Iterative model reconstruction: improved image quality of low-tube-voltage prospective ECG-gated coronary CT angiography images at 256-slice CT.

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Citation: European Journal of Radiology. 83(8):1408-15, 2014 Aug.PMID: 24873832Institution: MedStar Heart & Vascular InstituteForm of publication: Journal ArticleMedline article type(s): Journal ArticleSubject headings: *Cardiac-Gated Imaging Techniques/mt [Methods] | *Coronary Angiography/mt [Methods] | *Radiographic Image Interpretation, Computer-Assisted/mt [Methods] | *Tomography, X-Ray Computed/mt [Methods] | Adult | Aged | Aged, 80 and over | Contrast Media/du [Diagnostic Use] | Female | Humans | Iohexol/du [Diagnostic Use] | Male | Middle Aged | Quality Improvement | Retrospective StudiesISSN:
  • 0720-048X
Name of journal: European journal of radiologyAbstract: CONCLUSIONS: M-IR can provide significantly improved qualitative and quantitative image quality in prospectively gated coronary CTA using a low-tube-voltage.Copyright � 2014 Elsevier Ireland Ltd. All rights reserved.METHODS: Thirty patients (16 men, 14 women; mean age 52.2 +/- 13.2 years) underwent coronary CTA at 100-kVp on a 256-slice CT. Paired image sets were created using 3 types of reconstruction, i.e. filtered back projection (FBP), a hybrid type of iterative reconstruction (H-IR), and M-IR. Quantitative parameters including CT-attenuation, image noise, and contrast-to-noise ratio (CNR) were measured. The visual image quality, i.e. graininess, beam-hardening, vessel sharpness, and overall image quality, was scored on a 5-point scale. Lastly, coronary artery segments were evaluated using a 4-point scale to investigate the assessability of each segment.OBJECTIVES: To investigate the effects of a new model-based type of iterative reconstruction (M-IR) technique, the iterative model reconstruction, on image quality of prospectively gated coronary CT angiography (CTA) acquired at low-tube-voltage.RESULTS: There was no significant difference in coronary arterial CT attenuation among the 3 reconstruction methods. The mean image noise of FBP, H-IR, and M-IR images was 29.3 +/- 9.6, 19.3 +/- 6.9, and 12.9 +/- 3.3 HU, respectively, there were significant differences for all comparison combinations among the 3 methods (p<0.01). The CNR of M-IR was significantly better than of FBP and H-IR images (13.5 +/- 5.0 [FBP], 20.9 +/- 8.9 [H-IR] and 39.3 +/- 13.9 [M-IR]; p<0.01). The visual scores were significantly higher for M-IR than the other images (p<0.01), and 95.3% of the coronary segments imaged with M-IR were of assessable quality compared with 76.7% of FBP- and 86.9% of H-IR images.All authors: Oda S, Vembar M, Weigold WG, Weissman GDigital Object Identifier: Date added to catalog: 2015-04-29
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Journal Article MedStar Authors Catalog Article Available 24873832

CONCLUSIONS: M-IR can provide significantly improved qualitative and quantitative image quality in prospectively gated coronary CTA using a low-tube-voltage.Copyright � 2014 Elsevier Ireland Ltd. All rights reserved.

METHODS: Thirty patients (16 men, 14 women; mean age 52.2 +/- 13.2 years) underwent coronary CTA at 100-kVp on a 256-slice CT. Paired image sets were created using 3 types of reconstruction, i.e. filtered back projection (FBP), a hybrid type of iterative reconstruction (H-IR), and M-IR. Quantitative parameters including CT-attenuation, image noise, and contrast-to-noise ratio (CNR) were measured. The visual image quality, i.e. graininess, beam-hardening, vessel sharpness, and overall image quality, was scored on a 5-point scale. Lastly, coronary artery segments were evaluated using a 4-point scale to investigate the assessability of each segment.

OBJECTIVES: To investigate the effects of a new model-based type of iterative reconstruction (M-IR) technique, the iterative model reconstruction, on image quality of prospectively gated coronary CT angiography (CTA) acquired at low-tube-voltage.

RESULTS: There was no significant difference in coronary arterial CT attenuation among the 3 reconstruction methods. The mean image noise of FBP, H-IR, and M-IR images was 29.3 +/- 9.6, 19.3 +/- 6.9, and 12.9 +/- 3.3 HU, respectively, there were significant differences for all comparison combinations among the 3 methods (p<0.01). The CNR of M-IR was significantly better than of FBP and H-IR images (13.5 +/- 5.0 [FBP], 20.9 +/- 8.9 [H-IR] and 39.3 +/- 13.9 [M-IR]; p<0.01). The visual scores were significantly higher for M-IR than the other images (p<0.01), and 95.3% of the coronary segments imaged with M-IR were of assessable quality compared with 76.7% of FBP- and 86.9% of H-IR images.

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