Magnetic induction tomography (MIT) is a tomographic technique capable of imaging the passive electromagnetic properties of an object. It has the advantages of being contact-less and non-invasive, as the process involves interrogating the electromagnetic field of the imaging subject. As such, the potential applications of MIT are broad, with various domains of operation including biomedicine, industrial process tomography and nondestructive evaluation. Consequently, there is a rich-yet underexploredresearch landscape for the practical applications of MIT. The aim of this review is to provide a non-exhaustive overview of this landscape. The fundamental principles of MIT are discussed, alongside the instrumentation and techniques necessary to obtain and interpret MIT measurements.
The development of a rapid and effective hemostatic dressing is highly desired in the treatment of hemorrhagic wounds. In this study, sponges with Janus character are developed using cellulose nanofibers (CNFs) that exhibit materials facets of different wettability characteristics using heterogeneous mixing and freeze−drying. The bonding of the interface between the hydrophilic and hydrophobic facets is achieved by using interpenetrating chemical cross‐linking between CNFs and organosilanes. The hydrophilic layer absorbs water from blood and works synergistically with the inherent hemostatic chitosan‐rich complementary layer to accelerate blood clotting, displaying both active and passive hemostatic mechanisms. The hydrophobic layer prevents blood penetration into the construct and exerts proper pressure on the wound. Compared with the hydrophilic control samples and commercial gauzes, the Janus sponges can achieve effective bleeding control with nearly 50% less blood loss in a femoral artery injury model and prolong the survival time in a carotid artery injury model. Compared with the only hydrophilic layer, the time to hemostasis of Janus sponge are reduced from 165 ± 20 to 131 ± 26 s in femoral artery injury model and from 102 ± 21 to 83 ± 15 s in liver femoral artery injury model.
Pipelines are the most common apparatus in industries; therefore, the need for inspection during the manufacturing, construction and the operation stage is inevitable and invaluable. Magnetic Induction Tomography (MIT) is a new type of tomography technique that is sensitive to the electrical conductivity of objects. It has been shown that the MIT technique is appropriate for imaging materials with high electrical conductivity contrasts; hence, the majority of the MIT systems were designed for detecting metallic objects. In this paper, MIT technique was proposed for pipeline inspection. Structural damages of the outer surface of the pipe were considered in this study. Nonetheless, it is challenging to use the traditional MIT pixel based reconstruction method (PBRM) as a suitable pipelines inspection tool because of the limited resolution. A narrowband pass filtering method (NPFM) of imaging pipe geometry was developed as a suitable image reconstruction method. The proposed method can overcome the resolution limitations and produce useful information of the pipe structure. This paper shows the comparative results from the novel NPFM and from traditional PBRM. While the PBRM fails to detect damages in outer structure of the pipe the NPFM successfully indentifies these damages. The method has been verified using experimental data from very challenging test samples. It is well known that using a coil array with an imaging region of 100 mm the PBRM based MIT can retrieve information with accuracy of about 10 mm (about 10%). With proposed NPFM the information on a resolution of 2 mm (which is about 2%) can be detected using the same measurement data.
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