Study of Image Quality, Radiation Dose and Low Contrast Resolution from MSCT Head by Using Low Tube Voltage

Abstract

Effect of low tube voltage (80 kV) on image quality, radiation dose, and low contrast (LCD) detection capability on CT Scan head was studied by using a solid phantom contains four modules with scanning CT at 80 and 120 kV tube voltages, with tube current timing at 200, 250 and 300 mAs. The difference between image noise, noise to ratio contrast and LCD values obtained with 80 and 120 kV at 200, 250 and 300 mAs were then compared. Substantially the image noise increases with the use of low tube voltage. However, with the same dose, the LCD values are between 120 kV at 300 mAs and 80 kV at 200, 250 and 300 mAs (P> 0.05). The relative dose given at 80 kV against 200, 250 and 300 mAs is equal to 68%. By reducing the tube voltage from 120 kV to 80 kV at head CT, the radiation dose can be reduced by 32% without CNR and LCD degradation.

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