Earticle

The purpose of this paper is to describe the transition of a 1,100 beds teritary hospital from 50% softcopy operation to full PACS operation. For the past 2 years, radiologists and clinicians have been using PACS to provide softcopy services to the outpatient clinics and inpatient wards of orthopedics surgery, neurosurgery and neurology as well as emergency room, surgical intensive care unit, medical intensive unit, pediatrics intensive care unit and neonatal intensive care unit. The examinations requested by these departments account for about 50% of hospitafs radiological exams. In September 1996, we began the second phase of PACS implementation and installed additional workstations (102) in the remaining wards and clinics, interfaced to PACS additional imaging modalites, and increased the capacity of both the image server (256 Gbytes) and optical juke boxes (3 Tbytes). As of January 1997, we are in the final phase of moving away from conventional film system to full PACS operation.

Before entering 21st Century, modern medical science is requiring more precise display which is highly estimated in diagnostic value as radial science technology is achieving sharp development. And it is also trying to contribute to improve national health and to offer better service by reducing radial exposure. General projection and Fluoroscopy which are most difficult to be displayed in digital tend to change their way : from analog to digital with development of Electronic Engineering and Computer Technology. Introducing to CR system in 1994, SMC have displayed General projection and Fluoroscopy 100% in digital using CR system. This study searched differences between repeat rate, repeat type in the exam using Film/Screen and those in the exam using CR system. According to the analysis of repeat types and repeat rate of Film which was reused by using CR system in general projection room and Fluoroscopy room of SMC, we found that total 192.813films were used and 2,097films. 1.09% of total were reused. However, actual repeat covers 0,76% to l,461sheets with the exception of 636sheets, As above, display process using CR system is 0.76% much lower than general repeat rate 2〜4% of Film/Screen exam. Besides decreased under/over exposure, it is appeared that position failure rate in repeat rate 0,76% covers relatively high 31%. Noticing that repeat caused 본 병원은 94년에 CR system을 도입하여 일반 촬영 및 투시 조영 검사의 100%를 CR system을 이용하여 디지 털 영상 처리하고 있다. 이번 연구에서는 Film/Screen 을 이용한 검사에서의 재촬영를(repeat rate), Repeat유 형과，CR system을 이용하여 검사 하였을때 달라지는 재촬영률의 변화 및 Repeat유형의 변화에 대하여 분석 하여 보기로 하였다. unskilled devices handing was found many times, suffiient understanding seems to be required to reduce repeat.

We tried to find any factor to reduce the exposure dose with ST-VA type generator which has the higher exposure dose. The guideline recommended by the provisions of IAEA regulation is being used at the time of radiation exposure and almost of those equipments used for this study had less amount of doses than those in the guideline. The FCR may be possible to decrease a certain amount of dose with effective applications of ifs automatic image compensation utillities and the verifying function in PACS. Next time, it is required to add a great number of hospitals for wide range of studies and measurements, and make standard exposure control table which will bing in practice, material decrease of dose volumes when radiation exposure.