Patent ID: 9201028
Filing Date: 2015-12-01
Classification: A61B,G01N,G01V

Abstract:
1. An X-ray backscatter imaging system comprising: a modulation signal source for generating a frequency modulation signal; a first bias signal source for generating a first bias signal; means for modulating the first bias signal with the frequency modulation signal to provide a first frequency-modulated bias signal; an X-ray radiation source for receiving the first frequency-modulated bias signal and generating X-ray radiation modulated by the first frequency-modulated bias signal, wherein the X-ray radiation impinges upon and penetrates a target, and is backscattered from multiple depths within the target; scintillating material for receiving X-ray radiation backscattered from the multiple depths within the target and for generating photons corresponding to the backscattered X-ray radiation; a second bias signal source for generating a second bias signal; means for modulating the second bias signal with the frequency modulation signal to provide a second frequency-modulated bias signal; photon detection means for receiving the photons generated by the scintillating material, receiving the second frequency-modulated bias signal, and generating an analog output signal based thereon, wherein the analog output signal contains phase delay information indicative of distance travelled by the X-ray radiation backscattered from the multiple depths within the target; an analog-to-digital converter for sampling the analog output signal at a sampling frequency and converting the analog output signal to a digital output signal; and a computer processor for receiving the digital output signal and performing a discrete Fourier transform on the digital output signal to provide target feature depth information based on the phase delay information.