The feasibility of dual-source CT using low voltage scan and iterative reconstruction combine with split-bolus injection to reduce radiation dose in urography

2017 
Objective To evaluate the image quality, diagnosis accuracy and dose reduction of split-bolus CT urography (CTU) with low voltage scan and sinogram affirmed iterative reconstruction (SAFIRE). Methods A total of 80 cases of consecutive patients with confirmed or suspected urinary system disease needed CTU examination were divided into two groups (control group and test group) by using random number table. In control group, convention scan (120 kV) with one time injection was used. But low voltage scan (80 kV) with SAFIRE algorithm and split-bolus injection(SBI) was used in experiment group. The radiation dose, image quality and diagnosis accuracy were compared. Results A total of 77 cases completed CTU examination successfully in the two groups, including 39 cases in control group and 38 cases in test group. The effective dose reduced from (26.68±4.07) in control group to (3.93±0.85) mSv in test group (t=-33.78, P 0.05). Signal-to-noise ratio (SNR) of objective image quality in test group was higher than that in control group (127.3±15.9 vs. 109.6±13.2, t=4.49, P 0.05) . For diagnosis accuracy, no statistical difference were found between two groups(84.62% and 81.58%, P>0.05). Conclusions The combination of low voltage scan with SAFIRE algorithm and split-bolus injection CTU could reduce the radiation dose significantly, but the objective image quality, CNR (except SNR) of subjective image quality and diagnosis accuracy were all unaffected obviously. Key words: Dual-source CT; Sinogram affirmed iterative reconstruction; Computed tomography urography; Split-bolus injection; Radiation dose
    • Correction
    • Source
    • Cite
    • Save
    • Machine Reading By IdeaReader
    0
    References
    0
    Citations
    NaN
    KQI
    []