What are the names of these three medical devices, please?

The third should be a small CT, that is, electronic computed tomography. It is the use of precise collimation of X-ray beams, γ-rays, ultrasound, etc., with a very high sensitivity detector around a part of the human body for a cross-section scanning, with a fast scanning time, the image is clear and so on, can be used for a wide range of diseases; according to the use of different rays can be divided into: X-ray CT (X-CT), ultrasound CT (UCT), as well as gamma ray CT (γ-CT) The X-ray CT (X-CT), ultrasound CT (UCT) and gamma-ray CT (γ-CT) can be categorized according to the rays used.