• 제목/요약/키워드: X-Ray CT

검색결과 949건 처리시간 0.027초

3D 프린팅을 활용한 일반 X선 촬영 실습용 인체 팬텀 제작 (Making Human Phantom for X-ray Practice with 3D Printing)

  • 최우전;김동현
    • 한국방사선학회논문지
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    • 제11권5호
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    • pp.371-377
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    • 2017
  • 일반 X선 촬영 실습용 팬텀은 방사선학과에 없어서는 안 되는 중요한 교재나 기존의 시판되는 팬텀은 고가의 수입품이기에 다양한 종류의 팬텀을 갖추는 것이 어렵다. 3D 프린팅 기술을 활용해 일반 X선 촬영 실습용 팬텀을 더욱 저렴하고 간편하게 제작해 보고자 한다. CT 영상 데이터를 기반으로 제작한 골격 모형을 FDM(Fused Deposition Modeling) 방식의 3D printer를 이용해 출력한 골격 모형을 일반 X선 촬영 실습용 팬텀으로써 사용해 보고자 한다. 3D slicer 4.7.0 프로그램을 이용해 CT DICOM 영상 데이터를 STL 파일로 변환하고 G-code 변환 과정을 거쳐 3D 프린터로 출력하여 골격 모형을 제작한다. 완성된 팬텀을 X선 촬영, CT 촬영하여 실제 의료 영상, 시판되는 팬텀과 비교해 본 결과 실제 의료영상과 골 밀도 등의 세부적인 차이가 존재하였으나 실습용 팬텀으로써 활용할 수 있다고 판단되었다. 저가화되어 보급된 3D 프린터와 연구용으로 무료 배포된 3D slicer 프로그램을 활용하여 저렴하면서도 일반 X선 촬영 실습에 사용하는 것이 가능한 팬텀을 제작할 수 있었다. 앞으로의 3D 프린팅 기술의 다양화와 연구에 따라 보건 교육, 의료 서비스 등 여러 분야에 적용하는 것이 가능할 것이다.

3D 동영상획득을 위한 Cone-Beam 형 X-Ray CT 시스템 구현에 관한 연구 (The Study on the Implementation of the X-Ray CT System Using the Cone-Beam for the 3D Dynamic Image Acquisition)

  • 정찬웅;전계석
    • 한국음향학회지
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    • 제28권4호
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    • pp.370-374
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    • 2009
  • 본 논문에서는 3차원 동영상을 구현하기 위하여 인체에 유해한 방사능 피폭량이 부챗살 형태의 Fan Beam 보다 상대적으로 적은 원추형 Cone Beam CT 시스템을 설계하였다. 설계된 시스템은 X-ray가 조사된 각도에서 획득한 데이터를 영상처리부로 전송하고 영상을 구성하는 계산 속도를 빠르게 하기 위하여 초월함수가 보다 적은 3단계 회전 행렬을 이용하여 3차원 영상을 구현하는 회전 기반법을 사용하였다. 본 연구에서는 3차원 영상을 구성하는 시간단축을 통해 초당 3~5장의 영상을 얻음으로써 3차원 동영상을 실시간으로 구현하였다.

Application of X-ray Computer Tomography (CT) in Cattle Production

  • Hollo, G.;Szucs, E.;Tozser, J.;Hollo, I.;Repa, I.
    • Asian-Australasian Journal of Animal Sciences
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    • 제20권12호
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    • pp.1901-1908
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    • 2007
  • The aim of this series of experiments was to examine the opportunity for application of X-ray computer tomography (CT) in cattle production. Firstly, tissue composition of M. longissimus dorsi (LD) cuts between the $11-13^{th}$ ribs (in Exp 1. between the $9-11^{th}$ ribs), was determined by CT and correlated with tissue composition of intact half carcasses prior to dissection and tissue separation. Altogether, 207 animals of different breeds and genders were used in the study. In Exp. 2 and 3, samples were taken from LD cuts, dissected and chemical composition of muscle homogenates was analysed by conventional procedures. Correlation coefficients were calculated among slaughter records, tissues in whole carcasses and tissue composition of rib samples. Results indicated that tissue composition of rib samples determined by CT closely correlated with tissue composition results by dissection of whole carcasses. The findings revealed that figures obtained by CT correlate well with the dissection results of entire carcasses (meat, bone, fat). Close three-way coefficients of correlation (r = 0.80-0.97) were calculated among rib eye area, volume of cut, pixel-sum of adipose tissue determined by CT and intramuscular fat or adipose tissue in entire carcasses. Estimation of tissue composition of carcasses using equations including only CT-data as independent variables proved to be less reliable in prediction of lean meat and bone in carcass ($R^2 = 0.51-0.86$) than for fat (($R^2 = 0.83-0.89$). However, when cold half carcass weight was also included in the equation, the coefficient of determination exceeded $R^2 = 0.90$. In Exp. 3 tissue composition of rib samples by CT were compared to the results of EUROP carcass classification. Findings revealed that CT analysis has higher predictive value in estimation of actual tissue composition of cattle carcasses than EUROP carcass classification.

Identification and Three-Dimensional Characterization of Micropore Networks Developed in Granite using Micro-Focus X-ray CT

  • Choo, Chang-Oh;Takahashi, Manabu;Jeong, Gyo-Cheol
    • 지질공학
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    • 제24권2호
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    • pp.179-189
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    • 2014
  • We analyzed the three-dimensional distribution of micropores and internal structures in both fresh and weathered granite using micro-focus X-ray computed tomography (micro-CT). Results show that the pore radius in fresh granite is mostly in the range of $17-50{\mu}m$, the throat radius is in the range of $5-25{\mu}m$, and the coordination number (CN) of pores is less than 10. In contrast, the pore radius in weathered granite is mostly in the range of $20-80{\mu}m$, the throat radius is in the range of $8-30{\mu}m$, and the CN is less than 12. In general, a positive linear relationship exists between pore radius and CN. In addition, both the size and the density of pores increase with an increasing degree of rock weathering. The size of the throats that connect the pores also increases with an increasing degree of weathering, which induces fracture propagation in rocks. Micro-CT is a powerful and versatile approach for investigating the three-dimensional distributions of pores and fracture structures in rocks, and for quantitatively assessing the degree of pore connectivity.

응급 다발성 외상환자의 기본적 방사선 촬영부위에 관한 조사연구 (The Retrospective Study of Essential X-ray in Emergency Multiple Trauma Patients)

  • 유병규
    • 대한방사선기술학회지:방사선기술과학
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    • 제19권2호
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    • pp.51-57
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    • 1996
  • Radiography should be used judiciously and should not delay patients resuscitation. In the patient with emergency multiple trauma, three radiography should be obtained-cervical spine, anteroposterior(AP) chest, and AP pelvis. These examinations can be done in the resuscitation area, usually with a portable X-ray unit, but should not interrupt the resuscitation process. A retrospective study was carried on 157 emergency multiple trauma patients who were admitted to Yong Dong Severance Hospital from January, to December in 1995. I analyzed the types of X-ray examinations in emergency multiple trauma patients, and classified the patients by disoriented group of mentality. The results were as follows: 1. The subjects were 7.1%(157patients) of 2,208 trauma patients(7.3%) in total 30,085 emergency patients. 2. Male to female ratio was 2.57 : 1. The age distribution was highest from 31 years to 40 years(28.0% ). 3. The peak time of patient's entrance in emergency center was between 8 : 00 pm and 2 : 00 am(36.9%), and second peak time was between 2 : 00 pm and 8 : 00 pm (29.3%). 4. According to the injury type, traffic accident, motorcycle accident and falling down were 71.3%, 8.3% and 20.4% respectively. 5. According to the exposure rate of Computed Tomography, chest CT, cervical CT pelvis CT and brain CT were 39.5%, 24.2%, 69.4% and 51.6% respectively.

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Nondestructive Evaluation of Microstructure of SiCf/SiC Composites by X-Ray Computed Microtomography

  • Kim, Weon-Ju;Kim, Daejong;Jung, Choong Hwan;Park, Ji Yeon;Snead, Lance L.
    • 한국세라믹학회지
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    • 제50권6호
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    • pp.378-383
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    • 2013
  • Continuous fiber-reinforced ceramic matrix composites (CFCCs) have a complex distribution of porosity, consisting of interfiber micro pores and interbundle/interply macro pores. Owing to the complex geometry of the pores and fiber architecture, it is difficult to obtain representative microstructural features throughout the specimen volume with conventional, destructive ceramographic approaches. In this study, we introduce X-ray computed microtomography (X-ray ${\mu}CT$) to nondestructively analyze the microstructures of disk shaped and tubular $SiC_f$/SiC composites fabricated by the chemical vapor infiltration (CVI) method. The disk specimen made by stacking plain-woven SiC fabrics exhibited periodic, large fluctuation of porosity in the stacking direction but much less variation of porosity perpendicular to the fabric planes. The X-ray ${\mu}CT$ evaluation of the microstructure was also effectively utilized to improve the fabrication process of the triple-layered tubular SiC composite.

한방 원격 검진 시스템에서의 DICOM에 의거한 이미지데이터의 저장 및 검색모듈 개발 (Development of Dicom Image Saving and Retrieval Module in Remote Oriental Medicine Examination System)

  • 김인태;이혜정;정성태
    • 한국멀티미디어학회:학술대회논문집
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    • 한국멀티미디어학회 1998년도 추계학술발표논문집
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    • pp.321-326
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    • 1998
  • 본 연구에서는 환자와 한의사, 방사선 전문의 간에 초고속 통신망을 이용하여 원격으로 환자의 질환 상태를 파악하고 이에 따른 처방전을 내릴 수 있도록 하는 한방 원격 검진 시스템에서 환자의 X-ray 사진, CT 사진 등의 방사선 이미지들을 DICOM 프로토콜에 의거하여 저장하고 검색할 수 있도록 해주는 시스템을 구현하였다. 본 연구에서는 이미지 처리 및 관리 모듈을 Java 언어를 이용하여 구현함으로써 방사선 전문의와 한의사들이 컴퓨터의 기종에 관계없이 웹브러우저를 사용하여 환자의 X-ray나 CT 등의 방사선 사진을 살펴볼 수 있도록 하였다.

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적응 양자화를 위한 의료 영상 정보의 변환 부호화에 관한 연구 (A Study Transform Coding of Medical Image Using Adaptive Quantization Method)

  • 한영오;박장춘
    • 대한의용생체공학회:의공학회지
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    • 제10권3호
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    • pp.243-252
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    • 1989
  • In this study, medical images, which are X-ray image and CT image, are compressed by the adam live coding technique. The medical images may be treated as special ones, because they are different from general images in many respects. The statistical characteristics that medical images only have in transform domain are analyzed, and then the improved quantization method is proposed for medical images. For chest X-ray image and CT head image, the better results are obtained by the improved adaptive coding technique.

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퍼지 이론을 이용한 의료 영상 특징 추출에 관한 연구 (A study on segmentation of medical image using fuzzy set theory)

  • 김형석;한영오;박상희
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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    • pp.741-745
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    • 1991
  • This paper describes a feature extraction in digitized chest X-ray image and CT head Image. There are Extraction, Thresholding, Region G rowing, Split-Merge and Relaxation in feature extraction technique. In this study, Region Growing System was realized and Fuzzy Set Theory was applied in order to extract the vague region which the conventional method has difficulties in extracting. The performance of proposed algorithm was proved by being applied to chest X-ray image and CT head image.

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APPLICATION OF A DUAL-ENERGY MONOCHROMATIC XRAY CT ALGORITHM TO POLYCHROMATIC X-RAY CT: A FEASIBILITY STUDY

  • Chang, S.;Lee, H.K.;Cho, G.
    • Nuclear Engineering and Technology
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    • 제44권1호
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    • pp.61-70
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    • 2012
  • In this study, a simple post-reconstruction dual-energy computed tomography (CT) method is proposed. A dual-energy CT algorithm for monochromatic x-rays was adopted and applied to the dual-energy CT of polychromatic x-rays by assigning a representative mono-energy. The accuracy of algorithm implementation was tested with mathematical phantoms. To test the sensitivity of this algorithm to the inaccuracy of representative energy value in energy values, a simulation study was performed with mathematical phantom. To represent a polychromatic x-ray energy spectrum with a single-energy, mean energy and equivalent energy were used, and the results were compared. The feasibility of the proposed method was experimentally tested with two different micro-CTs and a test phantom made of polymethyl methacrylate (PMMA), water, and graphite. The dual-energy calculations were carried out with CT images of all possible energy pairs among 40, 50, 60, 70, and 80 kVp. The effective atomic number and the electron density values obtained from the proposed method were compared with theoretical values. The results showed that, except the errors in the effective atomic number of graphite, most of the errors were less than 10 % for both CT scanners, and for the combination of 60 kVp and 70 kVp, errors less than 6.0 % could be achieved with a Polaris 90 CT. The proposed method shows simplicity of calibration, demonstrating its practicality and feasibility for use with a general polychromatic CT.