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Ishikawa T, Isobe K, Inazawa K, Namiki K, Miyawaki A, Kannari F, Midorikawa K. Adaptive optics with spatio-temporal lock-in detection for temporal focusing microscopy. OPTICS EXPRESS 2021; 29:29021-29033. [PMID: 34615020 DOI: 10.1364/oe.432414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 07/23/2021] [Indexed: 06/13/2023]
Abstract
Wavefront distortion in temporal focusing microscopy (TFM) results in a distorted temporal profile of the excitation pulses owing to spatio-temporal coupling. Since the pulse duration is dramatically changed in the excitation volume, it is difficult to correct the temporal profile for a thick sample. Here, we demonstrate adaptive optics (AO) correction in a thick sample. We apply structured illumination microscopy (SIM) to an AO correction in wide-field TFM to decrease the change in the pulse duration in the signal detection volume. The AO correction with SIM was very successful in a thick sample for which AO correction with TFM failed.
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Shi R, Zhang Y, Zhou T, Kong L. HiLo Based Line Scanning Temporal Focusing Microscopy for High-Speed, Deep Tissue Imaging. MEMBRANES 2021; 11:membranes11080634. [PMID: 34436397 PMCID: PMC8400873 DOI: 10.3390/membranes11080634] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 08/10/2021] [Accepted: 08/11/2021] [Indexed: 01/12/2023]
Abstract
High-speed, optical-sectioning imaging is highly desired in biomedical studies, as most bio-structures and bio-dynamics are in three-dimensions. Compared to point-scanning techniques, line scanning temporal focusing microscopy (LSTFM) is a promising method that can achieve high temporal resolution while maintaining a deep penetration depth. However, the contrast and axial confinement would still be deteriorated in scattering tissue imaging. Here, we propose a HiLo-based LSTFM, utilizing structured illumination to inhibit the fluorescence background and, thus, enhance the image contrast and axial confinement in deep imaging. We demonstrate the superiority of our method by performing volumetric imaging of neurons and dynamical imaging of microglia in mouse brains in vivo.
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Affiliation(s)
- Ruheng Shi
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China;
| | - Yuanlong Zhang
- Department of Automation, Tsinghua University, Beijing 100084, China; (Y.Z.); (T.Z.)
| | - Tiankuang Zhou
- Department of Automation, Tsinghua University, Beijing 100084, China; (Y.Z.); (T.Z.)
- Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
| | - Lingjie Kong
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China;
- IDG/McGovern Institute for Brain Research, Tsinghua University, Beijing 100084, China
- Correspondence:
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Zhuang C, Li X, Zhang Y, Kong L, Xie H, Dai Q. Photobleaching Imprinting Enhanced Background Rejection in Line-Scanning Temporal Focusing Microscopy. Front Chem 2021; 8:618131. [PMID: 33392156 PMCID: PMC7773834 DOI: 10.3389/fchem.2020.618131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 11/20/2020] [Indexed: 11/13/2022] Open
Abstract
Compared with two-photon point-scanning microscopy, two-photon temporal focusing microscopy (2pTFM) provides a parallel high-speed imaging strategy with optical sectioning capability. Owing to out-of-focus fluorescence induced by scattering, 2pTFM suffers deteriorated signal-to-background ratio (SBR) for deep imaging in turbid tissue, Here, we utilized the photobleaching property of fluorophore to eliminate out-of-focus fluorescence. According to different decay rates in different focal depth, we extract the in-focus signals out of backgrounds through time-lapse images. We analyzed the theoretical foundations of photobleaching imprinting of the line-scanning temporal focusing microscopy, simulated implementation for background rejection, and demonstrated the contrast enhancement in MCF-10A human mammary epithelial cells and cleared Thy1-YFP mouse brains. More than 50% of total background light rejection was achieved, providing higher SBR images of the MCF-10A samples and mouse brains. The photobleaching imprinting method can be easily adapted to other fluorescence dyes or proteins, which may have application in studies involving relatively large and nontransparent organisms.
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Affiliation(s)
- Chaowei Zhuang
- Department of Automation, Tsinghua University, Beijing, China
| | - Xinyang Li
- Department of Automation, Tsinghua University, Beijing, China
| | - Yuanlong Zhang
- Department of Automation, Tsinghua University, Beijing, China
| | - Lingjie Kong
- Department of Precision Instrument, Tsinghua University, Beijing, China
| | - Hao Xie
- Department of Automation, Tsinghua University, Beijing, China
| | - Qionghai Dai
- Department of Automation, Tsinghua University, Beijing, China.,Beijing National Research Center for Information Science and Technology, Beijing, China.,Institute for Brain and Cognitive Science, Tsinghua University, Beijing, China.,Beijing Laboratory of Brain and Cognitive Intelligence, Beijing Municipal Education Commission, Beijing, China
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Zhang Y, Zhou T, Hu X, Li X, Xie H, Fang L, Kong L, Dai Q. Overcoming tissue scattering in wide-field two-photon imaging by extended detection and computational reconstruction. OPTICS EXPRESS 2019; 27:20117-20132. [PMID: 31510112 DOI: 10.1364/oe.27.020117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 06/21/2019] [Indexed: 06/10/2023]
Abstract
Compared to point-scanning multiphoton microscopy, line-scanning temporal focusing microscopy (LTFM) is competitive in high imaging speed while maintaining tight axial confinement. However, considering its wide-field detection mode, LTFM suffers from shallow penetration depth as a result of the crosstalk induced by tissue scattering. In contrast to the spatial filtering based on confocal slit detection, here we propose the extended detection LTFM (ED-LTFM), the first wide-field two-photon imaging technique to extract signals from scattered photons and thus effectively extend the imaging depth. By recording a succession of line-shape excited signals in 2D and reconstructing signals under Hessian regularization, we can push the depth limitation of wide-field imaging in scattering tissues. We validate the concept with numerical simulations, and demonstrate the performance of enhanced imaging depth in in vivo imaging of mouse brains.
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Xue Y, Berry KP, Boivin JR, Wadduwage D, Nedivi E, So PTC. Scattering reduction by structured light illumination in line-scanning temporal focusing microscopy. BIOMEDICAL OPTICS EXPRESS 2018; 9:5654-5666. [PMID: 30460153 PMCID: PMC6238912 DOI: 10.1364/boe.9.005654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 09/26/2018] [Accepted: 10/01/2018] [Indexed: 05/02/2023]
Abstract
Line-scanning temporal focusing microscopy (LineTFM) is capable of imaging biological samples more than 10 times faster than two-photon laser point-scanning microscopy (TPLSM), while achieving nearly the same lateral and axial spatial resolution. However, the image contrast taken by LineTFM is lower than that by TPLSM because LineTFM is severely influenced by biological tissue scattering. To reject the scattered photons, we implemented LineTFM using both structured illumination and uniform illumination combined with the HiLo post-processing algorithm, called HiLL microscopy (HiLo-Line-scanning temporal focusing microscopy). HiLL microscopy significantly reduces tissue scattering and improves image contrast. We demonstrate HiLL microscopy with in vivo brain imaging. This approach could potentially find applications in monitoring fast dynamic events and in mapping high resolution structures over a large volume.
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Affiliation(s)
- Yi Xue
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139,
USA
- Laser Biomedical Research Center, 77 Massachusetts Ave., Cambridge, MA 02139,
USA
| | - Kalen P. Berry
- Department of Biology, 77 Massachusetts Ave., Cambridge MA 02139,
USA
| | - Josiah R. Boivin
- Picower Institute for Learning and Memory,77 Massachusetts Ave., Cambridge, MA 02139,
USA
| | - Dushan Wadduwage
- Laser Biomedical Research Center, 77 Massachusetts Ave., Cambridge, MA 02139,
USA
- Department of Biological Engineering, 77 Massachusetts Ave., Cambridge, MA 02139,
USA
| | - Elly Nedivi
- Department of Biology, 77 Massachusetts Ave., Cambridge MA 02139,
USA
- Picower Institute for Learning and Memory,77 Massachusetts Ave., Cambridge, MA 02139,
USA
- Department of Brain and Cognitive Sciences, 77 Massachusetts Ave., Cambridge, MA 02139,
USA
| | - Peter T. C. So
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139,
USA
- Laser Biomedical Research Center, 77 Massachusetts Ave., Cambridge, MA 02139,
USA
- Department of Biological Engineering, 77 Massachusetts Ave., Cambridge, MA 02139,
USA
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