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- W2372133040 abstract "Objective The purpose of the study was to evaluate an automatic exposure control (CARE Dose 4D) by phantoms.Materials Four phantoms were made of Plexiglas,one ellipse 35×12cm used for shoulder examination,one oval 26×17cm used for abdomen ex- amination,one oval 36×16cm used for hip examination and a cone shaped phantom for head and abdomen examination and diameters of the cone gradually increase form 13cm to 18cm.Whole four phantoms was 10cm long.64-slice spiral CT (SIEMENS,SOMATOM Sensation Cardiac 64) with an automatic exposure control that was based on both angular and z-axis tube current modulation.Methods The cone phantom was spirally scanning with and without the Automatic Exposure control by head and abdomen protocols.We measured and compared noise and effective mAs between automatic exposure and manual constant exposure controls with changes of the phantom diameter.The abdomen,shoulder and hip phantoms were respectively scanning with and without the automatic exposure control by their respective protocols.To compare effective mAs values between both exposure controls at the same noise level.Results The radiation dose reduction depended on the diameter of the cone phantom with the automatic exposure.At the same noise level,the automatic expo- sure could reduce dote between 8.9%-5.9% for the abdomen phantom,38.1%-33.5% for the shoulder phantom,38.1%-33.5% for the hip phantom.Discussion Patient centering was a critical factor in maintaining the image quality of scans with the automatic exposure and the radiation dose reduction depended on phantom geometry.The methods for evaluation of multi-slice CT could be a means for choice." @default.
- W2372133040 created "2016-06-24" @default.
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- W2372133040 date "2008-01-01" @default.
- W2372133040 modified "2023-09-23" @default.
- W2372133040 title "Methods for Evaluation of Spatial Resolution and an Automatic Exposure Control of MSCT" @default.
- W2372133040 hasPublicationYear "2008" @default.
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