Diagnostic ultrasound uses high frequency sound waves and other diagnostic techniques for medical purposes. The practitioner must be competent in the production, use, recognition, and analysis of ultrasound images and patterns used for patient diagnosis and treatment. The sonographer is regarded as the expert source of all ultrasound imaging, and the interpreting radiologist relies heavily on the skills, knowledge, and abilities of the sonographers in providing a final interpretation. Basic Requirements: United States Citizenship: Non-citizens may only be appointed when it is not possible to recruit qualified citizens in accordance with VA Policy. Education. There are no specific educational requirements for this occupation. Education may be substituted for experience only at the GS-4 and