Accuracy and repeatability of Revolution CT energy spectrum imaging in measurement of bone mineral density of spine phantom / 中国介入影像与治疗学

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 P0.05), 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.