Finite-element simulation of ultrasound brain surgery: effects of frequency, focal pressure, and scanning path in bone-heating reduction

• Authors: Sohrab Behnia , Amin Jafari , Farzan Ghalichi , Ashkan Bonabi
• Languages of publication: EN

Abstracts

EN

In this paper, the finite-element method (FEM) simulation of ultrasound brain surgery is presented. The overheating problem of the post-target bone, which is one of the limiting factors for a successful ultrasound brain surgery, is considered. In order to decrease bone heating, precise choices of frequency, focal pressure, and scanning path are needed. The effect of variations in the mentioned scanning parameters is studied by means of the FEM. The resulting pressure and temperature distributions of a transdural ultrasound brain surgery are simulated by employing the FEM for solving the Helmholtz and bioheat equations in the context of a two-dimensional MRI-based brain model. Our results show that for a suitable value of the frequency, an increase in focal pressure leads to a decrease in the required duration of the treatment and is associated with less heating of the surrounding normal tissue. In addition, it is shown that at a threshold focal pressure, the target temperature reaches toxic levels whereas the temperature rise in the bone is minimal. Wave reflections from sinus cavities, which result in constructive interference with the incoming waves, are one of the reasons for overheating of the bone and can be avoided by choosing a suitable scanning path.

Keywords

EN

ultrasound brain surgery; bone overheating; finite-element method; Helmholtz equation; bioheat equation

Discipline

• 87.50.yt: Therapeutic applications
• 02.70.Dh: Finite-element and Galerkin methods

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2008
• Volume: 6
• Issue: 2
• Pages: 211-222

Dates

published

1 - 6 - 2008

online

26 - 3 - 2008

Contributors

author

Sohrab Behnia

• Department of Physics, IAU, Urmia, Iran

author

Amin Jafari

• Department of Physics, Urmia University, Urmia, Iran

author

Farzan Ghalichi

• Department of Biomedical Engineering, Sahand University, Sahand, Iran

author

Ashkan Bonabi

• Department of Physics, IAU, Urmia, Iran

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Identifiers

DOI

10.2478/s11534-008-0015-3