[en] A computerized tomographic (CT) scanner has been assembled with a geometric resolution of ∼25 to 50 μm. This CT scanner, designed and built at the University of Rome open-quotes La Sapienzaclose quotes has the following components: (1) X-ray tube working between 20 and 55 key with a maximum current of 30 mA; this tube used bremsstrahlung radiation and filtered the primary radiation with absorbers composed of an element or elements to quasi monochromatize the primary radiation; (2) single X-ray Nal(TI), high-purity germanium detector, or an array of detectors; (3) electronic chain with an amplifier, a single-channel analyzer, and a programmable timer-scaler; (4) translation-rotation system allowing for ∼1-m error for linear positioning and the equivalent for rotation; (5) IBM-compatible 286 personal computer, which drives both the translation-rotation system and the timer-scaler; and (6) reconstruction program, written in turbo-Pascal, which is able not only to give the reconstructed matrix of linear attenuation coefficients but also to simulate the matrix and the related tomography