caption: a diagram showing the filtering mechanism in a filter
exif: {"Image DocumentName": "Filtered Back Projection Method", "Image ImageDescription": "This always works! Object. Digital Filter. take 1D FFT of projection. multiply by ramp filter. take 1D inverse FFT. make a back projection.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}