• 한국기계가공학회지
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• 제18권8호
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• pp.60-66
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• 2019

This study aims to develop and manufacture a device for inspecting impurities in a sealed aluminum container using an X-ray technique. Two X-ray oscillators and detectors are used to detect the entire sample. The stage for sample movement was fabricated using two high-voltage generators and X-ray detectors arranged diagonally. In addition, the high-voltage generator is composed of a vacuum tube, a high-voltage generator, and circulating oil for cooling. It includes a control unit for controlling other equipment, a power supply unit, and a video output unit; the most important part of the X-ray is the X-ray generation part. In this study, a flat panel was used along with the aim of developing the detector part. In particular, the development of the scintillator introduced in this study is a primary focus. The developed scintillator can be combined with a lens and can then be assembled with a charge coupled device (CCD) sensor.

• 한국전기전자재료학회논문지
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• 제22권6호
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• pp.516-521
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• 2009

X-ray system which is usefully used in diagnosis of the patient, being bombed of radioactivity is a big weak point when irradiates a X-ray to the human body so that ICRP restricted the radiation exposure tolerance of the human body. In order to reduce being bombed, the many research and development is now advanced. A lots of diagnostic X-ray machines have currently used due to the increase of occurrence efficiency of X-ray and precisely the output control by using the inverter which is a high speed switching semiconductors. For getting the confidence of the X-ray machine, the same radiation occurrence, same evaluation, and same irradiation condition are necessary when evaluates X-ray irradiation. It is the most important part for the accuracy of the test result and the patient safety. This research has produced the high voltage occurrence system of full-wave rectification method by using the LC resonance inverter, and evaluated the irradiation reproducibility in order to use it in diagnosis of the patient.

• 한국전기전자재료학회논문지
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• 제23권7호
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• pp.534-538
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• 2010

X-ray systems for medical treatment use noninvasive procedures. Being capable of locally inspecting the inside of the body, X-ray systems are routinely used for basic diagnosis. X-ray systems to be used for medical purposes were originally made with a gas filled tube inside an induction coil in the initial stages of development but with this approach it becomes difficult to take a satisfactory picture through thick body sections, non invasively. However continued development made it possible to take non-invasive pictures of breasts, blood vessels and other body parts through thick body sections. Recently, high-voltage X-ray generators of more compact size, increased generation efficiency, and sophisticated output control have become possible. All of these features are made possible by the use of a high-frequency output from an inverter and a fast switching semiconductor device. In this paper, we describe a new X-ray generator operating with a resonant inverter in order to reduce switching loss and high frequency noise. In addition, in order to identify the differences amongst types of rectification, we have compared output and the quality of X-ray pictures obtained with full-wave rectification and dual-voltage rectification methods.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.128-128
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• 2010

The high-voltage X-ray generator recently used is very popular, because that can be miniaturized, increased in generating efficiency, elaborated in output control. All these features are available with high-frequency made by using an inverter, the fast switching semiconductor device. In this paper to identify the differences among types of rectification, we compared output ripple with full-wave rectification and dual-voltage rectification methods.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 추계학술대회
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• pp.771-772
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• 2010

환자의 진단에 유용하게 사용되고 있는 X선 장치는 X선을 인체에 조사할 때 나타나는 피폭이 큰 단점으로 지적되고 있으며 ICRP에서는 인체의 방사선 노출 허용량을 제한하고 있다. 이러한 피폭을 줄이기 위해 많은 연구 개발이 진행되고 있다. 본 연구에서는 X선의 발생 효율 증가 및 정밀한 출력 제어가 가능한 인버터 방식의 고전압 발생장치를 제작하였다. 또한 X선관에 인가되는 직류 고전압에 발생 가능한 리플을 최소화하기 위해 전파 정류방식을 적용하였으며, 이를 환자의 진단에 사용하기 위해 조사재현성 및 선질을 평가하였다.

• 한국산학기술학회논문지
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• 제2권2호
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• pp.11-18
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• 2001

본 연구에서는 의료용 X선 발생기의 고전압 발생장치를 설계하는 방법을 제시한다. 고전압의 발생을 위해 인버터를 사용하였다. 또한 라인필터회로, 정류회로, 펄스 복 변조 제어회로, 전 브리지 구동회로, 고전압 트랜스, 고전압 정류회로를 설계 제작하였다. 본 논문에서 제시된 설계 방법에 의해 스위칭 주파수 40 KHz인 고전압 발생장치를 제작·실험하여 가변전압 0∼620 V. 가변전류 50 ∼500 mA를 얻었다.

• 전기전자학회논문지
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• 제22권2호
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• pp.495-498
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• 2018

본 논문에서는 의료 및 산업용 X-선 발생장치의 선량평가를 위한 면적선량계(DAP)의 시스템을 제안한다. 제안하는 시스템은 Ion-Chamber를 이용한 면적선량 측정기술을 기반으로 진단용 X-선 장치에 의해 발생된 피폭선량을 명확히 측정할 수 있다. 면적선량계의 하드웨어부는 공기 중에서 X-선에 의해 전리되는 전하의 양을 측정한다. 미소 전류를 통한 누적선량 측정을 위한 고속 처리 알고리즘부는 입력 손실 없이 낮은 구현비용(전력)으로 X-선에 의해 전리되는 전하의 양을 측정한다. X-선 발생장치의 동작에 동기화된 유무선 송수신 프로토콜부는 통신 속도를 향상시킨다. 연동 및 에이징을 위한 PC 기반 제어 프로그램부는 실시간으로 발생된 X-선량을 측정하여 PC용 GUI를 통해 측정 그래프 및 수치 모니터링이 가능하도록 한다. 제안된 시스템의 성능을 공인시험기관에서 평가한 결과, 각각의 에너지 대역(30, 60, 100, 150kV)에서 면적선량계에 측정되는 값이 선형적으로 증가됨을 확인할 수가 있었다. 또한 4등분한 지점에서 측정기의 지시치에 대한 표준편차가 ${\pm}1.25%$를 나타내어서 면적선량계가 위치에 관계없이 균일한 측정값을 나타냄을 확인하였다. 한편, ${\pm}4.2%$의 불확도가 측정되어서 국제 표준인 ${\pm}15%$ 이하에서 정상동작 됨이 확인되었다.

• 대한방사선기술학회지:방사선기술과학
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• 제15권1호
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• pp.107-113
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• 1992

Inverter type X-ray apparatus has been introduced and used several hospitals. Principle of inverter type X-ray generators are such as to convert the frequency of commercial power supply to high frequency and to control the high voltages for X-ray tube. Inverter generators are now on the way for futher development to elliminate single phase generators and three phase generators. We compared inverter type X-ray apparatus with conventional single phase 2 peak and three phase 12 peak, apparatus in the following aspects X-ray out put to tube voltage, linearity of X-ray out put to mA, HVL according to mA contrast to kV.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.26-29
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• 2000

The conventional types of X-ray generators were bulky in physical size and heavy in weight and the control accuracies of the output voltages were not always satisfacotry. The high frequency switching inverter and converter technology on power conversion and control systems have been greatly closed up introducing power semiconducot devices. To decreasing the volume and the weight of high voltage transformer and to stabilize ripple. In this paper the newly developed x-ray generator in a low cost using duty modulation PWM inverter. This system verify improved performance by stabilize ripple of X-ray tube voltage and compared the reproducibility linearity and dose in single phase three phase and PSU.

• 전자통신동향분석
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• 제34권5호
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• pp.1-13
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• 2019

In modern times, X-ray imaging has become a necessary tool for early diagnosis, quality control, nondestructive testing, and security screening. X-ray imaging equipment generally comprises an X-ray generator and an image sensor. Most commercially available X-ray generators employ filament-thermionic electron-based X-ray tubes, thus demonstrating typical analog behavior, such as slow response and large stray X-rays. Furthermore, digital X-ray sources, which have been studied extensively using field electron emitters manufactured from nanometer-scale materials, provide fast and accurately controlled ultra-shot X-rays. This could usher in a new era of X-ray imaging in medical diagnosis and nondestructive inspections. Specifically, digital X-ray sources, with reduced X-ray dose, can significantly improve the temporal and spatial resolution of fluoroscopy and computed tomography. Recently, digital X-ray tube technologies based on carbon nanotubes, developed by Electronics and Telecommunications Research Institute, have been transferred to several companies and commercialized for dental imaging for the first time.