Quantitative imaging of magnetic nanoparticles in an unshielded environment using a large AC susceptibility array

Author(s)

Soares, Guilherme ; Pinto, Leonardo ; Liebl, Maik ; Biasotti, Gabriel ; Prospero, Andre ; Stoppa, Erick ; Bakuzis, Andris ; Baffa, Oswaldo ; Wiekhorst, Frank ; Arruda Miranda, Jose Ricardo

• Document type: Journal article
• Source: JOURNAL OF BIOLOGICAL ENGINEERING; v. 16, n. 1, p. 11-pg., 2022-10-11.

Abstract

Background Non-invasive magnetic imaging techniques are necessary to assist magnetic nanoparticles in biomedical applications, mainly detecting their distribution inside the body. In Alternating Current Biosusceptometry (ACB), the magnetic nanoparticle's magnetization response under an oscillating magnetic field, which is applied through an excitation coil, is detected with a balanced detection coil system. Results We built a Multi-Channel ACB system (MC-ACB) containing nineteen pick-up coils and obtained 2D quantitative images of magnetic nanoparticle distributions by solving an inverse problem. We reconstructed the magnetic nanoparticles spatial distributions in a field of view of 14 x 14 cm(2) with a spatial resolution of 2.0 cm and sensitivity in the milligram scale. A correlation coefficient between quantitative reconstructed and nominal magnetic nanoparticle distributions above 0.6 was found for all measurements. Conclusion Besides other interesting features such as sufficient large field of view dimension for mice and rat studies, portability, and the ability to assess the quantitative magnetic nanoparticles distributions in real-time, the MC-ACB system is a promising tool for quantitative imaging of magnetic nanoparticles distributions in real-time, offering an affordable setup for easy access in clinical or laboratory environments. (AU)

• FAPESP's process: 21/09829-4 - AC Biosusceptometry: models, instrumentation and applications
• Grantee: José Ricardo de Arruda Miranda
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/11277-0 - Mapping of the distribution of magnetic nanoparticles in a model of hepatocellular carcinoma through magnetic images
• Grantee: Gabriele Martins Pereira
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 13/07699-0 - Research, Innovation and Dissemination Center for Neuromathematics - NeuroMat
• Grantee: Oswaldo Baffa Filho
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC