CT scans produce detailed three-dimensional images of internal body structures using X-ray technology — invaluable for diagnosing trauma, cancer, stroke, and organ disease.
Computed tomography (CT) scanning uses a series of X-ray images taken from multiple angles, processed by a computer to generate detailed cross-sectional images ('slices') of the body. Modern multi-detector CT scanners acquire these images in seconds, producing high-resolution 3D reconstructions of any body region — head, chest, abdomen, pelvis, spine, or extremities. CT scanning is invaluable in emergency settings (trauma assessment, stroke diagnosis, aortic emergencies), oncology (staging and monitoring cancer), and routine diagnostic imaging.
In Korea, CT scanning is available at all major hospitals (including 24/7 emergency CT at large hospital emergency departments), children's hospitals, and numerous private radiology centres. Modern CT scanners in Korea are 64–320 slice systems. A typical CT scan takes only a few minutes, though the appointment including preparation takes 30–60 minutes. Contrast dye (iodinated contrast medium) is used for many CT studies — it enhances blood vessels and certain organs, improving diagnostic quality. Patients with contrast allergy or kidney disease require special precautions.
Radiation dose is an important consideration. A chest CT delivers approximately 7 mSv of radiation — equivalent to about 2–3 years of natural background radiation. While this is not trivial, CT is only requested when the clinical benefits clearly outweigh the small radiation risk. Korea's radiologists follow ALARA (as low as reasonably achievable) principles, optimising scanning protocols to minimise dose while maintaining diagnostic quality. MRI is preferred when equivalent information can be obtained without radiation, particularly in children and young adults.
Key Points
- CT delivers more radiation than X-ray — only used when clinically indicated
- Contrast dye enhances blood vessels and improves diagnosis — needs kidney function check
- Available 24/7 at hospital emergency departments for urgent cases
- Modern CT scanners in Korea are 64–320 slice multi-detector systems
- Results reviewed by specialist radiologists and communicated to your doctor
- Avoid CT in pregnancy unless benefit significantly outweighs risk
When to See a Doctor
- Your doctor will request a CT scan based on clinical findings — do not self-request
- Inform the CT team if you have kidney disease, diabetes, contrast allergy, or are pregnant
- Inform the team if you are taking metformin — may need temporary pause
For emergencies in Korea, call 119
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This content is published for educational purposes only. For accurate diagnosis and personalised treatment, consult a licensed KMA physician in Korea.
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This article is published by DoctorsInKorea.com for educational and informational purposes only. It does not replace a professional clinical evaluation by a licensed healthcare provider. For accurate medical diagnosis and personalised treatment paths, please book an appointment with a licensed KMA physician. For immediate life-threatening medical emergencies in Korea, please call 119.
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Last reviewed: March 1, 2025