ABSTRACT
Before applying any image processing technique described in the previous chapters to analyze a biomedical image, one needs to create an image. This is often done using computational techniques specialized to exploit the physical laws governing the imaging system as well as the tissue to be imaged. Despite the differences in the physical laws and principles of imaging modalities such as magnetic resonance imaging (MRI), x-ray CT, ultrasound, and positive emission tomography (PET), surprisingly the core computational techniques used to create an image in all these modalities are more or less the same. These computational techniques are often referred to as
computed tomography
(CT). We start this section by describing the main concepts of CT and its importance in biomedical image processing.
