Influence of Slice Position on Image Noise for a SIEMENS CT Simulator
JIANG Zhiwei1a, HUO Xinying1b, SHI Feiyue1b,2, QIN Wei1b, LIN Qiang1a, QIN Hang1a
1. a. Department of Medical Equipment, b. Department of Oncology, Nanjing First Hospital, Nanjing Medical University, Nanjing
Jiangsu 210006, China; 2. Medical Physics Center, Nanjing Medical University, Nanjing Jiangsu 210029, China
Abstract：Objective To study influence of the slice position on image noise for SIEMENS CT simulator by analyzing the
experimental CT image data using the water phantom. Methods The daily quality check program for the SIEMENS Sensation Open
CT simulator was utilized for 10 measurements with a water phantom, and the CT images of 6 neighboring slices (S1-S6) were
obtained under two conditions of the nominal tube voltages of 120 kV and 140 kV, respectively. Then the values of image noise were
obtained by manual delineation with the region of interest. Statistical analysis and comparative study were conducted on the image
noise data for different slice positions. Results Under the case with the nominal tube voltages of 120 kV, the values of image noise
for the first to sixth slices were (10.73±0.05), (10.66±0.05), (10.58±0.09), (10.58±0.08), (10.72±0.06), and (10.88±0.06) HU,
respectively. Under the case with the nominal tube voltages of 140 kV, the corresponding values were (10.09±0.09), (10.02±0.04),
(9.90±0.07), (9.93±0.05), (10.1±0.09), (10.17±0.12) HU, respectively. Statistical analysis showed that overall there was
statistical difference in image noise at different slice positions. Conclusion The slice position has influence on the image noise of the
SIEMENS CT simulator. The values of image noise in the middle slice position are smaller than those in the two ends.
蒋志玮1a，霍新颖1b，时飞跃1b,2，秦伟1b，林强1a，秦航1a. 层面位置对西门子CT模拟机图像噪声的影响[J]. 中国医疗设备, 2020, 35(3): 64-66.
JIANG Zhiwei1a, HUO Xinying1b, SHI Feiyue1b,2, QIN Wei1b, LIN Qiang1a, QIN Hang1a. Influence of Slice Position on Image Noise for a SIEMENS CT Simulator. China Medical Devices, 2020, 35(3): 64-66.
