Fig. 1

Representative axial views of CT image using A mAs 7, B mAs 30, C mAs 30, and Tin filter along with the subtracted images with respect to the reference CT image; D the subtraction of CT mAs-30, CT mAs-7, and E the subtraction of CT mAs-30, CT mAs-30-Tin filter. The CNR and SNR values for each slice are available.