• Imaging Science in Dentistry
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• 제48권3호
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• pp.167-176
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• 2018

Purpose: In the age of X-ray computed tomography (CT) and digital volume tomography (DVT), with their outstanding post-processing capabilities, indications for planar radiography for the study of the dentition of ancient Egyptian mummies may easily be overlooked. In this article, the advantages and limitations of different approaches and projections are discussed for planar oral and maxillofacial radiography using portable digital X-ray equipment during archaeological excavations. Furthermore, recommendations are provided regarding projections and sample positioning in this context. Materials and Methods: A total of 55 specimens, including 19 skeletonized mandibles, 14 skeletonized skulls, 18 separate mummified heads, and 4 partially preserved mummies were imaged using portable digital X-ray equipment in the course of archaeological excavations led by the University of Basel in the Valley of the Kings between 2009 and 2012. Images were evaluated by 2 authors with regard to the visibility of diagnostically relevant dental structures using a 4-point grading system(Likert scale). Results: Overall, the visibility of diagnostically relevant dental structures was rated highest by both authors on X-ray images acquired using a dental detector. The tube-shift technique in the lateral projections of mandibular dentition achieved the second-best rating, and lateral projections achieved the third-best rating. Conclusion: Conventional planar digital X-ray imaging, due to its ubiquity, remains an excellent method-and often the only practicable one-for examining the skulls and teeth of ancient Egyptian mummies under field conditions. Radiographic images of excellent diagnostic quality can be obtained, if an appropriate methodology regarding the selected projections and sample placement is followed.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2017년도 제55차 동계학술대회논문집 25권1호
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• pp.235-238
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• 2017

This study was to develop a portable digital radiography (PDR) system with a function measuring the X-ray source-with-detector angle (SDA) and to evaluate the imaging performance for the diagnosis of chest imaging. The SDA device consisted of an Arduino, an accelerometer and gyro sensor, and a Bluetooth module. According to different angle degrees, five anatomical landmarks on chest images were assessed using a 5-point scale. Mean signal-to-noise ratio and contrast-to-noise ratio were 182.47 and 141.43. Spatial resolution (10% MTF) and entrance surface dose were 3.17 lp/mm ($157{\mu}m$) and 0.266mGy. The angle values of SDA device were not significant difference as compared to those of the digital angle meter. In chest imaging, SNR and CNR values were not significantly different according to different angle degrees (repeated-measures ANOVA, p>0.05). The visibility scores of the border of heart, 5th rib and scapula showed significant differences according to different angles (rmANOVA, p<0.05), whereas the scores of the clavicle and 1st rib were not significant. It is noticeable that the increase in SDA degree was consistent with the increase of visibility score. Our PDR with SDA device would be useful to be applicable to clinical radiography setting according to the standard radiography guideline at various fields.

• 대한방사선기술학회지:방사선기술과학
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• 제40권1호
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• pp.7-12
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• 2017

본 연구는 일개대학병원의 디지털 이동방사선검사 장비를 대상으로 이동방사선검사 시 검출기와 장비의 세균학적 오염도를 조사하여 이동방사선검사 장비로 인한 병원감염을 예방하고자 실시하였다. 중환자실 감염관리 환자는 검출기위에 비닐을 씌우고 검사를 실시한 후 비닐 위에서 검체를 채취한 결과 CNS, VRE가 검출되었고 비닐을 제거한 검출기에서는 균이 발견되지 않았다. 일반병실 환자를 연속해서 검사한 결과, 1번 환자에서는 균이 발견되지 않았고, 2번과 3번 환자에서는 CNS, 4번 환자는 CNS, Enterococcus faecalis, 5번 환자는 CNS, Enterococcus casseliflavus, 6번 환자에서는 CNS, Enterococcus casseliflavus, Klebsiella pneumoniae가 검출되었다. 조사야 조절 손잡이에서는 CNS, Enterococcus faecium이 검출되었다. X-선 발생스위치, 검출기 손잡이에서는 CNS가 검출되었다. 검사 후 방사선사의 진료 장갑에서는 CNS, Enterococcus gallinarum, Klebsiella pneumoniae가 검출되었다. 따라서 1회 검사 후 검출기를 소독하고 재검사 하는 방법과 검출기에 1회용 비닐을 씌워 검사한 후 제거하는 방법을 권장하며, 진료장갑은 1회 검사 후 반드시 새로운 장갑으로 교체해야 한다. 또한, 검사 중 많이 조작하는 조사야 조절 손잡이의 철저한 소독과 근무자의 감염교육을 통해 이동방사선검사로 인한 병원감염을 예방하여야 한다.

• 대한디지털의료영상학회논문지
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• 제12권1호
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• pp.5-8
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• 2010

Opened a court in February 10, 2006, a rule of safety management of the diagnosis radiation system was promulgated for safety of the radiation worker, patients and patients' family members. The purpose of this rule is to minimize the risk of being exposed to radiation during the process of handling X-ray. For this reason, we manufactured shielding device of mobile X-ray unit collimator for diminution of skin dose. Shielding device is made to a thickness of Pb 0.375mm. For portable chest radiography, we measured skin dose 50cm from center ray to 200cm at intervals of 20cm by Unfors Xi detector. As a result, a rule of safety management of the diagnosis radiation system has been strengthened. But there are exceptions, such as ER, OR, ICU to this rule. So shielding device could contribute to protect unnecessary radiation exposure and improve nation's health.

• 한국정보통신학회논문지
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• 제19권7호
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• pp.1737-1742
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• 2015

물품 검사를 위한 산업현장에서는 물품의 표면뿐만 아니라 내부 부품결함 검사 또한 필요하다. 일반적으로 생산 공정에서의 물품 검사로 광학 검사를 많이 이용한다. 하지만 이는 표면상의 결함만을 검사할 뿐 물품 내부의 검사를 수행하기는 어렵다. 이러한 제한점을 극복하기 위해 광학 장치 대신 휴대용 X-선 DR 영상 획득 장치를 이용하여 영상을 실시간으로 얻는 동시에 제품 불량을 판별할 수 있는 시스템을 개발하였다. X-선 영상을 얻은 후 머신영상 처리를 통해 설정한 기준 값에 오차범위를 허용하면 통과, 그렇지 않으면 불량으로 인식되도록 시스템을 개발하였다. 또한, 물품의 불량 유무 결과와 그 수치는 사용자가 저장할 수 있도록 하였다.