Effect of hybrid iterative reconstruction technique on quantitative and qualitative image analysis at 256-slice prospective gating cardiac CT.

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Citation: European Radiology. 22(6):1287-94, 2012 Jun.PMID: 22200900Institution: MedStar Health Research Institute | MedStar Heart & Vascular InstituteForm of publication: Journal ArticleMedline article type(s): Journal ArticleSubject headings: *Algorithms | *Coronary Angiography/mt [Methods] | *Coronary Artery Disease/ra [Radiography] | *Radiographic Image Interpretation, Computer-Assisted/mt [Methods] | *Tomography, X-Ray Computed/mt [Methods] | Adult | Aged | Cardiac-Gated Imaging Techniques | Female | Humans | Male | Middle Aged | Radiographic Image Enhancement/mt [Methods] | Reproducibility of Results | Sensitivity and Specificity | Young AdultYear: 2012ISSN:
  • 0938-7994
Name of journal: European radiologyAbstract: CONCLUSIONS: Cardiac CT using hybrid iterative reconstruction yields higher CNR and better image quality than FBP.KEY POINTS: * Cardiac CT helps clinicians to assess patients with coronary artery disease * Hybrid iterative reconstruction provides improved cardiac CT image quality * Hybrid iterative reconstruction improves the number of assessable coronary segments * Hybrid iterative reconstruction improves interobserver agreement on cardiac CT.METHODS: Prospective cardiac CT images from 20 patients were analysed. Paired image sets were created using 3 reconstructions, i.e. filtered back projection (FBP) and moderate- and high-level iterative reconstructions. Quantitative parameters including CT-attenuation, noise, and contrast-to-noise ratio (CNR) were determined in both proximal- and distal coronary segments. Image quality was graded on a 4-point scale.OBJECTIVES: To evaluate the effect of hybrid iterative reconstruction on qualitative and quantitative parameters at 256-slice cardiac CT.RESULTS: Coronary CT attenuation values were similar for FBP, moderate- and high-level iterative reconstruction at 293 +/- 74-, 290 +/- 75-, and 283 +/- 78 Hounsfield units (HU), respectively. CNR was significantly higher with moderate- and high-level iterative reconstructions (10.9 +/- 3.5 and 18.4 +/- 6.2, respectively) than FBP (8.2 +/- 2.5) as was the visual grading of proximal vessels. Visualisation of distal vessels was better with high-level iterative reconstruction than FBP. The mean number of assessable segments among 289 segments was 245, 260, and 267 for FBP, moderate- and high-level iterative reconstruction, respectively; the difference between FBP and high-level iterative reconstruction was significant. Interobserver agreement was significantly higher for moderate- and high-level iterative reconstruction than FBP.All authors: Taylor AJ, Utsunomiya D, Weigold WG, Weissman GFiscal year: FY2012Date added to catalog: 2013-09-17
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Journal Article MedStar Authors Catalog Article 22200900 Available 22200900

CONCLUSIONS: Cardiac CT using hybrid iterative reconstruction yields higher CNR and better image quality than FBP.

KEY POINTS: * Cardiac CT helps clinicians to assess patients with coronary artery disease * Hybrid iterative reconstruction provides improved cardiac CT image quality * Hybrid iterative reconstruction improves the number of assessable coronary segments * Hybrid iterative reconstruction improves interobserver agreement on cardiac CT.

METHODS: Prospective cardiac CT images from 20 patients were analysed. Paired image sets were created using 3 reconstructions, i.e. filtered back projection (FBP) and moderate- and high-level iterative reconstructions. Quantitative parameters including CT-attenuation, noise, and contrast-to-noise ratio (CNR) were determined in both proximal- and distal coronary segments. Image quality was graded on a 4-point scale.

OBJECTIVES: To evaluate the effect of hybrid iterative reconstruction on qualitative and quantitative parameters at 256-slice cardiac CT.

RESULTS: Coronary CT attenuation values were similar for FBP, moderate- and high-level iterative reconstruction at 293 +/- 74-, 290 +/- 75-, and 283 +/- 78 Hounsfield units (HU), respectively. CNR was significantly higher with moderate- and high-level iterative reconstructions (10.9 +/- 3.5 and 18.4 +/- 6.2, respectively) than FBP (8.2 +/- 2.5) as was the visual grading of proximal vessels. Visualisation of distal vessels was better with high-level iterative reconstruction than FBP. The mean number of assessable segments among 289 segments was 245, 260, and 267 for FBP, moderate- and high-level iterative reconstruction, respectively; the difference between FBP and high-level iterative reconstruction was significant. Interobserver agreement was significantly higher for moderate- and high-level iterative reconstruction than FBP.

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