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Item type:Publication, Access status: without files , Towards picogram detection of superparamagnetic iron-oxide particles using a gradiometric receive coil(Jenny Stanford Publishing, 2026-01-01); ; ; ; Superparamagnetic iron-oxide nanoparticles can be used in medical applications like vascular or targeted imaging. Magnetic particle imaging (MPI) is a promising tomographic imaging technique that allows visualizing the 3D nanoparticle distribution concentration in a non-invasive manner. The two main strengths of MPI are high temporal resolution and high sensitivity. While the first has been proven in the assessment of dynamic processes like cardiac imaging, it is unknown how far the detection limit of MPI can be lowered. Within this work, we will present a highly sensitive gradiometric receive-coil unit combined with a noise-matching network tailored for the imaging of mice. The setup is capable of detecting 5 ng of iron in-vitro with an acquisition time of 2.14 sec. In terms of iron concentration we are able to detect 156 µg/L marking the lowest value that has been reported for an MPI scanner so far. In-vivo MPI mouse images of a 512 ng bolus and a 21.5 ms acquisition time allow for capturing the flow of an intravenously injected tracer through the heart of a mouse. Since it has been rather difficult to compare detection limits across MPI publications we propose guidelines to improve the comparability of future MPI studies.Publicationtype: Book Part3 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , First dedicated balloon catheter for magnetic particle imaging(IEEE, 2022-06-16); ; ; ; Vascular interventions are a promising application of Magnetic Particle Imaging enabling a high spatial and temporal resolution without using ionizing radiation. The possibility to visualize the vessels as well as the devices, especially at the same time using multi-contrast approaches, enables a higher accuracy for diagnosis and treatment of vascular diseases. Different techniques to make devices MPI visible have been introduced so far, such as varnish markings or filling of balloons. However, all approaches include challenges for in vivo applications, such as the stability of the varnishing or the visibility of tracer filled balloons in deflated state. In this contribution, we present for the first time a balloon catheter that is molded from a granulate incorporating nanoparticles and can be visualized sufficiently in MPI. Computed tomography is used to show the homogeneous distribution of particles within the material. Safety measurements confirm that the incorporation of nanoparticles has no negative effect on the balloon. A dynamic experiment is performed to show that the inflation as well as deflation of the balloon can be imaged with MPI.Publicationtype: Journal ArticleScopus© Citations 6 23 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , First complex trials using a dedicated balloon catheter for magnetic particle imaging(Infinite Science Publishing, 2022-03-21); ; ; ; A recent work introduced a balloon catheter from a polymer mixed with magnetic nanoparticles that was visible in magnetic particle imaging (MPI) in initial trials. In this work, dynamic multi-patch and multi-contrast experiments were performed to validate the applicability of the balloon catheter for complex application scenarios in MPI. In both cases, the balloon was successfully imaged, although there are limitations in resolution and dynamic imaging range.Publicationtype: Journal Article53 81 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Towards picogram detection of superparamagnetic iron-oxide particles using a gradiometric receive coil(Nature Publishing Group, 2017-07-31); ; ; ; Superparamagnetic iron-oxide nanoparticles can be used in medical applications like vascular or targeted imaging. Magnetic particle imaging (MPI) is a promising tomographic imaging technique that allows visualizing the 3D nanoparticle distribution concentration in a non-invasive manner. The two main strengths of MPI are high temporal resolution and high sensitivity. While the first has been proven in the assessment of dynamic processes like cardiac imaging, it is unknown how far the detection limit of MPI can be lowered. Within this work, we will present a highly sensitive gradiometric receive-coil unit combined with a noise-matching network tailored for the imaging of mice. The setup is capable of detecting 5 ng of iron in-vitro with an acquisition time of 2.14 sec. In terms of iron concentration we are able to detect 156 μg/L marking the lowest value that has been reported for an MPI scanner so far. In-vivo MPI mouse images of a 512 ng bolus and a 21.5 ms acquisition time allow for capturing the flow of an intravenously injected tracer through the heart of a mouse. Since it has been rather difficult to compare detection limits across MPI publications we propose guidelines to improve the comparability of future MPI studies.Publicationtype: Journal Article309 416