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Multicontrast x-ray computed tomography imaging using Talbot-Lau
interferometry without phase stepping
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The purpose of this work is to demonstrate that multicontrast computed tomography(CT)imaging can be
performed using a Talbot-Lau interferometer without phase stepping, thus allowing for an
acquisition scheme like that used for standard absorption CT.
Rather than using phase stepping to extract refraction, small-angle scattering (SAS),
and absorption signals, the two gratings of a Talbot-Lau interferometer were rotated slightly to
generate a moiré
pattern on the detector. A Fourier analysis of the moiré pattern was performed
to obtain separate projection images of each of the
three contrast signals, all from the same single-shot of x-ray exposure. After the
signals were extracted from the detector data for all view angles, image reconstruction
was performed to obtain absorption, refraction, and SAS CTimages. A physical
phantom was scanned to validate the proposed data acquisition method. The results were
compared with a phantom scan using the standard phase stepping approach.
The reconstruction of each contrast mechanism produced the expected
results. Signal levels and contrasts match those obtained using the phase stepping
Absorption, refraction, and SAS CTimaging can be
achieved using the Talbot-Lau interferometer without the additional overhead of long
scan time and phase stepping.
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