Effectiveness of Ultrasound-Aided Articulation Therapy for Children with Speech Sound Disorders

Inclusion Criteria: * No syndromes or obvious dysmorphic features; No language disorders associated with biomedical conditions (e.g., cerebral palsy, autism spectrum disorder); No oronasal fistula identified in oral examination or diagnosed velopharyngeal insufficiency; Hearing thresholds between 0 to 25 dB in at least one ear, with no hearing loss exceeding 50 dB in the other; Cantonese as the first language Exclusion Criteria: * Subjects with syndrome, speech or language disorder associated with biomedical conditions (e.g. cerebral palsy, autism spectrum disorder), hearing threshold higher than 25dB in one ear and hearing loss with more than 50dB in another ear would be excluded from the study. Participants would be excluded fromthe study if they have other planned surgical intervention during the study period.