title: PEGylated NaHoF4 nanoparticles as contrast agents for both X-ray computed tomography and ultra-high field magnetic resonance imaging.
abstract: It is well-known that multimodal imaging can integrate the advantages of different imaging modalities by overcoming their individual limitations. As ultra-high field magnetic resonance imaging (MRI) will be inevitably used in future MRI/X-ray computed tomography (CT) scanner, it is highly expected to develop high-performance nano-contrast agents for ultra-high field MR and CT dual-modality imaging, which has not been reported yet. Moreover, specific behavior of nano-contrast agents for ultra-high field MRI is a challenging work and still remains unknown. Herein, a novel type of NaHoF4 nanoparticles (NPs) with varied particle sizes were synthesized and explored as high-performance dual-modality contrast agents for ultra-high field MR and CT imaging. The specific X-ray absorption and MR relaxivity enhancements with varied nanoparticle diameters (3 nm, 7 nm, 13 nm and 29 nm) under different magnetic field (1.5/3.0/7.0 T) are investigated. Based on experimental results and theoretical analysis, the Curie and dipolar relaxation mechanisms of NaHoF4 NPs are firstly separated. Our results will greatly promote the future medical translational development of the NaHoF4 nano-contrast agents for ultra-high field MR/CT dual-modality imaging applications.
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
authors.forename: Dalong
authors.initials: D
authors.lastname: Ni
authors.affiliation: Department of Radiology, Huashan Hospital, Fudan University, Shanghai, 200040, China.
authors.forename: Jiawen
authors.initials: J
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China. Electronic address: wbbu@mail.sic.ac.cn.
authors.forename: Wenbo
authors.initials: W
authors.lastname: Bu
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China. Electronic address: zwyao@fudan.edu.cn.
authors.forename: Zhenwei
authors.initials: Z
authors.lastname: Yao
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
authors.forename: Huaiyong
authors.initials: H
authors.lastname: Xing
authors.affiliation: Department of Radiology, Huashan Hospital, Fudan University, Shanghai, 200040, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Radiology, Huashan Hospital, Fudan University, Shanghai, 200040, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Duan
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
authors.forename: Wenpei
authors.initials: W
authors.lastname: Fan
authors.affiliation: Department of Radiology, Huashan Hospital, Fudan University, Shanghai, 200040, China.
authors.forename: Xiaoyuan
authors.initials: X
authors.lastname: Feng
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China. Electronic address: jlshi@mail.sic.ac.cn.
authors.forename: Jianlin
authors.initials: J
authors.lastname: Shi
mesh_terms: D003287:Contrast Media; D006695:Holmium / Q000737:chemistry*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D046529:Microscopy, Electron, Transmission; D064847:Multimodal Imaging; D053758:Nanoparticles; D011092:Polyethylene Glycols / Q000737:chemistry*; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D003287:Contrast Media; D011092:Polyethylene Glycols; D006695:Holmium
keywords: CT; Dual-modality imaging; Holmium; Relaxivity mechanism; Ultra-high field MRI