T2* can be considered an observed or effective T2, whereas the first T2 can be considered the natural or true T2 of the tissue being imaged. T2* is always less than or equal to T2. T2* results principally from inhomogeneities in the main magnetic field.These inhomogeneities may be the result of intrinsic defects in the magnet itself or from susceptibility-induced field distortions produced by the tissue or other materials placed within the field.2* can be considered an observed or effective T2, whereas the first T2 can be considered the natural or true T2 of the tissue being imaged. T2* is always less than or equal to T2. T2* results principally from inhomogeneities in the main magnetic field.
The average electricity consumption of a US family of four is in the neighborhood of 50 kWh per day, or 1,500 kWh per month. Similar figures apply for Canada. Assuming an average electricity cost of $0.12 per kWh, that translates into about $6 per day for electricity, or $180 per month.
But most of us donât live in perfectly average households. (The state that comes closest to matching the average monthly electricity usage is Ohio). Depending on whether a state is hot or cold, urban or rural, an average household can use as little as 531 kWh a month (Maine) or as much as 1,245 kWh (Louisiana).