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  • Title: Dose reduction and image quality assessment in 64-detector row computed tomography of the coronary arteries using an automatic exposure control system.
    Author: Francone M, Di Castro E, Napoli A, Bolzan C, Carbone I, Bertoletti L, Iuliano L, Catalano C, Passariello R.
    Journal: J Comput Assist Tomogr; 2008; 32(5):668-78. PubMed ID: 18830094.
    Abstract:
    OBJECTIVE: To evaluate dose reduction and image quality in coronary 64-slice multidetector computed tomography using an automatic exposure control system (AECs). METHODS: A total of 101 patients were divided into 4 groups. Tube current was 600 and 800 mAs in groups A and B and adapted at 600 and 800 quality-reference mAs using an AECs in groups C and D. Effective dose and organ-equivalent dose were evaluated. Image noise was quantified as standard deviation of air-space attenuation. Two observers assessed technical adequacy and image quality using a 4-point scale. RESULTS: Effective dose ranged from 8.6 mSv (group C) to 15 mSv (group B) with significant dose reduction for examinations performed at 600 mAs (21.7%) and 800 mAs (29.4%). Contribution of organ-equivalent doses showed higher exposure for lungs (42%) and breast (22%). Noise was significantly higher in groups studied with AECs. Larger coronary segments resulted in higher image quality scores without differences between groups. CONCLUSION: Automatic exposure control systems provides images of diagnostic quality with substantial dose reduction.
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