We developed a digital radiography (DR) system using a new amorphous selenium (a-Se) based direct-detection flatpanel
detector which has a pixel pitch of 0.168mm, a fill factor of 83%, and a total active imaging area is 17"×17". Our
new system consists of an X-ray generator, two flat-panel detectors, an X-ray tube, a bucky stand, a bucky table, a
control box, an image processing unit and another component. The performance of this imaging system has been
measured and compared with that of our previous system used an a-Se based flat-panel detector, however, which has a
pixel pitch of 0.139mm, a fill factor of 82% and a total active imaging area of 14"×17". In order to evaluate the system
performance quantitatively, the modulation transfer function (MTF), detective quantum efficiency (DQE) and noise
power spectrum (NPS) were measured. At 3.0 lp./mm, the measured MTF was 56%, and DQE were 25% approximately
for a new flat-panel detector. In case of the previously used flat-panel detector, the MTF and DQE at 3.0 lp./mm were
75% and 12%, respectively. The MTF of a new flat-panel detector was lower than that of a previous detector, however
DQE of a new detector was higher than that of a previous detector at whole spatial frequency region. In conclusion, our
new DR system is capable of providing good image quality in aspect of the physical characteristics although the MTF is
relatively lower than previously developed system.
KEYWORDS: Standards development, Medicine, Data modeling, System integration, Systems modeling, Databases, Therapeutics, Medical research, Picture Archiving and Communication System, Analytical research
Many countries have set long-term objectives for establishing an Electronic Healthcare Records system(EHRs). Various
IT Strategies note that integration of EHR systems has a high priority. Because the EHR systems are based on different
information models and different technology platforms, one of the key integration problems in the realization of the
EHRs for the continuity of patient care, is the inability to share patient records between various institutions. Integrating
the Healthcare Enterprise (IHE) committee has defined the detailed implementations of existing standards such as
DICOM, HL7, in a publicly available document called the IHE technical framework (IHE-TF). Cross-enterprise
document sharing (XDS), one of IHE technical frameworks, is describing how to apply the standards into the
information systems for the sharing of medical documents among hospitals. This study aims to design Clinical Document
Architecture (CDA) schema based on HL7, and to apply implementation strategies of XDS using this CDA schema.
KEYWORDS: Personal digital assistants, Databases, Image compression, Picture Archiving and Communication System, Telecommunications, Internet, Visualization, Imaging systems, Mobile communications, Information fusion
The wireless mobile service with a high bit rate using CDMA-1X EVDO is now widely used in Korea. Mobile devices
are also increasingly being used as the conventional communication mechanism. We have developed a web-based
mobile system that communicates patient information and images, using CDMA-1X EVDO for emergency diagnosis. It
is composed of a Mobile web application system using the Microsoft Windows 2003 server and an internet information
service. Also, a mobile web PACS used for a database managing patient information and images was developed by
using Microsoft access 2003. A wireless mobile emergency patient information and imaging communication system is
developed by using Microsoft Visual Studio.NET, and JPEG 2000 ActiveX control for PDA phone was developed by
using the Microsoft Embedded Visual C++. Also, the CDMA-1X EVDO is used for connections between mobile web
servers and the PDA phone. This system allows fast access to the patient information database, storing both medical
images and patient information anytime and anywhere. Especially, images were compressed into a JPEG2000 format
and transmitted from a mobile web PACS inside the hospital to the radiologist using a PDA phone located outside the
hospital. Also, this system shows radiological images as well as physiological signal data, including blood pressure,
vital signs and so on, in the web browser of the PDA phone so radiologists can diagnose more effectively. Also, we
acquired good results using an RW-6100 PDA phone used in the university hospital system of the Sinchon Severance
Hospital in Korea.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.