|
KMID : 1151820160100080597
|
|
Journal of the Korean Society of Radiology
2016 Volume.10 No. 8 p.597 ~ p.602
|
|
|
The Study of Affecting Image Quality according to forward Scattering Dose used Additional Filter in Diagnostic Imaging System
|
|
Choi Il-Hong
Kim Kyo-Tae
Heo Ye-Ji
Park Hyong-Hu
Kang Sang-Sik
Noh Si-Cheol
Park Ji-Koon
|
|
|
Abstract
|
|
|
|
Recent clinical field utilizes the aluminium filter in order to reduce the low-energy photons. However, the usage of the filter can cause adverse effect on the image quality because of the scattered dose that is generated by X-ray hardening phenomenon. Further, usage of filter with improper thickness can be a reason of dose creep phenomenon where unnecessary exposure is generated towards the patient. In this study, the author evaluated the RMS and the RSD analysis in order to have a quantitative evaluation for the effect of forward scattering dose by the filter on the image. as a result of the study, the FSR and the RSD was increased together with the increasing of thickness of the filter. In this study the RSD means the standard deviation of the mean value is relatively size. It can be understood that the signal-to-noise ratio decreases when the average value is taken as a signal and the standard deviation is judged as a noise. The signal-to-noise ratio can understanding as index of resolution at image. Based on these findings, it was quantitatively verified that there is a correlation of the image quality with the FSR by using an additional filter. The results, a 2.5 mmAl which is as recommended by NCRP in the tube voltage of 70 kVp or more showed the 14.6% on the RSD when the filter was not in used. these results are considered able to be utilized as basic data for the study about the filter to improve the quality of the image.
|
|
|
KEYWORD
|
|
|
Diagnostic imaging system, Aluminum filter, ANSI Phantom, Forward Scattering Dose, Root Mean Square
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|