| Objective Explore the quality control of CT values when using thin layer CT scanning for the diagnosis of osteoporosis. Osteoporosis can lead to bone loss and higher risk of fracture. There are several kinds of methods on its diagnosis. At present, some scholars put forward the method of using thin-layer CT scanning for the diagnosis of osteoporosis, but there have been no reports on the quality control of this method. Methods Nine pieces of pig femur were scanned on two CT scanners. The control factors were: Voltage: 100kV and 120kV; Electric current: 150mAs and 328mAs. According to bone and soft tissue algorithm and standard algorithm output of the data, the results were transmitted to a personal workstation. Through the Mask editor, the data were divided into single and multiple bone comparison groups. Statistical analyses performed include (1) t-test; (2) and Vσ change range; (3) One-way ANOVA; (4) Chi-Square Test; (5) Geometric verification. Results (1) Comparing the SBCG results obtained on the two CT scanners using t-test, GE CT had 523/597 P<0.05, and SIEMENS CT had 547/594 P<0.05; (2) 's total change range was 0.0664± 0.0506, and Vσ's total change range was 0.0310± 0.0300; (3) Single factor analysis of variance on number of results with P<0.05, according to the correlation with the 4 factors, from large to small were: voltage>machine＝algorithm>current. (4) Chi-Square Test: vs. Vσ, P<0.01; 's KV factors vs. CT factors, P<0.01; 's KV factors vs. algorithm factors, P<0.01; 's CT factors vs algorithm factors, P>0.05; 's current factors vs other factors, P<0.01. (5) The standard deviation and the mean value of CT approximated to the geometric change. Conclusions In the diagnosis of osteoporosis based on thin-layer CT scanning, the standard deviation coefficient of the CT value of bone had very good quality control. |