The tube current modulation base on time bolus peak in low voltage:a clinical study
10.3969/j.issn.1002-1671.2015.08.032
- VernacularTitle:循环测试峰值调制管电流在低管电压CTPA 中的临床应用
- Author:
Lei ZHAO
;
Lili BAO
;
Zefeng WANG
;
Aishi LIU
- Publication Type:Journal Article
- Keywords:
computed tomography;
pulmonary artery;
image quality;
radiation dose
- From:
Journal of Practical Radiology
2015;(8):1354-1357
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the image quality and obtained by the tube current modulation base on time bolus peak in low voltage in CTPA.Methods 30 consecutive patients suspected pulmonary embolism(PE)were prospectively enrolled,and satisfy the following conditions.The study was performed by 64-slice spiral CT system (lightspeed VCT-XT,GE healthcare),Tube voltage was set at 80 kV.Tube current settings related to the attenuation of ROIs by test bolus peak.The injection parameters were set up by injection flow rate (4 mL/s),contrast medium dose (28 mL),and saline flushing dose (40 mL).All images were evaluated by two observers blinded to pulmonary CTA protocol,including attenuation,noise,SNR and CNR.The image quality was evaluate by 4-score.To evaluate the relationship between influential factor and image quality using Pearson correlation analysis.A P-value <0.05 was considered to indicate a statistically significant difference.Results The time bolus peak was statistically significant influence on attenuation(r=0.398,P =0.029).There was no statistically significant influence on noise (r=0.104,P =0.583),signal-to-noise ra-tio (r=0.263,P =0.1 60)and contrast-to-noise ratio(r=0.299,P =0.109).The other factors(BM,BMI and BSA)was no statisti-cally significant influence on the image quality(P > 0.05 ).The mean attenuation,noise,SNR and CNR on pulmonary trunk was (628.63±146.46)HU,(53.92±14.07)HU,12.02±3.1 7 and 10.81±3.10,respectively.The percentage of assessable pulmonary arteries was 95.82%.Conclusion The tube current modulation base on time bolus peak in low voltage could offer assessable image quality and raise image stability.
