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

Utsunomiya, Daisuke; Weigold, Wm. Guy; Weissman, Gaby; Taylor, Allen J.

doi:10.1007/s00330-011-2361-6

Cited by 71 publications

(44 citation statements)

References 27 publications

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“…However, it has to be emphasized that the image quality scores reported here represent the highly subjective image impression of the three readers in this study and may be different when other radiologists score the images. When using advanced hybrid IR, noise texture and spatial resolution were reported as constant by Utsunomiya et al, although slight differences between image texture between FBP and IR were described [28]. In our study, differences in the subjective image quality between the medium and high level of IR were found to be significant in favor of a medium level of IR leading to an improvement of almost 25 %.…”

supporting

confidence: 39%

“…Many studies have been published within the last years reporting on noise reduction and improvement of low-contrast image quality due to IR in CT examinations of the abdomen [13], the thorax [14,15] and the heart [25 -27]. In recent studies by Utsunomiya et al and Laqmani et al, a progressive improvement of the CNR and subjective image quality in cardiac CT and lowdose chest CT was reported when using different levels of IR compared to FBP [28,29].…”

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confidence: 99%

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Impact of Increasing Levels of Advanced Iterative Reconstruction on Image Quality in Low-Dose Cardiac CT Angiography

Kröpil

Bigdeli

Nagel

et al. 2014

Fortschr Röntgenstr

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Purpose: To investigate the effects of an advanced iterative reconstruction (IR) technique on subjective and objective image quality (IQ) in low-dose cardiac CT angiography (CCTA). Materials and Methods: 30 datasets of prospectively triggered ?step-and-shoot? CCTA scans acquired on a 256-slice CT scanner with optimized exposure settings were processed on a prototype IR system using filtered back-projection (FBP) and 4 levels of advanced IR (iDose4, Philips) providing incremental rates of IR (level 2, 4, 6, 7). In addition, the effects of different reconstruction kernels (semi-smooth [CB], standard with edge-enhancement [XCB]) and a ?multi-resolution? feature [MR] to preserve the noise power spectrum were evaluated resulting in a total of n?=?480 image sets. Contrast-to-noise ratios (CNR) were computed from regions of interest at 9 coronary locations. The subjective IQ was rated on a 4-point-scale with ?classic? image appearance and noise-related artifacts as main criteria. Results: At an effective dose of 1.7???0.7?mSv, the CNR significantly improved with every increasing level of IR (range: 14.2???27.8; p?

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supporting

confidence: 39%

mentioning

confidence: 99%

Impact of Increasing Levels of Advanced Iterative Reconstruction on Image Quality in Low-Dose Cardiac CT Angiography

Kröpil

Bigdeli

Nagel

et al. 2014

Fortschr Röntgenstr

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“…Instead, reduced image noise was observed with increasing iteration. Utsunomiya et al demonstrated the same results in a different, albeit smaller, patient study using the same iteration algorithm [14,24].…”

Section: Limitationsmentioning

confidence: 64%

“…Real plaque can be differentiated from artefacts partly with the aid of HIR. There are currently no published patient studies on the influence of iDose on calcium score in non-contrast cardiac CT. A phantom study conducted by Murazaki et al [15] as well as CTangiography studies performed on phantoms [14] and phantom studies on plaque volume [24,25] can be used for comparison. In their CTA study, Takx et al demonstrated for one that the HIR algorithm improves objective image quality, while having no influence on the quantitative analysis of coronary plaque volume, the analysis of calcium plaque composition or statements on vascular lumen [25].…”

Section: Radiation Dosementioning

confidence: 99%

Impact of Hybrid Iterative Reconstruction on Agatston Coronary Artery Calcium Scores in Comparison to Filtered Back Projection in Native Cardiac CT

Obmann

Klink

Heverhagen

et al. 2015

Fortschr Röntgenstr

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Purpose: To investigate whether the effects of hybrid iterative reconstruction (HIR) on coronary artery calcium (CAC) measurements using the Agatston score lead to changes in assignment of patients to cardiovascular risk groups compared to filtered back projection (FBP). Materials and Methods: 68 patients (mean age 61.5 years; 48 male; 20 female) underwent prospectively ECG-gated, non-enhanced, cardiac 256-MSCT for coronary calcium scoring. Scanning parameters were as follows: Tube voltage, 120 kV; Mean tube current time-product 63.67?mAs (50???150?mAs); collimation, 2???128???0.625?mm. Images were reconstructed with FBP and with HIR at all levels (L1 to L7). Two independent readers measured Agatston scores of all reconstructions and assigned patients to cardiovascular risk groups. Scores of HIR and FBP reconstructions were correlated (Spearman). Interobserver agreement and variability was assessed with ?-statistics and Bland-Altmann-Plots. Results: Agatston scores of HIR reconstructions were closely correlated with FBP reconstructions (L1, R?=?0.9996; L2, R?=?0.9995; L3, R?=?0.9991; L4, R?=?0.986; L5, R?=?0.9986; L6, R?=?0.9987; and L7, R?=?0.9986). In comparison to FBP, HIR led to reduced Agatston scores between 97?% (L1) and 87.4?% (L7) of the FBP values. Using HIR iterations L1???L3, all patients were assigned to identical risk groups as after FPB reconstruction. In 5.4?% of patients the risk group after HIR with the maximum iteration level was different from the group after FBP reconstruction. Conclusion: There was an excellent correlation of Agatston scores after HIR and FBP with identical risk group assignment at levels 1 - 3 for all patients. Hence it appears that the application of HIR in routine calcium scoring does not entail any disadvantages. Thus, future studies are needed to demonstrate whether HIR is a reliable method for reducing radiation dose in coronary calcium scoring. Key Points: ??Agatston-Scores showed excellent correlation between HIR and FBP. ??The higher the HIR Level, the more Agatston scores deviated to lower values. ??No change in risk group assignment using Level 1???3. ??Change in risk group assignment when using HIR compared to FBP in 1.5?% (Level?4), 5.4?% (Level 5???7). Citation Format: ??Obmann VC, Klink T, Heverhagen JT et?al. Impact of Hybrid Iterative Reconstruction on Agatston Coronary Artery Calcium Scores in Comparison to Filtered Back Projection in Native Cardiac CT. Fortschr R?ntgenstr 2015; 187: 372???379

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“…Daisuke Utsunomiya et al suggest that using iDose yields higher CNR and better image quality than FBP. He also stated that there is not so significant change in image quality using level 3 iDose compare with iDose 7 [17] (Figure 1). …”

Section: Discussionmentioning

confidence: 97%

Hybrid Iterative Reconstruction Algorithm Improves Image Quality and Helps to Decrease Radiation Dose in 256-Slides Craniocervical CTA

Sharma¹

2014

OMICS J Radiol

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

Cited by 71 publications

References 27 publications

Impact of Increasing Levels of Advanced Iterative Reconstruction on Image Quality in Low-Dose Cardiac CT Angiography

Impact of Increasing Levels of Advanced Iterative Reconstruction on Image Quality in Low-Dose Cardiac CT Angiography

Impact of Hybrid Iterative Reconstruction on Agatston Coronary Artery Calcium Scores in Comparison to Filtered Back Projection in Native Cardiac CT

Hybrid Iterative Reconstruction Algorithm Improves Image Quality and Helps to Decrease Radiation Dose in 256-Slides Craniocervical CTA

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