Sensing probe for 3–6 GHz microwave imaging systems

International Journal of Biomedical Imaging

2016

141

Breast cancer is a disease that occurs most often in female cancer patients. Early detection can significantly reduce the mortality rate. Microwave breast imaging, which is noninvasive and harmless to human, offers a promising alternative method to mammography. This paper presents a review of recent advances in microwave imaging for breast cancer detection. We conclude by introducing new research on a microwave imaging system with time-domain measurement that achieves short measurement time and low system cost. In the time-domain measurement system, scan time would take less than 1 sec, and it does not require very expensive equipment such as VNA.

Section: Microwave Breast Imagingmentioning

confidence: 99%

Recent Advances in Microwave Imaging for Breast Cancer Detection

Kwon

International Journal of Biomedical Imaging

2016

141

“…The temperature control device unit for temperature control can be achieved through the good performance in the MT system. [3][4][5][6][7][8][9][10]. Therefore, UWB antenna with notched characteristics at these frequency bands is required.…”

Section: Resultsmentioning

confidence: 99%

Stabilization effect by the temperature of immersion liquid in the 3–6 GHz microwave tomography system

Kim

Micro & Optical Tech Letters

Kim

et al. 2015

A study on temperature stabilization effect of the immersion liquid in a 3‐6 GHz microwave tomography (MT) system for medical diagnosis is presented. The designed temperature control device unit is applied in the MT system for the analysis of the temperature impact. This control unit with an advanced control method is required to precisely maintain the temperature of the immersion liquid for obtaining stable measurement data. If the temperature of the liquid is maintained ideally, the peak to peak deviation of the measured amplitude and phase are very small within approximately 0.18 dB and 1.3 degree over the entire frequency range. The temperature variation of the liquid is a key factor for high spatial resolution to detect small tumors. The detailed results are presented and discussed. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:461–464, 2016

“…It is composed of a double-ridged waveguide and an aperture. The waveguide is filled with ceramic, and the aperture is a tapered ridge (Lee et al, 2014). Figure 4 is the S11 graph when the antenna is immersed in soybean oil.…”

Section: Experimental System Setupmentioning

confidence: 99%

Experimental Demonstration of In‐Place Calibration for Time Domain Microwave Imaging System

Kwon

2018

Radio Science

In this study, the experimental demonstration of in‐place calibration was conducted using the developed time domain measurement system. Experiments were conducted using three calibration methods—in‐place calibration and two existing calibrations, that is, array rotation and differential calibration. The in‐place calibration uses dual receivers located at an equal distance from the transmitter. The received signals at the dual receivers contain similar unwanted signals, that is, the directly received signal and antenna coupling. In contrast to the simulations, the antennas are not perfectly matched and there might be unexpected environmental errors. Thus, we experimented with the developed experimental system to demonstrate the proposed method. The possible problems with low signal‐to‐noise ratio and clock jitter, which may exist in time domain systems, were rectified by averaging repeatedly measured signals. The tumor was successfully detected using the three calibration methods according to the experimental results. The cross correlation was calculated using the reconstructed image of the ideal differential calibration for a quantitative comparison between the existing rotation calibration and the proposed in‐place calibration. The mean value of cross correlation between the in‐place calibration and ideal differential calibration was 0.80, and the mean value of cross correlation of the rotation calibration was 0.55. Furthermore, the results of simulation were compared with the experimental results to verify the in‐place calibration method. A quantitative analysis was also performed, and the experimental results show a tendency similar to the simulation.