Introduction to Computational Fluorescence Microscopy!
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1 Introduction to Computational Fluorescence Microscopy! EE367/CS448I: Computational Imaging and Display! stanford.edu/class/ee367! Lecture 13! Gordon Wetzstein! Stanford University!
2 Midterm! Tuesday, Feb 27, 10:30-11:50am in Gates 03! In-class you need to be here! open book: use slides, internet, bring computer, whatever you like! can all be solved without programming, similar to theoretical questions of the assignments! only SCPD students can do remotely, we will be ing you!
3 H. Rankin, transgenic xenopus laevis (african clawed toad) tadpole neurons (green); technique: confocal 10x!
4 M. Kandasamy, stained cells: actin (pink), DNA (yellow), mitochondria (green); technique: super resolution microscopy!
5 M. Boyle, larva of nephasoma pellucidum (peanut worm); technique: confocal 40X!
6 D. Burnette, osteosarcoma cell (bone cancer) showing actin (purple), mitochondria (yellow), DNA (blue); technique: structured illumination microscopy (SIM)!
7 T. Deerinck, HeLa cells with microtubules; technique: 2-photon microscopy 300X!
8 Nikon Small World Competition! annual photography competition, see showed only fluorescent samples (many others in the gallery)! this lecture: overview of fluorescence microscopy techniques!
9
10 source: white house & nature!
11 Brain Initiative! frontier of science (past frontiers: fly to moon, decode human genome)! two key factors: fluorescence microscopy & computational illumination!
12 Deisseroth Lab, Stanford; CLARITY; Nature 2013!
13 Widefield Microscopy! source: microscopyu!
14 Microscope Objective! source: Zeiss!
15 The Diffraction Limit! Ernst Abbe, 1905! source: wikipedia!
16 The Diffraction Limit! d =! 2nsin" =! 2NA!
17 The Diffraction Limit! d =! 2nsin" =! 2NA!!
18 The Diffraction Limit! d =! 2nsin" =! 2NA!! Airy disk!
19 The Diffraction Limit! d =! 2nsin" =! 2NA Rayleigh Criterion! Airy disk! source: wikipedia!
20 Lateral and Axial Resolution & Missing Cone!
21 Fluorescence Microscopy!!!!! excitation and emission! coherence / incoherence! fluorescent labels! calcium imaging!
22 Fluorescence Microscopy (epi setup)! source: wikipedia!
23 Fluorescence Microscopy (epi setup)! source: Nikon MicroscopyU! source: wikipedia!
24 Sensors used in Microscopy!! e.g., Andor ixon Ultra 897: cooled to -100 C or Hamamatsu Ocra Flash4.0 V2!! scientific CMOS & CCD (~20-50K)!! reduce pretty much all noise, except for photon or shot noise!
25 Fluorescence Microscopy - Challenges! inherently 2D need 3D for active brain imaging! higher-resolution in 2D and 3D! scattering! larger fields of view, bleaching! solution: engineer detection and illumination optics, algorithms, chemistry!!
26 ! Fluorescence Microscopy - Challenges!! inherently 2D need 3D for active brain imaging!! higher-resolution in 2D and 3D!!! scattering! larger fields of view, bleaching!! solution: engineer detection and illumination optics, algorithms, chemistry!
27 Superresolution Fluorescence Microscopy! stimulated emission-depletion (STED) microscopy! localization microscopy! 2D: STORM/PALM etc.! 3D: double helix PSF! localization algorithms! structured illumination microscopy (SIM)!
28 2014 Nobel Price in Chemistry: super-resolved fluorescence microscopy! Eric Betzig! (Howard Hughes Institute)! Stefan Hell! (Max Planck Institute)! W. E. Moerner! (Stanford)!
29 Stimulated Emission-Depletion (STED) Microscopy! excitation spot! de-excitation spot! emitted spot! source: wikipedia!
30 Stimulated Emission-Depletion (STED) Microscopy!
31 Localization Microscopy: PALM / STORM!
32 Structured Illumination Microscopy (SIM)!
33 3D Fluorescence Microscopy! confocal microscopy! 2 photon microscopy! light sheet microscopy! 3D deconvolution microscopy / focal stacks! others: spinning disk confocal, aperture correlation,!
34 1957! Confocal Microscopy!
35 Confocal Microscopy!
36 Widefield vs Confocal Thin Sample! source:
37 Widefield vs Confocal Thick Sample! source:
38 2-Photon Microscopy! Denk et al. Two-photon laser scanning fluorescence microscopy, Science 1990; photo: microscopy.berkeley.edu!
39 2-Photon Microscopy! deep imaging! good scattering properties! Denk et al. Two-photon laser scanning fluorescence microscopy, Science 1990; photo: microscopy.berkeley.edu!
40 3D Deconvolution Microscopy!
41 3D Deconvolution Microscopy! whiteboard!
42 Light Sheet Microscopy!! invented by R. Zsigmondy, Nobel price in 1925!! Nature Method of the Year 2014! Huisken et al. Selective Plane Illumination Techniques in developmental biology, Development 2009!
43 Ahrens et al. Whole-brain functional imaging at cellular resolution! using light-sheet microscopy, Nature Methods 2013!
44 Light Field Microscopy!!!! can do refocus, but more interesting: instantaneous 3D volume (for fluorescence)! diffraction becomes an issue! [Levoy et al. 2006]!
45 Levoy Group, Stanford! Light Field Microscopy!
46 Levoy Group, Stanford!
47 Levoy Group, Stanford! Light Field Microscopy!
48 3D Light Field Deconvolution!!! light field contains aliasing! use 3D deconvolution to get higher resolution! [Broxton et al. 2013]!
49 3D Light Field Deconvolution! lateral resolution is depth dependent! [Broxton et al. 2013]!
50 Functional 3D Brain Imaging! C. elegans! [Prevedel et al. 2014]!
51 Functional 3D Brain Imaging! optics design by Marc Levoy! Captured Light Field! [Prevedel et al. 2014]!
52 maximum intensity projection of volume! 350um x 350 um x 24 um at 50Hz! ~70 neurons in head region! [Prevedel et al. 2014]!
53 [Prevedel et al. 2014]!
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