• Journal of radiological science and technology
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• v.44 no.6
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• pp.615-621
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• 2021

In the medical field, radiation provides information for the diagnosis and treatment of diseases. As the use of radiation increases and the risk of exposure increases, interest in radiation protection is also rapidly increasing. Lead shielding material is mainly used, which has a risk of lead poisoning and absorption into the body. Tungsten mixed filament shielding sheets were fabricated with a size of 70 × 70 mm and a thickness of 1, 2, and 4 mm by using a 3D printer. In the general shooting experiment, the thickness of the shielding sheet is 1 ~ 5mm, the tube voltage is 60, 80, 100, 120 kVp and the tube current is 20, 40 mAs. In general photography, Tungsten showed better shielding rate compared to Brass, Copper, and Lead protective tools under all irradiation conditions, and in particular, Tungsten 5 mm showed 100% shielding rate. The 3D-printed tungsten mixed filament shielding is expected to be used as a new shield that can replace the existing lead protection tools as it shows a better shielding rate than the existing lead protection tools in Radiography.

• Journal of radiological science and technology
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• v.29 no.1
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• pp.21-28
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• 2006

I made inquires about mammographic equipments and circumstances of mammography rooms in the 64 medical facilities in areas of Seoul and Kyong Gi Do. Moreover I had experments about exposure dose with patients and radiologic technologists. so there is the data indicated follows. 1. There are inclined to improve in quality and function of mammographic equipments, it has been proven that s/f system exchanged to DR system. 2. It is certain that the number of examinations are becoming increasingly significant. 3. The Space Scattered Dose of mammography rooms are much more larger than portable equipments. 4. I worry about the affection of expose dose about Space Scattered Dose of mammography room. 5. There is need of study how to cope with the situation about increasing exposure dose of radiologic technologists in small space and numeruous number of examinations.

• Journal of the Korean Society of Radiology
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• v.10 no.8
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• pp.619-627
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• 2016

The purpose of this study is to investigate the effect of CT contrast agent and MRI contrast agent on the area dose in the body when using automatic exposure control system in general radiography. After making rectangular holes in the center of the abdominal thickness paraffin phantom, CT contrast agent and MRI contrast agent were respectively diluted with physiological saline solution for contrast medium dilution ratio of 10:0, 9:1, 8:2, 7:3, 6:4, 5:5, 4:6, 3:7, 2:8, 1:9, 0:10%. Each experiment was set to 78 kVp, 320 mA, which is the proper condition for KUB photography, and thereafter a total of 30 inspections were made for each dilution ratio using an automatic exposure control device, and the area dose corresponding to the dilution ratio of each contrast agent, Average comparison and correlation analysis were performed on the exposure index. As a result, the CT contrast agent and the MRI contrast agent appeared different in area dose according to the dilution ratio(p<0.05), and as the dilution ratio increased, the area dose increased for CT contrast agent and MRI contrast agent(P<0.05). In each test, the exposure index showed the manufacturer's recommendation of 200-800 EI value, and the exposure index and area dose increased as the area dose increased(p<0.05). In conclusion, CT contrast agent and MRI contrast agent confirmed to increase the area dose by general imaging test using all automatic exposure control device. Therefore, it is considered that it is necessary to perform it after the contrast medium has been excreted sufficiently when using usual imaging test after using the contrast agent in CT and MRI examination.

• The Journal of the Korea Contents Association
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• v.17 no.6
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• pp.287-295
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• 2017

This study is aimed at observing effects of fingerprint image quality on various photographing conditions in the aspect of resolution. Discrimination between two friction ridges plays an important role in the value of fingerprint image, and it can be confirmed with quantification of pixels of boundary region which is existing between two friction ridges. In this study, several factors were estimated with same fingerprint image using Adobe photoshop CS 6 for analysis: changes of image quality by ISO, movement when photographing, and photographers' experience and skill. Consequently, there was no significant change of image quality by ISO. Furthermore, there was no significant difference in the hand-held images between crime scene investigators and laymen, yet there was significant difference between hand-held images and images using tripod in the aspect of resolution. This study shows that using tripod is very important in forensic fingerprint photography through empirical methods.

• Journal of Veterinary Clinics
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• v.30 no.5
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• pp.366-370
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• 2013

A 7-month-old Pomeranian presented with non-weight bearing lameness on the right pelvic limb. Physical examination revealed pain on extension of the right hip joint, and serum chemistry results showed an increased concentration of creatine kinase. Radiographic findings at admission included a weak radiolucent line on the right femoral head and widening of the right hip joint space, and mild displacement of the right capital femoral epiphysis was additionally identified on day 14. Computed tomography (CT) showed a decreased Hounsfield Unit measurement and a fracture line on the right femoral head. Early stage Legg-Calve-Perthes disease (LCPD) was diagnosed and femoral head and neck ostectomy was performed on the right femur. A fracture fissure and osteophytes at the epiphyseal plate of the femoral head were identified surgically. Necrosis in the femoral metaphysis and epiphysis was observed histologically. This case report describes the radiography, CT images, and surgical and histological findings in a dog with early stage LCPD.

• Journal of the Korean Society of Radiology
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• v.7 no.3
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• pp.233-238
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• 2013

Chest lateral decubitus radiation exposure PA be carried out in general, but emergency patient or the patient's discomfort in the body examination had a lot of inconvenience. In this study, we compared AP and PA image quality, patient safety, and analysis of the examination effectiveness between the two tests was to evaluate the usefulness. Pleurisy or pneumothorax in patients with suspected or diagnosed chest lateral decubitus radiation exposure 30 consecutive patients (male 20 patients, 10 females) were included in the study. Image quality evaluation method microstructure of lung, wide areas of diagnosis, a clear air-fluid interface, the patient rotate, cardiac shadow and sharp diaphragmatic was based on Department of Radiology specialist, division of pulmonology resident blind test was evaluated by four people. Chest decubitus by radiation exposure the AP and PA position examination the usefulness of comparative analysis Image quality in the AP and PA, whereas there was no significant difference in attitude, Stability of the patient and Radiation's examination efficiency AP position compared to the position of PA scores were higher. PA position does not require a examination may be of AP position in a position to suggest that.

• Journal of the Korea Convergence Society
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• v.8 no.1
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• pp.51-59
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• 2017

It is to establish preliminary data about healthcare convergencr of infection control by performing a bacterial contamination test for CT scanner as well as general radiographic systems in the emergency rooms of general hospitals. The period was December 1 ~ December 31, 2015. It is detect in the emergency rooms of 7 medical facilities including 2 in Seoul, and 1 in Gyeonggi-do Province, and 2 in Jeonla-do Province, and 2 in Chungcheong-do Province. The surface contamination strains detected from CT scanner in the radiology department emergency rooms were Micrococcus species(4,5%), Stenotrophomonas maltophilia(9%), Enterococcus faecium(4.5%), Providencia stuartii(4.5), and Gram negative bacilli(4.5%). Also, the surface contamination strains detected from general radiographic system in the radiology department emergency rooms were Providencia stuartii(11%), Klebsiella pneumonia(3.5%), Stenotrophomonas maltophilia(11%), Pantoea species(11%), Acinetobacter baumannii(3.5%), Micrococcus species(3.5%), Escherichia coli(3.5%), Enterobacter species(3.5%), and Gram negative bacilli(11%). Considering that the regions of most detection were all the places closely related to patients, radiologists would have to thoroughly clean with alcohol before and after a test.

• Journal of Digital Convergence
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• v.12 no.12
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• pp.371-379
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• 2014

In this study, we conducted a survey on the limited examinations of the DR system to the 30 radiologic technologists engaging in the clinical sites and university hospitals in Daejeon metropolitan city from Oct. 15, 2012 to Nov. 15, 2012. Based on the survey results, we propose the conceptual design of a supplementary table for the conventional DR system to extend the examination capability and overcome the limitation of DR system. And, we evaluated the convenience and usefulness of the proposed table by applying it to five subjects. Ten experts were involved to evaluate the clinical usefulness of the obtained images. In this study, the experimental results show the feasibility to overcome the limited examination of the conventional DR system, and the proposed supplementary table may be beneficial to patients and hospitals.

• Journal of the Korean Society of Radiology
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• v.9 no.2
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• pp.109-115
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• 2015

In case of a CT examinations, there is a difference in the distribution of radiation dose from that of general X-ray equipments, and it has been known to cause a great radiation exposure during the examinations. However, owing to its high reliability on the accuracy of a examinations result, its use has increased continuously. In consideration of such a circumstance, the CT equipment, radiation dose during CT examinations, diagnostic reference level, and solutions to reduce radiation dose were mentioned on the basis of previously reported data.

• Journal of Biomedical Engineering Research
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• v.22 no.2
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• pp.165-169
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• 2001

최근 포항 방사광 가속기 연구소에 미세구조 X-선 영상 실험을 위한 5C1 방사광(Synchrtoron Radiation) 빔라인이 건설되었다. 광대역의 에너지 스펙트럼을 가진 방사광 X-선이 물체를 투과한 후 CdWO$_{4}$ scintillator에 의해 가시광선으로 바뀌고, 그 빛을 CCD 카메라로 받아들여 영상을 획득하게 된다. 방사광 X-선은 일반 의료진단용 X-선에 비하여 위상이 일치하고, 평행하며, 그 양이 풍부한 특성들을 갖고 있다. 방사광 영상시스템과 X-선 유방촬영 시스템에서 영상을 획득하여 영상특성들을 비교, 분석하였다. 고-분해능 X-선 시험 패턴(20 line pairs mm$^{-1}$), 유방촬영 팬텀, 파라핀에 고정한 인체 유방암조직과 포르말린에 고정한 인체 유방암조직, 그리고 capillary tube내 micro-bubbles등의 방사광 영상은 기존의 X-선 유방촬영시스템에서 얻은 영상보다 분해능이 뛰어나고 영상질도 우수하였다. 방사광 X-선 영상시스템은 micrometer 공간 분해능 영상을 획득할 수 있어 많은 기초분야의 영상연구와 의료영상분야에서도 활발하게 활용될 것으로 기대된다.