How do CT scans use X-rays to create 3D images?

CT scans use X-rays to create 3D images by taking multiple 2D X-ray images from different angles.

CT (computed tomography) scans use X-rays to create detailed 3D images of the inside of the body. The patient lies on a table that slides into a doughnut-shaped machine called a CT scanner. The scanner rotates around the patient, taking multiple 2D X-ray images from different angles. These images are then processed by a computer to create a 3D image of the body part being scanned.

X-rays are a type of electromagnetic radiation that can penetrate through the body and are absorbed differently by different tissues. Dense tissues such as bones absorb more X-rays, while softer tissues such as organs absorb fewer X-rays. This difference in absorption is what allows the CT scanner to create detailed images of the inside of the body.

The computer uses a technique called back projection to create the 3D image from the 2D X-ray images. It takes the information from each X-ray image and uses it to create a 3D image of the body part being scanned. The resulting image can be viewed from different angles and can show detailed structures such as blood vessels, organs, and bones.

In conclusion, CT scans use X-rays to create 3D images by taking multiple 2D X-ray images from different angles and processing them with a computer. This technique allows for detailed images of the inside of the body to be created, which can aid in diagnosis and treatment planning.