BACKGROUND: Virtual environments have brought the use of realistic training closer to many different fields of education. In medical education, several visualization methods for studying inside the human body have been introduced as a way to verify the structure of internal organs. However, these methods are insufficient for realistic training simulators because they do not provide photorealistic scenes or offer an intuitive perception to the user. In addition, they are used in limited environments within a classroom setting.METHODS: We have developed a virtual dissection exploration system that provides realistic three-dimensional images and a virtual endoscopic experience. This system enables the user to manipulate a virtual camera through a human organ, using gesture-sensing technology. We can make a virtual dissection image of the human body using a virtual dissection simulator and then navigate inside an organ using a virtual endoscope. To improve the navigation performance during virtual endoscopy, our system warns the user about any potential collisions that may occur against the organ's wall by taking the virtual control sphere at the virtual camera position into consideration.RESULTS: Experimental results show that our system efficiently provides high-quality anatomical visualization. We can simulate anatomic training using virtual dissection and endoscopic images.CONCLUSION: Our training simulator would be helpful in training medical students because it provides an immersive environment.

BACKGROUND: Virtual environments have brought the use of realistic training closer to many different fields of education. In medical education, several visualization methods for studying inside the human body have been introduced as a way to verify the structure of internal organs. However, these methods are insufficient for realistic training simulators because they do not provide photorealistic scenes or offer an intuitive perception to the user. In addition, they are used in limited environments within a classroom setting. METHODS: We have developed a virtual dissection exploration system that provides realistic three-dimensional images and a virtual endoscopic experience. This system enables the user to manipulate a virtual camera through a human organ, using gesture-sensing technology. We can make a virtual dissection image of the human body using a virtual dissection simulator and then navigate inside an organ using a virtual endoscope. To improve the navigation performance during virtual endoscopy, our system warns the user about any potential collisions that may occur against the organ's wall by taking the virtual control sphere at the virtual camera position into consideration. RESULTS: Experimental results show that our system efficiently provides high-quality anatomical visualization. We can simulate anatomic training using virtual dissection and endoscopic images. CONCLUSION Our training simulator would be helpful in training medical students because it provides an immersive environment.

OBJECTIVE: The purpose of this research was to investigate the differences of symptoms and neurocognitive functions with good and poor social functioning schizophrenic outpatients. METHOD: 152 schizophrenic outpatients were divided to good social functioning group(n=26) and poor social functioning group(n=126) based on the instrumental role of workers or students. Neurocognitive functions of these patient groups were compared with normal control group, which was composed of 30 healthy persons without a history of psychiatric illness. Schizophrenic symptoms were assessed by the Positive and Negative Syndrome Scale(PANSS). Neurocognitive function tests include the sustained attention, sensory register, executive function, concentration and attention, and verbal memory and learning assessed with Degraded Stimulus Continuous Performance Test(DS-CPT), Span Apprehension Task(SAT), Wisconsin Card Sorting Test(WCST), Digit Span(DS), and Rey Auditory Verbal Learning Test(RAVLT). RESULTS: 1) No significant differences were noted in the symptom subtypes of PANSS between good and poor social functioning patient groups. 2) The poor social functioning patient group showed significant deficits in the sustained attention, sensory register, concentration and attention, and verbal memory and learning as manifested in the data of DS-CPT, SAT, DS, and RAVLT compared with normal control and good social functioning patient groups. But there were no differences in these neurocognitive functions between good social functioning patient group and normal control group. CONCLUSIONS: These results suggested that some neurocognitive deficits such as sustained attention, sensory register, concentration and attention, and verbal memory and learning may be more important factors than symptoms for social functioning in the stable schizophrenic outpatients.
Executive Function ; Humans ; Learning ; Memory ; Outpatients ; Schizophrenia ; Verbal Learning ; Wisconsin

The thousands of serial images used for medical pedagogy cannot be included in a printed book; they also cannot be efficiently handled by ordinary image viewer software. The purpose of this study was to provide browsing software to grasp serial medical images efficiently. The primary function of the newly programmed software was to select images using 3 types of interfaces: buttons or a horizontal scroll bar, a vertical scroll bar, and a checkbox. The secondary function was to show the names of the structures that had been outlined on the images. To confirm the functions of the software, 3 different types of image data of cadavers (sectioned and outlined images, volume models of the stomach, and photos of the dissected knees) were inputted. The browsing software was downloadable for free from the homepage (anatomy.co.kr) and available off-line. The data sets provided could be replaced by any developers for their educational achievements. We anticipate that the software will contribute to medical education by allowing users to browse a variety of images.
Body Image ; Cadaver ; Dataset ; Education, Medical ; Educational Status ; Hand Strength ; Learning* ; Stomach ; Teaching ; Visible Human Projects

A 16-year-old Korean male patient presented with macrodactyly, hemihypertrophy of the face and extremities, plantar cerebriform hyperplasia, a subcutaneous mass of the left chest, macrocephaly and verrucous epidermal nevi. These findings are consistent with Proteus Syndrome. The clinical features, etiology, management, natural course and differential diagnosis of this case are discussed.
Adolescent ; Case Report ; Disease Progression ; Human ; Male ; Proteus Syndrome/diagnosis/etiology/*physiopathology/therapy

In this article, the sixth author's affiliation was misprinted unintentionally.

To be helpful in medical education, anatomical images were made by serial sectioning of the Korean cadaver's whole body at 0.2 mm intervals. Successively, segmented images were made by outline drawing of thirteen anatomical structures on the anatomical images. First purpose of this research is to verify that anatomical and segmented images are correct by means of the virtual dissection of 3D (three dimensional) images, which are made of the anatomical and segmented images. Second purpose is to verify that the virtual dissection is helpful in studying anatomy. A 3D anatomical image and a 3D segmented image were made by stacking the anatomical and segmented images and subsequently by volume reconstructing after both intervals and pixel size of the anatomical and segmented images were reduced to be 1 mm. Virtual dissection software, on which the 3D anatomical and 3D segmented images could be sectioned at free angles, and the 3D anatomical images of the several anatomical structures could be selected to display referring to the 3D segmented image and could be rotated at the free angles, was made. As the result of this research, corresponding 3D anatomical and 3D segmented images (resolution 494x282x1,702) were prepared; and virtual dissection software, which could be conveniently operated on the personal computer, was prepared. On the virtual dissection software, stereoscopic shape and location of the anatomical structures were corresponding to anatomical knowledge, so that the anatomical and segmented images were verified to be correct. The virtual dissection software was verified to be helpful in studying stereoscopic shape and location of the anatomical structures. If the anatomical images, segmented images, 3D images, and virtual dissection software made in this research are distributed worldwide, they will help not only medical students and doctors study anatomy but also other researchers make better segmented images, 3D images, and virtual dissection software.
Education, Medical ; Humans ; Microcomputers ; Students, Medical

It is well known that the inflammation of somatic tissues, bladder and colon can alter the sensitivity of primary afferents innervating these tissues. To see if uterine afferents also show altered sensitivity, we examined their responses to the algesic agent bradykinin before and after induction of uterine inflammation. Inflammation was induced by injecting the mustard oil into the uterine lumen of adult female rats. After induction of inflammation, the response latency to bradykinin did not change, but the duration and peak of the response and integrated impulse discharges during the response period increased significantly. Furthermore, after inflammation, the level of resting discharges of the afferents was much higher. These results are consistent with the idea that the inflammation can sensitize the uterine afferents.
Adult ; Animals ; Bradykinin* ; Colon ; Female ; Humans ; Inflammation* ; Mustard Plant* ; Nerve Fibers* ; Rats* ; Reaction Time ; Urinary Bladder ; Uterus

We intended to determine that virtual endoscopy and laparoscopy of the stomach based on serially sectioned cadaver images is beneficial. Therefore, the outlines between the gastric wall and lumen were traced using the new female data of the Visible Korean to build a volume model. While the outlines were expanded at appropriate thicknesses, the stomach was observed endoscopically and laparoscopically in comparison with a chosen sectioned image. Four layers (mucosa, submucosa, muscular layer, and serosa) of the stomach were discernible by their proper colors in the sectioned images. All layers except the submucosa were identified in the endoscopic and laparoscopic views by using consistent colors. The stepwise expansion of the outlines revealed thickness of each layer as well as whether the thickness was uniform. Our ideas and the Visible Korean images could be a robust resource of virtual reality learning for medical students and clinicians.
Adult ; Cadaver ; Female ; *Gastroscopy ; Humans ; Imaging, Three-Dimensional ; *Laparoscopy ; Models, Anatomic ; Stomach/*pathology

While it is reasonably well known that certain dental procedures increase the temperature of the tooth's surface, of greater interest is their potential damaging effect on the pulp and tooth-supporting tissues. Previous studies have investigated the responses of the pulp, periodontal ligament, and alveolar bone to thermal irritation and the temperature at which thermal damage is initiated. There are also many in vitro studies that have measured the temperature increase of the pulp and tooth-supporting tissues during restorative and endodontic procedures. This review article provides an overview of studies measuring temperature increases in tooth structures during several restorative and endodontic procedures, and proposes clinical guidelines for reducing potential thermal hazards to the pulp and supporting tissues.
Periodontal Ligament ; Root Canal Obturation ; Tooth ; Tooth Preparation ; Ultrasonics