Which process is used to correct slight exposure errors?

• A. Rescaling
• B. Digitization
• C. Lookup table (LUT) adjustments
• D. Histogram analysis

Answer: (A)

When exposure isn’t perfect, adjusting the overall brightness of the image is the most direct fix. Rescaling changes the full set of pixel values by stretching or compressing them across the displayable grayscale range (often with a small shift), so the image uses the available dynamic range more effectively. This brings the image into a better diagnostic range without altering the relative contrast between structures, which is exactly how slight exposure errors are corrected in digital radiography.

Digitization is simply converting the analog signal to digital form, so it doesn’t address exposure after the fact. Lookup table adjustments can influence brightness by remapping grayscale values, but the specific adjustment for compensating a slight exposure error is the rescaling that redefines the overall intensity range. Histogram analysis helps assess whether exposure is off and guides adjustments, but it’s the rescaling step that actually corrects the brightness of the image.