Skip Navigation LinksHome > September/October 2013 - Volume 37 - Issue 5 > Effect of Lower Tube Voltage on the Reproducibility of Right...
Journal of Computer Assisted Tomography:
doi: 10.1097/RCT.0b013e3182994f37
Thoracic and Cardiovascular Imaging

Effect of Lower Tube Voltage on the Reproducibility of Right-to-Left Ventricular Diameter Ratio Measurements on Computed Tomographic Pulmonary Angiography Images

George, Elizabeth MBBS; Hunsaker, Andetta R. MD; Rybicki, Frank J. MD, PhD; Kumamaru, Kanako K. MD, PhD

Collapse Box


Objective: This study aimed to evaluate the interobserver variability of right-to-left ventricular (RV/LV) diameter ratios on computed tomographic pulmonary angiographies at reduced tube potential.

Methods: Consecutive computed tomographic pulmonary angiographies performed at 80 kVp for subjects weighing less than 80 kg (n = 40) and 100 kVp for those weighing 80 kg or greater (n = 40) were selected as the low peak kilovoltage cohort, with age- and sex-matched studies performed at 120 kVp forming the controls (n = 40 each). The interobserver variability in RV/LV diameter ratio on axial and 4-chamber images was evaluated.

Results: Interobserver correlation was excellent at both reduced tube voltages (correlation coefficients, 0.81–0.91; P < 0.001). Bland-Altman plots indicated higher variability at lower peak kilovoltage, confirmed only for axial measurements by multivariate regression adjusting for body weight and ventricular ratio (β coefficient = 0.04 and 0.03, P = 0.049 and 0.022, for 80 kVp and 100 kVp, respectively).

Conclusions: Lower tube voltage did not affect the reproducibility of RV/LV diameter ratio on 4-chamber images; for axial measurements, the increase in variability was 3% to 4% of the average ventricular ratio.

© 2013 by Lippincott Williams & Wilkins



Article Tools


Article Level Metrics

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.