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.
household electricity use 6000 kwh per household per year for 3 residents average per household so the household use per capita is 2000 kwh or about of per capita electricity from all applications household natural gas use 400 therms per household x 30 give 12000 kwh equivalent electricitysince much of the electricity is generated by natural gas it is not totally unreasonable to compare these two in kilowatt hoursousehold natural gas use 400 therms per household x 30 give 12000 kwh equivalent electricity since much of the electricity is generated by natural gas it is not totally unreasonable to compare these two in kilowatt hours