Low contrast is defined by:

Low contrast is defined by:

• A. Short gray-scale and many shades of gray
• B. Long gray-scale and many shades of gray
• C. Short gray-scale and few shades of gray
• D. Long gray-scale and few shades of gray

Answer: (B)

In radiography, contrast depends on how many gray tones the image shows. Low contrast means there are many subtle differences between tissue densities, so the image displays a broad range of brightness levels with lots of midtones. This is described as a long gray-scale with many shades of gray, which makes distinguishing similar tissues harder because the transitions between them are gradual. The other descriptions don’t fit: a short gray-scale implies few brightness levels and high contrast; short-gray-scale with many shades or long-gray-scale with few shades mix incompatible terms and don’t reflect the broad range of tones characterizing low contrast.

In radiography, contrast depends on how many gray tones the image shows. Low contrast means there are many subtle differences between tissue densities, so the image displays a broad range of brightness levels with lots of midtones. This is described as a long gray-scale with many shades of gray, which makes distinguishing similar tissues harder because the transitions between them are gradual.

The other descriptions don’t fit: a short gray-scale implies few brightness levels and high contrast; short-gray-scale with many shades or long-gray-scale with few shades mix incompatible terms and don’t reflect the broad range of tones characterizing low contrast.