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Enjilela E, Lee TY, Wisenberg G, Teefy P, Bagur R, Islam A, Hsieh J, So A. Cubic-Spline Interpolation for Sparse-View CT Image Reconstruction With Filtered Backprojection in Dynamic Myocardial Perfusion Imaging. ACTA ACUST UNITED AC 2020; 5:300-307. [PMID: 31572791 PMCID: PMC6752292 DOI: 10.18383/j.tom.2019.00013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
We investigated a projection interpolation method for reconstructing dynamic contrast-enhanced (DCE) heart images from undersampled x-ray projections with filtered backprojecton (FBP). This method may facilitate the application of sparse-view dynamic acquisition for ultralow-dose quantitative computed tomography (CT) myocardial perfusion (MP) imaging. We conducted CT perfusion studies on 5 pigs with a standard full-view acquisition protocol (984 projections). We reconstructed DCE heart images with FBP from all and a quarter of the measured projections evenly distributed over 360°. We interpolated the sparse-view (quarter) projections to a full-view setting using a cubic-spline interpolation method before applying FBP to reconstruct the DCE heart images (synthesized full-view). To generate MP maps, we used 3 sets of DCE heart images, and compared mean MP values and biases among the 3 protocols. Compared with synthesized full-view DCE images, sparse-view DCE images were more affected by streak artifacts arising from projection undersampling. Relative to the full-view protocol, mean bias in MP measurement associated with the sparse-view protocol was 10.0 mL/min/100 g (95%CI: −8.9 to 28.9), which was >3 times higher than that associated with the synthesized full-view protocol (3.3 mL/min/100 g, 95% CI: −6.7 to 13.2). The cubic-spline-view interpolation method improved MP measurement from DCE heart images reconstructed from only a quarter of the full projection set. This method can be used with the industry-standard FBP algorithm to reconstruct DCE images of the heart, and it can reduce the radiation dose of a whole-heart quantitative CT MP study to <2 mSv (at 8-cm coverage).
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Affiliation(s)
- Esmaeil Enjilela
- Imaging Research Laboratories, Robarts Research Institute, University of Western Ontario, London, ON, Canada
| | - Ting-Yim Lee
- Imaging Research Laboratories, Robarts Research Institute, University of Western Ontario, London, ON, Canada.,Imaging Program, Lawson Health Research Institute, London, ON, Canada
| | - Gerald Wisenberg
- Department of Cardiology, London Health Sciences Centre, London, ON, Canada
| | - Patrick Teefy
- Department of Cardiology, London Health Sciences Centre, London, ON, Canada
| | - Rodrigo Bagur
- Department of Cardiology, London Health Sciences Centre, London, ON, Canada
| | - Ali Islam
- Department of Radiology, St. Joseph's Healthcare London, London, ON, Canada; and
| | - Jiang Hsieh
- Department of Molecular Imaging & Computed Tomography, GE Healthcare, Waukesha WI
| | - Aaron So
- Imaging Research Laboratories, Robarts Research Institute, University of Western Ontario, London, ON, Canada.,Imaging Program, Lawson Health Research Institute, London, ON, Canada
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