Improvement of DoseLab software program for CT image noise measurement and its application(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2021年第3期
- Page:
- 327-330
- Research Field:
- 医学影像物理
- Publishing date:
Info
- Title:
- Improvement of DoseLab software program for CT image noise measurement and its application
- Author(s):
- SHI Feiyue1; 2; WANG Min1; QIN Wei1; ZHAO Huanyu1; WEI Xiaowei1
- 1. Radiation Therapy Center, Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, China 2. Medical Physics Research Center, Nanjing Medical University, Nanjing 210029, China
- Keywords:
- Keywords: image noise program improvement CT simulator water phantom Catphan phantom
- PACS:
- R318
- DOI:
- DOI:10.3969/j.issn.1005-202X.2021.03.011
- Abstract:
- Abstract: Objective To improve DoseLab software program by adding the function of CT image noise measurement, and to perform a test analysis on the improved DoseLab program. Methods Firstly, the vertex coordinates of the regular 32-sided polygon were obtained by the vertex formula of inscribed regular polygon of a circle. Then, a regular 32-sided polygon region of interest (ROI) used for CT image noise detection was added in the image analysis program of DoseLab software for the CTP486 module of Catphan 504 phantom. The CT images of the water phantom of two slices (S3 and S4) which were obtained by the daily quality check (DQC) program of Siemens CT simulator every month in 2018 were selected to test the improved DoseLab program. The CT image noise data obtained from the improved DoseLab program and DQC program were analyzed and compared. Results According to the vertex coordinates of regular 32-sided polygon in a circle with a radius of 4 cm, the area of the polygon ROI was 49.94 cm2. Difference in image noise (ΔN) between improved DoseLab program and DQC program were calculated, and the results showed that the ΔN for S3 and S4 was (0.06±0.07) HU and (0.03±0.09) HU under the voltage of 120 kV, and that the corresponding ΔN was (0.10±0.09) HU and (0.08±0.09) HU under the voltage of 140 kV. Conclusion The improved DoseLab program with the addition of a regular 32-sided polygon ROI can be used to analyze water phantom and Catphan phantom automatically, thus obtaining CT image noise data.
Last Update: 2021-03-30