Employees at this grade level serve as an advanced staff DRT beyond the full performance level of DRT. Employees at this grade level are qualified to provide services in specialized areas of radiologic technology include general diagnostic radiologic technology and ultrasound (Diagnostic/Vascular sonography). 50% General Radiology 50% Ultrasound ([Diagnostic/Vascular] Sonography 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. Certification. All applicants must be certified in general radiologic technology by the American Registry of Radiologic Technology, Radiography (ARRT) (R). Advanced ARRT certification is required for assignments that include computed tomography (CT), m