|
KMID : 0357520170400030393
|
|
Journal of Radiological Science and Technology
2017 Volume.40 No. 3 p.393 ~ p.400
|
|
|
Dose Reduction According to the Exposure Condition in Intervention Procedure : Focus on the Change of Dose Area and Image Quality
|
|
Hwang Jun-Ho
Jung Ji-Min
Kim Hyun-Soo
Kang Byung-Sam
Lee Kyung-Bae
|
|
|
Abstract
|
|
|
The purpose of this study is to suggest a method to reduce the dose by Analyzing the dose area product (DAP) and image quality according to the change of tube current using NEMA Phantom. The spatial resolution and low contrast resolution were used as evaluation criteria in addition to signal to noise ratio (SNR) and contrast to noise ratio (CNR), which are important image quality parameters of intervention. Tube voltage was fixed at 80 kVp and the amount of tube current was changed to 20, 30, 40, and 50 mAs, and the dose area product and image quality were compared and analyzed. As a result, the dose area product increased from 1066 mGycm2 to 6160 mGycm2 to 6 times as the condition increased, while
the spatial resolution and low contrast resolution were higher than 20 mAs and 30 mAs, Spatial resolution and low contrast resolution were observed below the evaluation criteria. In addition, the SNR and CNR increased up to 30 mAs, slightly increased at 40 mAs, but not significantly different from the previous one, and decreased at 50 mAs. As a result, the exposure dose significantly increased due to overexposure of the test conditions and the image quality deteriorated in all areas of spatial resolution, low contrast resolution, SNR and CNR.
|
|
|
KEYWORD
|
|
|
NEMA Phantom , Intervention , Quality Control , Dose Area Product , Image Quality , Exposure Dose
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|