Cylindrical geometry: a further step in active microwave tomography
A prototype imaging system for active microwave tomography using cylindrical geometry has been developed, making it possible to obtain images of the dielectric properties of biological targets at 2.45 GHz. This configuration allows a fast exploration of body slices placed along the array axis, in a...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 1991 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/2062 |
| Acceso en línea: | https://hdl.handle.net/2117/2062 |
| Access Level: | acceso abierto |
| Palabra clave: | Microwaves Electromagnetic waves Diagnosis Radiation Radioactivity Biology Image processing Biomedical equipment Computerised picture processing c¡Computerised tomography Electromagnetic compatibility Medical diagnostic computing Microwave imaging 2.45 GHz EMC UHF Active microwave tomography Array axis Biological targets Body slices Cylindrical geometry Detection techniques Dielectric properties High-frequency architectures High-level illuminating signal Low-power illumination Prototype imaging system Microones Ones electromagnètiques Radiació Radioactivitat Diagnòstic Imatge -- Processament Biologia Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció |
| Sumario: | A prototype imaging system for active microwave tomography using cylindrical geometry has been developed, making it possible to obtain images of the dielectric properties of biological targets at 2.45 GHz. This configuration allows a fast exploration of body slices placed along the array axis, in a way similar to that of present X-ray scanners. The electromagnetic compatibility (EMC) of this approach is critical because the strongly attenuated received fields are measured on the same array which is being used to emit a high-level illuminating signal. Therefore, carefully designed high-frequency architectures and detection techniques are necessary. The system requires no mechanical movements to illuminate the body from multiple directions (views) and measure the scattered fields. In this way, a complete data set consisting of 64 views is acquired in 3 s using low-power illumination. The system is described, and images obtained with biological phantoms and actual bodies are presented. |
|---|