Abstract
Computed Tomography (CT) is an efficient and non-invasive method to obtain data about internal structures of the human body. CT scans contribute with the highest absorbed doses in population due X-ray beam attenuation and it has raised concern in radiosensitive tissues. Techniques for the optimization of CT scanning protocols in diagnostic services have been developing with the objective of decreasing the absorbed dose in patient, aiming image quality within acceptable parameters for diagnosis by noise control.
Highlights
Demand for diagnose images by Computed Tomography (CT) has grown considerably, with the consequence that increases the radiation dose rates in the population
Routine head scans were performed using GE CT scan of 64 channels programmed with automatic exposure control and voltages of 80, 100 and 120 kV attaching the noise index in approximately 0.5%, using the tool of smart mA
Automatic exposure control was introduced in CT in the decade of 1990 for procedures in nuclear medicine and radiation therapy [4], which consists in change levels of current that feeds the X-ray tube as soon as scanning takes place in proportion to the density of tissues which attenuate the X-ray beam
Summary
Demand for diagnose images by CT has grown considerably, with the consequence that increases the radiation dose rates in the population. Automatic exposure control was introduced in CT in the decade of 1990 for procedures in nuclear medicine and radiation therapy [4], which consists in change levels of current that feeds the X-ray tube as soon as scanning takes place in proportion to the density of tissues which attenuate the X-ray beam. This type of control is used most frequently in chest routines because in this area has a higher variation in lateral and frontal diameters. In sensitive organs to radiation scans are research topics by risks and high chances of developing serious illnesses such as for example the lens that may develop cataracts to have exposure greater than 2 Gy according to ICRP [5,6].
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