Cardiac imaging with multi-sector data acquisition in volumetric CT: variation of effective temporal resolution and its potential clinical consequences
2009
With increasing longitudinal detector dimension available in diagnostic volumetric CT, step-and-shoot scan is
becoming popular for cardiac imaging. In comparison to helical scan, step-and-shoot scan decouples patient table
movement from cardiac gating/triggering, which facilitates the cardiac imaging via multi-sector data acquisition, as well
as the administration of inter-cycle heart beat variation (arrhythmia) and radiation dose efficiency. Ideally, a multi-sector
data acquisition can improve temporal resolution at a factor the same as the number of sectors (best scenario). In reality,
however, the effective temporal resolution is jointly determined by gantry rotation speed and patient heart beat rate,
which may significantly lower than the ideal or no improvement (worst scenario). Hence, it is clinically relevant to
investigate the behavior of effective temporal resolution in cardiac imaging with multi-sector data acquisition. In this
study, a 5-second cine scan of a porcine heart, which cascades 6 porcine cardiac cycles, is acquired. In addition to
theoretical analysis and motion phantom study, the clinical consequences due to the effective temporal resolution
variation are evaluated qualitative or quantitatively. By employing a 2-sector image reconstruction strategy, a total of 15
(the permutation of P(6, 2)) cases between the best and worst scenarios are studied, providing informative guidance for
the design and optimization of CT cardiac imaging in volumetric CT with multi-sector data acquisition.
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