The amount of heat generated by SPIONs under external magnetic field is denoted as the specific absorption rate (SAR). SAR is the radio frequency electromagnetic field absorbed per unit of mass of biological tissue and is expressed in watts per kilogram (W/kg).
SAR is described in 2 ways in different literatures:
1) SAR(w/g)=(c/m).(dT/dt)
2) SAR (w/g)= c. ΔT/Δt
Which one of these equations are the right one for SAR measuermetnts? how we can have 2 equation for a single physical parameter ??
All the best
Actually the SAR (specific absorption rate) is the specific loss power per unit mass of the magnetic nanoparticle under the action of an external oscillatory magnetic field H
SAR= (1/ρ) f Ms H
where ρ means mass density, f frequancy and Ms the magnetization saturation. This electromagnetic power by means of hysteresis loop transformed in heat is delivered to the medium as your first definition
SAR(w/g)=(c/m).(dT/dt)
The second is assuming an unitary mass m=1 in the system of units, or in other case is wrong.
SAR (W/kg)= Cv*ΔT/Δt , where Cv is the volumetric specfic heat. SAR can be derived from Penne's bioheat equation for the case when assuming no thermal conduction ΔT/Δr = 0, where r is the spatial vector incorporating x.y and z.
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