system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
I/V contrast is not used in –
assistant
The correct answer is  IV contrast agent is given in :-


X-ray based investigation (Radiocontrast agent) :- Radiography (simple x-ray), CT-Scan.
MRI (MR contrast agents).
Ultrasound (USG contrast agents).


IVP (intravenous pyelography) as the name suggests, the contrast agent is given intravenously.
In myelography, the contrast agent is injected into subarachnoid space.