What is computed tomography?

• A. X-ray imaging
• B. Ultrasound
• C. MRI
• D. CT scan

Answer: (D)

Computed tomography is an imaging method that uses X-ray beams arranged around the body as the machine rotates, collecting many projections. A computer then reconstructs these projections into cross‑sectional images (slices) that reveal internal structures in detail. Because multiple angles are used, CT can produce high-resolution pictures in different planes and even 3D views, showing bon e and soft tissues clearly. It’s a specialized form of X-ray imaging that relies on ionizing radiation and advanced reconstruction techniques. This differs from ultrasound, which uses sound waves, and from MRI, which uses magnetic fields and radiofrequency energy to image tissues without ionizing radiation and with different tissue contrast.