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ABSTRACT: OBJECTIVE: This study was undertaken to describe 2 cases of localized Langerhans cell histiocytosis (LLCH) of the mandible that healed quickly following intralesional infiltration of corticosteroids. STUDY DESIGN: Two patients with LLCH of the mandible were treated in a 1-stage procedure with intralesional injection of methylprednisolone. Symptoms of pain were quickly relieved and the swelling receded. Periodic orthopantomogram and computerized tomography after corticosteroid injection revealed continuous regression of mandibular osteolysis and a favorable osseous consolidation in the lesions. CONCLUSIONS: The results of this report suggest that intralesional injection of corticosteroids should be the initial choice of treatment of LLCH of the mandible, especially in children to preserve tooth germs.
Oral surgery, oral medicine, oral pathology and oral radiology. 07/2012;
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ABSTRACT: Lipomas are most common benign mensenchymal neoplasm composed of mature adipocytes. But they are relatively infrequent on the oral and maxillofacial regions. In the present report, we report a rare case of bilateral involvement classic lipoma of the tongue. The patient was a 71-year-old man with asymmetric soft tissue nodules in both lateral borders of the tongue. The magnetic resonance imaging T1- and T2-weighted images demonstrated homogeneous high intensities similar to that of normal subcutaneous fat. The lesions were hypointense on the fat-suppressed T1 image. The tumors were resected surgically, and they exhibited the histopathologic features of classic lipomas, composed of mature fat cells. This suggests that differential diagnosis of intraoral multiple lipomatous nodules should include not only lipomatosis, but also multiple classic lipomas, notwithstanding the rare incidence of the latter.
Oral surgery, oral medicine, oral pathology and oral radiology. 07/2012; 114(1):e15-8.
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ABSTRACT: Abstract Purpose. This study was undertaken to compare wound healing following incisions with either a scalpel, CO(2) laser or Er,Cr:YSGG laser in Guinea pig oral mucosa. Materials and methods. Three types of wounds were randomly introduced with either a stainless steel scalpel, CO(2) laser or Er,Cr:YSGG laser in the buccal mucosa of each of 22 Guinea pigs. Four Guinea pigs were sacrificed on day 1, day 3 and day 5 post-surgery. Five Guinea pigs were sacrificed on day 7 and day 14 post-surgery. Biopsy samples from each oral mucosa wound were examined and the expression of TNF-α and TGF-ß1 was determined by immunohistochemical staining. Results. At day 3 post-surgery, the histological pattern of the healing process was similar in the scalpel and Er,Cr:YSGG laser wounds and there were more ulcerations present in the CO(2) laser wounds than in the scalpel and Er,Cr:YSGG laser wounds. The level of TNF-α expression was twice in the laser wounds that in the scalpel wounds. A higher level of TGF-β1 expression was seen at day 7 post-surgery and a lower level at day 14 post-surgery in the CO(2) laser wounds than in the scalpel and Er,Cr:YSGG laser wounds. Conclusions. The Er,Cr:YSGG laser has many advantages for oral surgery due to a low inflammatory response and minimal damage of the tissue. Although a CO(2) laser has better hemostatic ability, its use causes greater tissue damage than a scalpel and Er,Cr:YSGG laser. However, further larger studies would be needed before fully endorsing its widespread use.
Acta odontologica Scandinavica 12/2011; 70(6):448-54. · 1.41 Impact Factor
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ABSTRACT: This paper deals with an intelligent video surveillance system using object tracking and recognition techniques. The proposed
system integrates the object extraction, human recognition, face detection, object tracking, and camera control. First, the
object in the video frame is extracted using the background subtraction. Then, the object region is examined whether it is
human or not. For this recognition, the region-based shape descriptor, angular radial transform, is used to model the human
shapes. When the object is decided as human, the face detection is optionally performed to capture the clear face images.
Finally, the face or object region is tracked in the video frames, and the pan/tilt/zoom (PTZ) controllable camera also tracks
the moving object. The tracking filter updates the histogram information in the object region at every frame so that the moving
object is well tracked even though the poses and sizes of object are varied. Since the PTZ parameters can be transformed into
camera parameters such as rotation angles and focal length, we estimate the 3-D locations of moving object with multiple PTZ
camera. This paper constructs test system with multiple PTZ cameras and their communication protocol. According to the experiments,
the proposed system is able to track the moving person automatically not only in the image domain but also in the real 3-D
space. The proposed system improves the surveillance efficiency using the usual PTZ cameras.
KeywordsVisual surveillance–PTZ camera–object extraction–object tracking–shape recognition
08/2011: pages 471-482;
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18th IEEE International Conference on Image Processing, ICIP 2011, Brussels, Belgium, September 11-14, 2011; 01/2011
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ABSTRACT: This study compared wound healing following incisions with either a scalpel, a diode laser or an Er,Cr:YSGG laser in guinea pig oral mucosa.
Three types of wound were made randomly with either a stainless-steel scalpel, a diode laser or an Er,Cr:YSGG laser in the buccal mucosa of 24 guinea pigs. Five guinea pigs were sacrificed on each of Days 1, 3, 5 and 7 post-surgery. Four guinea pigs were sacrificed on Day 14 post-surgery. Biopsy samples from each oral mucosa wound were examined using light microscopy and the expression of tumor necrosis factor (TNF)-alpha and transforming growth factor (TGF)-beta1 was determined by immunohistochemical staining. The expression of TNF-alpha and TGF-beta1 was evaluated by calculating the percentage of positively stained cells and immunostaining intensity was evaluated using a scale ranging from 0 to 3.
Infiltration of inflammatory cells decreased rapidly at Day 5 post-surgery in all three groups of animals. The highest level of TNF-alpha expression was found at Day 1 post-surgery for the diode laser wounds. The intensity of TNF-alpha immunostaining was highest at Day 3 post-surgery and lowest at Day 7 post-surgery for all three groups of animals. For the scalpel wounds, a lower level of TGF-beta1 expression was seen until Day 3 post-surgery and a higher level from Day 7 post-surgery compared to laser wounds. The intensity of TGF-beta1 immunostaining was highest at Day 1 post-surgery for the diode laser wounds.
The diode laser is considered a good cutting device for oral mucosa; however, more tissue damage occurs than with the use of a scalpel or an Er,Cr:YSGG laser. Larger studies will be needed before fully endorsing the widespread use of the diode laser.
Acta odontologica Scandinavica 07/2010; 68(4):232-8. · 1.41 Impact Factor
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J. Visual Communication and Image Representation. 01/2010; 21:677-681.
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ABSTRACT: This paper proposes to obtain 3D modeling of object surface and to create a relit image in real-time. The proposed algorithm uses a single camera and synchronized stereo lights to capture the light field images by turning on and off the lights alternatively. The light field images from the controlled lighting approximate the reflectance models on object surfaces. The surface normal directions of object surface are modeled by the dichromatic reflectance model and Phong's shading geometry. The estimated normal map of object surface improves the rendering quality in image based relighting system. The proposed system is efficiently implemented in GPU-based programming, so it operates in real-time including 3D modeling and rendering. The proposed system is expected to be useful for video conference system, where the users can be immersed in video teleconference as if they were in a virtual environment.
IEEE Transactions on Consumer Electronics 12/2009; · 0.94 Impact Factor
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ABSTRACT: This paper deals with a real-time image based relighting system for tangible video teleconference. The proposed image based relighting system renders the extracted human object using the virtual environmental images. The proposed system can homogenize virtually the lighting environments of remote users on the video teleconference, or render the humans like they are in the virtual places. To realize the video teleconference, the paper obtains the reflectance models of users in real-time using the controlled lighting system. The reflectance models of human surface are obtained by a pair of lighting sources which are turned on and off alternatively. The images with different illuminations are exploited to model the reflectance on the object surfaces. The environment map for rendering is acquired by the mirror ball images or virtual background ones. And the relighting algorithm is implemented by GPU based programming for real-time operation. According to the simulations, the proposed system estimates the reflectance models of human faces, and relights the human faces in real-time. The objects are rendered by the reflectance models and virtual environment map. The proposed system enables the users to immerse video teleconference just as they are in the virtual environments.
IEEE Transactions on Consumer Electronics 09/2009; · 0.94 Impact Factor
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ABSTRACT: An automatic defect classification algorithm is proposed in a boosting manner. The proposed method exploits the histogram of spatial orientation and frequency features. Specifically, the spatial gradient orientations of defect image are accumulated to be a histogram, and they are trained by SVM to construct a classifier. The frequency features are the projection of 2D Haar patterns on the frequency responses. The classifiers using these spatial and frequency features are combined in a boosting manner to improve the classification performance. According to the experiments with 100 training and testing sets, the proposed boosting method improves the classification performance compared with the previous works using optical features such as colors, shapes, and sizes of defects.
IEEE Signal Processing Letters 06/2009; · 1.39 Impact Factor
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ABSTRACT: This paper proposes an interactive e-learning system using pattern recognition and augmented reality. The goal of proposed system is to provide students with realistic audio-visual contents when they are leaning. The proposed e-learning system consists of image recognition, color and polka-dot pattern recognition, and augmented reality engine with audio-visual contents. When the Web camera on a PC captures the current page of textbook, the e-learning system first identifies the images on the page, and augments some audio-visual contents on the monitor. For interactive learning, the proposed e-learning system exploits the color-band or polka-dot markers which are stuck to the end of a finger. The color-band and polka-dot marker act like the mouse cursor to indicate the position in the textbook image. Appropriate interactive audio-visual contents are augmented as the marker is located on the predefined image objects in the textbook. The proposed e-learning system was applied to the educational courses in the elementary school, and we obtained satisfactory results for real applications. We expect that the proposed e-learning system is popular when the educational contents and scenarios are sufficiently provided.
IEEE Transactions on Consumer Electronics 06/2009; · 0.94 Impact Factor
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ABSTRACT: The purpose of this study was to evaluate the clinical outcome and magnetic resonance imaging (MRI) changes of patients with temporomandibular joint (TMJ) internal derangement before and after performance of arthrocentesis and stabilization splint therapy.
Thirty-three patients with unilateral TMJ internal derangement that was successfully treated were included in this study. The clinical outcome and changes in the disc position, disc mobility, disc morphology, joint effusion, bone marrow edema pattern in the mandibular condyle, and the degenerative change before and after arthrocentesis and stabilization splint therapy were compared using MRI.
The average maximum mouth opening (MMO) was increased and the average pain during MMO was decreased significantly after treatment. The disc position, disc mobility, and joint effusion were significantly improved after treatment.
The results in this study indicate that arthrocentesis and stabilization splint therapy provide significant improvement in the clinical outcome, disc position, disc mobility and joint effusion.
Journal of oral and maxillofacial surgery: official journal of the American Association of Oral and Maxillofacial Surgeons 03/2009; 67(2):314-7. · 1.58 Impact Factor
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Proceedings of the International Conference on Image Processing, ICIP 2009, 7-10 November 2009, Cairo, Egypt; 01/2009
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ABSTRACT: The purpose of this study was to evaluate the relationship between magnetic resonance imaging (MRI) findings and the relative signal intensity (RSI) of retrodiscal tissue in patients with temporomandibular joint disorders (TMDs) and to determine the usefulness of RSI as a diagnostic marker.
One hundred and thirty-two temporomandibular joints in 66 TMD patients were analyzed. The signal intensities of regions of interest (ROIs) in retrodiscal tissues were measured using T2-weighted MRI. The RSIs of retrodiscal tissues were referenced to the signal intensities of the ROIs of brain gray matter. The relationships between the RSI of retrodiscal tissue and condylar degenerative change (Wilcoxon rank sum test), joint effusion (Wilcoxon rank sum test), disc position (Kruskal-Wallis test), pain (Wilcoxon rank sum test), and limited mouth opening (Wilcoxon rank sum test) were determined.
A strong association was seen between retrodiscal-tissue RSI and disc displacement, joint effusion, condylar degenerative change, and joint pain. Limited mouth opening did not significantly correlate with retrodiscal-tissue RSI.
The retrodiscal-tissue RSI for T2-weighted MRI is a valuable noninvasive tool for monitoring the progression of TMD. Additional clinical studies are warranted.
Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics 01/2009; 107(1):113-5. · 1.50 Impact Factor
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ABSTRACT: This paper deals with a panoramic mosaic system for mobile devices. The proposed system is optimized for mobile devices by integer-programmable algorithms and auto-shot user interface. The proposed system consists of auto-shot interface, transform onto cylindrical surface, color compensation, local alignment, image stitching, and blending. The auto-shot interface senses user's camera motion and takes pictures when the camera motion is matched to the predefined motion model. The captured images are projected onto a cylindrical mosaic surface by modified projection equation. Exposure difference is removed by color compensation, where the luminance differences between images are adjusted and color saturation is eliminated. The projected images are locally aligned by fast hierarchical hexagonal search technique. Then, the optimal boundary of overlapped images are determined using dynamic programming and synthesized seamlessly. According to the experiments using mobile devices, the proposed system shows good performance compared with other PC-based mosaic algorithms.
Image Processing, 2008. ICIP 2008. 15th IEEE International Conference on; 11/2008
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ABSTRACT: This paper proposes a video architecture and real-time lighting technology for tangible teleconference. The tangible teleconference is to homogenize virtually the lighting environments of remote users in the video conference. To realize the tangible teleconference, the paper proposes a video architecture which consists of color texture, specular reflection component, and lighting environment map of each user. The environment map is obtained by sampling the lighting sources on mirror ball image. And the proposed video architecture is implemented by GPU-based programming, and is optimized at GPU hardware for realtime operation. According to the simulations, the proposed video architecture and GPU-based rendering relight objects in real-time. The objects are rendered by the specular reflections and homogeneous environments of users. The proposed system enables the users to immerse video conference just as they are in the same environment.
Consumer Electronics, 2008. ISCE 2008. IEEE International Symposium on; 05/2008
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ABSTRACT: This paper proposes a panoramic image mosaic system for mobile devices. The proposed panoramic mosaic system is optimized for mobile devices by integer- programmable algorithms, and is user-friendly designed by 4- directional auto-shot interface. The proposed system consists of image acquisition by auto-shot interface, image transform onto cylindrical mosaic surface, luminance and color compensation, local alignment, image stitching, and blending. The images are automatically captured by the auto-shot interface which senses the user's camera motion and takes a picture when the camera motion is matched to the predefined motion model of images. The captured images are transformed and projected onto a cylindrical mosaic surface. Exposure difference is removed by color compensation, and the projected images are locally aligned by translational motion model. Then, the boundary of overlapped images are determined and synthesized by image stitching and blending. According to the experiments using real mobile devices, the proposed mosaic system shows good performance compared with other mosaic algorithms. Especially, since the proposed mosaic system operates on the usual mobile multimedia in real-time, the users can generate panoramic images easier than the personal computer based algorithms.
IEEE Transactions on Consumer Electronics 03/2008; · 0.94 Impact Factor
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ABSTRACT: We propose an embedded image panorama mosaic system which can operate in real-time in digital cameras or cellphone cameras. The users can check the panorama result as soon as all the images are acquired by the camera. The proposed system shows comparable performance to other PC-based methods.
Consumer Electronics, 2008. ICCE 2008. Digest of Technical Papers. International Conference on; 02/2008
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4th International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP 2008), Harbin, China, 15-17 August 2008, Proceedings; 01/2008
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Proceedings of the International Conference on Image Processing, ICIP 2008, October 12-15, 2008, San Diego, California, USA; 01/2008
