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Figure 2a. Noise and dose versus tube current–time product and effective mAs for noncardiac (a, b) and cardiac (c, d) spiral CT modes at four different pitch (p) values and two different gantry rotation times (0.33 seconds and 0.37 seconds). The left y axis corresponds to noise curves; the right y axis corresponds to dose curves. Note that in cardiac mode, noise is dependent on tube current–time product and not on pitch (c). CTDIvol =Volume CT Dose Index.
