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Maguire ML, McAndrew DJ, Lake HA, Ostrowski PJ, Zervou S, Neubauer S, Lygate CA, Schneider JE. Synergistic effect on cardiac energetics by targeting the creatine kinase system: in vivo application of high-resolution 31P-CMRS in the mouse. J Cardiovasc Magn Reson 2023; 25:6. [PMID: 36740688 PMCID: PMC9900916 DOI: 10.1186/s12968-023-00911-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 01/05/2023] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Phosphorus cardiovascular magnetic resonance spectroscopy (31P-CMRS) has emerged as an important tool for the preclinical assessment of myocardial energetics in vivo. However, the high rate and diminutive size of the mouse heart is a challenge, resulting in low resolution and poor signal-to-noise. Here we describe a refined high-resolution 31P-CMRS technique and apply it to a novel double transgenic mouse (dTg) with elevated myocardial creatine and creatine kinase (CK) activity. We hypothesised a synergistic effect to augment energetic status, evidenced by an increase in the ratio of phosphocreatine-to-adenosine-triphosphate (PCr/ATP). METHODS AND RESULTS Single transgenic Creatine Transporter overexpressing (CrT-OE, n = 7) and dTg mice (CrT-OE and CK, n = 6) mice were anaesthetised with isoflurane to acquire 31P-CMRS measurements of the left ventricle (LV) utilising a two-dimensional (2D), threefold under-sampled density-weighted chemical shift imaging (2D-CSI) sequence, which provided high-resolution data with nominal voxel size of 8.5 µl within 70 min. (1H-) cine-CMR data for cardiac function assessment were obtained in the same imaging session. Under a separate examination, mice received invasive haemodynamic assessment, after which tissue was collected for biochemical analysis. Myocardial creatine levels were elevated in all mouse hearts, but only dTg exhibited significantly elevated CK activity, resulting in a 51% higher PCr/ATP ratio in heart (3.01 ± 0.96 vs. 2.04 ± 0.57-mean ± SD; dTg vs. CrT-OE), that was absent from adjacent skeletal muscle. No significant differences were observed for any parameters of LV structure and function, confirming that augmentation of CK activity does not have unforeseen consequences for the heart. CONCLUSIONS We have developed an improved 31P-CMRS methodology for the in vivo assessment of energetics in the murine heart which enabled high-resolution imaging within acceptable scan times. Mice over-expressing both creatine and CK in the heart exhibited a synergistic elevation in PCr/ATP that can now be tested for therapeutic potential in models of chronic heart failure.
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Affiliation(s)
- Mahon L Maguire
- Centre for Preclinical Imaging, University of Liverpool, Liverpool, UK
| | - Debra J McAndrew
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Hannah A Lake
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Philip J Ostrowski
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Sevasti Zervou
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Stefan Neubauer
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
- British Heart Foundation Centre for Research Excellence, University of Oxford, Oxford, UK
| | - Craig A Lygate
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK.
- British Heart Foundation Centre for Research Excellence, University of Oxford, Oxford, UK.
| | - Jurgen E Schneider
- Experimental and Preclinical Imaging Centre (ePIC), Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, UK.
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2
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Hammouda K, Khalifa F, Abdeltawab H, Elnakib A, Giridharan GA, Zhu M, Ng CK, Dassanayaka S, Kong M, Darwish HE, Mohamed TMA, Jones SP, El-Baz A. A New Framework for Performing Cardiac Strain Analysis from Cine MRI Imaging in Mice. Sci Rep 2020; 10:7725. [PMID: 32382124 PMCID: PMC7205890 DOI: 10.1038/s41598-020-64206-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 04/13/2020] [Indexed: 01/17/2023] Open
Abstract
Cardiac magnetic resonance (MR) imaging is one of the most rigorous form of imaging to assess cardiac function in vivo. Strain analysis allows comprehensive assessment of diastolic myocardial function, which is not indicated by measuring systolic functional parameters using with a normal cine imaging module. Due to the small heart size in mice, it is not possible to perform proper tagged imaging to assess strain. Here, we developed a novel deep learning approach for automated quantification of strain from cardiac cine MR images. Our framework starts by an accurate localization of the LV blood pool center-point using a fully convolutional neural network (FCN) architecture. Then, a region of interest (ROI) that contains the LV is extracted from all heart sections. The extracted ROIs are used for the segmentation of the LV cavity and myocardium via a novel FCN architecture. For strain analysis, we developed a Laplace-based approach to track the LV wall points by solving the Laplace equation between the LV contours of each two successive image frames over the cardiac cycle. Following tracking, the strain estimation is performed using the Lagrangian-based approach. This new automated system for strain analysis was validated by comparing the outcome of these analysis with the tagged MR images from the same mice. There were no significant differences between the strain data obtained from our algorithm using cine compared to tagged MR imaging. Furthermore, we demonstrated that our new algorithm can determine the strain differences between normal and diseased hearts.
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Affiliation(s)
- K Hammouda
- BioImaging Laboratory, Department of Bioengineering, University of Louisville, Louisville, KY, USA
| | - F Khalifa
- BioImaging Laboratory, Department of Bioengineering, University of Louisville, Louisville, KY, USA
| | - H Abdeltawab
- BioImaging Laboratory, Department of Bioengineering, University of Louisville, Louisville, KY, USA
| | - A Elnakib
- Electronics and Communications Engineering Department, Faculty of Engineeering, Mansoura University, Mansoura, Egypt
| | - G A Giridharan
- BioImaging Laboratory, Department of Bioengineering, University of Louisville, Louisville, KY, USA
| | - M Zhu
- Department of Radiology, Department of Medicine, University of Louisville, Louisville, KY, USA
| | - C K Ng
- Department of Radiology, Department of Medicine, University of Louisville, Louisville, KY, USA
| | - S Dassanayaka
- Diabetes and Obesity Center, Department of Medicine, University of Louisville, Louisville, KY, USA
| | - M Kong
- Department of Bioinformatics and Biostatistics, SPHIS, University of Louisville, Louisville, KY, USA
| | - H E Darwish
- Mathematics Department, Faculty of Science, Mansoura University, Mansoura, Egypt
| | - T M A Mohamed
- Diabetes and Obesity Center, Department of Medicine, University of Louisville, Louisville, KY, USA
- Division of Cardiovascular Medicine, Department of Medicine, University of Louisville, Louisville, KY, USA
| | - S P Jones
- Diabetes and Obesity Center, Department of Medicine, University of Louisville, Louisville, KY, USA
| | - A El-Baz
- BioImaging Laboratory, Department of Bioengineering, University of Louisville, Louisville, KY, USA.
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3
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Wilson AJ, Wang VY, Sands GB, Young AA, Nash MP, LeGrice IJ. Increased cardiac work provides a link between systemic hypertension and heart failure. Physiol Rep 2017; 5:5/1/e13104. [PMID: 28082430 PMCID: PMC5256162 DOI: 10.14814/phy2.13104] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 12/06/2016] [Accepted: 11/29/2016] [Indexed: 11/24/2022] Open
Abstract
The spontaneously hypertensive rat (SHR) is an established model of human hypertensive heart disease transitioning into heart failure. The study of the progression to heart failure in these animals has been limited by the lack of longitudinal data. We used MRI to quantify left ventricular mass, volume, and cardiac work in SHRs at age 3 to 21 month and compared these indices to data from Wistar-Kyoto (WKY) controls. SHR had lower ejection fraction compared with WKY at all ages, but there was no difference in cardiac output at any age. At 21 month the SHR had significantly elevated stroke work (51 ± 3 mL.mmHg SHR vs. 24 ± 2 mL.mmHg WKY; n = 8, 4; P < 0.001) and cardiac minute work (14.2 ± 1.2 L.mmHg/min SHR vs. 6.2 ± 0.8 L.mmHg/min WKY; n = 8, 4; P < 0.001) compared to control, in addition to significantly larger left ventricular mass to body mass ratio (3.61 ± 0.15 mg/g SHR vs. 2.11 ± 0.008 mg/g WKY; n = 8, 6; P < 0.001). SHRs showed impaired systolic function, but developed hypertrophy to compensate and successfully maintained cardiac output. However, this was associated with an increase in cardiac work at age 21 month, which has previously demonstrated fibrosis and cell death. The interplay between these factors may be the mechanism for progression to failure in this animal model.
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Affiliation(s)
- Alexander J Wilson
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand .,Department of Physiology, University of Auckland, Auckland, New Zealand
| | - Vicky Y Wang
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Gregory B Sands
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand.,Department of Physiology, University of Auckland, Auckland, New Zealand
| | - Alistair A Young
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand.,Department of Anatomy and Medical Imaging, University of Auckland, Auckland, New Zealand
| | - Martyn P Nash
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand.,Department of Engineering Science, University of Auckland, Auckland, New Zealand
| | - Ian J LeGrice
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand.,Department of Physiology, University of Auckland, Auckland, New Zealand
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4
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Odille F, Bustin A, Liu S, Chen B, Vuissoz P, Felblinger J, Bonnemains L. Isotropic 3
D
cardiac cine
MRI
allows efficient sparse segmentation strategies based on 3
D
surface reconstruction. Magn Reson Med 2017; 79:2665-2675. [DOI: 10.1002/mrm.26923] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 08/04/2017] [Accepted: 08/28/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Freddy Odille
- IADI, INSERM U947 and Université de LorraineNancy France
- CIC‐IT 1433, INSERM, CHRU de Nancy and Université de LorraineNancy France
| | - Aurélien Bustin
- IADI, INSERM U947 and Université de LorraineNancy France
- Technische Universität München, Department of Computer ScienceMunich Germany
- GE Global Research Center, General ElectricMunich Germany
| | - Shufang Liu
- IADI, INSERM U947 and Université de LorraineNancy France
- Technische Universität München, Department of Computer ScienceMunich Germany
- GE Global Research Center, General ElectricMunich Germany
| | - Bailiang Chen
- CIC‐IT 1433, INSERM, CHRU de Nancy and Université de LorraineNancy France
| | | | - Jacques Felblinger
- IADI, INSERM U947 and Université de LorraineNancy France
- CIC‐IT 1433, INSERM, CHRU de Nancy and Université de LorraineNancy France
| | - Laurent Bonnemains
- IADI, INSERM U947 and Université de LorraineNancy France
- Department of Cardiothoracic SurgeryCHU Strasbourg and University of StrasbourgStrasbourg France
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5
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Han JC, Barrett CJ, Taberner AJ, Loiselle DS. Does reduced myocardial efficiency in systemic hypertensive-hypertrophy correlate with increased left-ventricular wall thickness? Hypertens Res 2015; 38:530-8. [PMID: 25787044 DOI: 10.1038/hr.2015.37] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 02/02/2015] [Accepted: 02/14/2015] [Indexed: 12/19/2022]
Abstract
Elevated systemic blood pressure, and the attendant development of pathologic left ventricular (LV) hypertrophy, ultimately culminates in heart failure and death. In clinical studies, a reduction of myocardial efficiency has been implicated in systemic hypertensive-hypertrophy. However, it is uncertain whether reduced efficiency correlates with LV wall thickness. Hence, we performed experiments on isolated working hearts of spontaneously hypertensive rats (SHRs)-a widely-used experimental model of human hypertensive-hypertrophy. We contrasted their mechanoenergetic performance with that of Wistar controls at two ages: Adult (9 months) and Aged (post-18 months). The use of animal hearts allowed us to perform experiments over a wide range of afterloads. We found that mechanoenergetic performance (coronary and aortic flows, work output and oxygen consumption) declined with age. The peak efficiency of the Adult SHR was essentially similar to that of Control, but that for the Aged SHR was lower, compared with that of age-matched Wistar rats. All variables, including peak efficiency, obtained from the failing Aged SHR hearts (which also developed right ventricular hypertrophy), were greatly reduced. Our data reveal that peak efficiency of the Aged SHR, upon transitioning from compensated hypertrophy to failure, diminishes sharply, arising from compromised flows-both aortic and coronary. We further show that the reduction of myocardial efficiency in hypertensive-hypertrophy does not correlate with LV wall thickness, but instead is inversely correlated with whole-heart mass. The latter relation may serve as a prognostic and diagnostic tool in the clinical setting.
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Affiliation(s)
- June-Chiew Han
- Auckland Bioengineering Institute, The University of Auckland, Auckland, New Zealand
| | - Carolyn J Barrett
- Department of Physiology, The University of Auckland, Auckland, New Zealand
| | - Andrew J Taberner
- 1] Auckland Bioengineering Institute, The University of Auckland, Auckland, New Zealand [2] Department of Engineering Science, The University of Auckland, Auckland, New Zealand
| | - Denis S Loiselle
- 1] Auckland Bioengineering Institute, The University of Auckland, Auckland, New Zealand [2] Department of Physiology, The University of Auckland, Auckland, New Zealand
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7
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Pennell DJ, Baksi AJ, Carpenter JP, Firmin DN, Kilner PJ, Mohiaddin RH, Prasad SK. Review of Journal of Cardiovascular Magnetic Resonance 2012. J Cardiovasc Magn Reson 2013; 15:76. [PMID: 24006874 PMCID: PMC3847143 DOI: 10.1186/1532-429x-15-76] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 08/22/2013] [Indexed: 02/07/2023] Open
Abstract
There were 90 articles published in the Journal of Cardiovascular Magnetic Resonance (JCMR) in 2012, which is an 8% increase in the number of articles since 2011. The quality of the submissions continues to increase. The editors are delighted to report that the 2011 JCMR Impact Factor (which is published in June 2012) has risen to 4.44, up from 3.72 for 2010 (as published in June 2011), a 20% increase. The 2011 impact factor means that the JCMR papers that were published in 2009 and 2010 were cited on average 4.44 times in 2011. The impact factor undergoes natural variation according to citation rates of papers in the 2 years following publication, and is significantly influenced by highly cited papers such as official reports. However, the progress of the journal's impact over the last 5 years has been impressive. Our acceptance rate is approximately 25%, and has been falling as the number of articles being submitted has been increasing. In accordance with Open-Access publishing, the JCMR articles go on-line as they are accepted with no collating of the articles into sections or special thematic issues. For this reason, the Editors have felt that it is useful once per calendar year to summarize the papers for the readership into broad areas of interest or theme, so that areas of interest can be reviewed in a single article in relation to each other and other recent JCMR articles. The papers are presented in broad themes and set in context with related literature and previously published JCMR papers to guide continuity of thought in the journal. We hope that you find the open-access system increases wider reading and citation of your papers, and that you will continue to send your quality manuscripts to JCMR for publication.
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Affiliation(s)
- Dudley J Pennell
- Cardiovascular Biomedical Research Unit, Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- Imperial College, London, UK
| | - A John Baksi
- Cardiovascular Biomedical Research Unit, Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- Imperial College, London, UK
| | - John Paul Carpenter
- Cardiovascular Biomedical Research Unit, Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- Imperial College, London, UK
| | - David N Firmin
- Cardiovascular Biomedical Research Unit, Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- Imperial College, London, UK
| | - Philip J Kilner
- Cardiovascular Biomedical Research Unit, Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- Imperial College, London, UK
| | - Raad H Mohiaddin
- Cardiovascular Biomedical Research Unit, Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- Imperial College, London, UK
| | - Sanjay K Prasad
- Cardiovascular Biomedical Research Unit, Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- Imperial College, London, UK
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8
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Pennell DJ, Carpenter JP, Firmin DN, Kilner PJ, Mohiaddin RH, Prasad SK. Review of Journal of Cardiovascular Magnetic Resonance 2011. J Cardiovasc Magn Reson 2012; 14:78. [PMID: 23158097 PMCID: PMC3519784 DOI: 10.1186/1532-429x-14-78] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Accepted: 11/08/2012] [Indexed: 12/15/2022] Open
Abstract
There were 83 articles published in the Journal of Cardiovascular Magnetic Resonance (JCMR) in 2011, which is an 11% increase in the number of articles since 2010. The quality of the submissions continues to increase. The editors had been delighted with the 2010 JCMR Impact Factor of 4.33, although this fell modestly to 3.72 for 2011. The impact factor undergoes natural variation according to citation rates of papers in the 2 years following publication, and is significantly influenced by highly cited papers such as official reports. However, we remain very pleased with the progress of the journal's impact over the last 5 years. Our acceptance rate is approximately 25%, and has been falling as the number of articles being submitted has been increasing. In accordance with Open-Access publishing, the JCMR articles go on-line as they are accepted with no collating of the articles into sections or special thematic issues. For this reason, the Editors feel it is useful to summarize the papers for the readership into broad areas of interest or theme, which we feel would be useful, so that areas of interest from the previous year can be reviewed in a single article in relation to each other and other recent JCMR articles. The papers are presented in broad themes and set in context with related literature and previously published JCMR papers to guide continuity of thought in the journal. We hope that you find the open-access system increases wider reading and citation of your papers, and that you will continue to send your quality manuscripts to JCMR for publication.
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Affiliation(s)
- Dudley J Pennell
- CMR Unit Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ, UK
| | - John Paul Carpenter
- CMR Unit Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ, UK
| | - David N Firmin
- CMR Unit Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ, UK
| | - Philip J Kilner
- CMR Unit Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ, UK
| | - Raad H Mohiaddin
- CMR Unit Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ, UK
| | - Sanjay K Prasad
- CMR Unit Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, Exhibition Road, London, SW7 2AZ, UK
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Gray GA, White CI, Thomson A, Kozak A, Moran C, Jansen MA. Imaging the healing murine myocardial infarct in vivo: ultrasound, magnetic resonance imaging and fluorescence molecular tomography. Exp Physiol 2012; 98:606-13. [PMID: 23064510 DOI: 10.1113/expphysiol.2012.064741] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Improved understanding of the processes involved in infarct healing is required for identification of novel therapeutic targets to limit infarct expansion and consequent long-term ventricular remodelling after myocardial infarction. Infarct healing can be modelled effectively in murine models of coronary artery ligation. While imaging the murine heart is challenging due to its size and high rate of contraction, advances in preclinical imaging now permit accurate assessment of myocardial structure and function in vivo after myocardial infarction. Furthermore, rapid development of a range of molecular probes for use in a number of imaging modalities allows more detailed in vivo analysis of processes, including inflammation, fibrosis and angiogenesis. Here we consider the practical application of in vivo imaging by magnetic resonance imaging, ultrasound and fluorescence molecular tomography for assessment of infarct healing in the mouse.
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Affiliation(s)
- Gillian A Gray
- British Heart Foundation/University Centre for Cardiovascular Science, University of Edinburgh, 47 Little France Crescent, Edinburgh, EH16 4TJ, UK.
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