MRI stands for Magnetic Resonance Imaging, a type of medical imaging. An MRI scan uses magnetic fields instead of X Rays to create a picture of your body, and uses a computer to create cross sections of the body and organs.
CT stands for Computed Tomography, a type of medical imaging. A CT scan (computed tomography) or CAT scan uses x-rays to obtain images of your body and uses a computer to create cross sections of the body and organs.
PET stands for Positron Emission Tomography. A PET scan is a medical imaging technique which produces a three dimensional image or map of functional processes in the body. A PET scan is used to detect cancers, and in the diagnosis of conditions such as heart disease and Alzheimer's disease.
Most pregnant women have at least one ultrasound scan to capture pictures of their unborn baby and check for abnormalities such as Down’s Syndrome, spina bifida and heart defects.
If you would like to know about ultrasound - including the availability and cost of ultrasound - the following information will interest you