Z-DOM技术结合iDose4在儿童上颈段椎体CT扫描中的应用价值

doi:10.3969/j.issn.2095-9400.2019.08.010

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Abstract Objective: To investigate the application value of Z-DOM technique combined with iDose4 in reducing radiation dose in CT scan of the upper cervical vertebrae in children. Methods: A total of 55 child patients experiencing upper cervical vertebrae CT scan were selected as the experimental group, in which Z-DOM technique combined with iDose4 was used for low-dose scanning. Meanwhile, another 42 child patients receiving routine-dose CT scanning of the same site were selected as control group (not using Z-DOM technique combined with iDose4, 250 mAs). During the scanning, Volume CT dose index (CTDIvol) and Dose length product (DLP) of the two groups automatically displayed in the machine were respectively recorded, and the effective dose (ED) were calculated. The minimum and maximum values of mAs on the scanned image of each patient in the experimental group were also recorded. The image signal intensity, image noise, and background noise of each case were measured, and the signal noise ratio (SNR) was calculated. Results: The minimum mAs value of the experimental group was (45±11), and the maximum was (61±14), while the mAs values in the control group were all 250.0. Compared with the control group, the mAs values in the experimental group decreased by 234 mAs at maximum, with an average decline of 205 to 189 (75.6% to 82.0%). The CTDIvol, DLP, and ED of the experimental group were (3.7±1.1) mGy, (28.3±9.0) mGy•cm, and (0.3±0.1) mSv, respectively, while those in the control group were 169.0 mGy, (126.6±17.4) mGy•cm, and (1.4±0.2) mSv, respectively. The minimum mAs, the maximum mAs, the CTDIvol, the DLP and the ED were statistically different between the two groups. The intensity of the image signal, image noise, and background noise in the experimental group was (53.9±8.8), (7.1±1.8), and (8.5±1.4), respectively, while those in the control group were (57.2±5.8), (4.1±1.1), and (3.9±0.7), respectively. The SNR of the experimental group was (8.1±2.1) and that of the control group was (14.4±3.7). The intensity of image signal, image noise, background noise and SNR were statistically different between the experimental group and the control group. The image signal intensity and SNR of the experimental group were lower than those of the control group, while the image noise and background noise were higher. The diagnostic results of 28 cases of CT reexamination, 18 cases of MRI scans and 1 surgical case were consistent with those of the scan of the experimental group. Conclusion: With Z-DOM technology combined with iDose4, CT examination of the upper cervical vertebrae in children is of promising clinical appilcation value, as it enables real-time online adjustment of mAs and reduces the noise effectively, which cut down on radiation dose and ensures image quality.

Key words： children cervical vertebrae radiation dose tomography, X-ray computer

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	CHEN Jiuzun
	WU Aiqin
	ZHENG Wenlong

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https://xb.wmu.edu.cn/EN/10.3969/j.issn.2095-9400.2019.08.010 OR https://xb.wmu.edu.cn/EN/Y2019/V49/I8/599

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