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Article

Split vs. Single Bolus CT Urography: Comparison of Scan Time, Image Quality and Radiation Dose

Queen Elizabeth II Health Sciences Centre, Department of Diagnostic Radiology, Dalhousie University, Halifax, NS B3H 2Y9, Canada
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Author to whom correspondence should be addressed.
Academic Editor: Brian D. Ross
Tomography 2021, 7(2), 210-218; https://doi.org/10.3390/tomography7020019
Received: 14 April 2021 / Revised: 13 May 2021 / Accepted: 18 May 2021 / Published: 20 May 2021
The purpose of this study was to compare the scan time, image quality and radiation dose of CT urograms (CTU) using a split vs. single bolus contrast media injection technique. A total of 241 consecutive CTUs performed between August 2019-February 2020 were retrospectively reviewed. There were three study groups: Group 1, <50 years old, 50/80 cc split-bolus administered at 0 and 700 s post initiation of injection, with combined nephrographic and excretory phases; group 2, ≥50 years old, same split-bolus protocol; and group 3, ≥50 years old, 130 cc single bolus injection, with nephrographic and excretory phases acquired at 100 s and 460 s post injection initiation. The recorded data elements were scan time, number of excretory phases, imaging quality based on opacification of the urinary collecting system (<50%, 50–75%, 75–100%), and dose-length product (DLP). Associations between group and categorical variables were assessed (Chi-square); mean scan time and DLP were compared (one-way ANOVA). Following analysis, proportionally fewer CTUs required a repeat excretory phase in group 3 (32/112, 28.6%) than in groups 1 (25/48, 52.1%) and 2 (37/80, 46.3%) (p = 0.006). Mean scan time was significantly lower in group 3 (678 s) than in groups 1 (1046 s) and 2 (978 s) (p < 0.0001). There was no association between groups and image quality (p = 0.13). DLP was higher in group 3 (1422 ± 837 mGy·cm) than in groups 1 (1041 ± 531 mGy·cm) and 2 (1137 ± 646 mGy·cm) (p = 0.003). In conclusion, single bolus CTU resulted in significantly fewer repeat phases and faster scan time at the expense of a slightly higher radiation dose. View Full-Text
Keywords: computed tomography urography; hematuria; radiation dose; imaging quality; time analysis computed tomography urography; hematuria; radiation dose; imaging quality; time analysis
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MDPI and ACS Style

Morrison, N.; Bryden, S.; Costa, A.F. Split vs. Single Bolus CT Urography: Comparison of Scan Time, Image Quality and Radiation Dose. Tomography 2021, 7, 210-218. https://doi.org/10.3390/tomography7020019

AMA Style

Morrison N, Bryden S, Costa AF. Split vs. Single Bolus CT Urography: Comparison of Scan Time, Image Quality and Radiation Dose. Tomography. 2021; 7(2):210-218. https://doi.org/10.3390/tomography7020019

Chicago/Turabian Style

Morrison, Nicole; Bryden, Sherrie; Costa, Andreu F. 2021. "Split vs. Single Bolus CT Urography: Comparison of Scan Time, Image Quality and Radiation Dose" Tomography 7, no. 2: 210-218. https://doi.org/10.3390/tomography7020019

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