Abstract
For the image quality of two-dimensional ultrasound systems, spatial resolution is one of the most important parameters. This resolution is determined by the directivity pattern. In practice, the directivity pattern of phased arrays will be distorted due to errors in critical components. In a previous study the influence of amplitude errors has been dealt with. In this second study, the parameters describing the range and the nature of phase errors are derived. With these parameters a qualitative prediction of the directivity pattern seems to be possible. Within the design limits of a given phased array, means are indicated to minimize the beam distortion due to occurring phase errors.
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