• Title/Summary/Keyword: imaging material

Search Result 579, Processing Time 0.031 seconds

Ductal Carcinoma in situ with Multicystic Changes in a Patient with Interstitial Mammoplasty via Paraffin Injection: MRI and Pathological Findings

  • Park, Jiyoon;Woo, Ok Hee;Kim, Chungyeul;Cho, Kyu Ran;Seo, Bo Kyoung
    • Investigative Magnetic Resonance Imaging
    • /
    • v.19 no.2
    • /
    • pp.127-130
    • /
    • 2015
  • Direct injection of foreign material, such as liquid paraffin and silicone, into the breast can induce a foreign body granulomatous reaction and fibrosis, resulting in hard, nodular breast masses and architectural distortion that can mimic neoplasm. Conventional methods, including physical examination, mammography, and ultrasonography are of little use to differentiate between foreign body-induced mastopathy and breast cancer. In patients with foreign body injection such as breast augmentation, dynamic contrast enhanced MR imaging is an excellent imaging modality. Here, the authors report the MR imaging and pathological findings of ductal carcinoma in situ (DCIS) with multicystic changes in a 41-year-old woman with a previous history of interstitial mammoplasty by paraffin injection.

X-ray Micro-Imaging Technique and Its Application to Micro-Bubbles in an Opaque Tube (X-ray Micro-Imaging 기법 소개 및 불투명 튜브 내부의 마이크로 버블 가시화 연구)

  • Lee Sang-Joon;Kim Seok;Paik Bu-Geun
    • 한국가시화정보학회:학술대회논문집
    • /
    • 2002.11a
    • /
    • pp.31-34
    • /
    • 2002
  • Imaging techniques using x-ray beam at high energies (>6KeV) such as contact radiography, projection microscopy, and tomography have been used to nondestructively discern internal structure of objects in material science, biology, and medicine. This paper introduces the x-ray micro-imaging method using 1B2 micro-probe line of PAL (Pohang Accelerator Laboratory). Cross-sectional information on low electron density materials can be obtained by probing a sample with coherent synchrotron x-ray beam in an in-line holography setup. Living organism such as plants, insects are practically transparent to high energy x-rays and create phase shift images of x-ray wave front. X-ray micro-images of micro-bubbles of $20\~120\;{\mu}m$ diameter in an opaque tube were recorded. Clear phase contrast images were obtained at Interfaces between bubbles and surrounding liquid due to different decrements of refractive index.

  • PDF

Design and Experimental Demonstration of Coaxially Folded All-reflective Imaging System

  • Xiong, Yupeng;Dai, Yifan;Chen, Shanyong;Tie, Guipeng
    • Current Optics and Photonics
    • /
    • v.3 no.3
    • /
    • pp.227-235
    • /
    • 2019
  • With slimmer, lighter and all-reflective imaging systems in high demand for consumer and military applications, coaxially folded optical image systems are widely considered because they can extend focal length and reduce track length. Most of these systems consist of multiple surfaces, and these surfaces are machined on one element or grouping processing on two elements. In this paper, we report and first experimentally demonstrate an all-aluminum all-reflective optical system which consists of two optical elements, with two high order aspherical surfaces in each element. The coaxially folded system is designed with Seidel aberration theory and advanced optimization with Zemax. The system is made of all-aluminum material processing by single point diamond turning (SPDT). On this basis, we completed the system integration and performed an imaging experiment. The final system has the advantages of short track length and long focal length and broad application prospects in the micro-unmanned aerial vehicle field.

Feasibility study of Hybrid X-ray detecter for Digital X-ray imaging application (디지털 방사선 적용을 위한 Hybrid 방사선 검출기의 Feasibility 연구)

  • Choi, Jang-Yong;Park, Ji-Koon;Lee, Chae-Hun;Lee, Kyu-Hong;Choi, Heung-Kook;Nam, Sang-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2004.04b
    • /
    • pp.77-80
    • /
    • 2004
  • In this study, the purpose is to verified the feasibility to develope Hybrid x-ray detector in order to resolve problems of direct and indirect x-ray detectors. The properties of X-ray detector depend on absorption of X-ray, charge generation by x-ray photon, leakage current. In this study, CdS was used as photoconductor, and $Y_2O_2S:Tb$ as x-ray phosphor was formed on CdS in order to embody Hybrid structure. And Screen printing was used to form Muli-layer. Characteristics of this specimen were analyzed by using SEM, and XRD. And Photoluminescence spectrum of $Y_2O_2S:Tb$, leakage current, with respect to applied voltages, output charge with respect to applied voltages, and X-ray sensitivity were measured. Also, linearity with respect to dose was measured. Leakage current was similar with direct digital x-ray detector, but sensitivity of the hybrid structure is much better than the single-layer structure.

  • PDF

An Experimental Study on the Estimation of Sol-air Temperature and Absorptance in Building Exterior Materials by Using the Infrared Image (적외선 열화상을 이용한 건축외장재의 일사표면온도와 흡수율 추정에 관한 실험적 연구)

  • Park, Sa-Keun;Jang, Gil-Soo;Song, Min-Jeong;Shin, Hoon
    • KIEAE Journal
    • /
    • v.6 no.4
    • /
    • pp.33-39
    • /
    • 2006
  • This study aims to investigate the method to reduce the surface temperature caused by insolation. To achieve this goal, surface temperature of building is measured and the effects of exterior material's color and brilliance were checked with infrared imaging. And also, exterior material's absorptances due to outdoor surface heat transfer coefficients were measured. After surface temperature measurement of 37 specimen of 5 categories, the temperature is the highest on wood($53.62^{\circ}C$) and panel($52.05^{\circ}C$). Dryvit, stone, brick is the rating of order. For exterior material's absorptances, panel(0.883) and wood(0.868) were high and Dryvit, stone, brick follows wood and panel.

Transport property of a Se:As films for digital x ray imaging

  • Kim, Jae-Hyung;Nam, Sang-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2006.04a
    • /
    • pp.85-88
    • /
    • 2006
  • The transport properties of amorphous selenium typical of the material used in direct conversion x-ray imaging devices are reported. The effects of As addition on the carrier mobility and recombination lifetime in amorphous selenium (a-Se) films have been studied using the moving photocarrier grating (MPG) technique. We have found an increase in hole drift mobility and recombination lifetime, especially when 0.3% As is added into a-Se film, whereas electron mobility decreases with As addition due to the defect density. The transport properties for As doped a-Se films obtained by using MPG technique have been compared with the drift mobilities of holes and electrons obtained by time of flight (TOF) measurement.

  • PDF

Optical Monte Carlo Simulation on Spatial Resolution of Phosphor Coupled X-ray Imaging Detector (형광체 결합형 X선 영상검출기의 공간 해상력 몬테카를로 시뮬레이션)

  • Kang, Sang-Sik;Kim, So-Yeong;Shin, Jung-Wook;Heo, Sung-Wook;Kim, Jae-Hyung;Nam, Sang-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2007.06a
    • /
    • pp.328-328
    • /
    • 2007
  • Large area matrix-addressed image detectors are a recent technology for x-ray imaging with medical diagnostic and other applications. The imaging properties of x-ray pixel detectors depend on the quantum efficiency of x-rays, the generated signal of each x-ray photon and the distribution of the generated signal between pixels. In a phosphor coated detector the light signal is generated by electrons captured in the phosphor screen. In our study we simulated the lateral spread distributions for phosphor coupled detector by Monte Carlo simulations. Most simulations of such detectors simplify the setup by only taking the conversion layer into account neglecting behind. The Monte Carlo code MCNPX has been used to simulate the complete interaction and subsequent charge transport of x-ray radiation. This has allowed the analysis of charge sharing between pixel elements as an important limited factor of digital x-ray imaging system. The parameters are determined by lateral distribution of x-ray photons and x-ray induced electrons. The primary purpose of this study was to develop a design tool for the evaluation of geometry factor in the phosphor coupled optical imaging detector. In order to evaluate the spatial resolution for different phosphor material, phosphor geometry we have developed a simulation code. The developed code calculates the energy absorption and spatial distribution based on both the signal from the scintillating layer and the signal from direct detection of x-ray in the detector. We show that internal scattering contributes to the so-called spatial resolution drop of the image detector. Results from the simulation of spatial distribution in a phosphor pixel detector are presented. The spatial resolution can be increased by optimizing pixel size and phosphor thickness.

  • PDF

Clinical Application of MRI in an Animal Bone Graft Model

  • Liu, Xiaochen;Jia, Wenxiao;Jin, Gele;Wang, Hong;Ma, Jingxu;Wang, Yunling;Yang, Yi;Deng, Wei
    • Journal of Magnetics
    • /
    • v.18 no.2
    • /
    • pp.142-149
    • /
    • 2013
  • We aim to monitor vascularization of early bone perfusion following rabbit lumbar intertransverse bone graft fusion surgery using magnetic resonance imaging assessment. Correlation with graft survival status was evaluated by histological method. Experimental animals were randomly divided into three groups and the model was established by operating bilateral lumbar intertransverse bone graft with different types of bone graft substitute material. The lumbar intertransverse area of three groups of rabbits was scanned via MRI. In addition, histological examinations were performed at the $6^{th}$ week after surgery and the quantitative analysis of the osteogenesis in different grafted area was carried out by an image analysis system. The MRI technique can be used for early postoperative evaluation of vascularized bone graft perfusion after transplantation of different bone materials, whereas histological examination allows direct visualization of the osteogenesis process.

Preliminary Study of Performance Evaluation of a Dual-mode Compton Camera by Using Geant4 (Geant4 몬테칼로 전산모사 툴킷을 이용한 이중모드 컴프턴 카메라 최적화 설계 및 성능평가)

  • Park, Jin Hyung;Seo, Hee;Kim, Seoung Hoon;Kim, Young Soo;Kim, Chan Hyeong
    • Journal of Radiation Protection and Research
    • /
    • v.37 no.4
    • /
    • pp.191-196
    • /
    • 2012
  • A double-scattering type Compton camera which is appropriate to imaging a high-energy gamma source has been developed for nuclear material surveillance at Hanyang University. The double-scattering type Compton camera can provide high imaging resolution; however, it has disadvantage of relatively low imaging sensitivity than existing single-scattering type Compton camera. In this study, we introduce a novel concept of a dual-mode Compton camera which incorporates two different types of Compton camera, i.e., single- and double-scattering type. The dual-mode Compton camera can operate high-resolution mode and high-sensitivity mode in a single system. To maximize its performance, the geometrical configuration was optimized by using Geant4 Monte Carlo simulation toolkit. In terms of imaging sensitivity, high-sensitivity mode had higher sensitivity than high-resolution mode up to 100 times while high imaging resolution of the double-scattering Compton camera was maintained.

Three-dimensional integral imaging using an elastic PDMS lens array

  • Kim, Yun-Hee;Kim, Yeun-Tae;Jung, Jae-Hyun;Lee, Sin-Doo;Lee, Byoung-Ho
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2008.10a
    • /
    • pp.714-717
    • /
    • 2008
  • In this paper, we propose a three-dimensional (3D) integral imaging system using an elastic lens array instead of conventional rigid lens array. The lens array is made of polydimethylsiloxane (PDMS) that is optically transparent and flexible material. We can stretch the PDMS lens array to be expanded into a certain extent, and control the lens pitch of the system easily. That flexible design enables a fine 3D integral imaging display.

  • PDF