Use of radio astronomy techniques in the analysis of acoustic phased array signals from the body...
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Use of radio astronomy techniques in the analysis of acoustic phased array signals from the body Stephen Hughes, Madeleine McIntyre, Sanjay Mishra, Queensland
Use of radio astronomy techniques in the analysis of acoustic
phased array signals from the body Stephen Hughes, Madeleine
McIntyre, Sanjay Mishra, Queensland University of Technology Steven
Tingay, Curtin University of Technology, Perth, WA Graham Tronc,
Wesley Hospital, Brisbane Suresh R. Devasahayam, Christian Medical
Centre, Vellore, India NRAO / AUI / NSF
Slide 2
Research question Is it possible to use the correlation
techniques used in radio astronomy to extract diagnostic
information from sounds generated naturally in the body e.g.
leaking blood vessels, fetal heart rate, cancer cell death during
chemotherapy, etc? Pinard stethoscope being used to listen to fetal
heart beats in India
Slide 3
At the Paul Wild Observatory, Narribri, NSW, radio signals are
collected using a phased array of six 22- m radio dishes Signals
received at the focus of each dish are amplified using cryogenic
electronics Digitised signals are sent to the control building via
fibre optic cable.. and correlated by a hardware correlator.
Slide 4
Wavefront from space Radio dishes 1 2 ctct Wavefronts coming in
at a slightly different angle to each other Radio dishes Radio
image of a spiral galaxy
Slide 5
+ +9V -9V 10 k to ADC 10 k 150 k Electret microphone 100 k 24.1
nF Four channels, simultaneous sampling, 100 kHz, 16-bit
Slide 6
Slide 7
Time domain signal of abdominal recording from a pregnant
mother Autocorrelation function Some structure present which may be
due to the maternal and fetal heart beat
Slide 8
Ch1 Ch2 FFT Filter Complex conjugate IFFTCCF Software
correlator pipeline Software based on the DiFX correlator developed
by Tingay et al. (PERL -> Matlab -> Scilab)
Slide 9
Heart sound no gel Heart sound gelSpectrum of heart sound gel
Plastic holder for electret microphone with gel interface Filtered
heart sound gel
Slide 10
Research plan (cancer) Build an array acoustic sensors (e.g.
microphones/accelerometers/piezoelectric elements) Develop software
to calculate the CCF of multiple sensor baselines can an acoustic
image be generated? See if it is possible to detect cancer cells
dying as a result of chemotherapy drugs Develop a system for the
early detection of the efficacy or otherwise of chemotherapeutic
agents Investigate ways of being able to transmit acoustic data
over wireless networks to a central correlator facility Tumor
Acoustic phased array