Browse Prior Art Database

MICROWAVE BREAST IMAGING SYSTEM USING SOFTWARE DEFINED RADIO

IP.com Disclosure Number: IPCOM000249461D
Publication Date: 2017-Feb-28
Document File: 4 page(s) / 93K

Publishing Venue

The IP.com Prior Art Database

Abstract

A microwave breast imaging system using software defined radio is disclosed. The system comprises a microwave imaging sub-system and software defined radios (SDR). The microwave imaging subsystem is implemented with SDR to generate, modulate, receive and demodulate single side band suppressed carrier (SSB-SC) signals. The architecture of the system has distributed radiofrequency (RF) front ends, distributed signal processing blocks and a reference signal distribution method for phase correction to implement effectively a synchronous 16 channel transmit/parallel receive system.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

MICROWAVE BREAST IMAGING SYSTEM USING SOFTWARE DEFINED RADIO

BACKGROUND

 

The present disclosure relates generally to microwave imaging and more particularly to a microwave breast imaging system using software defined radio (SDR).

Microwave  imaging  is  an attractive  diagnostic  modality  for   medical  applications because of  being  low-¬≠cost and  using  non-ionizing  radiation. Microwave  imaging  and   diagnostic  technique  works  on  the  principle  of  near-field  radar. As  microwaves  propagate  through  the  human  body,  they  go  through   different  tissues  which  have  different  electrical  properties. At the interface of    different layers of tissue inside the body, scattering occurs.  Also, an abnormality  in  the  human  body creates  a  certain contrast  in  the  electrical  properties that is discernable when compared  with  the  normal   tissues.  The abnormality may be bleeds, clots, edema or tumor.

Since at microwave frequencies, the contrast generated by abnormalities is significant, microwave is a suitable modality for the detection of abnormalities.  For measuring  the scattering due to different electrical properties of tissues, conventional techniques include measuring  the  reflection  coefficient at  several  antennas  surrounding  the  body  of  interest, using  a   vector  network  analyzer  (VNA).  

However using a VNA makes the imaging system bulky and costly since it requires many components such as signal generators, mixers, and amplifiers. Using a bulky system in a medical setting presents various challenges. A compact and portable hardware is desired so that the system to be used in ambulances, other emergency settings and in other regular medical environments without posing excessive space constraints.

It would be desirable to have a compact microwave imaging system.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 is a scaled down 4-channel schematic of a microwave breast imaging system using software defined radio.

DETAILED DESCRIPTION

A microwave breast imaging system using software defined radio is disclosed. The system comprises a microwave imaging sub-system and software defined radios (SDR). The microwave imaging subsystem is implemented with SDR to generate, modulate, receive and demodulate single side band suppressed carrier (SSB-SC) signals. The architecture includes distributed radiofrequency (RF) front ends, distributed signal processing blocks and a reference signal distribution method for phase correction to implement effectively a synchronous 16 channel transmit/parallel receive system.

An SDR is programmed to generate a specific intermediate frequency (IF), for example of 100 kHz. IF is mixed both in phase and quadrature signals with local oscillator (LO), for example of 1.3 GHz to generate SSB-SC signal at 1.3GHz+100kHz. This signal goes through a 1:16 switch. By selecting one of the outputs of the switch, the transmit signal is direc...