Journal article · Ahead of Print article
Curvilinear 3-D Imaging Using Row–Column Addressed 2-D Arrays with a Diverging Lens: Phantom Study
Department of Electrical Engineering, Technical University of Denmark1
Biomedical Engineering, Department of Electrical Engineering, Technical University of Denmark2
Department of Micro- and Nanotechnology, Technical University of Denmark3
MEMS-AppliedSensors, Department of Micro- and Nanotechnology, Technical University of Denmark4
Sound Technology, Inc.5
BK Medical ApS6
Center for Fast Ultrasound Imaging, Centers, Technical University of Denmark7
A double-curved diverging lens over the flat row– column-addressed (RCA) 2-D array can extend its inherent rectilinear 3-D imaging field-of-view (FOV) to a curvilinear volume region, which is necessary for applications such as abdominal and cardiac imaging. Two concave lenses with radii of 12.7mm and 25.4mm were manufactured using RTV664 silicone.
The diverging properties of the lenses were evaluated based on simulations and measurements on several phantoms. The measured FOV for both lenses in contact with tissue mimicking phantom were less than 15% different from the theoretical predictions, i.e., a curvilinear FOV of 32°×32° and 24°×24° for the 12.7mm and 25.4mm radii lenses.
A synthetic aperture imaging sequence with single element transmissions was designed for imaging down to 140mm at a volume rate of 88 Hz. The performance was evaluated in terms of signal-to-noise ratio (SNR), FOV, and full-width-at-half-maximum (FWHM) of a focused beam. The penetration depths in a tissue mimicking phantom with 0.5 dB/(cm MHz) attenuation were 100mm and 125mm for the lenses with radii of 12.7mm and 25.4 mm.
The azimuth, elevation, and radial FWHM at 43mm depth were (5.8, 5.8, 1)λ and (6, 6, 1)λ. The results of this study confirm that the proposed lens approach is an effective method for increasing the FOV, when imaging with RCA 2-D arrays.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2018 |
| Pages: | 1182-1192 |
| ISSN: | 15258955 and 08853010 |
| Types: | Journal article and Ahead of Print article |
| DOI: | 10.1109/TUFFC.2018.2836384 |
| ORCIDs: | Bouzari, Hamed , Engholm, Mathias , Stuart, Matthias Bo , Thomsen, Erik Vilain and Jensen, Jørgen Arendt |
3-D ultrasound imaging Acoustic arrays Acoustics Attenuation Equipment Design Frequency control Humans Imaging, Three-Dimensional Lenses Models, Biological Phantoms Phantoms, Imaging RCA 2D arrays RTV664 silicone Signal Processing, Computer-Assisted Ultrasonography abdominal imaging beamforming biological tissues biomedical ultrasonics cardiac imaging concave lenses curvilinear FOV curvilinear volume region diverging lens flat row-column frequency 88.0 Hz image resolution image sequences inherent rectilinear 3D imaging field lenses medical image processing row-column addressed 2-D arrays signal-to-noise ratio single-element transmissions size 100.0 mm size 12.7 mm size 125.0 mm size 140.0 mm size 25.4 mm synthetic aperture synthetic aperture imaging sequence tissue mimicking phantom ultrasonic imaging ultrasonic transducer arrays volume rate
