• Title/Summary/Keyword: Contouring

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Development of PC-based Radiation Therapy Planning System

  • Suh, Tae-Suk;P task group, R-T
    • Proceedings of the Korean Society of Medical Physics Conference
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    • 2002.09a
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    • pp.121-122
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    • 2002
  • The main principle of radiation therapy is to deliver optimum dose to tumor to increase tumor cure probability while minimizing dose to critical normal structure to reduce complications. RTP system is required for proper dose plan in radiation therapy treatment. The main goal of this research is to develop dose model for photon, electron, and brachytherapy, and to display dose distribution on patient images with optimum process. The main items developed in this research includes: (l) user requirements and quality control; analysis of user requirement in RTP, networking between RTP and relevant equipment, quality control using phantom for clinical application (2) dose model in RTP; photon, electron, brachytherapy, modifying dose model (3) image processing and 3D visualization; 2D image processing, auto contouring, image reconstruction, 3D visualization (4) object modeling and graphic user interface; development of total software structure, step-by-step planning procedure, window design and user-interface. Our final product show strong capability for routine and advance RTP planning.

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Clinical Experience of Countouring Fasciocutaneous Flap Using Ultrasound Assisted Liposuction (유리 근막 피판 수술 후 초음파 지방 흡입술을 이용한 피판 축소술의 임상경험)

  • Kim, Tae-Gon;Hong, Joon-Pio;Chung, Yoon-Kyu
    • Archives of Reconstructive Microsurgery
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    • v.12 no.2
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    • pp.99-104
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    • 2003
  • Liposuction is a useful method for debulking free flap. Recently, ultrasound assisted liposuction(UAL) has been reported to have many advantages over conventional suction-assisted lipectomy. We applied the UAL to debulk free fasciocutaneous flap of the forehead and lower extremities. The result was satisfactory and there was no significant complications worth noting. Although the cost can be expensive, it has many advantages such as less blood loss, larger amount of fat aspirate and better skin contraction. We can conclude that UAL can be a useful alternative method to debulk free fasciocutaneous flap.

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Experiences of Abdominoplasty without Undermining (박리없는 복부성형술의 경험)

  • Sim, Hyung Bo;Yoon, Sang Yup
    • Archives of Plastic Surgery
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    • v.33 no.3
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    • pp.303-307
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    • 2006
  • No one technique provides an optimal outcome for all body contouring patients. There are many surgical options for abdominoplasty. Among these, this abdominoplasty without undermining consists of liposuction around abdominal subcutaneous fatty tissue, excision of lower abdominal flap. The procedure allows aggressive thinning and sculpting of abdominal flap. This operation minimizes the dead space, which often leads to postoperative complications, and preserves neurovascular supply to the abdominal skin. From 1999 to 2004, 18 patients underwent the abdominoplasty without undermining, resulting in high satisfaction rates with no significant complications, such as, pulmonary embolism and deep vein thrombosis. Patients could return to normal activity within a week. This abdominoplasty without undermining is an effective and safe alternative with low complication rate and enhances aesthetic results compared to traditional abdominal surgery.

Transitional Denture의 이론적 배경과 임상적 응용에 관한 연구

  • Kim, Yung-Soo;Ku, Ok-Kyung;O, Ba-U
    • The Journal of the Korean dental association
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    • v.12 no.5
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    • pp.339-344
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    • 1974
  • The authors conducted a study of theoritical background and clinical application of the transitional denture with one subject at The Ohio State University, Graduate School. The applicability of this method is considered to be not so great, however, it is likely to be a advantageous way of approaching to the prospective denture patients with severe periodontal diseases. Especially, in this transitional denture technique, natural teeth are duplicated to reject the development of abnormal oral physiology and some effects occuring during edentulous period. As a result of the minimal surgery and protective measure of denture contouring and tissue conditioning, the transitional denture may show treatment effects to the dentrue surrounding tissues and basal seat tissues.

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A Study on the COntour Machining of Text using CNC Laser Machine (CNC레이저 가공기를 이용한 활자체 가공에 관한 연구)

  • 구영회
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1999.10a
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    • pp.554-559
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    • 1999
  • The purpose of this study is the machining of texture shapes by the contour fitting data. The hardware of the system comprises PC and scanning system, CO2 laser machine. There are four steps, (1) text image loading using scanning shapes or 2D image files, (2) generation of contour fitting data by the line and arc, cubic Bezier curve, (3) generation of NC code from the contouring fitting data, (4) machining by the DNC system. It is developed a software package, with which can conduct a micro CAM system of CNC laser machine in the PC without economical burden.

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Optimal Tuning of Linear Servomechanisms using a Disturbance Observer (외란관측기를 이용한 리니어 서보메커니즘의 최적튜닝)

  • Hong, Seong-Hwan;Chung, Sung-Chong
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.926-931
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    • 2008
  • In order to design a high-performance controller with excellent positioning and tracking performance, an optimal tuning method based on the integrated design concept is studied. DOBs, feedforward controllers and CCC are applied to control the bi-axial linear servomechanism. To derive accurate dynamic models of mechanical subsystems equipped with linear servos for the integrated tuning, system identification processes are conducted through the sine sweeping. An optimal tuning problem with stability, robustness and overshoot constraints is formulated as a nonlinear constrained optimization problem. Optimal gains are obtained through the SQP method. Experimental results confirm that both tracking and contouring errors are significantly reduced by applying the proposed controller and integrated tuning method.

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Realtime 3D Reconstruction of the Surface on Cross Sectional Contour in CT Image (단면 윤곽선을 이용한 표면의 실시간 3차원 재구성)

  • Koo, J.Y.;Jung, S.B.;Min, H.G.;Hong, S.H.
    • Proceedings of the KOSOMBE Conference
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    • v.1998 no.11
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    • pp.189-190
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    • 1998
  • In this paper, we show the realtime 3D reconstruction algorithm with the sliced CT images. The preprocessing is thresholding, labeling, contouring, and extracting dominant point. we reconstruct 3D image with dominant points using dynamic matching technique. The software implemented in Visualc++ 5.0 as a window-based application program.

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The Hierarchical Interpolation of the Coastal Echo Sounding Data (연안 해역 음향 측심 자료의 계층적 보간)

  • 이석찬;이창경
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.9 no.1
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    • pp.63-73
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    • 1991
  • The data type of the echo sounding for the contouring of coastal chart is continuous profiles, and there are no data between the profiles. In this study, at first, the depths of the regular grid along the sounding line were interpolated by linear equation. After that the depths of the regular grid located between the profiles were interpolated by kriging. The semivariogram contributes to the weight of interpolation. After comparison with the conventional Moving Average and Kriging, it turns out that this algorithm shows merits in the field of the accuracy and computing time.

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APPLICATION OF RECONSTRUCTION PLATE USING SIMPLE CONDYLAR REPOSITIONING MINIPLATE AFTER SEGMENTAL RESECTION OF MANDIBLE (하악골 절제술후 간단한 과두재위치 소형금속판을 이용한 재건 금속판의 적용: 증례보고)

  • Kim, Young-Kyun
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.28 no.3
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    • pp.231-233
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    • 2002
  • Temporary reconstruction of the mandibular continuity defect resulting from the ablative tumor surgery with a reconstruction plate can be used for the preservation of normal facial contour and oral function and for periodic follow up of recurrence. Reconstruction plates are adapted to the bone before the resection and provisionally fixated with some screws. Accurate contouring and adaptation are very important for the prevention of displacement of bony stumps and decubituous skin ulcer. However, if there is large expanding buccal tumor mass in mandible, it is very difficult or even impossible to contour the plate before resection. I, therefore, introduce the reconstruction plate application technique using a simple condylar repositioning miniplate after segmental mandibular resection.

Control of Servo System with Fuzzy Observer (Fuzzy Observer를 이용한 서보 시스템의 제어)

  • Ryu, Je-Young;Park, Eik-Dong;Huh, Uk-Youl;Lee, Je-Hi
    • Proceedings of the KIEE Conference
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    • 2000.07d
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    • pp.2461-2463
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    • 2000
  • This paper presents a scheme for designing a fuzzy observer for servo control system with nonlinear element, i.e., backlash. It is found that backlash occurs when the feed direction is reversed. Due to the imperfect transient response of the driving mechanism, not only the static backlash error but also the dynamic backlash error is generated on the contouring profile. And also, we utilized two inertia modeling in order to deals with coupled system accurately. The overall control system consists of two parts - a servo controller and an Fuzzy obsever. It is a Takagi-sugeno type fuzzy model whose consequent part is of the state space form is obtained. A simulation is carried out to demonstrate the effectiveness of the proposed scheme.

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