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Raviol J, Plet G, Langlois JB, Si-Mohamed S, Magoariec H, Pailler-Mattei C. In vivo mechanical characterization of arterial wall using an inverse analysis procedure: application on an animal model of intracranial aneurysm. R Soc Open Sci 2024; 11:231936. [PMID: 38633347 PMCID: PMC11022001 DOI: 10.1098/rsos.231936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 02/19/2024] [Accepted: 02/24/2024] [Indexed: 04/19/2024]
Abstract
Intracranial aneurysm is a pathology related to the deterioration of the arterial wall. This work is an essential part of a large-scale project aimed at providing clinicians with a non-invasive patient-specific decision support tool to facilitate the rupture risk assessment. It will lean on the link between the aneurysm shape clinically observed and a database derived from the in vivo mechanical characterization of aneurysms. To supply this database, a deformation device prototype of the arterial wall was developed. Its use coupled with medical imaging (spectral photon-counting computed tomography providing a spatial resolution down to 250 μm) is used to determine the in vivo mechanical properties of the wall based on the inverse analysis of the quantification of the wall deformation observed experimentally. This study presents the in vivo application of this original procedure to an animal model of aneurysm. The mechanical properties of the aneurysm wall identified were consistent with the literature, and the errors between the numerical and experimental results were less than 10%. Based on these parameters, this study allows the assessment of the aneurysm stress state for a known solicitation and points towards the definition of a rupture criterion.
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Affiliation(s)
- J. Raviol
- Ecole Centrale de Lyon, CNRS, ENTPE, LTDS, UMR 5513, Écully69130, France
| | - G. Plet
- Ecole Centrale de Lyon, CNRS, ENTPE, LTDS, UMR 5513, Écully69130, France
| | | | - S. Si-Mohamed
- Université de Lyon, INSA Lyon, Université Claude Bernard Lyon 1, UJM-Saint Etienne, CNRS, Inserm, CREATIS UMR 5220, U1206, F69621, Villeurbanne69100, France
- Département de Radiologie, Hôpital Louis Pradel, Hospices Civils de Lyon, Bron69677, France
| | - H. Magoariec
- Ecole Centrale de Lyon, CNRS, ENTPE, LTDS, UMR 5513, Écully69130, France
| | - C. Pailler-Mattei
- Ecole Centrale de Lyon, CNRS, ENTPE, LTDS, UMR 5513, Écully69130, France
- Université de Lyon, Université Claude Bernard Lyon 1, ISPB-Faculté de Pharmacie, Lyon69008, France
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Yankam Njiwa J, Costes N, Bouillot C, Bouvard S, Fieux S, Becker G, Levigoureux E, Kocevar G, Stamile C, Langlois JB, Bolbos R, Bonnet C, Bezin L, Zimmer L, Hammers A. Quantitative longitudinal imaging of activated microglia as a marker of inflammation in the pilocarpine rat model of epilepsy using [ 11C]-( R)-PK11195 PET and MRI. J Cereb Blood Flow Metab 2017; 37:1251-1263. [PMID: 27381824 PMCID: PMC5414902 DOI: 10.1177/0271678x16653615] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Inflammation may play a role in the development of epilepsy after brain insults. [11C]-( R)-PK11195 binds to TSPO, expressed by activated microglia. We quantified [11C]-( R)-PK11195 binding during epileptogenesis after pilocarpine-induced status epilepticus (SE), a model of temporal lobe epilepsy. Nine male rats were studied thrice (D0-1, D0 + 6, D0 + 35, D0 = SE induction). In the same session, 7T T2-weighted images and DTI for mean diffusivity (MD) and fractional anisotropy (FA) maps were acquired, followed by dynamic PET/CT. On D0 + 35, femoral arterial blood was sampled for rat-specific metabolite-corrected arterial plasma input functions (AIFs). In multiple MR-derived ROIs, we assessed four kinetic models (two with AIFs; two using a reference region), standard uptake values (SUVs), and a model with a mean AIF. All models showed large (up to two-fold) and significant TSPO binding increases in regions expected to be affected, and comparatively little change in the brainstem, at D0 + 6. Some individuals showed increases at D0 + 35. AIF models yielded more consistent increases at D0 + 6. FA values were decreased at D0 + 6 and had recovered by D0 + 35. MD was increased at D0 + 6 and more so at D0 + 35. [11C]-( R)-PK11195 PET binding and MR biomarker changes could be detected with only nine rats, highlighting the potential of longitudinal imaging studies.
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Affiliation(s)
| | - N Costes
- 2 CERMEP-Imagerie du Vivant, Lyon, France
| | - C Bouillot
- 2 CERMEP-Imagerie du Vivant, Lyon, France
| | - S Bouvard
- 2 CERMEP-Imagerie du Vivant, Lyon, France.,3 Lyon Neuroscience Research Center, University Claude Bernard Lyon 1, Lyon, France
| | - S Fieux
- 2 CERMEP-Imagerie du Vivant, Lyon, France
| | - G Becker
- 2 CERMEP-Imagerie du Vivant, Lyon, France
| | - E Levigoureux
- 3 Lyon Neuroscience Research Center, University Claude Bernard Lyon 1, Lyon, France.,4 Hospices Civils de Lyon, France
| | | | | | | | - R Bolbos
- 3 Lyon Neuroscience Research Center, University Claude Bernard Lyon 1, Lyon, France
| | - C Bonnet
- 3 Lyon Neuroscience Research Center, University Claude Bernard Lyon 1, Lyon, France
| | - L Bezin
- 3 Lyon Neuroscience Research Center, University Claude Bernard Lyon 1, Lyon, France
| | - L Zimmer
- 2 CERMEP-Imagerie du Vivant, Lyon, France.,3 Lyon Neuroscience Research Center, University Claude Bernard Lyon 1, Lyon, France.,4 Hospices Civils de Lyon, France
| | - A Hammers
- 1 Neurodis Foundation, Lyon, France.,6 Division of Imaging Sciences and Biomedical Engineering, King's College London & Guy's and St Thomas' PET Centre, King's College London, London, UK
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Rognant N, Guebre-Egziabher F, Bacchetta J, Janier M, Hiba B, Langlois JB, Gadet R, Laville M, Juillard L. Evolution of renal oxygen content measured by BOLD MRI downstream a chronic renal artery stenosis. Nephrol Dial Transplant 2010; 26:1205-10. [DOI: 10.1093/ndt/gfq538] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Boulocher C, Chereul E, Langlois JB, Armenean M, Duclos ME, Viguier E, Roger T, Vignon E. Non-invasive in vivo quantification of the medial tibial cartilage thickness progression in an osteoarthritis rabbit model with quantitative 3D high resolution micro-MRI. Osteoarthritis Cartilage 2007; 15:1378-87. [PMID: 17576081 DOI: 10.1016/j.joca.2007.04.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2006] [Accepted: 04/24/2007] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To develop a quantitative non-invasive in vivo three-dimensional (3D) high resolution (HR) micro-magnetic resonance imaging (microMRI) protocol to measure the medial tibial cartilage thickness (MT.ThC) in the normal rabbit and in the anterior cruciate ligament transection (ACLT) rabbit model of osteoarthritis and quantify the progression of MT.ThC. METHODS The left knee of 10 control and 40 operated rabbits was imaged in vivo with a 7T microMRI system at 3 and 5 months after ACLT. A 3D fast low angle short (FLASH) fat-suppressed MRI protocol was implemented leading to 44x176 microm(3) spatial resolution and to 44 microm(3) isotropic voxel after cubic interpolation. Semi-automatic MT.ThC measurements were made in 3D, in four different locations, in vivo and longitudinally in both groups. At 5 months, gross macroscopy, visual analogical evaluation of the cartilage and histology were compared to the MR-based MT.ThC. RESULTS At 3 and 5 months, the MT.ThC measured in the minimum interbone distance area was the thinnest MR-based MT.ThC. It was significantly lower in the operated group and among the four evaluated MT.ThC, it was the most discriminative between the normal and the operated groups (P<0.05). The MT.ThC measured in the minimum interbone distance area was also the most sensitive to change in the operated group (66.4% MT.ThC loss, P=0.003) while no significant changes were observed in the control group. CONCLUSION Quantitative 3D HR microMRI allowed for non-invasive longitudinal MT.ThC measurements in four different locations in both the normal and the operated rabbits. We concluded the MT.ThC measured in the minimum interbone distance area reflected the severity of the disease and was the most effective to measure the progression of the medial tibial cartilage destruction.
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Affiliation(s)
- C Boulocher
- Université de Lyon, UR RTI2B, Lyon F-69003, France.
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