Nosil J, Pearce K I, Stein R A
Department of Radiological Sciences and Diagnostic Imaging, Foothills Hospital, Calgary, Alberta, Canada.
Med Phys. 1989 Jan-Feb;16(1):110-3. doi: 10.1118/1.596396.
The aim of this paper is to present linearity studies and quality control charts for changes in the computed tomography (CT) number of water and contrast scales for two CT scanners over one year. Linear regression relates the attenuation coefficient to CT number. The CT number for water and the contrast scale values as obtained from the fit are: CT1 = (-0.13 +/- 1.3) Hounsfield units (HU), CT2 = (-1.8 +/- 1.6) HU and contrast scale (CS)1 = (1.80 +/- 0.03) 10(-4) cm-1 HU-1, CS2 = (1.82 +/- 0.02) 10(-4) cm-1 HU-1 for Picker International scanner models 600SE and 1200SX, respectively. Direct measurements of CT numbers are compared with fitted results, providing a necessary preliminary steps in the development of objective CT interpretation.
本文旨在展示两台CT扫描仪在一年时间里水的计算机断层扫描（CT）值和对比剂浓度变化的线性研究及质量控制图。线性回归将衰减系数与CT值相关联。通过拟合得到的水的CT值和对比剂浓度值分别为：Picker International 600SE型和1200SX型扫描仪，CT1 =（-0.13±1.3）亨氏单位（HU），CT2 =（-1.8±1.6）HU，对比剂浓度（CS）1 =（1.80±0.03）×10⁻⁴ cm⁻¹ HU⁻¹，CS2 =（1.82±0.02）×10⁻⁴ cm⁻¹ HU⁻¹。将CT值的直接测量结果与拟合结果进行比较，这是开发客观CT解释的必要初步步骤。
