Effect of CDMA techniques with Kasami codes on ultrasound-image quality parameters

This works presents an analysis of the benefits of CDMA (Code Division for Multiple Access) excitation techniques on the quality parameters of ultrasonic phased array images such as gratinglobes, sidelobes, dynamic range, lateral resolution and range resolution. In order to consolidate these benefits, a comparison between phased array excitation and CDMA techniques in airborne transmission is performed. Furthermore it is shown how not only image rate, but also range resolution and SNR (Signal to Noise Ratio) are improved with CDMA excitation techniques. A disadvantage of the proposal is a decreased dynamic range in the B-Scan image, therefore a different emission schema is proposed.

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