Iterative model reconstruction reduces calcified plaque volume in coronary CT angiography

Mihály Károlyi, Bálint Szilveszter, Márton Kolossváry, Csilla Celeng, Andrea Bartykowszki, L. Jermendy, Alexisz Panajotu, Júlia Karády, Béla Merkely, Pál Maurovich-Horvat

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11 Citations (Scopus)


Objective To assess the impact of iterative model reconstruction (IMR) on calcified plaque quantification as compared to filtered back projection reconstruction (FBP) and hybrid iterative reconstruction (HIR) in coronary computed tomography angiography (CTA). Methods Raw image data of 52 patients who underwent 256-slice CTA were reconstructed with IMR, HIR and FBP. We evaluated qualitative, quantitative image quality parameters and quantified calcified and partially calcified plaque volumes using automated software. Results Overall qualitative image quality significantly improved with HIR as compared to FBP, and further improved with IMR (p < 0.01 all). Contrast-to-noise ratios were improved with IMR, compared to HIR and FBP (51.0 [43.5–59.9], 20.3 [16.2–25.9] and 14.0 [11.2–17.7], respectively, all p < 0.01) Overall plaque volumes were lowest with IMR and highest with FBP (121.7 [79.3–168.4], 138.7 [90.6–191.7], 147.0 [100.7–183.6]). Similarly, calcified volumes (>130 HU) were decreased with IMR as compared to HIR and FBP (105.9 [62.1–144.6], 110.2 [63.8–166.6], 115.9 [81.7–164.2], respectively, p < 0.05 all). High-attenuation non-calcified volumes (90–129 HU) yielded similar values with FBP and HIR (p = 0.81), however it was lower with IMR (p < 0.05 both). Intermediate- (30–89 HU) and low-attenuation (<30 HU) non-calcified volumes showed no significant difference (p = 0.22 and p = 0.67, respectively). Conclusions IMR improves image quality of coronary CTA and decreases calcified plaque volumes.

Original languageEnglish
Pages (from-to)83-89
Number of pages7
JournalEuropean journal of radiology
Publication statusPublished - Feb 1 2017


  • Atherosclerotic plaque quantification
  • Cardiac imaging techniques
  • Coronary CT angiography
  • Coronary artery disease
  • Image reconstruction

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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  • Cite this

    Károlyi, M., Szilveszter, B., Kolossváry, M., Celeng, C., Bartykowszki, A., Jermendy, L., Panajotu, A., Karády, J., Merkely, B., & Maurovich-Horvat, P. (2017). Iterative model reconstruction reduces calcified plaque volume in coronary CT angiography. European journal of radiology, 87, 83-89.