Comparison of the new and the used imaging plates on computed radiography
- VernacularTitle:计算机X射线摄影新旧成像板的比较
- Author:
Wenhong DING
;
Weimin ZHANG
;
Jiawei WANG
- Publication Type:Journal Article
- Keywords:
Computed radiography;
Imaging plate;
Quality control;
Threshold contrast-detail detectability
- From:
Chinese Journal of Radiological Medicine and Protection
2008;28(3):286-288
- CountryChina
- Language:Chinese
-
Abstract:
Objective To compare image quality and radiation dose of the new imaging plate (IP) with the used IP on computed radiography (CR),and to investigate the using principle in the two kinds of IP. Methods The dark noise, uniformity and erasure thoroughness of the new and the used IP were measured respectively.Based on threshold contrast-detail detectability(TCCD) technique,the phantom T0.16 photography was done at 75 kV,and with the two kinds of IP respectively.Three observers scored each image sequence using double blind method,calculated the threshold detection index (HT).The volunteers were randomly divided into three groups:the knee joint group,the chest group and the lumbar group.Each group had 50 cases and checked with the same condition as the phantom.Three radiologists using double blind method evaluated the imaging quality of knee joint,chest and lumbar.Results The physical characteristic indexes of the new and the used IP were similar to each other.Under the same condition,the detection ability of the new IP was better than that of the used one.When the dose of exposure was raised about 20%,the detection ability of the used IP was close to that of the new one.Conclusions The dose of exposure can be raised to keep the same imaging quality with the increase times of IP used.The detection ability of IP can decrease with the same dose as before,and the image quality decreases too.
