Which of the following best describes the function of a densitometer?

The function of a densitometer is primarily to assess image quality and density in radiographic films or digital images. This instrument measures the optical density of radiographic images, allowing technicians to evaluate how effectively the image captures and displays the details of the anatomical structures. By analyzing the density, which is influenced by the amount of radiation exposure, a densitometer helps ensure that the images produced meet the appropriate diagnostic standards.

In the context of radiography, image quality is paramount as it directly affects the ability to make accurate diagnoses. A densitometer enables the operator to adjust exposure settings or processing techniques based on the density measurements. This helps in maintaining consistency in image quality across different exposures and ensures that the images are neither overexposed nor underexposed.

Other choices do not describe the primary function of a densitometer accurately. Measuring radiation levels pertains to radiation safety protocols rather than image assessment. Calibrating X-ray machines relates to equipment maintenance and technical functions, while providing patient comfort is focused on the patient experience during imaging procedures, which doesn't involve the use of a densitometer. Therefore, assessing image quality and density accurately reflects the role and function of a densitometer in the field of radiography.