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| Feasibility of personalized ultra-low-dose scan in pediatric chest CT by 70 kV combined with#br#
ASiR-V iterative reconstruction in wide-coverage volume scan |
| DING Jie, HE Wei-heng, YANG Li-li, CAO Yong-pei, WANG Ze-run, GAO Yong-bin, HA Ruo-shui |
Medical Imaging Center, Ningxia Hui Autonomous Region People’s Hospital
(North University of Nationalities Teaching Hospital), Yinchuan 750002, China |
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Abstract Objective: To explore the feasibility of personalized ultra-low-dose scan in pediatric chest CT by 70 kV combined with ASiR-V iterative reconstruction in wide-coverage volume scan. Methods: 138 pediatric patients were enrolled and separated into four groups according to the scan length of patients: group 1(8 cm): 57 cases; group 2(12 cm): 32 cases; group 3(14 cm): 26 cases; group 4(16 cm): 23 cases. All the patients underwent chest scans with one rotation wide-coverage volumes scan, the tube voltage was 70 kV, ASiR-V 60% iterative reconstruction was adopted. The image quality was evaluated by two radiologists using 5-point scores, when their scores were inconsistent, the averaged score was taken. CTDIvol and DLP were recorded, image attenuation and noise were measured, signal-to-noise(SNR) and effective radiation dose(ED) were calculated. Results: The subjective image quality scores had good consistency(Kappa=0.703, P=0.118). The image quality scores of the four groups were (4.50±0.51), (4.67±0.58), (4.38±0.66) and (4.50±0.58). The SD was (14.62±1.46) HU, (14.31±3.57) HU, (14.78±2.13) HU, (14.46±1.49) HU. The SNR was (3.21±0.60), (3.96±0.59), (2.98±0.71) and (3.26±0.61). The CTDIvol was (0.71±0.11) mGy, (0.74±0.06) mGy, (0.80±0.07) mGy and (0.86±0.04) mGy. The DLP was (5.89±0.79) mGy·cm, (7.88±0.92) mGy·cm, (10.70±1.02) mGy·cm and (11.72±0.97) mGy·cm. The ED was (0.23±0.03) mSv, (0.24±0.03) mSv, (0.26±0.05) mSv and (0.21±0.02) mSv. Conclusion: The ultra-low-dose scanning with one rotation scan, 70 kV and ASiR-V iterative reconstruction provide good image quality for diagnosis of pneumonia in pediatric chest CT.
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Received: 13 September 2017
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