Influence of heart rate and temporal resolution on left-ventricular volumes in cardiac multislice spiral computed tomography: a phantom study

Investigative Radiology
Andreas H MahnkenJoachim E Wildberger

Abstract

We sought to investigate the influence of heart rate and temporal resolution on the assessment of left-ventricular (LV) function with multislice spiral computed tomography (CT). A dynamic cardiac phantom was repeatedly scanned with a 64-slice CT scanner using a standardized scan protocol (64 x 0.6 mm, 120kV, 770mAs(eff), 330 milliseconds rotation time) at different simulated heart rates, ranging from 40 to 140 beats per minute. Images were reconstructed with an algorithm utilizing data from 1 to 4 cardiac cycles (RR intervals). Ejection fraction (EF), end-systolic, end-diastolic, and stroke volume as well as cardiac output were calculated. Results of the measurements were compared with the real volumes of the phantom. Interscan and intraobserver variability were calculated. Using a monosegmental reconstruction algorithm, the temporal resolution was fixed to 165 milliseconds. With bi-, tri-, and quad-segmental image reconstruction, mean temporal resolution was 128.3 +/- 33.2 milliseconds, 103.3 +/- 49.2 milliseconds, and 87.8 +/- 81.5 milliseconds, respectively. Multisegmental image reconstruction resulted in a lower deviation when comparing measured and real volumes. Using mono-, bi-, tri-, and quad-segmental image reconstructi...Continue Reading

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Citations

Oct 27, 2006·European Radiology·Andreas H MahnkenJoachim E Wildberger
Mar 1, 2012·American Journal of Veterinary Research·Christiane R HenjesPatrick Wefstaedt
May 4, 2016·The International Journal of Cardiovascular Imaging·Song Soo KimArthur E Stillman
Apr 1, 2009·Journal of Cardiovascular Computed Tomography·Amir A MahabadiQuynh A Truong
Jun 15, 2007·Investigative Radiology·Andreas H MahnkenJoachim E Wildberger
Feb 9, 2007·Investigative Radiology·Anja J ReimannMartin Heuschmid
Sep 22, 2009·Cardiology Clinics·Yasuyuki KobayashiRichard T George

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