No abstract available.
Serum Albumin ; Track and Field

It is essential to search medical information precisely and efficiently in every aspect of medical practices and research activities. The growth of the medical literature has been tremendous in recent years, as exemplified by the annual growth of 710,000 records in MEDLINE in 2009, thus increasing the complexities of literature searching. Yet database search environments are changing toward very user-friendly ways facilitated by various hypertext linking capabilities such as "LinkOuts" to full texts and "reference linkings" among articles using Digital Object Identifiers (DOIs). Once a direct search of a keyword is initiated, a searcher can continue searching endlessly and seamlessly by simply clicking various links provided in the records retrieved. Search behaviors of researchers are changing accordingly, avoiding any complex or advanced searches. The basics of database search methods are described in this paper. A brief overview of major medical databases is given by database type to illustrate the differences in the information retrievable from such databases: MEDLINE/PubMed and KoreaMed are abstract databases; SCI/Web of Science, SCOPUS and KoMCI are citation indexes; and PubMed Central and Synapse are full text databases. Some of the advanced search features of each database are also noted: searches using MeSH terms in PubMed and KoreaMed; differences in the "related documents" algorithms of PubMed and SCI; citation analysis using "analyze results" in Web of Science and SCOPUS; and citation tracking in Synapse and PubMed. The Journal of the Korean Medical Association (JKMA) records are used for the illustration of such features.
Hypermedia ; Synapses ; Track and Field

Studies on target motion in 4-dimensional radiotherapy are being world-widely conducted to enhance treatment record and protection of normal organs. Prediction of tumor motion might be very useful and/or essential for especially free-breathing system during radiation delivery such as respiratory gating system and tumor tracking system. Neural network is powerful to express a time series with nonlinearity because its prediction algorithm is not governed by statistic formula but finds a rule of data expression. This study intended to assess applicability of neural network method to predict tumor motion in 4-dimensional radiotherapy. Scaled Conjugate Gradient algorithm was employed as a learning algorithm. Considering reparation data for 10 patients, prediction by the neural network algorithms was compared with the measurement by the real-time position management (RPM) system. The results showed that the neural network algorithm has the excellent accuracy of maximum absolute error smaller than 3 mm, except for the cases in which the maximum amplitude of respiration is over the range of respiration used in the learning process of neural network. It indicates the insufficient learning of the neural network for extrapolation. The problem could be solved by acquiring a full range of respiration before learning procedure. Further works are programmed to verify a feasibility of practical application for 4-dimensional treatment system, including prediction performance according to various system latency and irregular patterns of respiration.
Humans ; Learning ; Respiration ; Track and Field

Studies on target motion in 4-dimensional radiotherapy are being world-widely conducted to enhance treatment record and protection of normal organs. Prediction of tumor motion might be very useful and/or essential for especially free-breathing system during radiation delivery such as respiratory gating system and tumor tracking system. Neural network is powerful to express a time series with nonlinearity because its prediction algorithm is not governed by statistic formula but finds a rule of data expression. This study intended to assess applicability of neural network method to predict tumor motion in 4-dimensional radiotherapy. Scaled Conjugate Gradient algorithm was employed as a learning algorithm. Considering reparation data for 10 patients, prediction by the neural network algorithms was compared with the measurement by the real-time position management (RPM) system. The results showed that the neural network algorithm has the excellent accuracy of maximum absolute error smaller than 3 mm, except for the cases in which the maximum amplitude of respiration is over the range of respiration used in the learning process of neural network. It indicates the insufficient learning of the neural network for extrapolation. The problem could be solved by acquiring a full range of respiration before learning procedure. Further works are programmed to verify a feasibility of practical application for 4-dimensional treatment system, including prediction performance according to various system latency and irregular patterns of respiration.
Humans ; Learning ; Respiration ; Track and Field

In order to develop a Patient respiratory management system includinga biofeedback function for4-dimentional radiation therapy, this study investigated anoptimal tracking algorithmfor moving target using IR (Infra-red) camera as well as commercial camera. A tracking system was developed by LabVIEW 2010. Motion phantom images were acquired using a camera (IR or commercial). After image process were conducted to convert acquired image to binary image by applying a threshold values, several edge enhance methods such as Sobel, Prewitt, Differentiation, Sigma, Gradient, Roberts, were applied. The targetpattern was defined in the images, and acquired image from a moving targetwas tracked by matching pre-defined tracking pattern. During the matching of imagee, thecoordinateof tracking point was recorded. In order to assess the performance of tracking algorithm, the value of score which represents theaccuracy of pattern matching was defined. To compare the algorithm objectively, we repeat experiments 3 times for 5 minuts for each algorithm. Average valueand standard deviations (SD) of score were automatically calculatedsaved as ASCII format. Score of threshold only was 706, and standard deviation was 84. The value of average and SD for other algorithms which combined edge detection method and thresholdwere 794, 64 in Sobel, 770, 101 in Differentiation, 754, 85 in Gradient, 763, 75 in Prewitt, 777, 93 in Roberts, and 822, 62 in Sigma, respectively. According to score analysis, the most efficient tracking algorithm is the Sigma method. Therefore, 4-dimentional radiation threapy is expected tobemore efficient if threshold and Sigma edge detection method are used together in target tracking.
Biofeedback, Psychology ; Humans ; Track and Field

Second look US evaluation is frequently performed for assessing incidentally discovered enhancing lesions seen on MRI. However, the success of the examination depends on the experience and technique of the operator. Sonographic identification of an MRI incidentally detected lesion is difficult because the patient's body is positioned differently during sonography than it is during MRI. Fusion imaging of MRI and US has recently been developed, for which a position tracking system is coordinated with a magnetic sensor. This system synchronizes an ultrasound image and the MR image with multi-planar reconstruction (MPR) of the same area in real time. The purpose of this study was to evaluate the usefulness of fusion imaging of MR and US for evaluating breast lesions.
Breast ; Magnetics ; Magnets ; Track and Field

To understand the function of edges in perception of moving objects, we defined four questions to answer. Is the focus point in visual motion detection of a moving object: (1) the body or the edge of the object, (2) the leading edge or trailing edge of the object, (3) different in scotopic, mesopic and photopic luminance levels, or (4) different for colored objects? We measured the Optomotor Response (OMR) and Edge Triggering Response (ETR) of goldfish. We used a square and sine wave patterns with black and red stripes and a square wave pattern with black and grey stripes to generate OMR's and ETR's in the goldfish. When we used black and red stripes, the black leading edges stimulated an ETR under scotopic conditions, red leading edges stimulated an ETR under photopic conditions, and both black and red leading edges stimulated an ETR under mesopic luminance levels. For black and gray stripes, only black leading edges stimulated an ETR in all three light illumination levels. We observed less OMR and ETR results using the sine wave pattern compared to using the square wave pattern. From these results, we deduced that the goldfish tend to prefer tracking the leading edge of the pattern. The goldfish can also detect the color of the moving pattern under photopic luminance conditions. We decided that ETR is an intriguing factor in OMR, and is suitable as a method of behavioral measurement in visual system research.
Goldfish ; Light ; Lighting ; Track and Field

We measured the dose distribution for spinal cord and tumor using Gafchromic film, applying 3D and 4D-Treatment Planning for lung tumor within the phantom. A measured dose distribution was compared with a calculated dose distribution generated from 3D radiation treatment planning and 4D radiation treatment planning system. The agreement of the dose distribution in tumor for 3D and 4D treatment planning was 90.6%, 97.64% using gamma index computed for a distance to agreement of 1 mm and a dose difference of 3%. However, a gamma agreement index of 3% dose difference tolerence of and 2 mm distance to agreement, the accordance of the dose distribution around cord for 3D and 4D radiation treatment planning was 57.13%, 90.4%. There are significant differences between a calculated dose and a measured dose for 3D radiation treatment planning, no significant differences for 4D treatment planning. The results provide the effectiveness of the 4D treatment planning as compared to 3D. We suggest that the 4-dimensional treatment planning should be considered in the case where such equipments as Cyberknife with the real time tracking system are used to treat the tumors in the moving organ.
Lung ; Radiosurgery ; Spinal Cord ; Track and Field

Fibroepithelial polyps (FEPs) on the vulvovaginal region are rare lesions of the lower genital track and differential diagnosis can be wide. When faced with FEPs, gynecologists and pathologists have to consider a wide range of diagnoses, because overlapping morphologic features and management of these lesions has been observed. We report a case of fibroepithelial polyps that developed on an unusual genital site, and provide a brief review of the literature.
Diagnosis, Differential ; Polyps ; Polytetrafluoroethylene ; Track and Field

PURPOSE: Surgical intervention into the maxillary posterior area can lead to inadvertent communication with the maxillary sinus. Spontaneous healing of 1 to 2 mm openings can occur. However, in patients with larger oro-antral communications and those with a history of sinus disease, surgical closure is often indicated. MATERIALS AND METHODS: In this case, a modified free gingival graft technique was used. The oro-antral sinus track after extraction was about 2x4 mm. But the patient had a history of Caldwell-Luc operation. Immediately after extraction, a modified free gingival graft was used for the closure of oro-antral sinus track. RESULT: A modified free gingival graft technique was successfully used for the closure of oro-antral sinus track. With this technique, esthetic results including similar colors, textures were achieved. CONCLUSION: It is thought that this technique is very useful in the closure of oro-antral sinus track.
Humans ; Maxillary Sinus ; Track and Field ; Transplants