Initial results of the Hyperion II DPET insert for simultaneous PET-MRI applied to atherosclerotic plaque imaging in New-Zealand white rabbits

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dc.catalogadorpva
dc.contributor.authorGebhardt, Pierre
dc.contributor.authorLavin, Begoña
dc.contributor.authorPhinikaridou, Alkystis
dc.contributor.authorMackewn, Jane E.
dc.contributor.authorHenningsson, Markus
dc.contributor.authorSchug, David
dc.contributor.authorSalomon, Andre
dc.contributor.authorMarsden, Paul K.
dc.contributor.authorSchulz, Volkmar
dc.contributor.authorBotnar, René Michael
dc.date.accessioned2025-03-17T19:14:51Z
dc.date.available2025-03-17T19:14:51Z
dc.date.issued2024
dc.description.abstractObjective. In preclinical research, in vivo imaging of mice and rats is more common than any other animal species, since their physiopathology is very well-known and many genetically altered disease models exist. Animal studies based on small rodents are usually performed using dedicated preclinical imaging systems with high spatial resolution. For studies that require animal models such as mini-pigs or New-Zealand White (NZW) rabbits, imaging systems with larger bore sizes are required. In case of hybrid imaging using positron emission tomography (PET) and magnetic resonance imaging (MRI), clinical systems have to be used, as these animal models do not typically fit in preclinical simultaneous PET-MRI scanners. Approach. In this paper, we present initial imaging results obtained with the Hyperion IID PET insert which can accommodate NZW rabbits when combined with a large volume MRI RF coil. First, we developed a rabbit-sized image quality phantom of comparable size to a NZW rabbit in order to evaluate the PET imaging performance of the insert under high count rates. For this phantom, radioactive spheres with inner diameters between 3.95 and 7.86mm were visible in a warm background with a tracer activity ratio of 4.1 to 1 and with a total 18F activity in the phantom of 58MBq at measurement start. Second, we performed simultaneous PET-MR imaging of atherosclerotic plaques in a rabbit in vivo using a single injection containing 18F-FDG for detection of inflammatory activity, and Gd-ESMA for visualization of the aortic vessel wall and plaques with MRI. Main results. The fused PET-MR images reveal 18F-FDG uptake within an active plaques with plaque thicknesses in the sub-millimeter range. Histology showed colocalization of 18F-FDG uptake with macrophages in the aortic vessel wall lesions. Significance. Our initial results demonstrate that this PET insert is a promising system for simultaneous high-resolution PET-MR atherosclerotic plaque imaging studies in NZW rabbits.
dc.fechaingreso.objetodigital2025-03-17
dc.format.extent23 páginas
dc.fuente.origenORCID
dc.identifier.doi10.1088/1361-6560/ad8c1f
dc.identifier.eissn1361-6560
dc.identifier.issn0031-9155
dc.identifier.urihttps://doi.org/10.1088/1361-6560/ad8c1f
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/102687
dc.identifier.wosidWOS:001418106700001
dc.information.autorucInstituto de Ingeniería Biológica y Médica; Botnar, René Michael; 0000-0003-2811-2509; 1015313
dc.issue.numero4
dc.language.isoen
dc.nota.accesocontenido completo
dc.publisherIOP Publishing Ltd
dc.revistaPhysics in Medicine and Biology
dc.rightsacceso abierto
dc.rights.licenseAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectPET-MRI
dc.subjectHyperion
dc.subjectAtherosclerosis
dc.subjectRabbit imaging
dc.subjectPET insert
dc.subject.ddc620
dc.subject.deweyIngenieríaes_ES
dc.subject.ods03 Good health and well-being
dc.subject.odspa03 Salud y bienestar
dc.titleInitial results of the Hyperion II DPET insert for simultaneous PET-MRI applied to atherosclerotic plaque imaging in New-Zealand white rabbits
dc.typeartículo
dc.volumen70
sipa.codpersvinculados1015313
sipa.trazabilidadORCID;2025-03-03
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