Phase-based stimulated emission depletion (pSTED) magnetic particle imaging
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arXiv
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| Format: | Preprint |
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2025
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| author | Jia, Guang Bian, Zhongwei Li, Tianshu Bai, Shi Gou, Yongchen Li, Yiwen Zhao, Lixuan Luo, Jia Peng, Mingli Li, Weihua Gao, Peng Li, Tanping Hui, Hui Tian, Jie |
| author_facet | Jia, Guang Bian, Zhongwei Li, Tianshu Bai, Shi Gou, Yongchen Li, Yiwen Zhao, Lixuan Luo, Jia Peng, Mingli Li, Weihua Gao, Peng Li, Tanping Hui, Hui Tian, Jie |
| contents | Magnetic particle imaging (MPI) is an in vivo method to detect magnetic nanoparticles for cell tracking, vascular imaging, and molecular target imaging without ionizing radiation. Current magnetic particle imaging is accomplished by forming an field-free line (FFL) through a gradient selection field. By translating and rotating FFL under excitation and drive fields, the harmonic complex signal of a point source forms a Lorentzian-shape point spread function on the plane perpendicular to FFL. The Lorentzian PSF has a finite size and limited resolution due to the non-sharp Langevin function and weak selection field. This study proposes a donut-shaped focal spot by borrowing the stimulated emission depletion (STED) fluorescence microscopy principle. The influence of the gradient selection field on the relaxation time of magnetic particles determines the nonlinear phase shift of the harmonic complex signals, resulting in the formation of a donut-shaped focal spot. By subtracting the donut-shaped focal spot from the Lorentzian focal spot, the STED focal spot size was reduced by up to 4 times beyond the Langevin magnetization resolution barrier. In human brain FFL-based MPI scanner, the donut-shaped focal spot can be used to reconstruct images with super-resolution and super-sensitivity through the deconvoution of the STED focal spot and filtered backprojection algorithm. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_06490 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phase-based stimulated emission depletion (pSTED) magnetic particle imaging Jia, Guang Bian, Zhongwei Li, Tianshu Bai, Shi Gou, Yongchen Li, Yiwen Zhao, Lixuan Luo, Jia Peng, Mingli Li, Weihua Gao, Peng Li, Tanping Hui, Hui Tian, Jie Medical Physics Optics Magnetic particle imaging (MPI) is an in vivo method to detect magnetic nanoparticles for cell tracking, vascular imaging, and molecular target imaging without ionizing radiation. Current magnetic particle imaging is accomplished by forming an field-free line (FFL) through a gradient selection field. By translating and rotating FFL under excitation and drive fields, the harmonic complex signal of a point source forms a Lorentzian-shape point spread function on the plane perpendicular to FFL. The Lorentzian PSF has a finite size and limited resolution due to the non-sharp Langevin function and weak selection field. This study proposes a donut-shaped focal spot by borrowing the stimulated emission depletion (STED) fluorescence microscopy principle. The influence of the gradient selection field on the relaxation time of magnetic particles determines the nonlinear phase shift of the harmonic complex signals, resulting in the formation of a donut-shaped focal spot. By subtracting the donut-shaped focal spot from the Lorentzian focal spot, the STED focal spot size was reduced by up to 4 times beyond the Langevin magnetization resolution barrier. In human brain FFL-based MPI scanner, the donut-shaped focal spot can be used to reconstruct images with super-resolution and super-sensitivity through the deconvoution of the STED focal spot and filtered backprojection algorithm. |
| title | Phase-based stimulated emission depletion (pSTED) magnetic particle imaging |
| topic | Medical Physics Optics |
| url | https://arxiv.org/abs/2505.06490 |