• Title/Summary/Keyword: radiography

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A study on anxiety about dental radiography among adults (성인의 치과 방사선 촬영에 대한 불안감에 관한 연구)

  • Lee, Kyeong-Hee;Kim, Eun-A;Baek, Ji-Hyeon;Heo, Su-Yeon;Jung, Eun-Seo
    • Journal of Korean society of Dental Hygiene
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    • v.17 no.5
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    • pp.721-733
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    • 2017
  • Objectives: This study was conducted to help reduce the anxiety about dental radiation exposures of people and to provide a way to instill proper awareness of dental radiation. Methods: To fulfill the research aim, this study conducted a survey to 330 subjects who are 20 years old or over living in Seoul and Gyeonggi-do during the month of December 2016. The collected data were analyzed using frequency analysis, t-test, one-way ANOVA, Pearson's correlation coefficient and multiple regression analysis among others. Results: As a result of examining the correlation between the anxiety of dental radiography and the correlations between the variables showed that the knowledge of radiation knowledge and the need for radiography (r=0.186, p<0.01), thinking about shooting (r=0.137, p<0.05), and the effectiveness of wearing protective equipment (r=0.120, p<0.01), showing statistically significant differences. As a result of examining the factors influencing anxiety of dental radiography among adults, high awareness of the need for dental radiography (p<0.01), the more the idea of dental anxiety in dental radiography is radiography showed higher (p<0.01). Conclusions: It seems proper that adequate dental radiography requires adequate explanation about it to patients, wearing of protective equipment, and appropriate dental radiation safety education.

Analysis of dental radiography phantom practice of dental hygiene students (치위생과 학생의 치과방사선 팬텀활용 촬영실습 분석)

  • Won, Bok-Yeon;Hwang, Mi-Yeong;Jang, Gye-Won;Heo, Nam-Suk;Yun, Mi-Suk;Park, Sung-Suk
    • Journal of Korean society of Dental Hygiene
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    • v.18 no.6
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    • pp.1013-1023
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    • 2018
  • Objectives: The purpose of this study is to evaluate dental hygiene students' recognition of safety management and phantom practice in dental radiology. Methods: The study subjects were 409 students in six regions who completed a dental radiology practice course and had on-job experience more than once. After understanding the study purpose and contents, they answered a questionnaire. The main jobs in dental radiology were analyzed. Results: As a result, regarding the most difficult aspects of dental radiology practice, "it is impossible to irradiate the mouth directly with X-rays" was the most common response (29.1%). Regarding the question "what is the main role of students in dental radiology practice?", the answer "it is shooting simulations using phantoms" accounted for 59.7% of responses. The most difficult regions in bisecting and paralleling radiography with a phantom were found to be the maxillary & mandibular molars and premolars. The most difficult technique was reported to be locating XCP maintenance to fit inside the mouth for both molars and premolars. The most difficult region to perform bitewing radiography using the phantom was the molar region (2.87), and the most difficult to perform occlusal radiography approaches were maxillary anterior general occlusal radiography (2.92) and mandibular cross-sectional occlusal radiography (3.00). Conclusions: The most technically difficult point in bitewing and occlusal radiography was the correct positioning of the vertical and horizontal angles. Radiography practice was considered to be more effective than previous mutual practice in terms of analysis of anatomical structures and patient treatment methods. Therefore, it will be necessary to improve policy regarding dental radiography practice at the department of dental hygienics and revise the necessary laws and regulations.

Direct digital radiography versus conventional radiography for estimation of canal length in curved canals

  • Mohtavipour, Seiedeh Tahereh;Dalili, Zahra;Azar, Nasim Gheshlaghi
    • Imaging Science in Dentistry
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    • v.41 no.1
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    • pp.7-10
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    • 2011
  • Purpose : The purpose of this study was to compare the conventional and digital radiography in the estimation of working length in mandibular molars. Materials and Methods : Sixty molar teeth were selected and divided into three groups in the basis of canal curves (0-$15^{\circ}$, 15-$30^{\circ}$, > $30^{\circ}$). After the placement of a 15 K-file, radiographs were taken with a conventional film (Fspeed) and a digital sensor. Canal lengths were measured in these images by two observers. Statistical analysis was performed with repeated measures of ANOVA and paired sample t-test with 95% confidence. Results : There was a high inter-observer agreement on the measurements of working length in conventional and digital radiographs. There was no significant difference between the mean values of measurements in conventional and digital radiography. Moreover, there was no significant difference between conventional and digital radiography with the actual values in the basis of canal curves. Conclusion : The accuracy of conventional and digital radiography in the determination of the working length was in an acceptable range.

A Study on the Scattered Dose in Portable Chest Radiography (portable 흉부촬영시 공간산란선량에 관한 연구)

  • Ahn, Bong-Seon;Lee, Hwan-Hyung
    • Journal of radiological science and technology
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    • v.23 no.2
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    • pp.63-67
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    • 2000
  • The purpose of this study is to survey the present status of portable radiography and the result of free space scattered dose rate when taking a radiography at the general hospital or the university hospital in Taejon city. The results were as follows; 1. The number of cases using portable radiography for three years increased to averages 16.2%, 7.7% per year from January 1st in 1996 to December 31st in 1998. 2. The average of distance of adjacent patients was 219.1 cm at the ward. 3. For portable chest radiography, the free space scattered dose rate was 10.5 mSv/hr at 50 cm distance, 1.8 mSv/hr at 100 cm distance, and 0.2 mSv/hr at 200 cm distance. Therefore, in case of portable chest radiography at the ward, the average of distance of adjacent patients is 219.1 cm, so it does not have influence on the adjacent patients. But during the portable radiography, a guardian who is close to the patient, doctor, nurse and radiologic technologists has to set up the shield to prevent from the unnecessary radiation or the distance should be as great as possible from the mobile X-ray equipment.

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Impact of dental radiography awareness on radiation exposure and concern among adults (성인의 구강 방사선 촬영에 대한 인식이 치과방사선 필요 이상 노출 및 걱정에 미치는 영향)

  • Lee, Kyeong-Hee;Byun, Ah-Ream;Kim, Soo-Kyung
    • Journal of Korean society of Dental Hygiene
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    • v.14 no.4
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    • pp.527-537
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    • 2014
  • Objectives : The purpose of this study was to investigate the influence of the awareness towards dental radiation exposure and concern in the adults. Methods : A self-reported questionnaires was filled out by 470 adults over 19 years old in Seoul from May 16 to July 10, 2013. Results : Fear for dental radiography showed that those who positively thought of radiography had 2.86 folds necessity of radiography than those who did not. Positive responders worried about the hazards of dental radiation 4.64 folds than the negative responders. More worried responders had felt the radiation hazards 1.83 folds than those who worried less. The worried responders also had higher awareness of dental radiation hazards. Conclusions : Frequent use of dental radiography is able to be prevented by protective devices. So it is important to prevent the possible hazards of the dental radiography by personal protective education.

A Study of Usefulness of Panoramic Radiography in Case of Employees' Oral Examination (근로자 구강검진 시 파노라마방사선사진의 필요성에 관한 고찰)

  • Jun, Sung-Hee
    • Korean Journal of Digital Imaging in Medicine
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    • v.13 no.2
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    • pp.91-97
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    • 2011
  • This study was conducted to know usefulness of panoramic radiography by comparing clinical evaluation and dental panoramic radiography in case of oral examination. Following results were concluded by analyzing difference between the result of Clinical evaluation and dental panoramic radiography. According to comparison the result of clinical evaluation and panoramic radiography, In Shin's research, dental caries was higher by 23.1%, periodontal disease was 31.9%, in An's research, dental caries was 24.2%. From new point of view from panoramic radiography, impacted tooth was 33.6%, Sinus abnormalities was 11.6%, periapical lesion was 5.4% in Shin's research and periapical lesion was 17.4%, 3rd molar impaction was 15.3% and retained root was 5.3% in An's research. Any kind of caries were not found in oral examination in the 66.7% of patients among patients with dental root caries in An's research. There were misdiagnose in oral examination(even side(59.5%),proximal side(59.5%), seconds caries(44.0%).

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EQUIVALENT DOSE, EFFECTIVE DOSE AND RISK ASSESSMENT FROM CEPHALOMETRIC RADIOGRAPHY TO CRITICAL ORGANS (두부규격방사선사진 촬영시 주요 장기의 등가선량, 유효선량 및 위험도)

  • Kang Seong-Sook;Cho Bong-Hae;Kim Hyun-Ja
    • Journal of Korean Academy of Oral and Maxillofacial Radiology
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    • v.25 no.2
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    • pp.309-318
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    • 1995
  • In head and neck region, the critical organ and tissue doses were determined, and the risks were estimated from lateral, posteroanterial and basilar cephalometric radiography. For each cephalometric radiography, 31 TLDs were placed in selected sites(18 internal and 13 external sites) in a tissue-equivalent phantom and exposed, then read-out in the TLD reader. The results were as follows: 1. From lateral cephalometric radiography, the highest effective dose recorded was that delivered to the salivary gland(3.6pSv) and the next highest dose was that received by the bone marrow(3pSv). 2. From posteroanterial cephalometric radiography, the highest effective dose recorded was that delivered to the salivary gland(2pSv) and the next highest dose was that received by the bone marrow(1.8pSv). 3. From basilar cephalometric radiography, the highest effective dose recorded was that delivered to the thyroid gland(31A p Sv) and the next highest dose was that received by the salivary gland(13.3 p Sv). 4. The probabilities of stochastic effect from lateral, posteroanterial and basilar cephalometric radiography were $0.72{\times}10^{-6}$, $0.49{\times}10^{-6}$ and $3.51{\times}10^{-6}$, respectively

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Characterization of a Neutron Beam Following Reconfiguration of the Neutron Radiography Reactor (NRAD) Core and Addition of New Fuel Elements

  • Craft, Aaron E.;Hilton, Bruce A.;Papaioannou, Glen C.
    • Nuclear Engineering and Technology
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    • v.48 no.1
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    • pp.200-210
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    • 2016
  • The neutron radiography reactor (NRAD) is a 250 kW Mark-II Training, Research, Isotopes, General Atomics (TRIGA) reactor at Idaho National Laboratory, Idaho Falls, ID, USA. The East Radiography Station (ERS) is one of two neutron beams at the NRAD used for neutron radiography, which sits beneath a large hot cell and is primarily used for neutron radiography of highly radioactive objects. Additional fuel elements were added to the NRAD core in 2013 to increase the excess reactivity of the reactor, and may have changed some characteristics of the neutron beamline. This report discusses characterization of the neutron beamline following the addition of fuel to the NRAD. This work includes determination of the facility category according to the American Society for Testing and Materials (ASTM) standards, and also uses an array of gold foils to determine the neutron beam flux and evaluate the neutron beam profile. The NRAD ERS neutron beam is a Category I neutron radiography facility, the highest possible quality level according to the ASTM. Gold foil activation experiments show that the average neutron flux with length-to-diameter ratio (L/D) = 125 is $5.96{\times}10^6n/cm^2/s$ with a $2{\sigma}$ standard error of $2.90{\times}10^5n/cm^2/s$. The neutron beam profile can be considered flat for qualitative neutron radiographic evaluation purposes. However, the neutron beam profile should be taken into account for quantitative evaluation.

A Quality Assurance on Digital Chest Radiography in Medical Institution for Pneumoconiosis : Compared with Analog Radiography (진폐요양기관의 흉부 디지털촬영과 아날로그촬영의 정도관리 비교)

  • Lee, Won-Jeong;Ko, Kyung-Sun;Park, Jai-Soung;Kim, Sung-Jin;Chu, Sang-Deok;Park, So-Young;Choi, Byung-Soon
    • Journal of radiological science and technology
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    • v.33 no.2
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    • pp.85-91
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    • 2010
  • Digital radiography has been replacing rapidly the analog radiography for diagnosis of pneumoconiosis. The purpose of this study is to compare quality control of digital radiography (DR) and analog radiography (AR) for chest radiography in medical institution for pneumoconiosis (MIP) For the first time, we visited MIP to evaluate the chest radiography which is used for patients with pneumoconiosis, including equipment, technical parameters and reading environment. There were 33 institutions. DR and AR were installed in 24 and 9 institutions, respectively. Between DR and AR, we compared the radiological technique (RT), image quality (IQ) and reading environment (RE) to use the guideline published by Occupational Safety and Health Research Institute (OSHRI). The image quality was rated by two experienced chest radiologists for pneumoconiosis with certified from OSHRI. The chest radiography equipment was not significantly difference between AR and DR, but there were significantly difference in tube voltage and grid ratio used for chest radiography except to tube current, exposure time. Statistically, DR is significantly higher in RT(70.3 vs. 43.8, p = 0.009), RE(77.7 vs. 33.3, p = 0.004) than AR, but it's not significantly difference in IQ (65.6 vs. 52.8, p = 0.050). AR and DR in RT were passed 33.3%, 75.0% respectively (p = 0.044) and 44.4%, 79.2% (p = 0.090) in IQ and 44.4%, 91.7% (p = 0.009) in RE. In MIP, DR needs to replace AR in diagnosis of pneumoconiosis.

Plain Abdominal Radiography in Infants and Children (영유아 및 소아의 단순복부 X-선 사진)

  • Lee, Hee-Jung
    • Pediatric Gastroenterology, Hepatology & Nutrition
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    • v.14 no.2
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    • pp.130-136
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    • 2011
  • Plain X-ray radiographs are the first line of investigation taken in the diagnosis of abdominal pathology and are considered an important diagnostic tool to provide guidelines for further imaging studies and comprehensive therapeutic management. Although most abdominal pathology demonstrates non-specific radiologic findings, the plain abdominal radiography is very useful in specific diseases, including certain gastrointestinal anomalies. This review provides image findings of normal plain abdominal radiography and some common abdominal pathology in infants and children.