The sensitivity of X-ray phase tomography based on Talbot(-Lau) interferometry is discussed. A criterion is described to evaluate the superiority of the technique in comparison to the conventional absorption-contrast method. An experimental result of X-ray phase tomography with a Talbot interferometer is compared with the criterion. The advantage of X-ray phase tomography based on Talbot(-Lau) interferometry is more prominent when smaller structures are observed with smaller pixels.
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