Creating a good image: A probe for combined positron emission tomography (PET) and magnetic resonance imaging (MRI) has high colloidal stability and demonstrates facile conjugation ability. Sentinel lymph nodes are clearly identified in the fusion image (see picture; I: injection site) because of the complementary nature of the techniques, which makes accurate anatomical information and fault‐free diagnosis possible.

Creating a good image: A probe for combined positron emission tomography (PET) and magnetic resonance imaging (MRI) has high colloidal stability and demonstrates facile conjugation ability. Sentinel lymph nodes are clearly identified in the fusion image (see picture; I: injection site) because of the complementary nature of the techniques, which makes accurate anatomical information and fault‐free diagnosis possible.

A highly effective synthetic route for TE2A was developed and the (64)Cu-labeled TE2A complexes showed higher kinetic inertness and faster clearance than most commonly used TETA analogs.

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A facile method of preparing triple‐modality, optical–nuclear–magnetic imaging probes using radiolabeled superparamagnetic nanoparticles is developed. Cerenkov luminescence imaging based on radionuclides showed great potential as a new optical imaging modality. The complementary nature of the optical/PET/MR hybrid nanoprobes facilitated non‐invasive differentiation between tumor‐metastasized sentinel lymph nodes (SLNs) and tumor‐free SLNs.

Relaxivity tuning of nanomaterials with the intrinsic T- T dual-contrast ability has great potential for MRI applications. Until now, the relaxivity tuning of T and T dual-modal MRI nanoprobes has been accomplished through the dopant, size, and morphology of the nanoprobes, leaving room for bioapplications. However, a surface engineering method for the relaxivity tuning was seldom reported. Here, we report the novel relaxivity tuning method based on the surface engineering of dual-mode T- T MRI nanoprobes (DMNPs), along with protein interaction monitoring with the DMNPs as a potential biosensor application. Core nanoparticles (NPs) of europium-doped iron oxide (EuIO) are prepared by a thermal decomposition method. As surface materials, citrate (Cit), alendronate (Ale), and poly(maleic anhydride- alt-1-octadecene)/poly(ethylene glycol) (PP) are employed for the relaxivity tuning of the NPs based on surface engineering, resulting in EuIO-Cit, EuIO-Ale, and EuIO-PP, respectively. The key achievement of the current study is that the surface materials of the DMNP have significant impacts on the r and r relaxivities. The correlation between the hydrophobicity of the surface material and longitudinal relaxivity ( r) of EuIO NPs presents an exponential decay feature. The r relaxivity of EuIO-Cit is 13.2-fold higher than that of EuIO-PP. EuIO can act as T- T dual-modal (EuIO-Cit) or T-dominated MRI contrast agents (EuIO-PP) depending on the surface engineering. The feasibility of using the resulting nanosystem as a sensor for environmental changes, such as albumin interaction, was also explored. The albumin interaction on the DMNP shows both T and T relaxation time changes as mutually confirmative information. The relaxivity tuning approach based on the surface engineering may provide an insightful strategy for bioapplications of DMNPs and give a fresh impetus for the development of novel stimuli-responsive MRI nanoplatforms with T and T dual-modality for various biomedical applications.

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