1. A method of obtaining an image of the distribution of an internal property of an object by recording and processing the intensities of multiple rays that have passed through said object and have been attenuated by said property, said method comprising the steps of: irradiating the object with one or more rays of energy from one or more localized energy sources with the rays going through the object to one or more detectors and recording the detected intensity of each ray; acquiring said intensity or intensities multiple times with differing locations of the rays through the object; creating for each ray a first array of numbers said numbers having a periodic modulation across the array with the amplitude of the modulation being determined by the intensity of the ray and with the frequency and direction of the modulation being determined by the location of the ray in the object; adding each first array of numbers as a line or plane into a second array of numbers said second array having one more dimension than the first array with the location of the line or plane in the second array determined by the location of the ray in the object; adjusting the numbers in the second array to correct for the non-uniform density of data in the second array; and performing a Fourier transform on the numbers in the second array thereby generating an image of the distribution of the property of the object.