Radiation Dose Reduction in Cervical Spine Computed Tomography in Cervical Spine Trauma: Comparison of Low-dose with Standard-dose Multidetector Computed Tomography

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KY Man, KM Mo, HT Sung, KY Cho, CW Tam

Hong Kong J Radiol 2019;22:180-7


Objective: To evaluate radiation dose reduction, and any effect on image quality, in low-dose cervical spine multidetector computed tomography (MDCT) in patients with cervical spine trauma.
Methods: A total of 54 consecutive patients from July 2016 to May 2017 underwent cervical spine MDCT: a standard-dose group (group A, n = 18, pitch = 0.641), a low-dose group with an increased pitch (group B, n = 18, pitch = 0.828), and a low-dose group with an increased pitch and low-dose auto mA quality factor (group C, n = 18, pitch = 0.828, quality factor standard deviation 15). Radiation dosimetry was recorded and image quality was assessed by evaluation of image noise, signal-to-noise ratio, and contrast-to-noise ratio in bone algorithm images, and by subjective assessment by two independent radiologists.
Results: The mean volume CT dose indices were 70.7 mGy, 48.3 mGy, and 32.6 mGy for groups A, B, and C, respectively. The mean dose-length products were 859.9 mGycm, 590.1 mGycm, and 453.9 mGycm for groups A, B, and C, respectively. These differences in mean volume CT dose indices and dose-length product were statistically significant among the three groups (post-hoc Tukey: both p < 0.001). There were no significant differences in image quality (analysis of variance/Kruskal-Wallis test: all p > 0.05) or subjective evaluation of image quality (Chi squared test: all p > 0.05) among the three examination groups.
Conclusion: Low-dose cervical spine MDCT in patients with cervical spine trauma resulted in a substantial 47.2% to 53.9% dose reduction, compared with standard-dose MDCT.


Author affiliation(s):
KY Man, KM Mo, HT Sung, KY Cho, CW Tam: Department of Radiology, Pamela Youde Nethersole Eastern Hospital, Chai Wan, Hong Kong







結果:三組的平均容積CT劑量指數分別為:A組70.7 mGy、B組48.3 mGy、C組32.6 mGy,差異顯著(p < 0.001)。三組的圖像質量相比均沒有顯著差異。