• Title/Summary/Keyword: Device Portal

Search Result 100, Processing Time 0.036 seconds

Isocenter Check and QA of Tactic Radiosurgery Devices Using EPID (EPID를 이용한 정위적방사선수술의 중심점 검사에 대한 연구)

  • Shin, Kyo Chul;Choi, Sang Gyu;Kim, Jung Kee;Jeong, Dong Hyeok
    • Progress in Medical Physics
    • /
    • v.25 no.4
    • /
    • pp.281-287
    • /
    • 2014
  • The Winston Lutz test, which checks the accuracy of the isocenter for stereotactic radiosurgery (SRS), was performed with the commercial electronic portal imaging device (EPID). The usual Winston Lutz test with film was also performed for comparison with the test with EPID. The maximum difference in isocenter between the two methods was 0.32 mm. The Winston Lutz test using EPID is practical as it can reduce time and avoid human errors compared to the test with film.

System Development and Fundamental Study of CCD Camera Based Electronic Portal Imaging Device (CCD Camera 기반 실시간 방사선치료조사면 검증 시스템 개발 및 화질개선을 위한 기초연구)

  • Jang, Gi-Won;Park, Ji-Koon;Lee, Dong-Gil;Kim, Jin-Yeong;Nam, Sang-Hee;Ha, Sung-Whan
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2003.11a
    • /
    • pp.380-383
    • /
    • 2003
  • The purpose of this study is to develope prototype EPID system and improve image quality of radiation therapy field imaging system using CCD camera. For this research we used Linac(Clinac 4/100), Copper metal plate, $Gd_2O_2S_2$ phosphor and CCD camera(Photronic). In this study we find best thickness of buil-up metal plate and acquired projection image of humanoid head phantom. Also we enhanced raw image data using superposition and histogram stretching method. Through the thickness optimized of metal plate and image processing, we confirmed of an improved image quality of an EPID system using CCD camera. As result, highest quality image was acquired at 1mm thickness of Copper metal plate and improved image quality by image processing methods.

  • PDF

A Study on Applying Zero Trust Architecture: Focusing on Implementing Remote Work System (제로 트러스트 아키텍처 적용 방안에 대한 연구: 재택근무 시스템 구성을 중심으로)

  • Jaewoo Do;Keumseok Kang
    • Journal of the Korea Institute of Information Security & Cryptology
    • /
    • v.33 no.6
    • /
    • pp.1001-1020
    • /
    • 2023
  • As massive increase in remote work since COVID-19, the boundaries between the inside and outside of corporate networks have become blurred. As a result, traditional perimeter security has stagnated business productivity and made it difficult to manage risks such as information leakage. The zero trust architecture model has emerged, but it is difficult to apply to IT environments composed of various companies. Therefore, using the remote work system configuration as an example, we presented a configuration and methodology that can apply zero trust models even in various network environments such as on-premise, cloud, and network separation. Through this, we aim to contribute to the creation of a safe and convenient cyber environment by providing guidance to companies that want to apply zero trust architecture, an intelligent system that actively responds to cyber threats.

A Study on the Prority Channel Acquisition of Purchase Information in E-Commerce in South Korea

  • Dong Bin JEONG
    • East Asian Journal of Business Economics (EAJBE)
    • /
    • v.12 no.3
    • /
    • pp.25-35
    • /
    • 2024
  • Purpose: The purpose of this paper is to investigate the consumption behavior of consumers more closely and efficient purchasing channels of domestic e-commerce buyers by specifically analyzing the relationship between demographics and channels that are used first to acquire purchasing information during e-commerce. Research design, data and methodology: Korean Media Panel Survey performs 17 cities and provinces nationwide, and 4,537 panel households (all household members aged 6 or older) are surveyed, and a household visit interview is conducted. Correspondence analysis, one of the popular multivariate techniques, is exploited to explore the association between priority channel for acquisition of information and demographics. Results: The findings show that the considered demographics are closely associated with the priority channel for acquisition of purchase information. In particular, 'searching for portal sites' are closely relevant to 'more than 5 million won', 'device & machine control assembly', 'graduate school or higher', and '40-59', while 'searching for online open market' is linked with college graduate and '20-39'. Conclusions: The substantial contribution of this work is that by analyzing the association between demographics and priority channel for acquisition of purchase information in e-commerce in South Korea, we can discern the segmentation standard factor for e-commerce market and advance the subdivided market.

Evaluation of Image Quality for Various Electronic Portal Imaging Devices in Radiation Therapy (방사선치료의 다양한 EPID 영상 질평가)

  • Son, Soon-Yong;Choi, Kwan-Woo;Kim, Jung-Min;Jeong, Hoi-Woun;Kwon, Kyung-Tae;Cho, Jeong-Hee;Lee, Jea-Hee;Jung, Jae-Yong;Kim, Ki-Won;Lee, Young-Ah;Son, Jin-Hyun;Min, Jung-Whan
    • Journal of radiological science and technology
    • /
    • v.38 no.4
    • /
    • pp.451-461
    • /
    • 2015
  • In megavoltage (MV) radiotherapy, delivering the dose to the target volume is important while protecting the surrounding normal tissue. The purpose of this study was to evaluate the modulation transfer function (MTF), the noise power spectrum (NPS), and the detective quantum efficiency (DQE) using an edge block in megavoltage X-ray imaging (MVI). We used an edge block, which consists of tungsten with dimensions of 19 (thickness) ${\times}$ 10 (length) ${\times}$ 1 (width) $cm^3$ and measured the pre-sampling MTF at 6 MV energy. Various radiation therapy (RT) devices such as TrueBeam$^{TM}$ (Varian), BEAMVIEW$^{PLUS}$ (Siemens), iViewGT (Elekta) and Clinac$^{(R)}$iX (Varian) were used. As for MTF results, TrueBeam$^{TM}$(Varian) flattening filter free(FFF) showed the highest values of $0.46mm^{-1}$ and $1.40mm^{-1}$ for MTF 0.5 and 0.1. In NPS, iViewGT (Elekta) showed the lowest noise distribution. In DQE, iViewGT (Elekta) showed the best efficiency at a peak DQE and $1mm^{-1}DQE$ of 0.0026 and 0.00014, respectively. This study could be used not only for traditional QA imaging but also for quantitative MTF, NPS, and DQE measurement for development of an electronic portal imaging device (EPID).

Comparison of Noise Power Spectrum Methodologies in Measurements by Using Various Electronic Portal Imaging Devices in Radiation Therapy (방사선치료시 전자포털영상장치를 이용한 잡음전력스펙트럼 방법론 측정비교)

  • Son, Soon-Yong;Choi, Kwan-Woo;Jeong, Hoi-Woun;Kwon, Kyung-Tae;Kim, Ki-Won;Lee, Young-Ah;Son, Jin-Hyun;Min, Jung-Whan
    • Journal of radiological science and technology
    • /
    • v.39 no.1
    • /
    • pp.99-105
    • /
    • 2016
  • The noise power spectrum (NPS) is one of the most general methods for measuring the noise amplitude and the quality of an image acquired from a uniform radiation field. The purpose of this study was to compare different NPS methodologies by using megavoltage X-ray energies. The NPS evaluation methods in diagnostic radiation were applied to therapy using the International Electro-technical Commission standard (IEC 62220-1). Various radiation therapy (RT) devices such as TrueBeam$^{TM}$(Varian), BEAMVIEW$^{PLUS}$(Siemens), iViewGT(Elekta) and Clinac$^R$ iX (Varian) were used. In order to measure the region of interest (ROI) of the NPS, we used the following four factors: the overlapping impact, the non-overlapping impact, the flatness and penumbra. As for NPS results, iViewGT(Elekta) had the higher amplitude of noise, compared to BEAMVIEW$^{PLUS}$ (Siemens), TrueBeam$^{TM}$(Varian) flattening filter, Clinac$^{R}$iXaS1000(Varian) and TrueBeam$^{TM}$(Varian) flattening filter free. The present study revealed that various factors could be employed to produce megavoltage imaging (MVI) of the NPS and as a baseline standard for NPS methodologies control in MVI.

A Comparative Study on the Perception of Actual Utilization of Smart Devices and Development of Culinary Education Application - Focused on 4-year University Students Located in the Daejeon.Chungnam Areas - (스마트 기기 활용 실태와 조리실습교육 애플리케이션 개발에 대한 인식 비교 연구 - 대전.충남지역 4년제 대학생을 중심으로 -)

  • Kang, Keoung-Shim
    • Culinary science and hospitality research
    • /
    • v.19 no.2
    • /
    • pp.176-189
    • /
    • 2013
  • This study has been conducted on 213 students in 4-year universities located in the regions of Daejeon and Chungnam in order to investigate a method to develop a smart device based culinary education application and the results and development method were as follows. First, the most often used smart device was a smart phone, which is used for over 5 hours a day and mainly used for SNS. Second, they utilized a smart device for language and major study during their spare time, wanted educational contents most and thought them useful for learning. Third, most of the students were positively aware of the necessity and learning effects of culinary education applications, and the response rate to utilize the application once a week was highest. Also, they hoped various recipes and simple cuisine and craftsman cooking. Therefore, the functions of SNS mostly often used by students should be added to promote interaction between teachers and students. And more contents should be made for students to use easily in moving or in their spare time. Furthermore, various videos of teaching and theoretical information should be included. And the applications focused on recipes and simple and craftsman cooking should be developed and uploaded on a school homepage and on popular portal sites so that students can easily utilize them.

  • PDF

Effectiveness Assessment on Jaw-Tracking in Intensity Modulated Radiation Therapy and Volumetric Modulated Arc Therapy for Esophageal Cancer (식도암 세기조절방사선치료와 용적세기조절회전치료에 대한 Jaw-Tracking의 유용성 평가)

  • Oh, Hyeon Taek;Yoo, Soon Mi;Jeon, Soo Dong;Kim, Min Su;Song, Heung Kwon;Yoon, In Ha;Back, Geum Mun
    • The Journal of Korean Society for Radiation Therapy
    • /
    • v.31 no.1
    • /
    • pp.33-41
    • /
    • 2019
  • Purpose : To evaluate the effectiveness of Jaw-tracking(JT) technique in Intensity-modulated radiation therapy(IMRT) and Volumetric-modulated arc therapy(VMAT) for radiation therapy of esophageal cancer by analyzing volume dose of perimetrical normal organs along with the low-dose volume regions. Materials and Method: A total of 27 patients were selected who received radiation therapy for esophageal cancer with using $VitalBeam^{TM}$(Varian Medical System, U.S.A) in our hospital. Using Eclipse system(Ver. 13.6 Varian, U.S.A), radiation treatment planning was set up with Jaw-tracking technique(JT) and Non-Jaw-tracking technique(NJT), and was conducted for the patients with T-shaped Planning target volume(PTV), including Supraclavicular lymph nodes(SCL). PTV was classified into whether celiac area was included or not to identify the influence on the radiation field. To compare the treatment plans, Organ at risk(OAR) was defined to bilateral lung, heart, and spinal cord and evaluated for Conformity index(CI) and Homogeneity index(HI). Portal dosimetry was performed to verify a clinical application using Electronic portal imaging device(EPID) and Gamma analysis was performed with establishing thresholds of radiation field as a parameter, with various range of 0 %, 5 %, and 10 %. Results: All treatment plans were established on gamma pass rates of 95 % with 3 mm/3 % criteria. For a threshold of 10 %, both JT and NJT passed with rate of more than 95 % and both gamma passing rate decreased more than 1 % in IMRT as the low dose threshold decreased to 5 % and 0 %. For the case of JT in IMRT on PTV without celiac area, $V_5$ and $V_{10}$ of both lung showed a decrease by respectively 8.5 % and 5.3 % in average and up to 14.7 %. A $D_{mean}$ decreased by $72.3{\pm}51cGy$, while there was an increase in radiation dose reduction in PTV including celiac area. A $D_{mean}$ of heart decreased by $68.9{\pm}38.5cGy$ and that of spinal cord decreased by $39.7{\pm}30cGy$. For the case of JT in VMAT, $V_5$ decreased by 2.5 % in average in lungs, and also a little amount in heart and spinal cord. Radiation dose reduction of JT showed an increase when PTV includes celiac area in VMAT. Conclusion: In the radiation treatment planning for esophageal cancer, IMRT showed a significant decrease in $V_5$, and $V_{10}$ of both lungs when applying JT, and dose reduction was greater when the irradiated area in low-dose field is larger. Therefore, IMRT is more advantageous in applying JT than VMAT for radiation therapy of esophageal cancer and can protect the normal organs from MLC leakage and transmitted doses in low-dose field.

Clinical implementation of PerFRACTIONTM for pre-treatment patient-specific quality assurance

  • Sang-Won Kang;Boram Lee;Changhoon Song;Keun-Yong Eeom;Bum-Sup Jang;In Ah Kim;Jae-Sung Kim;Jin-Beom Chung;Seonghee Kang;Woong Cho;Dong-Suk Shin;Jin-Young Kim;Minsoo Chun
    • Journal of the Korean Physical Society
    • /
    • v.80
    • /
    • pp.516-525
    • /
    • 2022
  • This study is to assess the clinical use of commercial PerFRACTIONTM for patient-specific quality assurance of volumetric-modulated arc therapy. Forty-six pretreatment verification plans for patients treated using a TrueBeam STx linear accelerator for lesions in various treatment sites such as brain, head and neck (H&N), prostate, and lung were included in this study. All pretreatment verification plans were generated using the Eclipse treatment planning system (TPS). Dose distributions obtained from electronic portal imaging device (EPID), ArcCHECKTM, and two-dimensional (2D)/three-dimensional (3D) PerFRACTIONTM were then compared with the dose distribution calculated from the Eclipse TPS. In addition, the correlation between the plan complexity (the modulation complexity score and the leaf travel modulation complexity score) and the gamma passing rates (GPRs) of each quality assurance (QA) system was evaluated by calculating Spearman's rank correlation coefficient (rs) with the corresponding p-values. The gamma passing rates of 46 patients analyzed with the 2D/3D PerFRACTIONTM using the 2%/2 mm and 3%/3 mm criteria showed almost similar trends to those analyzed with the Portal dose imaging prediction (PDIP) and ArcCHECKTM except for those analyzed with ArcCHECKTM using the 2%/2 mm criterion. Most of weak or moderate correlations between GPRs and plan complexity were observed for all QA systems. The trend of mean rs between GPRs using PDIP and 2D/3D PerFRACTIONTM for both criteria and plan complexity indices as in the GPRs analysis was significantly similar for brain, prostate, and lung cases with lower complexity compared to H&N case. Furthermore, the trend of mean rs for 2D/3D PerFRACTIONTM for H&N case with high complexity was similar to that of ArcCHECKTM and slightly lower correlation was observed than that of PDIP. This work showed that the performance of 2D/3D PerFRACTIONTM for pretreatment patient-specific QA was almost comparable to that of PDIP, although there was small difference from ArcCHECKTM for some cases. Thus, we found that the PerFRACTIONTM is a suitable QA system for pretreatment patient-specific QA in a variety of treatment sites.

The effect of portal compression sensor on the quality of chest compressions during cardiopulmonary resuscitation (CPR): A mannequin based simulation study (심페소생술 시행 시에 휴대용 압박 센서 활용이 흉부압박의 질에 미치는 영향: 마네킹 기반 시뮬레이션 연구)

  • Yang, Hyun-Mo;Baeck, Kyung-Min;Kim, Kwang-Suk;Yoon, Byung-Gil;Kim, Jin-Woo;Kim, Hoon
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.14 no.2
    • /
    • pp.744-750
    • /
    • 2013
  • This study is to collect a basic data of how Cardiopulmonary Resuscitation (CPR) procedure can influence to cardiac arrest patient with and without the Depth Device during the average transport time period. The data has achieved by comparing result sheet of CPR procedure by hands only versus with Depth Device by twenty 1st and 2nd class Emergency Medical Technician (EMT) from five different fire stations in city of Chong-Ju, and twenty Emergency Rescue major students who completed the BLS provide course. The experiment participators experienced loss of compression depth and rate increase over time. However, the CPR procedure with Depth Device shows that both EMT and students to allow maintaining both the compression depth and rate. The experiment leaves a positive result for CPR operators and considers being valuable domain for cardiac arrest patient.