Thermal apoptosis analysis considering injection behavior optimization and mass diffusion during magnetic hyperthermia

Abstract

Thermally induced apoptosis for tumors depends mainly on the intrinsic characteristics of biological tissues as well as treatment temperature profile during magnetic hyperthermia. Further, treatment temperature distribution inside tumor depends on the injection behavior of irregular tumors, such as the injection dose and the injection location of nanofluids. In order to improve the treatment effect, the simulated annealing algorithm is adopted in this work to optimize the nanofluid injection behavior, and the improved Arrhenius model is used to evaluate the malignant ablations for three typical malignant tumor cell models. In addition, both the injection behavior optimization and the mass diffusion of nanofluid are both taken into consideration in order to improve the treatment effect. The simulation results demonstrate that the injection behavior can be optimized effectively by the proposed optimization method before therapy, the result of which can also conduce to improving the thermal apoptosis possibility for proposed typical malignant cells. Furthermore, an effective approach is also employed by considering longer diffusion duration and correct power dissipation at the same time. The results show that a better result can then be obtained than those in other cases when the power dissipation of MNPs is set to be Q MNP = 5.4 × 107 W·m3 and the diffusion time is 16 h.

Effect of porous heat transfer model on different equivalent thermal dose methods considering an experiment-based nanoparticle distribution during magnetic hyperthermia

“…It must be pointed out that the MNPs can be considered as a part of malignant tissue after the nanofluid infusion, so the thermophysical properties of tumor tissue will also change Table 1. Thermal properties for required materials [35].…”

Extraction method of nanoparticles concentration distribution from magnetic particle image and its application in thermal damage of magnetic hyperthermia

“…All parameters used for calculation in the case study considered in this study are provided in Tables 1 and 2. Table 1 shows the thermal characteristics for biological tissue, [31,32] and Table 2 lists the properties for both magnetic field and magnetic nanoparticles. [28] In addition, the parameters in the Arrhenius model are 1.19 × 10 35 s −1 for frequency factor and 232 kJ•mol −1 for the activation energy, both given for hepatoma cells as analysis object.…”