Mount Pleasant, South Carolina Health Index. Air quality in Mount Pleasant, South Carolina is 67 on a scale to 100 (higher is better). This is based on new measures of hazardous air pollutants from the EPA, called the National Air Toxics Assessment.
Hypoattenuation is a term used to describe areas that show up as whiter and brighter than normal on an x-ray or CT Scan. Hypoattenuating lesions are commonly referred to in regards to the liver or kidneys.
Attenuation refers to the reduction in the strength of a signal over distance. Think of the sound comming from your speaker. If you are standing right next to your speaker, the sound is very loud and strong. But, the farther you move away, the quieter the sound gets. Eventually, you won't be able to hear it at all.