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sci.MRI-SAR-specific-absorption Calculator
Calculates specific absorption rate SAR = σE²/(2ρ) from electric field strength, tissue conductivity, and density, and checks IEC 60601-2-33 whole-body limits. Whole-body SAR limit = 2 W/kg (normal mode) — high-field MRI (7 T) increases SAR approximately as B₀², requiring careful RF pulse design.
Inputs
B1 Ut
Reference formula or conversion factor shown for context.
Sigma S M
Reference formula or conversion factor shown for context.
Rho Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Duty Pct
Fraction of each period the signal is active, as a percentage. 50% = symmetric square wave. Controls average power delivered.
F Mhz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Results
peak SAR (W/kg)
Reference formula or conversion factor shown for context.
average SAR (W/kg)
The arithmetic mean -- sum divided by count.
IEC 60601-2-33 whole-body limit
Reference formula or conversion factor shown for context.
compliance
Sample size or count used in the calculation.
SAR = σω²B₁² / (2ρ)
Reference formula or conversion factor shown for context.
B1 effective (μT)
Reference formula or conversion factor shown for context.