Abstract
Vibro-acoustography (VA) is an ultrasound-based imaging modality that uses radiation force produced by two confocal ultrasound beams separated by small frequency difference, Δf, to vibrate tissue at Δf. We used a 1.75D transducer with 12 rows and 70 columns of elements with size 0.9 x 0.9 mm. The point-spread functions (PSFs) for different configurations of the subapertures for the two frequencies centered about 5 MHz were evaluated using a numerical simulation model using Field II. Experimentally, we scanned the pressure field for different configurations using a needle hydrophone to evaluate the PSF. Finally, we scanned a urethane breast phantom and an ex vivo human prostate. We evaluated the PSFs from the simulations and needle hydrophone scans and found good agreement. We quantitatively analyzed the grating lobe levels of the PSFs for the different configurations. We compared images generated using different configurations of the subapertures in the urethane breast phantom and ex vivo human prostate. The advantage of the 1.75D array transducer is the multiple rows of elements that can be used for improving elevation focus for imaging formation. VA imaging using a 1.75D array transducer provides improved image detail and contrast due to better elevation focusing of the imaging PSF.
| Original language | English (US) |
|---|---|
| Title of host publication | IEEE International Ultrasonics Symposium, IUS |
| Pages | 672-675 |
| Number of pages | 4 |
| DOIs | |
| State | Published - 2011 |
| Event | 2011 IEEE International Ultrasonics Symposium, IUS 2011 - Orlando, FL, United States Duration: Oct 18 2011 → Oct 21 2011 |
Other
| Other | 2011 IEEE International Ultrasonics Symposium, IUS 2011 |
|---|---|
| Country | United States |
| City | Orlando, FL |
| Period | 10/18/11 → 10/21/11 |
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Keywords
- 1.75D array
- beamforming
- vibro-acoustography
ASJC Scopus subject areas
- Acoustics and Ultrasonics
Cite this
Vibro-acoustography beamforming and imaging with a 1.75D array transducer. / Urban, Matthew W; Chalek, Carl; Thomenius, Kai E.; Fatemi, Mostafa; Alizad, Azra.
IEEE International Ultrasonics Symposium, IUS. 2011. p. 672-675 6293280.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Vibro-acoustography beamforming and imaging with a 1.75D array transducer
AU - Urban, Matthew W
AU - Chalek, Carl
AU - Thomenius, Kai E.
AU - Fatemi, Mostafa
AU - Alizad, Azra
PY - 2011
Y1 - 2011
N2 - Vibro-acoustography (VA) is an ultrasound-based imaging modality that uses radiation force produced by two confocal ultrasound beams separated by small frequency difference, Δf, to vibrate tissue at Δf. We used a 1.75D transducer with 12 rows and 70 columns of elements with size 0.9 x 0.9 mm. The point-spread functions (PSFs) for different configurations of the subapertures for the two frequencies centered about 5 MHz were evaluated using a numerical simulation model using Field II. Experimentally, we scanned the pressure field for different configurations using a needle hydrophone to evaluate the PSF. Finally, we scanned a urethane breast phantom and an ex vivo human prostate. We evaluated the PSFs from the simulations and needle hydrophone scans and found good agreement. We quantitatively analyzed the grating lobe levels of the PSFs for the different configurations. We compared images generated using different configurations of the subapertures in the urethane breast phantom and ex vivo human prostate. The advantage of the 1.75D array transducer is the multiple rows of elements that can be used for improving elevation focus for imaging formation. VA imaging using a 1.75D array transducer provides improved image detail and contrast due to better elevation focusing of the imaging PSF.
AB - Vibro-acoustography (VA) is an ultrasound-based imaging modality that uses radiation force produced by two confocal ultrasound beams separated by small frequency difference, Δf, to vibrate tissue at Δf. We used a 1.75D transducer with 12 rows and 70 columns of elements with size 0.9 x 0.9 mm. The point-spread functions (PSFs) for different configurations of the subapertures for the two frequencies centered about 5 MHz were evaluated using a numerical simulation model using Field II. Experimentally, we scanned the pressure field for different configurations using a needle hydrophone to evaluate the PSF. Finally, we scanned a urethane breast phantom and an ex vivo human prostate. We evaluated the PSFs from the simulations and needle hydrophone scans and found good agreement. We quantitatively analyzed the grating lobe levels of the PSFs for the different configurations. We compared images generated using different configurations of the subapertures in the urethane breast phantom and ex vivo human prostate. The advantage of the 1.75D array transducer is the multiple rows of elements that can be used for improving elevation focus for imaging formation. VA imaging using a 1.75D array transducer provides improved image detail and contrast due to better elevation focusing of the imaging PSF.
KW - 1.75D array
KW - beamforming
KW - vibro-acoustography
UR - http://www.scopus.com/inward/record.url?scp=84869041944&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84869041944&partnerID=8YFLogxK
U2 - 10.1109/ULTSYM.2011.0163
DO - 10.1109/ULTSYM.2011.0163
M3 - Conference contribution
AN - SCOPUS:84869041944
SN - 9781457712531
SP - 672
EP - 675
BT - IEEE International Ultrasonics Symposium, IUS
ER -