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MRI (Magnetic Resonance Imaging) is the preferred imaging technique for diagnosing sciatica or radicular pain because it provides detailed images of the soft tissues, including the spinal discs and nerve roots. This allows healthcare professionals to identify conditions such as herniated discs, spinal stenosis, or any other abnormalities that may be pressing on the sciatic nerve and causing pain.

While other imaging techniques like ultrasounds, X-rays, and CT scans can provide certain information, they are not as effective as MRI in visualizing the soft tissue structures related to sciatica. X-rays primarily show bone conditions and might miss soft tissue injuries or compressions. Ultrasound is more limited in depth and detail for spine problems. CT scans can offer some insights into spine structure but do not provide the same level of soft tissue detail as MRI. Consequently, for a comprehensive assessment of the causes of sciatica, MRI is the most reliable imaging modality.