Inverse solution of thermoacoustic wave equation for cylindrical layered media

Thermoacoustic imaging is a crossbred approach taking advantages of electromagnetic and ultrasound disciplines, together. A significant number of current medical imaging strategies are based on reconstruction of source distribution from information collected by sensors over a surface covering the region to be imaged. Reconstruction in thermoacoustic imaging depends on the inverse solution of thermoacoustic wave equation. Homogeneous assumption of tissue to be imaged results in degradation of image quality. In our paper, inverse solution of the thermoacoustic wave equation using layered tissue model consisting of concentric annular layers on a cylindrical cross-section is investigated for cross-sectional thermoacustic imaging of breast and brain. By using Green’s functions and surface integral methods we derive an exact analytic inverse solution of thermoacoustic wave equation in frequency domain. Our inverse solution is an extension of conventional solution to layered cylindrical structures. By carrying out simulations, using numerical test phantoms consisting of thermoacoustic sources distributed in the layered model, our layered medium assumption solution was tested and benchmarked with conventional solutions based on homogeneous medium assumption in frequency domain. In thermoacoustic image reconstruction, where the medium is assumed as homogeneous medium, the solution of nonhomogeneous thermoacoustic wave equation results in geometrical distortions, artifacts and reduced image resolution due to inconvenient medium assumptions

Inverse solution of thermoacustic wave equation for cylindirical multi-layer mediums

Termoakustik görüntüleme, elektromanyetik enerji uyarımı ile ultrason dalgaları oluşumunu sağlayan yeni bir yöntemdir. Bu sistemin görüntüleme işlemi termoakustik dalga denkleminin ters çözümüne dayanmaktadır. Ters çözümde görüntülenecek dokunun homojen yapıda olduğu varsayımı, görüntü kalitesinin azalmasına neden olur. Bu çalışmada, meme ve beyinin görüntülemesinde uygulanabilecek üç boyutlu eş merkezli silindirik çok katmanlı yapılar için termoakustik dalga denkleminin analitik ters çözümü elde edilmiştir. Çözümü sayısal olarak test etmek için, noktasal kaynaklar içeren üç katmanlı fantom kullanılarak numerik simulasyonlar elde edilmiştir.Thermoacoustic imaging is a new modality of generating ultrasonic waves with excitation of electromagnetic pulsed energy. Thermoacoustic imaging is based on the inverse soluion of thermoacoustic wave equation. Homogeneous assumption of tissue to be imaged results in degradation of image qualtiy. In this study, we obtain an analytical inverse solution of thermoacoustic wave equation for 3-dimensional concentric cylindrical multi layer structures. This solution can be applied for imaging of breast and brain. To test our solution, we use a 3-layer test phantom consisting of point sources in numerical simulations.Publisher's Versio

Inverse Solution of Thermoacustic Wave Equation for Cylindirical Multi-Layer Mediums

25th Signal Processing and Communications Applications Conference (SIU) -- MAY 15-18, 2017 -- Antalya, TURKEYWOS: 000413813100597Thermoacoustic imaging is a new modality of generating ultrasonic waves with excitation of electromagnetic pulsed energy. Thermoacoustic imaging is based on the inverse soluion of thermoacoustic wave equation. Homogeneous assumption of tissue to be imaged results in degradation of image qualtiy. In this study, we obtain an analytical inverse solution of thermoacoustic wave equation for 3-dimensional concentric cylindrical multi layer structures. This solution can be applied for imaging of breast and brain. To test our solution, we use a 3-layer test phantom consisting of point sources in numerical simulations.Turk Telekom, Arcelik A S, Aselsan, ARGENIT, HAVELSAN, NETAS, Adresgezgini, IEEE Turkey Sect, AVCR Informat Technologies, Cisco, i2i Syst, Integrated Syst & Syst Design, ENOVAS, FiGES Engn, MS Spektral, Istanbul Teknik Uni

Inverse solution of thermoacustic wave equation for cylindirical multi-layer mediums [Çok Katmanli Silindirik Yapilar İçin Termoakustik Dalga Denkleminin Ters Çözümü]

25th Signal Processing and Communications Applications Conference, SIU 2017 -- 15 May 2017 through 18 May 2017 -- -- 128703Thermoacoustic imaging is a new modality of generating ultrasonic waves with excitation of electromagnetic pulsed energy. Thermoacoustic imaging is based on the inverse soluion of thermoacoustic wave equation. Homogeneous assumption of tissue to be imaged results in degradation of image qualtiy. In this study, we obtain an analytical inverse solution of thermoacoustic wave equation for 3-dimensional concentric cylindrical multi-layer structures. This solution can be applied for imaging of breast and brain. To test our solution, we use a 3-layer test phantom consisting of point sources in numerical simulations. © 2017 IEEE