OArm – mobile computer tomography scanner. Allows for an operating specialist to examine a region of interest at any moment of operation only within 15 seconds and within other 15 seconds - to get a full 3D-reconstruction for anatomical structures to perform a more precise interference. The received pictures are displayed on the 30'' high-definition screen. All operations on the pictures control – enlarge/decrease, switch mode from 2D to 3D, perform reconstruction, print etc. – can be performed by a surgeon by means of sterile wireless mouse pointing device without falling back upon personnel’s help and without leaving a sterile zone.