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Verelst E, Buls N, De Mey J, Nieboer KH, Vandenbergh F, Crotty D, Deak P, Sundvall A, Holmin S, De Smet A, Provyn S, Van Gompel G. Stent appearance in a novel silicon-based photon-counting CT prototype: ex vivo phantom study in head-to-head comparison with conventional energy-integrating CT. Eur Radiol Exp 2023; 7:23. [PMID: 37097376 PMCID: PMC10130245 DOI: 10.1186/s41747-023-00333-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 02/23/2023] [Indexed: 04/26/2023] Open
Abstract
BACKGROUND In this study, stent appearance in a novel silicon-based photon-counting computed tomography (Si-PCCT) prototype was compared with a conventional energy-integrating detector CT (EIDCT) system. METHODS An ex vivo phantom was created, consisting of a 2% agar-water mixture, in which human-resected and stented arteries were individually embedded. Using similar technique parameters, helical scan data was acquired using a novel prototype Si-PCCT and a conventional EIDCT system at a volumetric CT dose index (CTDIvol) of 9 mGy. Reconstructions were made at 502 and 1502 mm2 field-of-views (FOVs) using a bone kernel and adaptive statistical iterative reconstruction with 0% blending. Using a 5-point Likert scale, reader evaluations were performed on stent appearance, blooming and inter-stent visibility. Quantitative image analysis was performed on stent diameter accuracy, blooming and inter-stent distinction. Qualitative and quantitative differences between Si-PCCT and EIDCT systems were tested with a Wilcoxon signed-rank test and a paired samples t-test, respectively. Inter- and intra-reader agreement was assessed using the intraclass correlation coefficient (ICC). RESULTS Qualitatively, Si-PCCT images were rated higher than EIDCT images at 150-mm FOV, based on stent appearance (p = 0.026) and blooming (p = 0.015), with a moderate inter- (ICC = 0.50) and intra-reader (ICC = 0.60) agreement. Quantitatively, Si-PCCT yielded more accurate diameter measurements (p = 0.001), reduced blooming (p < 0.001) and improved inter-stent distinction (p < 0.001). Similar trends were observed for the images reconstructed at 50-mm FOV. CONCLUSIONS When compared to EIDCT, the improved spatial resolution of Si-PCCT yields enhanced stent appearance, more accurate diameter measurements, reduced blooming and improved inter-stent distinction. KEY POINTS • This study evaluated stent appearance in a novel silicon-based photon-counting computed tomography (Si-PCCT) prototype. • Compared to standard CT, Si-PCCT resulted in more accurate stent diameter measurements. • Si-PCCT also reduced blooming artefacts and improved inter-stent visibility.
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Affiliation(s)
- Emma Verelst
- Department of Radiology, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZB), Laarbeeklaan 101, 1090, Brussels, Belgium.
| | - Nico Buls
- Department of Radiology, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZB), Laarbeeklaan 101, 1090, Brussels, Belgium
| | - Johan De Mey
- Department of Radiology, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZB), Laarbeeklaan 101, 1090, Brussels, Belgium
| | - Koenraad Hans Nieboer
- Department of Radiology, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZB), Laarbeeklaan 101, 1090, Brussels, Belgium
| | - Frans Vandenbergh
- Department of Radiology, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZB), Laarbeeklaan 101, 1090, Brussels, Belgium
| | | | - Paul Deak
- GE Healthcare, Waukesha, WI, 53188, USA
| | - Albert Sundvall
- Department of Medical Radiation Physics and Nuclear Medicine, Karolinska University Hospital, 171 76, Stockholm, Sweden
| | - Staffan Holmin
- Department of Clinical Neuroscience, Karolinska Institutet and Department of Neuroradiology, 171 74, Stockholm, Sweden
| | - Aron De Smet
- Anatomical Research Training and Education, Vrije Universiteit Brussel, 1090, Brussels, Belgium
| | - Steven Provyn
- Anatomical Research Training and Education, Vrije Universiteit Brussel, 1090, Brussels, Belgium
| | - Gert Van Gompel
- Department of Radiology, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZB), Laarbeeklaan 101, 1090, Brussels, Belgium
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Effect of energy difference in the evaluation of calcification size and luminal diameter in calcified coronary artery plaque using spectral CT. Jpn J Radiol 2020; 38:1142-1149. [PMID: 32767199 DOI: 10.1007/s11604-020-01027-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 07/30/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE This study evaluated the calcium blooming-reducing effect and the differences of luminal diameter among various-energy virtual monochromatic images (VMIs) using rapid kilovolt-switching dual-energy computed tomography (DECT). MATERIALS AND METHODS Forty-five calcified segments in 31 patients were analyzed. For the analysis, 40- to 140-keV VMIs on both non-contrast CT and coronary CT angiography were generated at 10-keV steps, and calcification size and luminal diameter were measured using CT number profile curve and full-width at half-maximum method. We compared calcification size and luminal diameter on each keV VMIs with those on 70-keV VMI. RESULTS There was no significant differences among the 40- to 140-keV VMIs regarding calcification size or luminal diameter. CONCLUSION The 40- to 140-keV VMIs produced by single-source DECT had no effect on the calcification size or luminal diameter in the coronary artery.
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Wu D, Zhao L, Liu Y, Wang J, Hu W, Feng X, Lv Z, Li Y, Yao X. The superiority of 256-slice spiral computed tomography angiography for preoperative evaluation of surrounding arteries in patients with gastric cancer. Onco Targets Ther 2017; 10:927-933. [PMID: 28243128 PMCID: PMC5317298 DOI: 10.2147/ott.s88330] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
OBJECTIVE To evaluate the utilization of 256-slice spiral computed tomography (CT) angiography in preoperative assessment of perigastric vascular anatomy in patients with gastric cancer. METHODS In this study, 80 gastric cancer patients were included. The medical procedure of 256-slice spiral CT angiography was performed on each of these patients consecutively. Thereafter, these patients were subjected to surgical treatment in our hospital. The techniques of volume rendering (VR) and maximum intensity projection (MIP) were used to image reconstruction of arteries around the stomach. RESULTS Both VR and MIP were applied to reconstruct the images of perigastric arteries. The results indicated that VR imaging was inferior to MIP in determining the variant small artery anatomy around the greater curvature and fundus. The respective rates of imaging produced by VR and MIP for left gastroepiploic artery, short gastric artery, and posterior gastric artery, were 32.50% versus 100%, 16.25% versus 87.50%, and 3.75% versus 25.00%, respectively. According to Hiatt's classification, 75 out of 240 cases were abnormal types, among which we found Type II in 30 cases, Type III in 33 cases, Type IV in three cases, Type V in six cases, and Type VI in only three cases. There was no significant difference for total and every single variation type, between our group and Hiatt's group (P>0.05). CONCLUSION The 256-slice spiral CT angiography can be regarded as an effective and accurate diagnostic modality for preoperative assessing anatomical arterial variations in gastric cancer; MIP was superior to VR at identifying variations of some small artery, whereas VR was better than MIP at showing anatomical arterial variations due to its three-dimensional effect.
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Affiliation(s)
- Deqing Wu
- Department of General Surgery, Guangdong General Hospital and Guangdong Academy of Medical Sciences, Guangzhou, People's Republic of China
| | - Linyong Zhao
- Department of General Surgery, Guangdong General Hospital and Guangdong Academy of Medical Sciences, Guangzhou, People's Republic of China
| | - Ying Liu
- Department of General Surgery, Guangdong General Hospital and Guangdong Academy of Medical Sciences, Guangzhou, People's Republic of China
| | - Junjiang Wang
- Department of General Surgery, Guangdong General Hospital and Guangdong Academy of Medical Sciences, Guangzhou, People's Republic of China
| | - Weixian Hu
- Department of General Surgery, Guangdong General Hospital and Guangdong Academy of Medical Sciences, Guangzhou, People's Republic of China
| | - Xingyu Feng
- Department of General Surgery, Guangdong General Hospital and Guangdong Academy of Medical Sciences, Guangzhou, People's Republic of China
| | - Zejian Lv
- Department of General Surgery, Guangdong General Hospital and Guangdong Academy of Medical Sciences, Guangzhou, People's Republic of China
| | - Yong Li
- Department of General Surgery, Guangdong General Hospital and Guangdong Academy of Medical Sciences, Guangzhou, People's Republic of China
| | - Xueqing Yao
- Department of General Surgery, Guangdong General Hospital and Guangdong Academy of Medical Sciences, Guangzhou, People's Republic of China
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Gitsioudis G, Fortner P, Stuber M, Missiou A, Andre F, Müller OJ, Katus HA, Korosoglou G. Off-resonance magnetic resonance angiography improves visualization of in-stent lumen in peripheral nitinol stents compared to conventional T1-weighted acquisitions: an in vitro comparison study. Int J Cardiovasc Imaging 2016; 32:1645-1655. [PMID: 27535040 DOI: 10.1007/s10554-016-0955-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 08/02/2016] [Indexed: 10/21/2022]
Abstract
To compare the value of inversion recovery with on-resonant water suppression (IRON) to conventional T1-weighted (T1w) MRA and computed tomography angiography (CTA) for visualization of peripheral nitinol stents. We visualized 14 different peripheral nitinol stents in vitro both using Gadolinium (Gd) and ultrasmall superparamagnetic iron nanoparticles (USPIOs) for conventional T1w and IRON-MRA using clinical grade 1.5T MR scanner and iodinated contrast material for CTA using a 256-slice CT scanner. Parameter assessment included signal- and contrast-to-noise ratio (S/CNR), relative in-stent signal and artificial lumen narrowing. X-ray angiography served as gold standard for diameter assessment. Gd-enhanced IRON-MRA exhibited highest in-stent SNR and CNR values compared to conventional T1w MRA (IRON (Gd/USPIO): SNR = 30 ± 3/21 ± 2, CNR = 23 ± 2/14 ± 1; T1w: SNR = 16 ± 1/14 ± 2, CNR = 12 ± 1/10 ± 1, all p < 0.05). Furthermore, IRON-MRA achieved highest relative in-stent signal both using Gd and USPIO (IRON (Gd/USPIO): 121 ± 8 %/103 ± 6 %; T1w: 73 ± 2 %/66 ± 4 %; CTA: 84 ± 6 %, all p < 0.05). However, artificial lumen narrowing appeared similar in all imaging protocols (IRON (Gd/USPIO): 21 ± 3 %/21 ± 2 %; T1w: 16 ± 4 %/17 ± 3 %; CTA: 19 ± 2 %, all p = NS). Finally, IRON-MRA provided improvement of the in-stent lumen visualization with an 'open-close-open' design, which revealed a complete in-stent signal loss in T1w MRA. IRON-MRA improves in-stent visualization in vitro compared to conventional T1w MRA and CTA. In light of the in vitro results with Gd-enhanced IRON-MRA, the clinical implementation of such an approach appears promising.
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Affiliation(s)
- Gitsios Gitsioudis
- Clinic of Internal Medicine, Department of Cardiology, University of Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.
| | - Philipp Fortner
- Clinic of Internal Medicine, Department of Cardiology, University of Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Matthias Stuber
- Russell H. Morgan Department of Radiology and Radiological Sciences, Division of MR Research, Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Center for Biomedical Imaging (CIBM), University Hospital Lausanne, Lausanne, Switzerland
| | - Anna Missiou
- Clinic of Internal Medicine, Department of Cardiology, University of Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Florian Andre
- Clinic of Internal Medicine, Department of Cardiology, University of Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Oliver J Müller
- Clinic of Internal Medicine, Department of Cardiology, University of Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Hugo A Katus
- Clinic of Internal Medicine, Department of Cardiology, University of Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Grigorios Korosoglou
- Clinic of Internal Medicine, Department of Cardiology, University of Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
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Tan S, Soulez G, Diez Martinez P, Larrivée S, Stevens LM, Goussard Y, Mansour S, Chartrand-Lefebvre C. Coronary Stent Artifact Reduction with an Edge-Enhancing Reconstruction Kernel - A Prospective Cross-Sectional Study with 256-Slice CT. PLoS One 2016; 11:e0154292. [PMID: 27128507 PMCID: PMC4851391 DOI: 10.1371/journal.pone.0154292] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 04/12/2016] [Indexed: 11/23/2022] Open
Abstract
Purpose Metallic artifacts can result in an artificial thickening of the coronary stent wall which can significantly impair computed tomography (CT) imaging in patients with coronary stents. The objective of this study is to assess in vivo visualization of coronary stent wall and lumen with an edge-enhancing CT reconstruction kernel, as compared to a standard kernel. Methods This is a prospective cross-sectional study involving the assessment of 71 coronary stents (24 patients), with blinded observers. After 256-slice CT angiography, image reconstruction was done with medium-smooth and edge-enhancing kernels. Stent wall thickness was measured with both orthogonal and circumference methods, averaging thickness from diameter and circumference measurements, respectively. Image quality was assessed quantitatively using objective parameters (noise, signal to noise (SNR) and contrast to noise (CNR) ratios), as well as visually using a 5-point Likert scale. Results Stent wall thickness was decreased with the edge-enhancing kernel in comparison to the standard kernel, either with the orthogonal (0.97 ± 0.02 versus 1.09 ± 0.03 mm, respectively; p<0.001) or the circumference method (1.13 ± 0.02 versus 1.21 ± 0.02 mm, respectively; p = 0.001). The edge-enhancing kernel generated less overestimation from nominal thickness compared to the standard kernel, both with the orthogonal (0.89 ± 0.19 versus 1.00 ± 0.26 mm, respectively; p<0.001) and the circumference (1.06 ± 0.26 versus 1.13 ± 0.31 mm, respectively; p = 0.005) methods. The edge-enhancing kernel was associated with lower SNR and CNR, as well as higher background noise (all p < 0.001), in comparison to the medium-smooth kernel. Stent visual scores were higher with the edge-enhancing kernel (p<0.001). Conclusion In vivo 256-slice CT assessment of coronary stents shows that the edge-enhancing CT reconstruction kernel generates thinner stent walls, less overestimation from nominal thickness, and better image quality scores than the standard kernel.
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Affiliation(s)
- Stéphanie Tan
- Radiology, University of Montreal Medical Center (CHUM), Montreal, Canada
| | - Gilles Soulez
- Radiology, University of Montreal Medical Center (CHUM), Montreal, Canada
- University of Montreal Medical Center Research Center, Montreal, Canada
| | | | - Sandra Larrivée
- University of Montreal Medical Center Research Center, Montreal, Canada
- Biostatistics, Pennington Biomedical Research Center, Bâton Rouge, Louisiana, United States of America
| | - Louis-Mathieu Stevens
- University of Montreal Medical Center Research Center, Montreal, Canada
- Cardiac Surgery, University of Montreal Medical Center (CHUM), Montreal, Canada
| | - Yves Goussard
- Electrical Engineering, Ecole Polytechnique de Montréal, Montreal, Canada
| | - Samer Mansour
- University of Montreal Medical Center Research Center, Montreal, Canada
- Cardiology, University of Montreal Medical Center (CHUM), Montreal, Canada
| | - Carl Chartrand-Lefebvre
- Radiology, University of Montreal Medical Center (CHUM), Montreal, Canada
- University of Montreal Medical Center Research Center, Montreal, Canada
- * E-mail:
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High-definition computed tomography for coronary artery stents imaging: Initial evaluation of the optimal reconstruction algorithm. Eur J Radiol 2015; 84:834-9. [DOI: 10.1016/j.ejrad.2015.02.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 12/04/2014] [Accepted: 02/02/2015] [Indexed: 11/23/2022]
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André F, Müller D, Korosoglou G, Hosch W, Kauczor HU, Katus HA, Steen H. In-vitro assessment of coronary artery stents in 256-multislice computed tomography angiography. BMC Res Notes 2014; 7:38. [PMID: 24423187 PMCID: PMC3904014 DOI: 10.1186/1756-0500-7-38] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 12/30/2013] [Indexed: 11/10/2022] Open
Abstract
Background The important detection of in-stent restenosis in cardiovascular computed tomography (CT) is still challenging. The first study assessing the in-vitro stent lumen visualization of the state of the art 256-multislice CT (256-MSCT), which was performed by our research group, yielded promising results. As the applied technical approach is not suitable for daily routine, we assessed the capability of the 256-MSCT and its different reconstruction kernels for the coronary stent lumen visualization employing a clinically applicable technique in a phantom study. Results The XCD kernel showed significantly lower artificial lumen narrowing (ALN) values (overall ALN < 40%) than the other reconstruction kernels (CC, CD, XCB) irrespective of the stent caliber. The ALN of coronary stents with a diameter >3 mm was significantly lower than of stents with a smaller caliber. The ALN difference between stents with a diameter of 3 mm and smaller ones was not statistically significant. Yet, the lumen visualization of the smaller stents was impaired by a halo effect. The XCD kernel showed more constant attenuation values throughout the different stent diameters than the other reconstruction kernels. Conclusions The 256-MSCT provides a good lumen visualization of coronary stents with a diameter >3 mm. The assessment of stents with a diameter of 3 mm seems feasible but has to be validated in further studies. The clinical evaluation of smaller stents cannot be recommended so far. The XCD kernel showed the best lumen visualization and should therefore be applied in addition to the standard cardiac reconstruction kernels when assessing coronary artery stents using 256-MSCT.
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Affiliation(s)
- Florian André
- Department of Cardiology, University of Heidelberg, Im Neuenheimer Feld 410, Heidelberg 69120, Germany.
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Performance of dual source versus 256-slice multi-slice CT in the evaluation of 16 coronary artery stents. Eur J Radiol 2013; 82:601-7. [DOI: 10.1016/j.ejrad.2012.04.039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2011] [Revised: 04/13/2012] [Accepted: 04/19/2012] [Indexed: 11/21/2022]
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High-Definition Computed Tomography for Coronary Artery Stents Imaging Compared With Standard-Definition 64-Row Multidectector Computed Tomography. J Comput Assist Tomogr 2012; 36:295-300. [DOI: 10.1097/rct.0b013e318255aea0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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