What term describes the basic measurable data carrying image information about the object?

• A. signal
• B. postprocessing
• C. spatial resolution
• D. dynamic range

Answer: (A)

The basic measurable data carrying image information about the object is the signal. In imaging systems, the detector converts the object's radiance or intensity distribution into an electrical signal whose amplitude encodes the image content. This raw signal is the fundamental data that carries the image information and is what gets transformed through processing to form the final image. Postprocessing is the manipulation applied after data capture, not the data itself. Spatial resolution concerns how finely details are separated, and dynamic range describes the range of detectable intensities; neither defines the raw data that carries the image content.