2016•Zhonghua fangshe yixue yu fanghu zazhiRequires access
Study of adult chest CT using care dose 4D combined with anteroposterior and lateral localizer radiographs
袁子龙, Yuan Zilong, 郑丽丽, Lili Zheng, 杜东屏, Du Dongping, 张照喜, Zhaoxi Zhang, 陈长春, Changchun Chen, 周俊芬, Junfen Zhou, 彭伟, Peng Wei, 刘玉林, Yulin Liu
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Abstract
Objective
To explore the application value and significance of anteroposterior and lateral localizer radiographs in reducing the radiation dose in adult chest CT with CARE Dose 4D technique.
Methods
Totally 120 patients undergoing chest CT scan were randomly divided into 2 groups (test group and control group, with 60 cases in each group) according to random nuber table. Anteroposterior and lateral localizer radiographs were performed for experimental group and anteroposterior localizer radiograph for control group, both being scanned with CARE Dose 4D technique. CTDIvol, DLP, image noise and subjective image quality in two groups were recorded and compared.
Results
Averages of CTDIvol and DLP were (5.11±0.87) and (159.58±30.65) mGy·cm in test group, and (6.56±1.74) and(211.5±65.89)mGy·cm in control group, respectively. Compared with control group, average CTDIvol decreased by 1.45 mGy (22.1%) and average DLP decreased by 51.92 mGy (24.5%) in test group, with statistically significant differences (t=-5.75, -5.88, P 0.05). Subjective image quality scores in two groups were consistent with the requirements of clinical diagnosis(χ2=1.37, P>0.05).
Conclusions
Adult chest CT scan with anteroposterior and lateral localizer radiographs using CARE Dose 4D technology can guarantee image quality while further reducing the radiation dose to patients.
Key words:
Tomography; X-ray computed; Chest; CARE Dose 4D; Radiation dose; Image quality