Imaging Anatomy: X-ray, CT, and MRI

Medical imaging allows visualization of internal anatomy without surgery. Understanding normal imaging anatomy is essential for identifying pathology.

X-rays show dense structures (bone appears white, air appears black). Standard views include AP (anteroposterior) and lateral projections. Chest X-rays assess heart size, lung fields, and mediastinal structures.

CT (computed tomography) provides cross-sectional images with excellent bone and soft tissue detail. CT is the first-line imaging for trauma, stroke, and many acute conditions. Contrast agents enhance vascular structures.

MRI (magnetic resonance imaging) provides superior soft tissue contrast without ionizing radiation. T1-weighted images show anatomy (fat appears bright), while T2-weighted images highlight pathology (fluid appears bright). MRI is the gold standard for brain, spine, and joint imaging.