What's the difference between CT and CR? Say it simply.

1. Differences in meaning

CT, that is, computerized tomography. It is to scan one section after another around a certain part of the human body.

computer radiography (CR) is the first digital technology used in radiology photography, and it is an advanced technology formed by the combination of computer digital image processing technology and X-ray radiation technology.

2, the difference in use

CT is used in medical examination for the diagnosis of central nervous system diseases, head and neck diseases, and CT examination of heart and great vessels, abdomen and pelvic diseases; CT plays an important role in nondestructive testing and reverse engineering of modern industry. CT equipment can also be used in the detection of security, air transportation, harbor transportation and large cargo container case devices.

CR is mainly used for the display of bone structure, articular cartilage and soft tissue, the detection of mediastinal structures such as blood vessels and trachea, nodular lesions in the lung, intestinal pneumatosis, pneumoperitoneum, stones and other calcium-containing lesions, and the radiography with film as the carrier.

3. Differences in imaging principles

CT scans a certain thickness of a human body with an X-ray beam, and the X-ray transmitted through this layer is received by the detector, converted into visible light, then converted into electrical signal by photoelectric conversion, then converted into digital by analog/digital converter, and input into a computer for processing.

CR is based on the original diagnostic X-ray direct film imaging, through A/D conversion and D/A conversion, real-time image digital processing, and then the image is digitized.

Baidu encyclopedia -CT?

Baidu encyclopedia -CR