Co-array optimization of CMUT arrays for forward-looking IVUS
Yükleniyor...
Dosyalar
Tarih
2009-09
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
IEEE
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Attribution-NonCommercial-NoDerivs 3.0 United States
Attribution-NonCommercial-NoDerivs 3.0 United States
Özet
The ring annular array structure is a preferred configuration for implementing Forward-Looking IVUS (FLIVUS) catheters as it allows for volumetric imaging as well as use of a guidewire at the center. CMUT technology is promising for these arrays especially with the flexibility of locating array elements on the circular donut area efficiently. To take advantage of this flexibility, in this study, we introduce a new co-array sampling strategy that improves imaging performance while keeping the number of firings at a level suitable for real-time imaging. The presented co-array sampling strategy is based on the idea of adjusting the element density of the co-array rings in radial direction to suppress side lobes. In non-uniform sampling of the co-array with a given number of firings, the inter-element distances are adjusted both in radial and angular direction from inner ring to outer ring to fit a given apodization function. To test the imaging performance, we performed numerical simulations of the co-array with non-uniform sampling fitting to the raised-cosine apodization. The simulation results shows that sidelobe level can be reduced more than 10 dB by using non-uniform co-array sampling. This approach does use uniform weighting of all Tx and Rx elements in beamforming, and hence does not cause any SNR loss for apodization.
Açıklama
Anahtar Kelimeler
Acoustic signal processing, Apertures, Apodization function, Array signal processing, Bandwidth, Biomedical ultrasonics, Capacitive micromachined ultrasonic transducers, Catheters, CMUT, CMUT arrays, Co-array, Coarray optimization, Coarray ring element density, Coarray sampling strategy, Fabrication, FL-IVUS catheters, Forward looking, Forward looking IVUS catheters, Forward-looking, Guidewire, Imaging performance, Integrated circuit technology, Intravascular ultrasound, Medical image processing, Nonuniform sampling, Piezoelectric transducers, Raised cosine apodisation, Ring annular array structure, Sampling methods, Sampling strategies, Solid state circuits, Ultrasonic imaging, Ultrasonic transducer arrays, Volumetric imaging
Kaynak
IEEE International Ultrasonics Symposium
WoS Q Değeri
Scopus Q Değeri
Cilt
Sayı
Künye
Tekeş, C., Karaman, M. & Değertekin, F. L. (2009). Co-array optimization of CMUT arrays for forward-looking IVUS, Paper presented at the IEEE International Ultrasonics Symposium, 1326-1329. doi:10.1109/ULTSYM.2009.5441519
