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Author: search.filters.author.Boontawan, Rodjarin

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    A mammography database and viewer system
    (2012-12-01)
    Suapang, Piyamas
    ;
    Thongyoun, Methinee
    ;
    Boontawan, Rodjarin
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    Chivaprecha, Sorawat
    A Mammography Database and Viewer System have collected and stored mammography images of Thai women, treated at the Radiology Department of Hospital in Rangsit, Pathumtani, Thailand, constructed a database using the digitized mammography images, and developed an image viewing system to display these digital mammograms. The images are stored with the high resolution Matrox Morphis (MOR/2VD/84*) frame grabber board. The digital mammography database is powered by MySQL and PHP. It also has a web-based search engine (with secure access) so that the information can be made accessible to all medical team members. The image viewing software, DICOM Viewer, is coded in Borland C++ Builder and is intended to help medical professionals view and retrieve large data sets in near real time. This have already digitized 200 cases (one case per patient, twenty to forty images per case). The system also have developed a MySQL-based image database, and a PHP-based web-search engine to retrieve cases that have masses (benign or malignant) or calcifications (benign or malignant). This database has been evaluated by medical professionals and the experimental results obtained so far are very promising (high image qualities, fast access time). The system are currently developing an image content-based retrieval function for the database system in order to provide improved search capability for the medical professionals. ©2012 IEEE.
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    A web-based integrated medical information system for telepathology
    (2010-12-01)
    Jongsataporn, Thitaphan
    ;
    Yimmun, Surapun
    ;
    Suapang, Piyamas
    ;
    Boontawan, Rodjarin
    ;
    Dejhan, Kobchai
    The design and implementation of A Web-based Integrated Medical Information System for Telepathology which server was developed using software such as Borland C++ Builder 5.0, PHP and MySQL for image archive, image compression, image processing and image transmission. The system provides the following facilities: (1) DICOM-format image archive. (2) Medical Image Compression based on JPEG and JPEG2000. and (3) DICOM viewer. The results shown that (1) our system can also convert the image data both single frame and multiframe in normal or automatic DICOM process into the standard DICOM 3.0 format without altering the image data. (2) The resulting images are then compressed with two different techniques - JPEG and JPEG2000. The significant advantage of JPEG2000 over normal JPEG is that the error from JPEG2000 compression is smaller than the error from JPEG. Nevertheless, both methods share a similar mishap; when the compression ratio increases, they both generate more error than the processes on lower compression ratio. And (3) our system can open single frame and continuous frames, each of which can exhibit information in .dcm file format with no distortion and digital image processing based on local contrast enhancement, adaptive interpolators techniques and cine loop. The system has been developed and provided medical image services over long distance which showed the usefulness of our approach.
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    Sensorless speed control of DC servo motor using Kalman filter
    (2009-12-01)
    Praesomboon, Sukanya
    ;
    Athaphaisal, Santi
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    Yimman, Surapun
    ;
    Boontawan, Rodjarin
    ;
    Dejhan, Kobchai
    This research aims to study speed sensorless DC motor control using Kalman filter. Kalman filter considers the DC motor mathematical model. The model will start from a continuous state space into a discrete state space form. Inputs of the system are the armature voltage and the armature current with noises. The output of the system is the estimated speed. Kalman filter is used to estimate the speed without noise interference. The result from the estimated speed will be compared with the reference speed and the speed error will be used by the controller to control the linear amplifier. The final output is the constant speed of the DC motor. Even though the load of the DC motor changed the speed of the DC motor remains constant under the control. The experiment shows that Kalman filter can reject the noise from the system and can estimate the speed of the DC motor with a high accuracy. The estimated speed will be feedback to control the system for constant speed. ©2009 IEEE.