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Magnetic Resonance Imaging (MRI) is one of the most important tools in clinical diagnostics and biomedical research. The number of MRI scanners operating around the world is estimated to be approximately 20,000, and the development of contrast agents, currently used in about a third of the 50 million clinical MRI examinations performed every year, has largely contributed to this significant achievement. This completely revised and extended second edition: Includes new chapters on targeted, responsive, PARACEST and nanoparticle MRI contrast agents. Covers the basic chemistries, MR physics and the most important techniques used by chemists in the characterization of MRI agents from every angle from synthesis to safety considerations. Is written for all of those involved in the development and application of contrast agents in MRI. Presented in colour, it provides readers with true representation and easy interpretation of the images. A word from the Authors: Twelve years after the first edition published, we are convinced that the chemistry of MRI agents has a bright future. By assembling all important information on the design principles and functioning of magnetic resonance imaging probes, this book intends to be a useful tool for both experts and newcomers in the field. We hope that it helps inspire further work in order to create more efficient and specific imaging probes that will allow materializing the dream of seeing even deeper and better inside the living organisms. Reviews of the First Edition: "...attempts, for the first time, to review the whole spectrum of involved chemical disciplines in this technique..."—Journal of the American Chemical Society "...well balanced in its scope and attention to detail...a valuable addition to the library of MR scientists..."—NMR in Biomedicine
This thesis reports on essential advances in the design, synthesis and biomedical applications of multifunctional Mesoporous Silica Nanoparticles (MSNs). It provides several examples of multifunctional MSN-based drug delivery nanosystems and demonstrates successful synergistic cancer therapies combining MSNs and high-intensity focused ultrasound. The book will especially be of interest to researchers and graduate students in the fields of biomaterials, biology, chemistry, medicine and the life sciences who are working to develop new methods and technologies to combat cancer.
Magnetic Resonance Imaging (MRI) has become a prominent imaging technique in medicine.MRI contrast agents are used to increase the sensitivity of this technique.1,4,7,10-teraazacyclododecane (cyclen) is a key macrocycle used for the synthesis of Magnetic Resonance Imaging (MRI) contrast agents. Substituting the hydrogen atoms (attached to the nitrogen atoms in the ring) of cyclen with suitable groups produce stable ligands. These ligands on complexation with Ln3+ ions lead to the formation of useful chelates. Cyclen is widely synthesized via Richman and Atkins method.Recently, a new method for cancer treatment with a less side effect called photodynamic therapy (PDT) has been introduced. In this method cancer tissues are selectively destroyed without injuring the surrounding healthy cells. However, for the successful use of this method, the selection of an appropriate photosensitizer is important. Hence, it diagnosis-treat union of MRI and PDT will be significantly promoted if a new family of bi-functional agents is found, which would combine the effects of a contrast agent in MRI and of a photosensitizer in PDT. It will bring great improvement to the cancer diagnosis and treatment
Over the last decade, an unprecedented expansion in the field of nanomedicine has resulted in the development of new nanomaterials for diagnosis and therapy of various diseases such as cancer. This book covers the design, synthesis and applications of various functionally-hybridized nanomaterials for biomedical applications. It includes strategies for design and synthesis of hybrid nanomaterials, surface engineering of various nanoparticle-based hybrid nanosystems for cancer imaging and therapy, toxicity aspects of nanomaterials and the challenges in translation research of hybrid nanomaterials.
This book describes the multiple aspects of (i) preparation of the magnetic core, (ii) the stabilization with different coatings, (iii) the physico-chemical characterization and (iv) the vectorization to obtain specific nanosystems. Several bio-applications are also presented in this book. In the early days of Magnetic Resonance Imaging (MRI), paramagnetic ions were proposed as contrast agents to enhance the diagnostic quality of MR images. Since then, academic and industrial efforts have been devoted to the development of new and more efficient molecular, supramolecular and nanoparticular systems. Old concepts and theories, like paramagnetic relaxation, were revisited and exploited, leading to new scientific tracks. With their high relaxivity payload, the superparamagnetic nanoparticles are very appealing in the context of molecular imaging but challenges are still numerous: absence of toxicity, specificity, ability to cross the biological barriers, etc.
Image-based biomarkers that report on specific cell phenotypes in the body are highly valued for disease detection and monitoring cytotherapies. Towards this need, there is sustained scientific interest in fluorine-19 (19F) magnetic resonance imaging (MRI) for in vivo molecular–cellular imaging applications. The attraction of 19F tracer MRI is its ability to produce pure ‘hot-spot’ images, an absence of false-positive signals, robust quantification, and tracer safety. For molecular–cellular applications, fluorine MRI does not require a pre-scan prior to tracer administration, thus offering several advantages over metal–ion-based proton (1H) contrast-agent approaches. Key applications of 19F MRI include cell tracking, inflammation detection, and biosensing. Fluorinated imaging tracers can also serve as therapeutic agents or drug-delivery vehicles. Over the past decade, the field of 19F MRI has seen remarkable innovation in tracer designs and detection methods as well as the realization of its clinical potential. This book is an interdisciplinary compendium detailing cutting-edge science and biomedical research in the emerging field of 19F MRI and includes technical issues, such as pulse sequence considerations and limits of detection of the techniques; synthesis of novel 19F MRI tracer agents; inflammation, cancer, and stroke imaging; regenerative brain repair; theranostic nanomedicine; and clinical perspectives. The book will appeal to investigators involved in MRI physics, biomedicine, immunology, pharmacology, and probe chemistry as well as general readers.