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Journals and Conferences
PURPOSE To explore the feasibility of tracking thulium (Tm)-1,4,7,10-tetraazacyclododecane-α,α',α'',α'''-tetramethyl-1,4,7,10-tetraacetic acid (DOTMA)-labeled cells in vivo by means of highly shifted proton magnetic resonance (MR) imaging as a potential alternative to established cell-tracking methods. MATERIALS AND METHODS All animal experiments were… (More)
Contrast in magnetic resonance imaging (MRI) arises from changes in the intensity of the proton signal of water between voxels (essentially, the 3D counterpart of pixels). Differences in intervoxel intensity can be significantly enhanced with chemicals that alter the nuclear magnetic resonance (NMR) intensity of the imaged spins; this alteration can occur… (More)
RATIONALE AND OBJECTIVES Paramagnetic Ln-DOTAMGly complexes (Ln not equal La, Lu, and Gd) are the prototypes of a novel class of contrast agents for magnetic resonance imaging based on chemical exchange saturation transfer (CEST). Their ability to reduce the water signal intensity depends on the interplay of several physico-chemical properties of the agent… (More)
Magnetically oriented liposomes can be prepared by exposing unilamellar spherical systems loaded with paramagnetic lanthanide(III) complexes to hyperosmotic stress. The resulting nonspherical, lens-shaped, nanoparticles can orient within a static magnetic field, depending on the magnetic properties of their membrane bilayer. The orientation of the vesicles… (More)
The rate of axial water exchange in well-defined series of lanthanide complexes depends on the extent of second sphere hydration which is determined by complex hydrophobicity and the nature of the lanthanide ion and its counter-ion.
CEST imaging is a recently introduced MRI contrast modality based on the use of endogenous or exogenous molecules whose exchangeable proton pools transfer saturated magnetization to bulk water, thus creating negative contrast. One of the critical issues for further development of these agents is represented by their limited sensitivity in vivo. The aim of… (More)
CEST agents represent a very promising class of MRI contrast media as they encode a frequency dependence that is not like the classical relaxation-based agents. This peculiar property enables novel applications such as the detection of more than one agent in the same MR image as well as the set-up of ratiometric methods for the quantitative assessment of… (More)
3.3. Magnetic Particle Imaging 3029 4. Challenges for CEST Agents 3029 4.1. Technical Issues 3029 4.2. Chemical Issues 3031 4.3. Biological Issues 3032 5. Challenges for Heteronuclear MR Imaging 3033 5.1. F-Based Probes 3033 6. Challenges for Hyperpolarized Probes 3034 6.1. Brute Force 3034 6.2. Optical Pumping and Spin Exchange 3035 6.3. Dynamic Nuclear… (More)
The frequency-encoding property of chemical exchange saturation transfer (CEST) agents places them in a unique position among the MRI contrast agents, as it allows the visualization of more agents in the same MR image, as well as making it possible to set up innovative MRI-responsive agents. The sensitivity issue shown by molecular CEST agents (either… (More)
Improved LIPOCEST MRI contrast agents with highly shifted intraliposomal water protons were prepared by entrapping neutral polynuclear Tm(III)-based paramagnetic shift reagents in phospholipidic vesicles.