A 38-year-old woman presents with hypertension (BP 158/98 mmHg) detected 6 months ago. She is on amlodipine 5 mg daily with suboptimal control. Clinical examination reveals an abdominal bruit. Serum creatinine is 1.4 mg/dL (baseline unknown). Which investigation is most appropriate to confirm the suspected diagnosis of renovascular hypertension?

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