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tissue ablation model by comsol

Concerning the tumor ablation model, can someone tell how to get the volume of tissue heated within an isothermal surface. In the model an isothermal surface of 50˚C was done after 8minutes, however, I...

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Re: tissue ablation model by comsol

Ejiro, Under Definitions/Component Coupling/Integration, define operator “intop1” on the domain Geometric level. Then define variable volume_iso=intop1(T>=50[degC]) to get the volume of tissue...

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Re: tissue ablation model by comsol

Thank you!

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Re: tissue ablation model by comsol

I later wanted to plot the isothermal volume in temperature ranges: 40˚C<T<50˚C vs time. I do this but get a straight line (attached). I used this on the expression section:...

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Re: tissue ablation model by comsol

Ejiro, To calculate this volume use to following expression: intop1(T>=40[degC])-intop1(T>=50[degC]) Regards, Sergei

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Re: tissue ablation model by comsol

Thanks again. How can I calculate thermal dose for the tissue ablation model using COMSOL. The mathematical calculation for thermal dose is attached. I ultimately want to plot the thermal dose as a...

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Re: tissue ablation model by comsol

Ejiro, To calculate thermal dose: -add Domain ODEs and DAEs node -add Distributed ODE sub-node and define source term as f=(1/3600)*(0.25*(T<=Tr)+0.5*(T>Tr))^(Tr-T). Leave damping and mass...

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Re: tissue ablation model by comsol

Thanks. Yes I had to add another study step. How do I get a 2D plot of this data. I seem to be having trouble calling the solution of the thermal dose in the result node.

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Re: tissue ablation model by comsol

Ejiro, Make sure that solver set up for the thermal dose calculation step is correct. In the Values of Dependent Variables section, check the box “Values of variables not solved for”. From Method...

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Re: tissue ablation model by comsol

Thanks Sergei for the response. Unfortunately I have still not gotten the results. I attached the steps I took in finding the thermal dose. Is there something I missed?

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Re: tissue ablation model by comsol

Ejiro, Not sure why you are getting incorrect result but if you are still not able to resolve the issue then you might try to calculate the thermal damage integral in the post-processing using operator...

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