Delta-sigma subarray beamforming for ultrasound imaging

Hasan Şakir BİLGE

Makale detayları

Delta-sigma subarray beamforming for ultrasound imaging

Yazarlar:

Hasan Şakir BİLGE

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Electrical Engineering and Computer Science 2010 Vol.18 Issue 6, pp.1003-1018

Belge Tipi:

Makale

Yayın Tarihi:

5/2010

Belge Dili:

Türkçe

Document ID (Org No.):

2000743846

Sıklık:

İki Aylık

eISSN:

1303-6203

pISSN:

1300-0632

Özet:

 

In this study, an ultrasonic digital beamformer based on  subarray processing of 1-bit delta-sigma (D S ) oversampled  echo signals is presented.  The single-bit oversampling D S  conversion simplifies the coherent processing in beamforming with  improved timing accuracy.  Subarray processing also aims to simplify  the beamforming complexity, where the partial-beam sums  (low-resolution beams) are acquired from small subarrays, and then  these partial beams are coherently processed for producing  high-resolution beams.  In the D S subarray beamforming, the  D S coded echo signals are summed over the subarray  channels, and then these partial beam-sums are first D S  demodulated, then processed for beam-interpolation, followed by  coherent summation.  This method requires decimation filtering of  partial-beam sums from each subarray.  The hardware complexity of the  D S subarray beamformer is compared with other beamformers  and significant front-end savings are explained.  The system is tested  experimentally and the results are compared with others using B-scan  images reconstructed from archival experimental raw RF data.  Both  wire targets and cyst phantom are used to show the differences in  Signal to Noise Ratio (SNR) and Contrast to Noise Ratio (CNR)  measurements.

 

In this study, an ultrasonic digital beamformer based on  subarray processing of 1-bit delta-sigma (D S ) oversampled  echo signals is presented.  The single-bit oversampling D S  conversion simplifies the coherent processing in beamforming with  improved timing accuracy.  Subarray processing also aims to simplify  the beamforming complexity, where the partial-beam sums  (low-resolution beams) are acquired from small subarrays, and then  these partial beams are coherently processed for producing  high-resolution beams.  In the D S subarray beamforming, the  D S coded echo signals are summed over the subarray  channels, and then these partial beam-sums are first D S  demodulated, then processed for beam-interpolation, followed by  coherent summation.  This method requires decimation filtering of  partial-beam sums from each subarray.  The hardware complexity of the  D S subarray beamformer is compared with other beamformers  and significant front-end savings are explained.  The system is tested  experimentally and the results are compared with others using B-scan  images reconstructed from archival experimental raw RF data.  Both  wire targets and cyst phantom are used to show the differences in  Signal to Noise Ratio (SNR) and Contrast to Noise Ratio (CNR)  measurements.

Makale detayları

Delta-sigma subarray beamforming for ultrasound imaging

Yazarlar: Hasan Şakir BİLGE

Yayıncı: TUBITAK

Dergi: Turkish Journal of Electrical Engineering and Computer Science 2010 Vol.18 Issue 6, pp.1003-1018

Belge Tipi: Makale

Yayın Tarihi: 5/2010

Belge Dili: Türkçe

Document ID (Org No.): 2000743846

Sıklık: İki Aylık

eISSN: 1303-6203

pISSN: 1300-0632

Sayı

Yazarlar:

Hasan Şakir BİLGE

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Electrical Engineering and Computer Science 2010 Vol.18 Issue 6, pp.1003-1018

Belge Tipi:

Makale

Yayın Tarihi:

5/2010

Belge Dili:

Türkçe

Document ID (Org No.):

2000743846

Sıklık:

İki Aylık

eISSN:

1303-6203

pISSN:

1300-0632