What is the Nyquist frequency in relation to CR/DR sampling?

The Nyquist frequency is an important concept in the field of digital imaging, particularly in computed radiography (CR) and digital radiography (DR). It refers specifically to the maximum frequency that can be accurately sampled without introducing errors, often referred to as aliasing. According to the Nyquist theorem, to avoid this aliasing, a signal must be sampled at least twice the highest frequency present in the signal.

Though the option stating that the Nyquist frequency eliminates moire artifacts may seem accurate in a specific context, it is the maximum sampling frequency that ensures the integrity of the image data captured. When sampling happens below this frequency, artifacts can emerge—as a result, proper calibration of sampling according to the Nyquist frequency is necessary to produce high-quality images.

While the other options touch on different aspects of imaging and sampling, they do not specifically define the Nyquist frequency, which focuses on the relationship between sampling rates and the preservation of image quality by avoiding aliasing and potential artifacts. The Nyquist frequency ensures that the sampling captures the full range of frequencies contained in the original signal, enabling accurate image reconstruction without the risk of misrepresentations.