Do all imaging procedures use radiation (x-ray)?

No, not all do. In the X-ray (Radiology) department, there are different imaging modalities, some of which use radiation, e.g. routine x-rays, fluoroscopy procedures, and IVP. There are others that use ultrasound waves, e.g. ultrasound procedures, and magnetism, e.g. M.R.I., to produce different images of the body.