• Journal of International Society for Simulation Surgery
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• 제2권1호
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• pp.43-45
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• 2015

Recent progress on CT such as multi-detector row CT, oral contrast agents and multiplanar reconstruction have markedly improved the image quality as well as diagnostic performance of gastric cancer. Multiplanar reformatted images at predetermined orientations can be easily performed and embedded into routine CT protocol without increasing medical expense or labor. Currently, many institutions have adopted routine multiplanar reformatted protocols and therefore knowledge on them can improve the diagnostic accuracy of gastric cancer.

• 디지털콘텐츠학회 논문지
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• 제14권4호
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• pp.439-445
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• 2013

디지털 영상기술의 발전은 영화, 방송 등 영상산업 전반에 걸쳐 고화질 영상구현을 현실화 시켰다. 이러한 고화질의 영상은 혁신적인 디스플레이와 융합되면서 다양한 매체와 형태로 사용되고 있다. 아날로그 영상 제작 방식은 디지털 기술을 이용하여 영상 콘텐츠 제작에 합류하고 있다. 본 연구의 목적은 과거 아날로그 영상시스템의 하나인 시네라마 시스템을 디지털 기술에 응용하여 더 넓고 큰 대형화면에서 고화질의 다면영상을 재구성하는 방법을 제시한다.

• 디지털융복합연구
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• 제14권7호
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• pp.411-418
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• 2016

디지털 방송환경은 HDTV에 이어 UHDTV를 등장 시키었고, 이를 이용한 실감영상 제작 수효도 다양한 분야에서 응용되어지고 있다. 이러한 응용방법 중 HD 혹은 UHD급 디스플레이 여러 대를 상하좌우로 접합 시킨 후 고화질 영상 콘텐츠를 상영하는 다면 영상은 전시 영상 및 광고시장에서 자주 사용되고 있다. 현재 이러한 고화질 다면영상을 제작하는 업체는 대부분 자체 개발된 프로그램을 사용하여 제작하고 있어 일반적인 작업에 비해 많은 예산이 들어간다. 이러한 이유로 현재 대부분의 다면영상 콘텐츠 제작 방법은 HD급 영상 사이즈를 2~5배 이상으로 확대 사용하여 화질 열화가 많이 발생된다. 본 실험은 UHDTV로 구성한 다면영상에 널리 알려져 있는 소프트웨어를 이용하여 화질 열화 없이 초고선명 파노라마 실감영상 구현 하고자 한다.

• 대한치과교정학회지
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• 제48권3호
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• pp.143-152
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• 2018

Objective: This study examined cone-beam computed tomography (CBCT)-derived multiplanar-reconstructed (MPR) cross-sections to clarify the salient characteristics of patients with skeletal class III malocclusion with midface deficiency (MD). Methods: The horizontal and sagittal plane intersection points were identified for middle-third facial analysis in 40 patients in the MD or normal (N) groups. MPR images acquired parallel to each horizontal plane were used for length and angular measurements. Results: A comparison of the MD and N groups revealed significant differences in the zygoma prominence among female patients. The convex zygomatic area in the N group was larger than that in the MD group, and the inferior part of the midface in the N group was smaller than that in the MD group for both male and female patients. A significant difference was observed in the concave middle maxillary area among male patients. Conclusions: This study was conducted to demonstrate the difference between MD and normal face through MPR images derived from CBCT. Male patients in the MD group had a more flattened face than did those in the N group. Female patients in the MD group showed a concave-shaped lower section of the zygoma, which tended to have more severe MD. These findings indicate that orthognathic surgery to improve skeletal discrepancy requires different approaches in male and female patients.

• 대한치과교정학회지
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• 제48권5호
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• pp.346-346
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• 2018

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 춘계학술대회
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• pp.529-530
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• 2014

다면영상은 광고, 전시, 홍보 등 여러 분야에서 활용되고 있으나, 그 속에 적용되는 콘텐츠는 합성, 그래픽 등의 영상이 대부분이다. 바로 실사 영상으로 다면을 촬영하기가 매우 어려울 뿐만 아니라 촬영단계에서의 문제점들을 후반작업에서도 보완하기 어렵기 때문이다. 이에 본 연구에서는 촬영과 후반작업에서의 문제점을 파악한 후, 개선방안을 실험하여 검증하고자 한다. 구체적인 연구방법으로는 카메라 간 거리에 따라 변화하는 영상의 가장자리에서 발생하는 왜곡을 최소화하기 위한 거리를 구하는 실험을 진행하고자 한다. 이를 토대로 다면영상의 매체적 탁월성을 보다 효과적으로 활용할 수 있는 실사기반의 콘텐츠 생산에 기여하고자 한다.

• 한국방사선학회논문지
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• 제12권7호
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• pp.813-819
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• 2018

MDCT의 3D 유용성을 입증하기 위해 쇄골하 혈전증을 수반한 73세 남자 환자를 대상으로 MIP, 볼륨렌더링, MPR의 3D 영상을 획득하여 쇄골하동맥의 혈전증을 명확하게 탐지하고 위치를 확인하여 임상에서 기초자료를 제공하여 환자의 진단 및 치료에 적용하고자한다. 스캔 데이터를 3차원 CT영상인 MIP, 볼륨렌더링, curve multiplanar reformation (MPR), virtual endoscopy 영상을 획득하였다. CT검사 환자의 데이터를 3D 프로그램으로 전송한 영상에서 3D 프로그램에서 측정한 상행대동맥은 364.28 HU, 좌총경동맥 413.77 HU, 좌쇄골하동맥 15.72 HU로 낮게 산출되었다. MIP coronal 영상으로 좌측의 쇄골하동맥의 혈전으로 폐쇄를 정확하게 보여주고 있다. 볼륨렌더링 3차원 영상으로 투과도 100%, 87-1265 HU를 적용하여 쇄골하동맥과 뼈를 동시에 묘출하고 있으며, 좌측 쇄골하동맥의 폐쇄 영상을 선명하게 보여주었으며 coronal curved MPR 및 sagittal curved MPR 영상으로 혈전의 의한 쇄골하동맥의 폐쇄를 3D 영상 처리 기능을 이용하여 정확하게 묘출하고 있다. 혈전에 의한 쇄골하동맥 폐쇄 증상 환자를 MDCT로 스캔하여 3D 영상 기법을 응용하여 쇄골하동맥의 폐쇄를 확인할 수 있어 임상에서 3D 기법을 응용하여 적절하게 진단에 적용할 수 있다.

• Imaging Science in Dentistry
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• 제33권3호
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• pp.137-141
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• 2003

Purpose: To evaluate the precision of measurements taken of dental implants in bucco-lingually sectioned views of the maxilla by linear tomograms of the panorama and to assess the visibility of the inferior wall of the maxillary sinus. Materials and Methods : Eighty sites prepared with implants of gutta percha cone in the sockets of the upper premolars and molars of 10 dry skulls were radiographically examined using linear tomograms of panorama, and scanned coronally and axially by computed tomography. The differences in mm between the measurements in bucco-lingually sectioned images of maxillary alveolar bone and the true length and width of the implanted gutta percha cones were compared as mean values (mean) and standard deviations (SD) for each radiographic technique. Linear tomography of panorama was compared with computed tomography for visualization of the relationship between the inferior wall of maxillary sinus and the end of each implant. Results: The deviations between the actual implant length and the measured values taken from the linear tomograms (0.44±0.39 mm) was significantly less than the measured values from the multiplanar reconstructed images of the axially scanned computed tomogram (1.21 ± 0.90 mm). There was statistically significant difference (p < 0.05) between two techniques in the differences between the measurements and true implant length. The relationship of the inferior border of maxillary sinus with end of implant was worse identified with the linear tomogram of panorama (68%) than the multiplanar reconstructed image of axially scanned computed tomogram (99%). Conclusion: We could not find any differences in the accuracy of length measurement between the linear tomogram of panorama and computed tomogram, but computed tomogram allowed for a better visualization of the inferior wall of the maxillary sinus than the linear tomogram.

• Imaging Science in Dentistry
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• 제33권3호
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• pp.187-193
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• 2003

Purpose: To compare the measurements of the mandible and the detectability of the mandibular canal on reformatted images using a newly developed 3-dimensional implant simulation program with traditionally used CT multiplanar reconstruction program and true measurements. Materials and Methods: Ten dry dog mandibles were used in this study. Occlusal templates for CT examination were fabricated and marked with gutta perch a at ten sites. Axial CT scans were taken and reconstructed using DentaScan (D group) and Vimplant program (V group), and each mandible was sectioned at the previously marked sites (R group). Maximum vertical height (H) and maximum width (W) of the mandible, the distances from buccal border of the mandibular canal to the most buccal aspect of the mandible (X), and the distance from the superior border of the mandibular canal to the alveolar crest (Y) were measured, and the mandibular measurements in each group were compared. Detectability of mandibular canal was evaluated using a 3-point scale in both V and D groups by three oral radiologists and compared. Results: H in the V group was slightly greater than that in the D group, and Wand X in the V group was slightly less than those in the D group. H in the V group was less than that in the R group, and Wand X in the V group was larger than those in the R group. The detectability of the mandibular canal did not show statistically significant differences between V and D groups. Conclusion: The results of the experiment show that the newly developed, inexpensive Vimplant/TM/ simulation program can be used as an alternative to the traditionally used, and more expensive CT multiplanar reconstruction program.

• 치과방사선
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• 제29권1호
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• pp.7-20
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• 1999

Magnetic resonance imaging with its superior soft tissue contrast resolution and absence of beam hardening artifacts, combined with its ability to perform multiplanar imaging, is now effective tool in diagnostic imagings. Magnetic resonance is primarily a phenomenon that involves atomic nuclei. It provides totally new clinical informations with no known hazards through the use of very weak interactions with endogenous stable magnetic atomic nuclei. This article briefly summarizes the basic mechanism of generation and detection of the signals and general sorts of tissue properties which can influence the signals and thereby give rise to tissue contrast. It also describes how the machine-operating parameters can be used to manipulate the tissue contrast observed in the image.