Disclosed is a process of producing a microCT image of a stained specimen, wherein said specimen is a non-human organ, said process comprising: incubating a specimen in a first staining composition, said first staining composition comprising a first staining agent, to produce a stained specimen; submerging said stained specimen in a liquid with an electron density lower than that of said stained specimen; and placing said stained specimen in a specimen holder and scanning said stained specimen in an X-ray computed tomography scanner to produce said microCT image of said stained specimen.