• Journal of Radiation Protection and Research
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• 제40권1호
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• pp.17-24
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• 2015

To improve accuracy of dose calculation on kilovoltage cone beam computed tomography (kV CBCT) images, a custom-made phantom was fabricated to acquire an accurate CT number to electron density curve by full scatter of cone beam x-ray. To evaluate the dosimetric accuracy, 9 volumetric modulated arc therapy (VMAT) plans for head and neck (HN) cancer and 9 VMAT plans for lung cancer were generated with an anthropomorphic phantom. Both CT and CBCT images of the anthropomorphic phantom were acquired and dose-volumetric parameters on the CT images with CT density curve (CTCT), CBCT images with CT density curve ($CBCT_{CT}$) and CBCT images with CBCT density curve ($CBCT_{CBCT}$) were calculated for each VMAT plan. The differences between $CT_{CT}$ vs. $CBCT_{CT}$ were similar to those between $CT_{CT}$ vs. $CBCT_{CBCT}$ for HN VMAT plans. However, the differences between $CT_{CT}$ vs. $CBCT_{CT}$ were larger than those between $CT_{CT}$ vs. $CBCT_{CBCT}$ for lung VMAT plans. Especially, the differences in $D_{98%}$ and $D_{95%}$ of lung target volume were statistically significant (4.7% vs. 0.8% with p = 0.033 for $D_{98%}$ and 4.8% vs. 0.5% with p = 0.030 for $D_{95%}$). In order to calculate dose distributions accurately on the CBCT images, CBCT density curve generated with full scatter condition should be used especially for dose calculations in the region of large inhomogeneity.

• 한국의류학회지
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• 제41권6호
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• pp.1085-1097
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• 2017

In the era of new media, images hold an important position as episteme to express and convey ideas. Fashion films provide dynamic and unique fashion images, differentiated from prior fashion media as a representational tool for showing a realistic fashion image only; consequently, their production and spread are increasing rapidly as a new fashion media. This study identifies the meaning and type of fashion images in fashion films based on the concept of Deleuze's image that help discover distinctive characteristics of fashion films as a new fashion media of an expressive tool. Literature research was conducted on new media, concepts and types of images by Deleuze to analyze types of new media images. According to research, fashion image in fashion film is defined as a fashion event; consequently, three types of new media images are derived. As the result of the empirical study, fashion images in fashion films are classified by images of realistic movement, variable time, and virtual experience. The results of the consideration show that fashion films expressed fashion through temporality and narrative, senses, and diegesis. Fashion images of new media in fashion films portray fashion as a process that transcends reality and imagination.

• Imaging Science in Dentistry
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• 제32권3호
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• pp.175-179
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• 2002

Follicular carcinomas are the second most common form of thyroid cancer, accounting for 10 to 20% of all thyroid cancers. Follicular carcinomas have a propensity to metastasize via the bloodstream, spreading to bone, lungs, liver, and elsewhere. We described the case of a 48-year-old woman who presented with swelling of the left preauricular area, which was a consequence of a metastatic follicular carcinoma of the masticator space. Plain films showed illdefined erosive bony changes from the left condylar head to the mandibular notch. Contrast-enhanced CT images showed a well circumscribed round mass with well enhancement within left masticator space. On MR images, the mass was heterogenously hyperintense to the muscle on T2-weighted images and isointense or hyperintense to the muscle on Tl-weighted images, and showed good enhancement on contrast-enhanced Tl-weighted images. Upon microscopic examination, the metastatic mass was found to be composed of fairly uniform cells forming small follicles containing colloid, showing capsular and vascular invasion.

• 한국측량학회지
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• 제36권5호
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• pp.413-422
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• 2018

Many applications using satellite data from high-resolution multispectral sensors require an image fusion step, known as pansharpening, before processing and analyzing the multispectral images when spatial fidelity is crucial. Image fusion methods are to improve images with higher spatial and spectral resolutions by reducing spectral distortion, which occurs on image fusion processing. The image fusion methods can be classified into MRA (Multi-Resolution Analysis) and CSA (Component Substitution Analysis) approaches. To suggest the efficient image fusion method for Pleiades and KOMPSAT (Korea Multi-Purpose Satellite) 3 satellites, this study will evaluate image fusion methods for multispectral and panchromatic images. HPF (High-Pass Filtering), SFIM (Smoothing Filter-based Intensity Modulation), GS (Gram Schmidt), and GSA (Adoptive GS) were selected for MRA and CSA based image fusion methods and applied on multispectral and panchromatic images. Their performances were evaluated using visual and quality index analysis. HPF and SFIM fusion results presented low performance of spatial details. GS and GSA fusion results had enhanced spatial information closer to panchromatic images, but GS produced more spectral distortions on urban structures. This study presented that GSA was effective to improve spatial resolution of multispectral images from Pleiades 1A and KOMPSAT 3.

• 복식
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• 제57권9호
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• pp.76-87
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• 2007

Since the emergence of postmodernism, as interest in human has increased, human face image is being highlighted as one of the themes that are addressed the most. Making the images of faces and individuals shown in costumes the subject matter, this thesis examines the internal values immanent in the images in more depth and understands them based on the Panofsky's iconological interpretation scheme. This study aims to identify designer's purposes and even their unconscious intention through iconological interpretation of faces shown in the fashion and images shown in human image, and further to present basic materials in the fashion design. This research used literature reviews and case studies, and used Panofsky's iconological interpretation theory as the scheme in order to interpret the symbolic significance implied in the images. The images of faces and individuals shown in costumes were classified into six types through historical reviews, and based on the types the images of faces and individuals shown in the fashion since the 20th century were examined. The iconological analysis of the images of faces and individuals shown in costumes based on the classification of types according to historical reviews showed parodies, cultural identity, commercial use, eroticism, respect for heros and its fiction. This study has found that all such things finally return to humanism that humans should be valued and loved the most.

• 한국지구과학회지
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• 제28권3호
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• pp.277-288
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• 2007

이 연구는 교수요목기부터 7차 교육과정에 이르기까지 '날씨'와 '일기예보'를 다루고 있는 시각적 이미지를 사회-기호학적 관점으로 분석하였다. 연구결과 대부분의 시각적 이미지는 실제 세상의 현상을 묘사하는 '실체형'인 것으로 나타났다. 이는 모든 시기의 초등 과학 교과서의 시각적 이미지는 대부분 학생들에게 친숙하였음을 의미한다. 시각적 이미지와 학생 사이의 의사소통에 대한 주도권 양상은 복잡하게 나타났다. 또한 초등학교 과학 교과서의 시각적 이미지들은 시기에 관계없이 대부분 기하학적 코드나 숫자 문자 등을 사용하지 않는 것으로 나타났다. 이 연구는 시각적 이미지의 정보의 양과 형태, 구조 및 사회적 의미 등을 해석하는 새로운 분석도구를 제안해준다. 또한 차기 과학교과서의 이미지 선택에 사회-기호학적 관점을 도입하는 하나의 전기가 될 것이다.

• Imaging Science in Dentistry
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• 제40권2호
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• pp.69-74
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• 2010

Purpose : The research was performed to predict the three dimensional relationship between the impacted mesiodens and the maxillary central incisors and the proximity with the anatomic structures by comparing their panoramic images with the CT images. Materials and Methods : Among the patients visiting Seoul National University Dental Hospital from April 2003 to July 2007, those with mesiodens were selected (154 mesiodens of 120 patients). The numbers, shapes, orientation and positional relationship of mesiodens with maxillary central incisors were investigated in the panoramic images. The proximity with the anatomical structures and complications were investigated in the CT images as well. Results : The sex ratio (M : F) was 2.28 : 1 and the mean number of mesiodens per one patient was 1.28. Conical shape was 84.4% and inverted orientation was 51.9%. There were more cases of anatomical structures encroachment, especially on the nasal floor and nasopalatine duct, when the mesiodens was not superimposed with the central incisor. There were, however, many cases of the nasopalatine duct encroachment when the mesiodens was superimpoised with the apical 1/3 of central incisor (52.6%). Delayed eruption (55.6%), crown rotation (66.7%) and crown resorption (100%) were observed when the mesiodens was superimposed with the crown of the central incisor. Conclusion : It is possible to predict three dimensional relationship between the impacted mesiodens and the maxillary central incisors in the panoramic images, but more details should be confirmed by the CT images when necessary.

• 복식
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• 제61권2호
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• pp.131-151
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• 2011

The study alms to identify how the symbols and images of Greek Roman myths in contemporary fashion have been reflected in respects of meaning and forms, and to find out the organic course from meaning to forms by using Durand's classification. The results define the significance of Greek Roman myths in contemporary fashion, and systematically suggest a direction of imagination for more creative design. In the diurne regime, the symbolism of purity, heroism and fear appeared. In the nocturne regime, the symbolism of maternity and sensuality appeared. In the dramatic regime, the symbolism of androgyny appeared. The characteristics of designs contained in each symbolism are common. In this regard, it is possible to trace organic relationships in the creation of images through the verbal scheme. In addition, the verbal scheme creates archetypal images that lead to images and symbols in the socio-cultural context, so it is possible to analyze the relationships between archetypal images and the format of garments. The study examined how the archetypal images that appeared in the mythical images were expressed in garments through the verbal system.

• 대한방사선치료학회지
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• 제28권2호
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• pp.123-130
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• 2016

목 적 : Computerized imaging reference systems 동적팬텀을이용한 cone-beamcomputed tomography(CBCT) 영상과 four-dimensionalcomputed tomography(4DCT) 영상의 체적을 비교분석 하고자 한다. 대상 및 방법 : 동적팬텀 내에 직경 1, 2, 3 cm 노드를 각각 삽입하고, CT simulator와 TruebeamSTx X-ray Imaging system을 이용하여 4DCT 영상과 CBCT 영상을 얻었다. 4DCT 영상은 maximum intensity projection(MIP), minimum intensity projection(MinIP), 그리고 average intensity projection(AVG)영상으로 재구성 하고 노드의 체적은 Eclipse system의 CT ranger tool로 CT number를 설정하여 측정하였다. 결 과 : CBCT를 기준으로 노드1, 2, 3 cm의 체적을 비교하였을 때 4DCT의 MIP는 0.54~2.33, 5.16~8.06, 9.03~20.11 ml, MinIP는 0.00~1.48, 0.00~8.47, 1.42~24.85 ml, AVG는 0.00~1.17, 0.00~2.19, 0.04~3.35 ml의 차이를 보였다. 결 론 : 노드의 체적을 비교한 결과 CBCT 영상은 4DCT의 AVG 영상과 유사한 것으로 확인되었다.

• 한국컴퓨터그래픽스학회논문지
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• 제24권5호
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• pp.31-39
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• 2018

본 논문에서는 흉부 CT 영상에서 결절의 밝기값, 재질 및 형상 증강 영상 기반의 GGN-Net을 이용해 간유리음영 결절 자동 분류 방법을 제안한다. 첫째, 입력 영상에 결절 내부의 고형 성분의 유무 및 크기 정보가 포함될 수 있도록 밝기값, 재질 및 형상 증강 영상의 활용을 제안한다. 둘째, 다양한 입력 영상을 여러 개의 컨볼루션 모듈을 통해 획득한 특징맵을 내부 네트워크에서 통합하여 훈련하는 GGN-Net를 제안한다. 제안 방법의 분류정확성 평가를 위해 순수 간유리음영 결절 90개와 고형 성분의 크기가 5mm 미만인 혼합 간유리음영 결절 38개, 5mm 이상 고형 성분의 크기를 가지는 혼합 간유리음영 결절 23개의 데이터를 사용하였으며, 입력 영상이 간유리음영 결절 분류 결과에 미치는 영향을 비교하기 위해 다양한 입력 영상을 구성하여 결과를 비교하였다. 실험 결과, 밝기값, 재질 및 형상 정보가 함께 고려된 입력 영상을 사용한 제안 방법이 정확도가 82.75%로 가장 좋은 결과를 보였다.