Abstract
Background
Respiratory motion (RM) complicates the analysis of myocardial perfusion (MP) single-photon emission computed tomography (SPECT) images. The effects of RM on left ventricular (LV) functional variables have not been thoroughly investigated.
Methods and results
Thoracic electrical bioimpedance and electrocardiographic signals were recorded from eighteen patients undergoing the rest phase of a 1-day stress/rest cardiac-gated MP-SPECT examination. The signals and list-mode emission data were retrospectively processed to yield standard cardiac- and dual-gated (respiratory and cardiac gating) image sets applying a novel algorithm. LV volume, MP, shape index (SI), wall motion (WM), wall thickening (WT), and phase analysis parameters were measured with Quantitative Perfusion SPECT/Quantitative Gated SPECT software (Cedars-Sinai Medical Center). Image quality was evaluated by three experienced physicians. Dual gating increased LV volume (77.1 ± 26.8 vs 79.8 ± 27.6 mL, P = .006) and decreased SI (0.57 ± 0.05 vs 0.56 ± 0.05, P = .036) and global WT (39.0 ± 11.8% vs 36.9 ± 9.4%, P = .034) compared to cardiac gating, but did not significantly alter perfusion, WM or phase analysis parameters or image quality (P > .05).
Conclusions
RM reduction has an effect on LV volume, shape, and WT parameters. RM exerts no significant effect on phase analysis parameters.
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Abbreviations
- LV:
-
Left ventricular
- MP:
-
Myocardial perfusion
- RM:
-
Respiratory motion
- SI:
-
Shape index
- SPECT:
-
Single-photon emission computed tomography
- WM:
-
Wall motion
- WT:
-
Wall thickening
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Acknowledgments
The study was supported by Kuopio University Hospital (VTR, Project 5031351), University of Eastern Finland (The Doctoral Programme in Science, Technology and Computing), and by the Academy of Finland (Finnish Centre of Excellence in Inverse Problems Research, Project Number 250215). The authors express thanks to Pekka Tiihonen, PhD, for providing the pulse generator for the examinations, Owen Dillon, BSc(Hons), for guidance in the image registration code optimization, and Ewen MacDonald, PharmD, and Gerald Netto, PhD, for linguistic advice.
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Kortelainen, M.J., Koivumäki, T.M., Vauhkonen, M.J. et al. Respiratory motion reduction with a dual gating approach in myocardial perfusion SPECT: Effect on left ventricular functional parameters. J. Nucl. Cardiol. 25, 1633–1641 (2018). https://doi.org/10.1007/s12350-017-0844-9
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DOI: https://doi.org/10.1007/s12350-017-0844-9