Howtosignalprocessing
The point spread function (PSF) describes the response of a focused optical imaging system to a point source or point object. A more general term for the PSF is the system's impulse response; the PSF is the impulse response or impulse response function (IRF) of a focused optical imaging system.
- What does the point spread function tell you?
- How does PSF affect resolution?
- How do I get PSF from an image?
- What is PSF in pet?
What does the point spread function tell you?
In fluorescence microscopy, the acquired image is always a blurred representation of the actual object under the microscope. This blurring is described by the so-called Point Spread Function (PSF). The PSF describes what a single point in the object looks like in the image.
How does PSF affect resolution?
The PSF varies depending on the wavelength of the light you are viewing: shorter wavelengths of light (such as blue light, 450 nm) result in a smaller PSF, while longer wavelengths (such as red light, 650 nm) result in a larger PSF and, therefore, worse resolution.
How do I get PSF from an image?
To be sure, you can calculate it knowing the optical resolution d = lambda / 2*NA. (NA is the second number written on the objective lens, after the slash after the magnification number.) Then divide d by the pixel spacing in the image and that is the approximate PSF size.
What is PSF in pet?
Point spread function (PSF) reconstruction can improve spatial resolution and signal-to-noise ratio of PET imaging. The aim of this study was to evaluate the effectiveness of 18F-FDG PET/CT with PSF reconstruction for initial staging in rectal cancer compared with conventional PET/CT and pelvic MRI.
