HW6 Suggestion - René Nerio #33
Description
[1] Usefulness:
I found the introduction of PSF engineering in Section 11.5 (especially 11.5.2 Microscopy and depth) extremely eye-opening. The idea that we can deliberately shape the point spread function so that its orientation encodes depth information was completely new to me when I read about it. A modern imaging system that critically relies on this exact concept is commercial 3D single-molecule localization microscopy, such as the instruments sold by Double Helix Optics. These systems are used daily in biology labs to map the precise 3D positions of fluorescently labeled proteins inside living cells. Understanding engineered PSFs is essential for engineering these microscopes because the depth information comes entirely from the shape and rotation of the PSF rather than from mechanical scanning or defocus blur, enabling much faster and gentler 3D imaging of live samples.
[2] Improvement:
Section 11.5.2 explains the double-helix PSF beautifully and includes Figure 11.8, but the figure is quite small and shows only simulated PSFs plus a graph. Most students (including me) have never seen real experimental data from such a system, so the impact feels a bit abstract. I suggest adding a small extra panel to Figure 11.8 (or a new Figure 11.9) that shows some real microscope images captured with the double-helix PSF. A short caption or tiny arrows showing how the rotation angle directly tells us the depth would make the idea much more concrete. If real experimental images are difficult to include, a few carefully rendered simulations that mimic the appearance of actual sensor data (with realistic photon noise and background) would possibly be a big help too.
Many thanks,
René Nerio.