|
KMID : 1001220070090010037
|
|
Journal of the Korean Society of Digital Medical Imaging Technology
2007 Volume.9 No. 1 p.37 ~ p.43
|
|
|
The Comparative Analysis of Exposure Conditions between F/S and C/R System for an Ideal Image in Simple Abdomen
|
|
Son Sang-Hyuk
Song Young-Geun
Kim Je-Bong
|
|
|
Abstract
|
|
|
1. Purpose
This study is to present effective exposure conditions to acquire the best image of simple abdomen in Film Screen (F.S) system and Computed Radiography (C.R) system.
2. Method
In the F.S system, while an exposure condition was fixed as 70kVp, images of a patients simple abdomen were taken under the different mAs exposure conditions. Among these images, the best one was chosen by radiologists and radiological technologists. In the C.R system, the best image of the same patient was acquired with the same method from the F.S system. Both characteristic curves from F.S system and C.R system were analyzed.
3. Results
In the F.S system, the best exposure condition of simple abdomen was 70kVp and 20mAs. In the CR system, with the fixed condition at 70kVp, the image densities of human organs, such as liver, kidney, spleen, psoas muscle, lumbar spine body and iliac crest. were almost same despite different environments (3.2mAs, 8mAs, 12mAs, 16mAs and 20mAs). However, when the exposure conditions were over or under (below) 12mAs, the images between the abdominal wall and the directly exposed part became blurred because the gap of density was decreased. In the C.R system, while the volume of mAs was decreased, an artifact of quantum mottle was increased.
4. Conclusion
This study shows that the exposure condition in the C.R system can be reduced 40% than in the F.S system. This paper concluded that when the exposure conditions are set in CR environment, after the analysis of equipment character, such as image processing system(EDR : Exposure Data Recognition processing), PACS and so on, the high quality of image with maximum information can be acquired with a minimum exposure dose.
|
|
|
KEYWORD
|
|
|
Film Screen (F.S) System, Computed Radiography (C.R) System, PACS, Characteristic Curves, Quantum Mottle, EDR (Exposure Data Recognition Processing)
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|
|
|