Diagnostic Imaging

Diagnostic imaging uses various technologies to see inside the body — X-rays, ultrasound, CT scans, MRI, and nuclear medicine. Each has specific strengths. The right test depends on what a Health Expert suspects.

Main types

• X-ray — fast, low-dose; good for bones, lungs and some abdominal problems.
• Ultrasound — no radiation; good for pregnancy, abdominal organs (liver, gallbladder, kidneys), thyroid, breast, blood vessels, heart (ECHO).
• CT (Computed Tomography) — detailed cross-sections using X-rays; fast; used for trauma, stroke, lung disease, abdomen; higher radiation dose than a plain X-ray.
• MRI (Magnetic Resonance Imaging) — no radiation; best for brain, spine, joints, soft tissues; takes longer and is noisier; claustrophobia can be an issue.
• Nuclear medicine (PET, bone scan, thyroid scan) — uses small amounts of radioactive tracer; specific uses in cancer, heart function, bones, thyroid.

Radiation — sensible caution

• Medical radiation is usually low dose and worth it when a test is clearly needed.
• Do a test only when it will change what the Health Expert does. Repeated, unnecessary CT scans are a real issue in India — CT scans carry more radiation than plain X-rays.
• Keep a record of major scans — especially CTs — so doses add up only when needed.
• Pregnant women should avoid CTs and X-rays where possible; ultrasound and MRI are safer alternatives.

Contrast agents

• Some CTs and MRIs use contrast dye injected into a vein for better images.
• Tell the Health Expert about any kidney disease, diabetes, asthma, or previous contrast reaction before the scan.
• Serious reactions are uncommon but possible; modern imaging centres are prepared.

India practical notes

• Imaging is widely available in Indian cities and most towns.
• Costs vary hugely between government, private and charitable centres — ask.
• A report alone is not diagnosis — imaging findings should be interpreted by a Health Expert in context of your symptoms.
• Carry previous films/reports to follow-up visits — comparing old and new is often the most useful thing an imaging report can do.