The following white papers are available for download. Requires the free
Adobe Acrobat
Reader.
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| Multi-Frequency
Harmonic Arrays (MFHA)
A novel technique
to produce a three-octave broadband array for diagnostic ultrasound imaging,
particularly enhancing harmonic and sub-harmonic tissue imaging utilizing
contrast agents. A single MFHA probe would be amenable for several
diagnostic studies: adult and pediatric abdominal, breast, peripheral
vascular, small parts, musculoskeletal, and cardiac (sub-sternum). |
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| Harmonic
Spatial Control (HSC)
An extension
of tissue harmonic imaging to deep tissue depths, conceived to provide a
marked improvement in lateral resolution over conventional technology, while
maintaining a high dynamic range throughout the depth-of-field. |
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Multi-Modal Array (MMA)
[Description coming
soon]
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Lead-Free Piezoceramic Ultrasonic Transducers
This paper
presents the fabrication and characterization of lead free piezoelectric
KNNLT-LS (K0.44Na0.52Li0.04)(Nb0.84Ta0.10Sb0.06)O3 powders and ceramics. Due
to its moderate longitudinal piezoelectric charge coefficient (175 pC/N) and
kt of 0.50, the KNN-LT-LS composition may be a good candidate for high
frequency transducer applications.
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| Dermatological
Scanning Acoustic Microscope (DSAM)
In vivo imaging the micro-cellular structures of the
skin, including
epidermis, dermis and subcutaneous tissues, with a single array operating
over three octaves, from 25 to 200 MHz.
DSAM has the potential to provide early detection and classification
of cancer and environmentally induced diseases.
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| Scanning
Acoustic Microscope (SAM)
The development of a 3.2 GHz, 0.55 micron resolution, acoustic microscope
for in vivo imaging and characterization of micro-cellular biological
tissue structures. SAM may improve the visualization and clinical
assessment of consistent patterns of cellular malignancy,
with the greatest
promise for pathological and histological applications.
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| Synthetic
Structural Imaging (SSI)
A novel,
non-invasive, low frequency acoustic tissue measurement and imaging
technique that provides unique information concerning the size and shape of
biological structures and tumors, such as volume and composition. This would
represent an exciting advancement in the classification and visualization of
normal and abnormal biological tissue. The most significant clinical
benefits of SSI are therapeutic monitoring of tumor shrinkage with
chemo-radiation therapy/HIFU ablation, and obtaining estimates of total
fetal volume and the size of dense masses in breast tissue.
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| Porous Transducers
Porous ceramic
technology has the potential to provide the small area/weight footprint
usually associated with higher frequency transducers for low frequency
applications, such as elasticity imaging and therapeutic ultrasound.
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| Flexible
Transducer-Array
The processing, electromechanical and
acoustical properties of large-area flexible array of composite transducer
elements are presented. The array is made of several single composite
elements arranged in matrix form. The flexibility of the entire device
permits it to conform to the natural contours of the human body, and thus
has unique application in medical therapeutic ultrasound, such as
accelerating bone fracture healing.
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| Acoustic
Emission Monitoring (AEM)
The accompanying sudden, localized change of stress or
strain in bone tissue produces wideband acoustic emission (AE) signals that
may be uniquely related to the location and changes in bone mass, strength,
and architecture, referred to as bone quality. There may thus be a
strong correlation between the wideband AE signature and the spatially
localized micro-architecture characterizing different bone diseases.
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