PRINCIPLES OF CT SCAN ABDOMEN
A CT scan makes use of computer-processed combinations of many X-ray images taken from different angles to produce cross-sectional (tomographic) images (virtual "slices") of specific areas of a scanned object, allowing the user to see inside the object without cutting. Other terms include computed axial tomography (CAT scan) and computer aided tomography.
BASIC PRINCIPLE of CT(COMPUTED TOMOGRAPHY) is that the internal structure of an object can be reconstructed from multiple projections of that object.
The ray projections are formed by scanning a thin cross section of the body with a narrow x-ray beam and measuring the transmitted radiation with a sensitive radiation detector.
The detector adds up the energy of all the transmitted photon. The numerical data from multiple ray sums are than computer processed to reconstruct an image.