{'fraction_non_alphanumeric': 0.01969057665260197, 'fraction_numerical': 0.002109704641350211, 'mean_word_length': 4.953974895397489, '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}}
The Use of Ultrasound Imaging in Dermatology Incorporación de la ecografía en Dermatología

Cutaneous ultrasound imaging has recently gained ground in dermatology as it has in other specialties (urology, rheumatology, and anesthesiology, for example). Already available to dermatologists in some centers, this tool provides images that can complement the clinical visit, whether for diagnosis or following a patient’s response to a course of treatment. When ultrasound waves emitted by a transducer, or probe, meet a tissue inside the body, an echo is reflected back from the surface of the tissue to the source. At the probe the signal is converted to electrical pulses that are processed to produce an image on a computer screen. The main variables affecting ultrasound images are the frequencies of waves emitted and the depth from which they are reflected back to the probe. In specialties like gynecology or general surgery, low frequencies are used to penetrate deep into the body in order to visualize internal organs. In dermatology, high frequencies (around 15 MHz) are used to reach a depth of about 3 cm so that superficial structures can be viewed with good resolution. B-mode sonography uses a white-balance method to display images in a range of gray tones between white and black. Various types of Doppler ultrasonography can also be used to complement these B-mode images. In color Doppler mode, ultrasound