I'm newbie in Computer Vision and image processing.
I'm reading the article "Automated White Matter Hyperintensity Detection in Multiple Sclerosis Using 3D T2 FLAIR" and it said:
2.2.4. WMH Segmentation with High Spatial Frequency Suppression
White matter lesions have higher intensity and generally clear boundaries relative to the surrounding WM. Unfortunately, in the 3D T2 FLAIR images, the GM can also present with high signal intensity, especially in elderly people.
What does it means "higher intensity" and "high signal intensity"?
I think it means that white matter lesions are very white but I'm not sure because I don't understand why the use the words "intensity" and "signal" when they are talking about images.