Evaluation of different respiratory gating schemes for cardiac SPECT

UMMS Affiliation

Department of Radiology

Publication Date


Document Type



Cardiology | Radiology


BACKGROUND: Respiratory gating reduces motion blurring in cardiac SPECT. Here we aim to evaluate the performance of three respiratory gating strategies using a population of digital phantoms with known truth and clinical data.

METHODS: We analytically simulated 60 projections for 10 XCAT phantoms with (99m)Tc-sestamibi distributions using three gating schemes: equal amplitude gating (AG), equal count gating (CG), and equal time gating (TG). Clinical list-mode data for 10 patients who underwent (99m)Tc-sestamibi scans were also processed using the 3 gating schemes. Reconstructed images in each gate were registered to a reference gate, averaged and reoriented to generate the polar plots. For simulations, image noise, relative difference (RD) of averaged count for each of the 17 segment, and relative defect size difference (RSD) were analyzed. For clinical data, image intensity profile and FWHM were measured across the left ventricle wall.

RESULTS: For simulations, AG and CG methods showed significantly lower RD and RSD compared to TG, while noise variation was more non-uniform through different gates for AG. In the clinical study, AG and CG had smaller FWHM than TG.

CONCLUSIONS: AG and CG methods show better performance for motion reduction and are recommended for clinical respiratory gating SPECT implementation.


Cardiac perfusion, Respiratory gating, SPECT/CT, Simulation

DOI of Published Version



J Nucl Cardiol. 2018 Aug 7. doi: 10.1007/s12350-018-1392-7. [Epub ahead of print] Link to article on publisher's site

Journal/Book/Conference Title

Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology

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Link to Article in PubMed

PubMed ID