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Standard와 MAR 알고리즘에서 CT 검사조건 변화에 따른 인공물과 노이즈 평가

Evaluation of Artifact and Noise in the Standard and MAR Algorithms with Variation of Examination Conditions of CT

방사선기술과학 2020년 43권 2호 p.79 ~ 85
김영근 ( Kim Young-Kuen ) - Gwangju Health University Department of Radiologic Technology

양숙 ( Yang Sook ) - Industrial Researcher of Cusmedi Co.
왕태욱 ( Wang Tae-Uk ) - Chonnam National University Hwasun Hospital Department of Radiology

Abstract


The influence of metal artifact in CT image depends on the type of metal materialsm, the reconstruction algorithm, and scan parameters. The presence of metal artifacts was quantitatively evaluated by applying the standard and MAR algorithms through the phantom study. In the change of tube voltage applied the standard algorithm, metal artifact decreased to 44.9% for 80 vs 120 kVp, 24% for 100 vs 120 kVp, while the image taken at 140 kVp increased the artifact by 19% compared to 120 kVp. When the tube current was increased from 100 to 300 mA, there was no significant difference in the CT value and noise. Black band and white strike artifacts occurred up to 65.9% in the adjacent ROI of the metal driver, whereas titanium screw produced lesser metal artifact than that of the metal driver. The combination of 120kVp or higher tube voltage-standard algorithm was effective in removing black band artifacts as well as white streak by high density materials. However, MAR reconstruction algorithm was useful in improving image quality under the environment of low kVp and high density materials, without increase of radiation exposure.

키워드

MAR과 Standard 알고리즘 ; 관전압 ; 관전류 ; 단면두께 ; 컴퓨터단층촬영 ; 금속 아티팩트
MAR and Standard algorithm ; kVp ; mA ; Slice thickness ; Computed Tomography(CT) ; Metal artifact
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