Biomedical Engineering Reference
In-Depth Information
Narrowband (30 KHz)
Part 15 Limit
Wideband CDMA (5 MHz)
Ultra Wideband
Frequency
Fig. 3
Power level of ultra-wideband system in comparison with narrowband and wideband systems.
[
17
]
Fig. 4
The hemispherical
configuration used for breast
cancer detection. [
7
]
0
10
20
30
40
50
60
70
0
A5
A6
Free space
A4
A7
A3
A8
A2
A1
A9
Skin
Gland
Breast fat
tumor
Chest wall
20
40
60
80
10
0
120
y (mm)
Fig. 5
Detected signal for
different positions of tumor.
Thick solid line
is the average
of calibration waveform. [
7
]
0.01
E9D3
0.005
0
-0.005
-0.01
0
0.5
1
1.5
2
2.5
3
Time (ns)
The basic idea of breast cancer detection is to send an ultra-narrow low-power
pulses to the patient's body and make a decision based on the received signal by
comparing it with a reference signal, average of backscattered signals, or a signal
backscattered from normal tissues. Figure
4
shows an example in which nine antennas
are positioned on a human's breast in a hemi-spherical configuration. First, as shown
in Fig.
5
, different pulses will be emitted from each of the antennas and detected by
another antenna and location of simulated tumor is being randomly changed. Then,
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