IMPROVEMENT OF CT SCAN QUALITY BY REDUCING EFFECTIVE DOSE

One of the main tasks of CT scanner design is to obtain enough quality of image and to reduce effective dose of X - ray radiation. These are inconsistent requirements because reducing of effective dose in the same time can degrade the image quality. The fact that can be used to reduce the dose while preserving the image quality is that different tissues absorb X-photons of different energy which allow us to make specific scanning procedures depending on the type of tissue being examined. This scenario includes use of different filter types, which change the X-ray spectra produced by the X –ray tube. In this paper two types of tissues are considered soft and cortical bone tissue. For X ray spectra simulation the SpekCalc software is used. This approach can be very helpful for medical doctor to reduce total effective dose during scanning procedure.