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Is it possible to predict heart rate and range during enhanced cardiac CT scan from previous non-enhanced cardiac CT?

Jun Horiguchi1, Hideya Yamamoto, Ryuichi Arie

  • 1Department of Clinical Radiology, Hiroshima University Hospital, Minami-ku, Hiroshima, Japan. horiguchi@hiroshimairyo.or.jp

Journal of Digital Imaging
|September 9, 2010
PubMed

Insights

Predicting heart rate during cardiac CT is possible using non-enhanced scans. However, predicting heart rate variation during enhanced cardiac CT from prior non-enhanced scans is difficult.

Area of Science:

  • Radiology
  • Cardiovascular Imaging

Background:

  • Heart rate and its variation significantly impact cardiac computed tomography (CT) image quality.
  • Accurate assessment of cardiac function and anatomy relies on optimal scan parameters.

Purpose of the Study:

  • To determine if heart rate and its range during enhanced cardiac CT scans can be predicted from non-enhanced cardiac CT scans.
  • To evaluate the correlation between heart rate parameters in different cardiac CT acquisition types.

Main Methods:

  • Electrocardiograph (ECG) data from 112 patients undergoing three cardiac CT protocols (non-enhanced, prospective ECG-triggered, retrospective ECG-gated) were analyzed.
  • Mean heart rate, heart rate range, and range ratio were compared across scan types.
  • Correlation coefficients were calculated to assess the predictability of heart rate parameters.

Main Results:

  • Mean heart rates were similar across all scan types (approximately 60 bpm).
  • Heart rate on enhanced scans showed strong correlation with non-enhanced scans (r=0.78, 0.74).
  • Heart rate ranges during enhanced scans were significantly higher and poorly predicted by non-enhanced scans (r=0.27 and -0.027).

Conclusions:

  • Mean heart rate during enhanced cardiac CT is predictable from non-enhanced scans.
  • Heart rate variability during enhanced cardiac CT is difficult to predict from non-enhanced scans, impacting image quality.
  • Further research is needed to optimize scan protocols for variable heart rates in cardiac CT.

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