1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Model-based microwave image reconstruction: simulations and experiments
Rent:
Rent this article for
USD
10.1118/1.1812871
/content/aapm/journal/medphys/31/12/10.1118/1.1812871
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/31/12/10.1118/1.1812871

Figures

Image of FIG. 1.
FIG. 1.

The comparison between exact (dots) and numerical results (triangles, crosses, and diamonds) obtained for electric field (TM) corresponding to a dielectric cylinder and different finite element mesh sizes. The number of nodes used is 422 (triangles), 312 (crosses) and 489 (diamonds).

Image of FIG. 2.
FIG. 2.

Block diagram of our microwave tomographic imaging (MTI) system: 1—antennas; 2—coupling medium; 3—multiplexer; 4—lock-in amplifier; 5—single side band modulator; 6—quadrature signal generator; 7—RF-source; 8—power divider; 9—attenuator; 10—mixer; and 11—computer.

Image of FIG. 3.
FIG. 3.

Photograph of the entire MTI system: 1—antennas; 4—lock-in amplifier; 3—multiplexer; and 12—spectrum analyzer.

Image of FIG. 4.
FIG. 4.

Photograph of the water tank and antenna array during a phantom imaging experiment: 1—antennas; 2—coupling medium; 13—phantom; and 14—sample support.

Image of FIG. 5.
FIG. 5.

Geometry of the phantoms used in the experiments. R1—the radius of the antenna array; R2—the phantom radius; R3—the inclusion radius, and D—the distance between the centers of the phantom and the inclusion. The values of R1, R2, R3, and D in each experiment are given in Table I.

Image of FIG. 6.
FIG. 6.

The finite element mesh used in the image reconstructions (324 nodes and 582 elements).

Image of FIG. 7.
FIG. 7.

Reconstructed microwave images based on simulated data: (a) Case 1 (an inclusion diameter of ); (b) Case 2 (an inclusion diameter of ); and (b) Case 3 (an inclusion diameter of ).

Image of FIG. 8.
FIG. 8.

Comparison between reconstructed (dotted lines) and exact (solid lines) profiles from the simulated images shown in Fig. 7. (a) and (b) along transects AB and CD, respectively, for Case 1. (c) and (d) Along transects AB and CD, respectively, for Case 2. (e) and (f) Along transects AB and CD, respectively, for Case 3.

Image of FIG. 9.
FIG. 9.

Reconstructed microwave images based on experimental data: (a) Case 1 (an inclusion diameter of ); (b) Case 2 (an inclusion diameter of ); and (b) Case 3 (an inclusion diameter of ).

Image of FIG. 10.
FIG. 10.

Comparison between reconstructed (dotted lines) and exact (solid lines) profiles from the experimental images shown in Figs. 9(a) and 9(b). Along transects AB and CD, respectively, for Case 1. (c) and (d) Along transects AB and CD, respectively, for Case 2. (e) and (f) Along transects AB and CD, respectively, for Case 3.

Tables

Generic image for table
TABLE I.

Electrical properties and dimensions of the phantoms used in this study. The geometric parameters (R1, R2, R3, and D) are shown in Fig. 5.

Generic image for table
TABLE II.

(a) Recovered geometric parameters from both experimental and simulated data (along transect CD in direction). (b) Recovered geometric parameters from both experimental and simulated data (along transect AB in direction).

Generic image for table
TABLE III.

Standard deviation and median value for absolute differences between exact and reconstructed values obtained from reconstructed images based on experimental and simulated data.

Loading

Article metrics loading...

/content/aapm/journal/medphys/31/12/10.1118/1.1812871
2004-11-12
2014-04-16
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Model-based microwave image reconstruction: simulations and experiments
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/31/12/10.1118/1.1812871
10.1118/1.1812871
SEARCH_EXPAND_ITEM