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A novel method for quantitative monitoring of transplanted islets of langerhans by positive contrast magnetic resonance imaging

Nielles-Vallespin, S
Speier, P
Masson, S
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Published in American journal of transplantation. 2011, vol. 11, no. 6, p. 1158-68
Abstract The Automatic Quantitative Ultrashort Echo Time imaging (AQUTE) protocol for serial MRI allows quantitative in vivo monitoring of iron labeled pancreatic islets of Langerhans transplanted into the liver, quantifying graft implantation and persistence in a rodent model. Rats (n = 14), transplanted with iron oxide loaded cells (0-4000 islet equivalents, IEQ), were imaged using a 3D radial ultrashort echo time difference technique (dUTE) on a Siemens MAGNETOM 3T clinical scanner up to 5 months postsurgery. In vivo 3D dUTE images gave positive contrast from labeled cells, suppressing liver signal and small vessels, allowing automatic quantification. Position of labeled islet clusters was consistent over time and quantification of hyperintense pixels correlated with the number of injected IEQs (R² = 0.898, p < 0.0001), and showed persistence over time (5 months posttransplantation). Automatic quantification was superior to standard imaging and manual counting methods, due to the uniform suppressed background and high contrast, resulting in significant timesavings, reproducibility and ease of quantification. Three-dimensional coverage of the whole liver in the absence of cardiac/respiratory artifact provided further improvement over conventional imaging. This imaging protocol reliably quantifies transplanted islet mass and has high translational potential to clinical studies of transplanted pancreatic islets.
Keywords AnimalsContrast MediaIslets of Langerhans/pathologyIslets of Langerhans TransplantationMagnetic Resonance Imaging/methodsRatsRats, Sprague-DawleyReproducibility of Results
PMID: 21564535
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Research groups Imagerie cardiaque fonctionnelle (541)
La transplantation d'îlots de Langerhans (623)
Transplantation et hépatologie (905)
Swiss National Science Foundation: PPOOB3–116901
Swiss National Science Foundation: 320030–127583
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CROWE, Lindsey et al. A novel method for quantitative monitoring of transplanted islets of langerhans by positive contrast magnetic resonance imaging. In: American journal of transplantation, 2011, vol. 11, n° 6, p. 1158-68. doi: 10.1111/j.1600-6143.2011.03559.x https://archive-ouverte.unige.ch/unige:23864

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Deposited on : 2012-11-07

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