// multi-utility computation suite · offline · instant · precise
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med.MRI-B1-flip-angle Calculator
Calculates the SAR (Specific Absorption Rate) and maximum allowable flip angle for an MRI pulse sequence from B1 field strength and pulse parameters. Exceeding SAR limits causes tissue heating — this is a hard safety constraint in MRI protocol design.
Inputs
Sar Limit W Kg
Reference formula or conversion factor shown for context.
Tr Ms
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Body Mass Kg
Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
Flip Angle Deg
Reference formula or conversion factor shown for context.
Results
relative RF power (sin²(α/2)/TR)
The value at the specified point or condition.
duty cycle (3ms RF pulse)
Reference formula or conversion factor shown for context.
E1 recovery factor (T1=1s)
A dimensionless multiplier applied in the calculation.
SAR ∝ sin²(α/2)/TR
Sample size or count used in the calculation.
SAR compliance
Sample size or count used in the calculation.
IEC limits
Reference formula or conversion factor shown for context.