Accuracy and repeatability of Revolution CT energy spectrum imaging in measurement of bone mineral density of spine phantom
10.13929/j.issn.1672-8475.2020.07.011
- VernacularTitle: Revolution CT能谱成像测量腰椎体模骨密度的准确性及可重复性
- Author:
Xuan CUI
1
Author Information
1. Department of Medical Imaging, Weifang Medical University
- Publication Type:Journal Article
- Keywords:
Accuracy;
Bone mineral density;
Lumbar vertebra;
Reproducibility;
Tomography, X-ray computed
- From:
Chinese Journal of Interventional Imaging and Therapy
2020;17(7):430-433
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To observe the accuracy and repeatability of Revolution CT energy spectrum imaging for measuring bone mineral density (BMD) of lumbar vertebra phantom. Methods: Revolution CT was used with different tube current and different tube rotation speed combinations, a total of 20 sets of scanning conditions, and the European spine phantom (ESP) were scanned repeatedly for 10 times. The Hydroxyapatite (HAP) value of L1, L2, and L3 vertebral bodies were measured by energy spectral material decomposition technique, and the measured HAP values were compared with actual values. At the same time, the volume CT dose index (CTDIvol) of each scanning condition were recorded and compared. Then the repeatability of measurements with CT machines was observed. Results: Under 20 groups of conditions, the measured HAP values of L1, L2 and L3 intervertebral bodies were statistically significant (all P<0.001). With tube current 230 mA and tube rotating speed 0.8 s/rot or tube current 315 mA and tube rotating speed 1.0 s/rot, no significant difference was found between measured HAP values and the actual values of L1, L2 and L3 vertebral body, nor between measured HAP values obtained with 2 CT machines (all P>0.05), and CTDIvol was 9.09 mG and 15.46 mGy, respectively. Conclusion: Revolution CT scan is accurate in measuring BMD of ESP, especially with tube rotation speed 0.8 s/rot and tube current 230 mA, and the radiation dose is low. The repeatability between different CT machines of same model is good.
