Apparent Diffusion Coefficient (ADC) imaging is used with DWI to provide:

Apparent Diffusion Coefficient (ADC) imaging is used with DWI to provide:

• A. Quantifies diffusion to provide more specific information
• B. Measures blood flow
• C. Shows T1 relaxation
• D. Detects bone density

Answer: (A)

The main idea is that ADC imaging gives a numerical measure of how freely water molecules move in tissue. Diffusion-weighted imaging shows where diffusion appears restricted, but that signal can be influenced by other factors, so calculating the ADC map from multiple diffusion weightings provides a more specific, quantitative assessment of diffusion. This helps distinguish different tissue states, such as cytotoxic edema in acute stroke, where diffusion is markedly restricted and ADC values drop, from vasogenic edema or other conditions where diffusion is less restricted and ADC is higher. The other options describe blood flow (perfusion), T1 relaxation, or bone density—none of which are about measuring diffusion—so they don’t apply here.

The main idea is that ADC imaging gives a numerical measure of how freely water molecules move in tissue. Diffusion-weighted imaging shows where diffusion appears restricted, but that signal can be influenced by other factors, so calculating the ADC map from multiple diffusion weightings provides a more specific, quantitative assessment of diffusion. This helps distinguish different tissue states, such as cytotoxic edema in acute stroke, where diffusion is markedly restricted and ADC values drop, from vasogenic edema or other conditions where diffusion is less restricted and ADC is higher. The other options describe blood flow (perfusion), T1 relaxation, or bone density—none of which are about measuring diffusion—so they don’t apply here.