Radiation Dose in CT Studies

In general, all indications for CT examinations must be established with caution due to the use of ionized radiation. For calcium scoring the effective radiation dose of standard CT scan protocols is about 1 mSv in EBCT and between 1 and 6 mSv in MSCT [21-23]. For comparison the average dose of the natural annual background radiation is approximately 3 mSv. However, several attempts have been made to further reduce the CT radiation dose. As an example, the use of specific low-dose CT scanning protocols with reduced mAs und kV settings and the so-called tube current modulation technique may substantially reduce the patient's radiation dose in MSCT without losing the reliability of coronary artery calcium measurements [22-26].

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