Optimization the Reduced-Dose Abdominal CT Parameters Via Taguchi Methodology

• Main Authors: LAI,KUAN-MING, 賴冠鳴
• Other Authors: PAN,LUNG-KWANG
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/run6ma

碩士 === 中臺科技大學 === 醫學影像暨放射科學系暨研究所 === 107 === The imaging quality of Reduced-Dose abdominal CT was optimized via Taguchi analysis and an indigenous line group gauge in this study. The reduced-dose CT is an innovated technique in late 2010. It provided a precise image profile without letting patients undergone high dose exposure. However, the preset factor of the CT was still challenged for its potential application in diagnosing the tiny artifact. Thus, a robust designation was proposed herein to optimize the imaging quality of line group gauge inside the phantom’s kidney according to the Taguchi’s L18 recommendation. The Taguchi orthogonal array was gained its reputation in shortening the experimental repetition trials. Five factors of reduced-dose CT defined as (A) kernel, (B) kVp, (C) mAs, (D) slice thickness, and (E) pitch was organized into only eighteen groups for the optimized analysis according to Taguchi’s unique arrangement, In doing so, every factor had either two or three levels to preset, therefore a total of 162 ((2×3×3×3×3=162) combinations were actually considered in this study. the line group gauge was specially customized to fulfill the practical needs in kidney CT diagnosis. The CT scanned images were ranked by three well-trained radiologists on the basis of double-blinded criteria to evaluate the contribution of every factor according to their ranked average, standard deviation and signal to noise ratio, S/N, which was also defined by Taguchi. The optimal recommendation of reduced-dose CT was later confirmed as (A) Bone B60f sharp kernel, (B) 120 kVp, (C) 120 mAs, (D) 7 mm slice thickness, and (E) 1.5 pitch from fish-bone-plot of acquired data, and the followed survey proved the dominant factors were kernel as well as kVp from the ANOVA test.