• Korean Journal of Radiology
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• v.21 no.5
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• pp.620-622
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• 2020

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.76-77
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• 2003

Digital Radiograpy ＆ Fluoroscopy(DRF 또는 DR 또는 DF)는 cone beam을 이용하여 인체를 투과한 X선을 영상증배관(Image Intensifying Tube： IIT)을 통하여 가시광선으로 변환시킨 후 영상을 카메라로 보내고, 이곳에서 발생한 영상정보를 디지털로 처리하여 모니터를 통해 눈에 보이는 영상으로 만드는 방법으로 IIT에 기초한 디지털 방사선 촬영술이라고도 한다. DF 방법은 즉시 영상 표시와 진단이 가능하기 때문에 즉시성이 요구되는 심장이나 두복부 등의 순환기 분야에서 DSA(Digital Subtraction Angiography) 장비로 이용되고 있고, 순환기뿐만 아니라 위를 중심으로 한 소화관(식도, 위, 소장, 대장, 직장)의 분야에서 적용 가능하다. (중략)

• Journal of the Korean Society of Radiology
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• v.14 no.2
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• pp.139-148
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• 2020

The purpose of this study is to propose a method to optimize the performance of Digital Radiography (DR) by analyzing the effect of exposure time change on the stability of radiation output and image quality. The experimental method was used to change the exposure time to 50 msec, 100 msec, 200 msec, and 400 msec so that the Percentage Average Error (PAE), Time-to-Radiation Dose Curve, Signal to Noise Ratio (SNR), Contrast to Noise Ratio (CNR) and theses analysis were performed to evaluate the normal operation of parameters, radiation output and image quality. As a result, all the parameters used in the experiment showed the Percentage Average Error in the normal range, and the shorter the exposure time, the stability of radiation output and image quality decrease. In conclusion, it was found that the performance of Digital Radiography can be optimized when stable radiation output and image quality are applied by applying 100 msec ~ 200 msec exposure time.

• Journal of Advanced Navigation Technology
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• v.14 no.6
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• pp.791-799
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• 2010

In this paper, integrated navigation algorithm is designed for land transport sector which is needed high accuracy and monitoring program is developed for lane departure warning. High accuracy position information which is possible lane separation is needed for lane departure warning, so position detection algorithm based GPS/DR which combine GPS with dead reckoning is proposed. For the verification of the designed integrated navigation algorithm, we drived to acquire data and showed post-processing experiment results with monitoring program. Vehicle driving movie and aerial photograph in monitoring program is designed to show lane keeping and lane separation.

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.12
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• pp.120-127
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• 2016

In order to acquire digital x-ray images, developing radiography detectors have been recently conducted based on the DR (digital radiography) technology. The noise property of the radiography detector can be observed from measuring the NNPS (normalized noise power spectrum) using uniform exposure images. Here, the image difference of two images is used to remove the fixed pattern noise in measuring the detector NNPS. In this paper, two average images are first calculated using several images and then their difference is used to calculate an NNPS value. Here, the obtained NNPS value is usually lower than the true detector NNPS due to the average. Hence, a compensation constant, which is a function of the number of used images, is also proposed to compensate the NNPS value to obtain the true detector NNPS. Furthermore, another measurement method, in which the ratio of the average images is used, is proposed. Through NNPS measuring experiments using real x-ray images, it is observed that the proposed method can provide further accurate NNPS measurements.

• Proceedings of the Korea Contents Association Conference
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• 2014.11a
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• pp.195-196
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• 2014

현재 디지털방사선 환경으로 변화하고 있는 추세에 과거 필름-스크린 방식에서 사용되던 흉부 후 전 방향 검사 시 초점 영상 수신부 간의 거리가 디지털방식의 장비에도 여전히 적용되고 있다. 이에 본 연구에서는 3개의 DR장비에서 각 영상수용체의 제조특성을 고려하였을 때 실제 심장 및 심흉비의 확대정도에 대해 알아보고, 임상에서 DR 장비를 이용한 Chest PA 검사 시 심장 및 심흉비의 확대도에 대한 정보를 제공하고자 한다.

• Korean Journal of Radiology
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• v.25 no.2
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• pp.210-211
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• 2024

• Korean Journal of Radiology
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• v.23 no.4
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• pp.491-491
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• 2022

• Journal of the Korean Society of Radiology
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• v.8 no.7
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• pp.417-422
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• 2014

In this study, the influence degree of the scattering of the line depending on the incident energy of the radiation objective was to evaluate a new method of quantitative methods of PSNR is provided.Value of MSE and PSNR of the DR and the Target is placed at the left when there was no change in CR Target, the change appeared to ttaran MSE and PSNR value in tube voltage. Both CR and DR seen that there is a variation of the MSE and PSNR depending on the tube voltage change Computon showed that the scattered radiation effects. If the CR and DR 80 The changes in the MSE and PSNR experience the symptoms suddenly occur in areas kVp was found to affect the optoelectronic Computon E, and at the same time, the scattered radiation detector Computon Computon by scattering due to the photoelectric effect. CR and DR of the imaging device in the future on the basis of the energy bands of the photoelectric effect of 60 kVp 70 kVp, 80 kVp, 90 kVp, compares the value of the PSNR and MSE 100 kVp in accordance with the change of the tube voltage of the CR and device DR proposes jigil scattering study of the degradation of the line quality is achieved.

• Korean Journal of Digital Imaging in Medicine
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• v.12 no.2
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• pp.81-87
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• 2010

The setting parameters of ultrasound scanner give influences to change of image. Sonographers have used a Matlab program to make Low Contrast Sensitivity(LCS) value and compared original images in order to evaluate the use of the supersonic diagnosis machinery. We confirmed the change of image in Grayscale values using Photoshop program. Experiment equipment of our research used A Medison Accuvix V10, A Multi-Tissue Ultrasound Phantom(040 GSE) of CHRIS Company, A Adobe Photoshop CS4 Program, A Convex Probe, A USB memory stick, A Probe Fixation Equipment. The method used Gain, Dynamic Range(DR) of the setting parameters of ultrasound scanner and researched Gain and DR was set to 10 dB. We changed the different settings to see the changes of images using Grayscale values of a Photoshop program about tissue images of a phantom. This study evaluated DR and Gain whether it is an image controller to get the optimum contrast to produce an image to see the how effect on the images. We did not use Gateway in supersonic diagnosis machinery. We can easily open to open the files through Photoshop program before we get Digital Imaging and Communications in Medicine(DICOM) files use USB memory stick in supersonic diagnosis machinery. When we diagnosed the lesion of the patient with ultrasound, the contrast and the Gray scale value of image are very important. In this research, we determined the optimum setting parameters that provided useful information to diagnose disease and evaluated the change of improved images.