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KMID : 0357520170400030385
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Journal of Radiological Science and Technology
2017 Volume.40 No. 3 p.385 ~ p.392
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Quality of Image and Exposure Dose According to kVp, mA and Iterative Reconstruction in Computed Tomography
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Cha Sang-Young
Park Jae-Yoon
Lee Yong-Ki
Kim Jung-Hoon
Choi Jae-Ho
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Abstract
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The purpose of this study is to investigate the image quality and exposure dose according to kVp and mAs in CT and to confirm improvement in image quality according to None IR and IR(Iterative Reconstruction) levels. Measurement results of image quality using Image J, HU(Hounsfield units) and BN(Background Noise) are decreased, while SNR(Signal to Noise Ratio) and CTDIvol(CT dose index volume) are increased as the kVp increases and there was no change of BHU(Background Hounsfield units). BN was reduced due to increased kVp, while SNR and CTDIvol were increased. Also, the higher IR stage, the lower BN, SI(Signal Intensity) and HU while SNR was improved by about 10∼60%. Based on this, when applying IR for clinical applications, it is necessary to finely adjust kVp and mA with a phased approach.
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KEYWORD
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Computed Tomography , Signal to Noise Ratio , Iterative Reconstruction , Exposure Dose , Tube Voltage , Tube Current
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