Temperature imaging with speed of ultrasonic transmission tomography for medical treatment control: A physical model-based method

Abstract

Hyperthermia is a promising method to enhance chemo and radiation therapy of breast cancer. In the process of hyperthermia, temperature monitoring is of great importance to assure the effectiveness of treatment. The transmission speed of ultrasound in biomedical tissue changes with temperature. However, when mapping the speed of sound directly to temperature in each pixel as desired for using all speeds of ultrasound data, temperature bipolar edge enhancement artifacts occur near the boundary of two tissues with different speeds of ultrasound. After the analysis of the reasons for causing these artifacts, an optimized method is introduced to rebuild the temperature field image by using the continuity constraint as the judgment criterion. The significant smoothness of the rebuilding image in the transitional area shows that our proposed method can build a more precise temperature image for controlling the medical thermal treatment.

Adaptive optimization on ultrasonic transmission tomography-based temperature image for biomedical treatment

“…The overshoot artifacts reflect the overshoot of temperature around the boundary, which is not correct in physics. Using the same method as in our previous study, [31] we take the mean variation of adjacent values from optimized temperature image as an evaluation criterion, which is defined as…”

“…Researches on reducing overshoot artifacts normally consider the root cause of the artifacts and then perform an inverse operation. [29,30] Our previous contribution [31] proposed a method based on a physical mode. When applying our previous method, we solve a differential equation based on heat conduction rules with boundary conditions.…”

Characteristic analysis of scattering field in two-layer media by Green’s function

“…This map is very useful in nondestructive testing, [1,2] geophysics [3] or medical diagnosis. [4,5] In many practical cases, the region of interest is not composed of homogeneous media but of layered media. It is of great interest to improve the calculating capability of layered model to obtain more information about the inspected region.…”