Showing papers on "Imaging technology published in 1983"
TL;DR: The reconstruction problem due to nonlinear and nonplanar current paths in impedance imaging is overcome by solving Laplace's equation numerically for every iteration and by using a new back-projection algorithm to modify the impedance profile.
Abstract: In this paper, we propose to develop a new imaging technology, computerized impedance tomography (CIT) for imaging the thorax. Our study involves reconstructing images of thoracic transverse plane impedance distributions noninvasively and nondestructively and exploring the potential of CIT. We overcome the reconstruction problem due to nonlinear and nonplanar current paths in impedance imaging by solving Laplace’s equation numerically for every iteration and by using a new back-projection algorithm to modify the impedance profile. We discuss advantages and disadvantages associated with impedance imaging, the computer model, and back-projection algorithms used in reconstructing impedance images. We present reconstructed impedance images with 8 projection angles and different projection methods. We identify important variables affecting the quality of reconstructed images, and discuss the resolution and accuracy of this imaging technique. We summarize numerical aspects, computer requirements, and limitation...
76 citations
33 citations
4 citations
13 Dec 1983
TL;DR: In this paper, a new imaging technology, computerized impedance tomography (CIT), was proposed for imaging the thorax of the human body, which can reconstruct the impedance images of the body noninvasively and non-destructively for the frontal plane, the transverse plane, and eventually three dimensions.
Abstract: In this paper, we survey existing various impedance techniques and we propose to develop a new imaging technology, computerized impedance tomography (CIT),for imaging the thorax. By applying high-frequency current and measuring its distribution, it should be possible to reconstruct the impedance images of the body noninvasively and nondestructively for the frontal plane, the transverse plane, and eventually three dimensions. We overcome difficulties in the reconstruction procedure due to nonlinear and nonplanar current paths by solving Laplace's equation numerically in our model for every iteration and by using a nonlinear back-projection reconstruction algorithm to obtain the impedance image iteratively. Results of our simulation study with computer-generated phantom objects in the computer model indicate that reasonable impedance images in one transverse plane of the thorax can be obtained with 8 current projections. We discuss advantages and disadvantages associated with impedance imaging, the computer model, important variables affecting the quality of reconstructed impedance images, and back-projection algorithms used in reconstructing impedance images. We present reconstructed impedance images with 8 projection angles and different projection methods. We summarize numerical aspects, computer requirements, and limitations of impedance imaging. We also discuss the future of impedance imaging.
1 citations
TL;DR: In this article, NMR imaging is described as a potentially useful technology that is coupled with superconductivity in an appl icat ion t h a t possibly is t h e f i r s t time the general public comes into contact with this phenomenon.
Abstract: increasing standards of safety, convenience, comfort and health while an overlapping segment i s susp ic ious of or hostile to the technology capable of better serving these demands or needs. N M R imaging i s one such technology, hailed on one hand as a breakthrough and on the other as a fur ther f inancial burden on the health system or as a source of unknown hazards. As i s usual with t h i s kind ,of uninformed evaluation, nei ther of these assessments i s c o r r e c t . As we shal l see below, NMR imaging i s a potentially useful technology that is in t imately coupled to superconductivity in an appl icat ion t h a t possibly is t h e f i r s t time t h a t the general public comes into contact with this phenomenon. substant ia l segments o f the population demand
1 citations