Abstract: Introduction: all over the world, the number of patients with peripheral arterial lesions is growing, the progression of the disease leads to the chronic limb-threatening ischemia (CLTI) with an increasement in mortality. To carry out revascularization, it is required to accurately determine the degree and length of lesions of arteries of limbs, with the creation of a «road map» of lesions and the choice of the least affected artery ? the target arterial pathway. Aim: was to determine the effectiveness of CT angiography in diagnosing lesions of shin arteries in patients with critical lower limb ischemia (CLI) by calculating its sensitivity and specificity in comparison with digital subtraction angiography. Materials and methods: the study included 26 patients (15 men and 11 women, average age of patients 69,3 ± 10,8 years) with critical lower limb ischemia, against the background of lesions of the femoro-popliteal segment of arteries, class D TASC II. All patients underwent CT angiography on a 64-spiral computed tomography scanner. Obtained data was compared with results of catheter angiography (digital subtraction angiography), used as a reference method. Results: the sensitivity of CT angiography in determining the degree of lesion (stenosis or occlusion) of leg arteries was 100% and 94%, the specificity was 83% and 96%, respectively. The overall accuracy of CT angiography in the tibial segment was 87% for stenoses and 94% for occlusions. According to results of CTA, massive calcification was detected in 13% of cases from the total number of analyzed arteries. When evaluating these arteries according to DSA data, most of arteries (11 of 12) were occluded, and the length of occlusions in 8 cases was maximum according to the GLASS classification (the length was more than 1/3 of the artery length). 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