• Title/Summary/Keyword: diagnostic x-ray

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X-ray properties measurement of Flat panel Digital X-ray gas detector (평판형 디지털 엑스레이 가스 검출기의 엑스선 특성 측정기술에 관한 연구)

  • Yoon, Min-Seok;Cho, Sung-Ho;Oh, Kyung-Min;Jung, Suk-Hee;Nam, Sang-Hee;Park, Ji-Goon
    • Journal of the Korean Society of Radiology
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    • v.3 no.1
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    • pp.17-21
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    • 2009
  • The Recently, large area matrix-addressed image detectors are investigated for X-ray imaging with medical diagnostic and other applications. In this paper, a new flat panel gas detector for diagnostic X-ray imaging is proposed, and its characteristics are investigated. The research of flat panel gas detector is not exist at all. Because of difficulty to inject gas against to atmospheric pressure. So almost gas detector made by chamber shape. We made flat panel sample by display technique. (ex: PDP, Fed, etc.) The experimental measurements, the transparent electrodes, dielectric layer, and the MgO protection layer were formed in front glass. And, the X-ray phosphor layer and address electrodes are formed in the rare glass. The dark current, the x-ray sensitivity and linearity as a function of electric field were measured to investigate the electrical properties. From the results, the stabilized dark current density and the significant x-ray sensitivity were obtained. And the good linearity as a function of exposure dose was showed in wide diagnostic energy range. These results means that the passive matrix-addressed flat panel gas detector can be used for digital x-ray imaging.

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Evaluation of the Reproducibility of Radiation Output from Diagnostic X-ray Equipment(Standards Based on IEC 60601-2-54) (진단용 X선 장치에서 방사선출력의 재현성 평가(IEC 60601-2-54 표준규격을 기반으로))

  • Han, Beom-Hee;Jung, Hong-Ryang;Lim, Cheong-Hwan;Kim, Chong-Yeal;Lee, Sang-Ho;Han, Sang-Hyun;Hong, Dong-Hee;Kim, Chang-Gyu;You, In-Gyu;Mo, Eun-Hee
    • Journal of Digital Convergence
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    • v.12 no.2
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    • pp.555-561
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    • 2014
  • For five diagnostic X-ray generators (DR), four units turned out to be appropriate in tests on the reproducibility of radiation output suggested in the IEC 60601-2-54 standard, but in one unit of the X-ray equipment, an item measured in a combination of 50% of the highest tube voltage of the diagnostic X-ray equipment, the test setting of Group C with authorized output doses between $1{\mu}Gy$ and $5{\mu}Gy$ of mAs turned out to be inappropriate. As a result, the radiation dose to the IEC 60601-2-54 standard for quantification standards proposed by the radiation output from diagnostic X-ray imaging device reproducibility of performance management should be aware that an important evaluation factor.

Development of Mobile X-ray equipment for medicine (의료용 모바일 X선 장치의 개발)

  • Kim, Tae-Gon;Kim, Young-Pyo;Cheon, Min-Woo;Park, Yong-Pil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2010.10a
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    • pp.762-763
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    • 2010
  • The X-ray device used for medical treatment is classified into fixed type that is used by installing at the location with the stable power supply and mobile type that can be taken by moving the X-ray device to the location where a patient is. Mobile X-ray device which is typically used in the mobile type of X-ray can be used very usefully beyond the space restriction. However, due to its difficulty to generate high-voltage, it is mainly applied to take hand and foot shootings which only need low output power. In this study, by designing and producing the large volume of mobile X-ray device which doesn't have the limitations on diagnostic areas of the body, the operating characteristics of device according to the loading change was identified.

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Radiation attenuation and elemental composition of locally available ceramic tiles as potential radiation shielding materials for diagnostic X-ray rooms

  • Mohd Aizuddin Zakaria;Mohammad Khairul Azhar Abdul Razab;Mohd Zulfadli Adenan;Muhammad Zabidi Ahmad;Suffian Mohamad Tajudin;Damilola Oluwafemi Samson;Mohd Zahri Abdul Aziz
    • Nuclear Engineering and Technology
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    • v.56 no.1
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    • pp.301-308
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    • 2024
  • Ceramic materials are being explored as alternatives to toxic lead sheets for radiation shielding due to their favorable properties like durability, thermal stability, and aesthetic appeal. However, crafting effective ceramics for radiation shielding entails complex processes, raising production costs. To investigate local viability, this study evaluated Malaysian ceramic tiles for shielding in diagnostic X-ray rooms. Different ceramics in terms of density and thickness were selected from local manufacturers. Energy Dispersive X-ray Fluorescence (EDXRF) and X-ray Fluorescence (XRF) characterized ceramic compositions, while Monte Carlo Particle and Heavy Ion Transport code System (MC PHITS) simulations determined Linear Attenuation Coefficient (LAC), Half-value Layer (HVL), Mass Attenuation Coefficient (MAC), and Mean Free Path (MFP) within the 40-150 kV energy range. Comparative analysis between MC PHITS simulations and real setups was conducted. The C3-S9 ceramic sample, known for homogeneous full-color structure, showcased superior shielding attributes, attributed to its high density and iron content. Notably, energy levels considerably impacted radiation penetration. Overall, C3-S9 demonstrated strong shielding performance, underlining Malaysia's potential ceramic tile resources for X-ray room radiation shielding.

Calculation of Shielding Rate of Radiation Protective Equipment Using the X-ray Spectrum of IPEM Report-78 (IPEM Report-78의 엑스선 스펙트럼을 이용한 방사선 방호장비의 차폐율 계산)

  • Han, Dong-Hyun
    • Journal of the Korean Society of Radiology
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    • v.15 no.5
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    • pp.755-760
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    • 2021
  • In this study, the shielding rate of major X-ray protective equipment used in the medical environment was calculated using X-ray spectrum data emitted from the diagnostic X-ray generator of The Institute of Physics and Engineering(IPEM) Report-78, and the applicability of radiation protection was investigated. Radiation shielding rates were calculated through reduction rates of air-kerma and total intensity for lead apron (0.3 mmPb), thyroid shield (0.5 mmPb), lead goggles (0.5 mmPb), and lead glass (1.8, 2.7, 3.3 mmPb) used for diagnostic X-ray protection. As a result, the shielding rate calculated as the air kerma reduction rate ranged from 96.31 to 100% at 80 kV, and 90.35 to 100% at 120 kV. In addition, the results of this calculation were well matched with the results of previous studies measuring the actual shielding rate, and it is expected that the X-ray spectrum data of IPEM Report-78 can be used for radiation protection.

A Study on the Clinical Application of Intelligent Replenishment System of Automatic X-ray Film Processor Based on Film Density (자동현상 지능화 보충방식의 임상적응에 관한 연구)

  • Lee, W.H.;Suh, S.S.;In, K.H.;Lee, H.J.;Kim, K.C.;Yoon, C.H.;Auh, Y.H.
    • Journal of radiological science and technology
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    • v.22 no.1
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    • pp.49-53
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    • 1999
  • To inquire its usefulness of the clinical application of intelligent replenishment system of automatic X-ray film processor based on film density, we processed the serial 300 sheets of radiographic film of chest [$14{\times}14"$, HR-C type] and bone [elbow & ankle($8{\times}10"$), skull($10{\times}12"$), hand & foot($11{\times}14"$), pelvis($14{\times}17"$), HR-G type, 68, 70, 77, 85 sheets respectively]. We analyzed the characteristic corves, relative speeds, average gradients and base plus fog densities every twenty five sheets. We also evaluated the developer and fixer replenishment volumes every that time. In the chest and bone radiograph two all, the characteristic curves were little change, and the relative speeds, average gradients and base plus fog densities were within the maximum control limits. The average developer replenishment volumes were about 43m1/sheet and 39m1/sheet respectively. It brings decreased results about 29% in comparison with the conventional replenishment system. In our experiences, we conclude that the intelligent replenishment system of automatic X-ray film processor based on film density maintains image quality consistently, decreases also the replenishment volumes. Therefore, this system will be resulted in economic and environmental effects, and solve problems of over and low replenishment volume.

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Physical Properties of Heavy Elements as Filter in Diagnostic Radiology (진단방사선영역에서 중원소 여과판의 물리적 특성)

  • Kim, Y.K.;Lee, K.S.
    • Proceedings of the KIEE Conference
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    • 1999.07d
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    • pp.1977-1979
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    • 1999
  • This work characterized in terms of the physical properties of heavy elements as reduction filter in the diagnostic radiology. From the results of experimental evaluation, it was founded that in the case of the Ho filter, the variety of X-ray property with kVp was less than those of Ba, Cu and Al. And the ratio of transit-dose to surface and the load of X-ray tube were increased in the order of Al, Ba, Cu and Ho. The contrast of X-ray image showed the higher value in the order of Cu, Al, Ba and Ho.

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Clinical Evaluation of Wide-latitude HR-C Film for Chest Radiography (흉부촬영용 HR-C 필름의 임상평가)

  • Kim, Young-Sung;Hwang, Nam-Sun;Yeo, Young-Bok;Lee, In-Ja;Huh, Joon
    • Journal of radiological science and technology
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    • v.13 no.1
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    • pp.19-24
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    • 1990
  • In appilcation of wide latitude HR-C film to chest x-ray examination, former x-ray diagnosis area is larger and diagnostic information has great deal of promotion. HR-C film is compare to former x-ray film is larger latitude and density level is small, reading is very easily. Especially, high estimate that is in characteristic curve linearity of toe part is good, contrast of low density made good shape and not good describe to overlap is diagnostic information increase mediastinum portion etc.

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A Study on Radiation Quality of the Diagnostic X-ray Equipments (진단용(診斷用) X-선장치(線裝置)의 선질(線質) 특성(特性)에 관(關)한 연구(硏究))

  • Park, Myeong-Hwan;Lee, Joon-Il
    • Journal of radiological science and technology
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    • v.20 no.1
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    • pp.55-59
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    • 1997
  • The quality of continuous X-ray beam depends upon the half value layer which varies according to the geometric conditions, filtration thickness, and tube voltage. We compared the inverter type X-ray equipment with the conventional single phase 2 peak and the three phase 12 peak for the quality obtained by changes of the added filter thickness and the tube voltage. The quality of single phase 2 peak X-ray generator showed increase for the added filter and the tube volt-age. The half value layer is Increased the thicker the filter and the higher the kVp. The quality of the Inverter type and the three phase 12 peak in comparison with the single phase 2 peak X-ray generator is increased.

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A Thoracic Spine Segmentation Technique for Automatic Extraction of VHS and Cobb Angle from X-ray Images (X-ray 영상에서 VHS와 콥 각도 자동 추출을 위한 흉추 분할 기법)

  • Ye-Eun, Lee;Seung-Hwa, Han;Dong-Gyu, Lee;Ho-Joon, Kim
    • KIPS Transactions on Software and Data Engineering
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    • v.12 no.1
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    • pp.51-58
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    • 2023
  • In this paper, we propose an organ segmentation technique for the automatic extraction of medical diagnostic indicators from X-ray images. In order to calculate diagnostic indicators of heart disease and spinal disease such as VHS(vertebral heart scale) and Cobb angle, it is necessary to accurately segment the thoracic spine, carina, and heart in a chest X-ray image. A deep neural network model in which the high-resolution representation of the image for each layer and the structure converted into a low-resolution feature map are connected in parallel was adopted. This structure enables the relative position information in the image to be effectively reflected in the segmentation process. It is shown that learning performance can be improved by combining the OCR module, in which pixel information and object information are mutually interacted in a multi-step process, and the channel attention module, which allows each channel of the network to be reflected as different weight values. In addition, a method of augmenting learning data is presented in order to provide robust performance against changes in the position, shape, and size of the subject in the X-ray image. The effectiveness of the proposed theory was evaluated through an experiment using 145 human chest X-ray images and 118 animal X-ray images.