images of human teeth, verifying the potential of the compact-size ceramic X-ray tube in dental imaging.
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