Final answer:
In computed radiography (CR), the sampling frequency is expressed in terms of pixels per inch (PPI) or dots per inch (DPI). It refers to the number of digital data points or samples taken per unit length in the image, which determines the level of detail and resolution of the image.
Step-by-step explanation:
In computed radiography (CR), the sampling frequency is expressed in terms of pixels per inch (PPI) or dots per inch (DPI). It refers to the number of digital data points or samples taken per unit length in the image, which determines the level of detail and resolution of the image.
For example, a higher sampling frequency like 300 PPI means that 300 data points or samples are taken per one inch length in the image. This results in a higher level of detail and sharpness in the image.
On the other hand, a lower sampling frequency like 72 PPI means that only 72 data points or samples are taken per one inch length in the image, resulting in less detail and lower resolution.