{'fraction_non_alphanumeric': 0.019184652278177457, 'fraction_numerical': 0.0, 'mean_word_length': 5.2288557213930345, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
A comparison of Walsh and Maximum Length Sequence signal coding applied to time domain beamforming

Time domain beamforming is an ultrasonic method of imaging point-like scattering objects in low contrast media. This method has been widely applied in medical and industrial ultrasonic imaging modalities, but its resolution is known to be limited by pulse width and frequency. In general, high frequency components of ultrasonic signals are more heavily attenuated, and thus there is a tradeoff between resolution and the maximum distance between a transmitter and receiver of an array. This imposes an upper bound on the size of the region that can be effectively reconstructed using ultrasonic imaging. Another limitation of standard ultrasonic beamforming comes about due to the one-to-all type transmit-receive style signal acquisition. In this type of signal acquisition, one array element transmits and all elements act as receivers. This is repeated for all elements to acquire the maximum amount of information (i.e. full matrix capture) about the interrogated region. This work compares Walsh, and Maximum Length Sequence (MLS) coded ultrasound beamforming with standard beamforming to evaluate the effects on resolution, and signal strength.