AI Article Synopsis
- The study focuses on a new MRI-compatible injector designed to facilitate targeted intra-arterial therapies using magnetic drug-eluting beads (MDEBs).
- The injector features peristaltic pumps, an optical counter, and a magnetic trap, optimizing for the challenges posed by strong MRI magnetic fields.
- It demonstrated success in forming and injecting precise aggregates of magnetic microparticles, achieving an 82% success rate in reaching targeted blood vessel subbranches during tests.
Article Abstract
Objective: Dipole field navigation and magnetic resonance navigation exploit B magnetic fields and imaging gradients for targeted intra-arterial therapies by using magnetic drug-eluting beads (MDEBs). The strong magnetic strength (1.5 or 3 T) of clinical magnetic resonance imaging (MRI) scanners is the main challenge preventing the formation and controlled injection of specific-sized particle aggregates. Here, an MRI-compatible injector is proposed to solve the above problem.
Methods: The injector consists of two peristaltic pumps, an optical counter, and a magnetic trap. The magnetic property of microparticles, the magnetic compatibility of different parts within the injector, and the field distribution of the MRI system were studied to determine the optimal design and setup of the injector. The performance was investigated through 30.4-emu/g biocompatible magnetic microparticles (230 ± 35 μm in diameter) corresponding to the specifications needed for trans-arterial chemoembolization in human adults.
Results: The system can form aggregates containing 20 to 60 microparticles with a precision of six particles. The corresponding aggregate lengths range from 1.6 to 3.2 mm. Based on the injections of 50 MRI-visible boluses into a phantom which mimics realistic physiological conditions, 82% of the aggregates successfully reached subbranches.
Conclusion And Significance: This system has the capability to operate within the strong magnetic field of a clinical 3-T MRI, to form proper particle aggregates and to automatically inject these aggregates into the MRI bore. Moreover, the versatility of the proposed injector renders it suitable for selective injections of MDEBs during MR-guided embolization procedures.
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| http://dx.doi.org/10.1109/TBME.2018.2889000 | DOI Listing |
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