Abstract
With multi-slice helical scanning, increasing helical pitch causes changes in the effective slice sensitivity profile and thus in a thickening of the effective slice thickness. However, the increase in helical pitch alters the time sensitivity profile, thereby decreasing the effective scan time. In this paper we report the results of our research concerning the setting of optimum conditions to resolve this issue. The experiment was conducted with a moving phantom. The movement showed a variety of changes. When the subject was not in motion, increases in helical pitch resulted in deterioration in the image quality of the CT image. However, when the subject was in motion increases in helical pitch improved image quality. The general belief until now has been that helical pitch should be decreased in order to improve CT image quality. However, in the case of a moving subject, reduced helical pitch leads to deterioration in the time resolution and thus to a deterioration in the image quality. Through this study we have acquired an understanding of which helical pitch value is optimal in terms of the subject's rate of movement.
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