<p dir="ltr">This dataset comprises <b>153 subfolders</b> within a primary directory named <i>data</i>, derived from <b>85 participants</b>. Each participant typically contributes <b>2–3 subfolders</b>, contingent on the completeness and quality of their M-mode echocardiography (UCG) recordings. Subfolder names follow the format: <b>hdata + SubjectID + EJ/XJ/ZJ</b><b> to denote the specific cardiac region captured in the ultrasound data:</b></p>
