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Poster SessionPoster
Ultrasound Computed Tomography (USCT) has great potential for 3D quantitative imaging of acoustic breast tissue properties. Typical devices include high-frequency transducers, which makes tomography techniques based on numerical wave propagation simulations computationally challenging, especially in 3D. Therefore, despite the finite-frequency nature of ultrasonic waves, ray-theoretical...
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Poster SessionPoster
Background：
Ultrasound Computed Tomography (USCT) is a promising medical imaging tool, which reconstructs the images of the object using both reflected and transmitted ultrasound signals. Attenuation tomography of USCT has been studied by many researchers since its great clinical potential of early breast cancer detection.Material and Method：
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The Lucid USCT system developed in... -
Poster SessionPoster
Photoacoustic tomography (PAT) is a noninvasive, high-resolution imaging modality, capable of providing functional and molecular information of various pathologies such as cancer. In PAT imaging one optical limitation is the attenuation effect depth has on fluence and therefore the generation of PA signals from deeper regions of tissue. This makes it impossible to equally compare signals from...
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Purpose
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Transcranial Sonography (TCS) is a non-invasive diagnostic tool for evaluation of cerebral arteries and brain parenchyma. Besides having non-uniform resolution and inferior visual appearance, TCS works only in persons with sufficient trans-temporal acoustic bone window, which limits the diagnostic potential and prevents accurate imaging of the entire brain.
Compared to TCS,... -
Poster SessionPoster
Acoustic sound speed is an important bio-marker that can be used to characterize tissue types in the breast and differentiate between them.
The conventional way to obtain sound speed image is by using tomographic imaging methods. Higher resolution imaging uses non linear methods that range from ray-based travel time tomography to full-waveform inversion (FWI). Although the complexity varies,...
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Poster SessionPoster
In our 3D Ultrasound Computer Tomography system (USCT), the 12 bit ADC and factor 10 VGA are insufficient to resolve the smallest interesting signals. An adaptive front-end gain can solve this by object specific adaptions during the measurement.
The 3D USCT II of the KIT device contains 157 Transmitter Array System (TAS). Each TAS has 13 piezoelectric transducers, corresponding analog signal...
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Poster SessionPoster
The KIT’s 3D Ultrasound Computer Tomography (USCT) II system has a multistatic setup of 2041 ultrasound transducers with approx. 1.5 MHz 6dB bandwidth and 36° 3 dB opening angle for 2.5 MHz. To increase the region of interest for a next USCT generation, the opening angle should be increased to approx. 60° and the bandwidth doubled..
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To increase the opening angle the size of the transducer... -
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Poster SessionPoster
Background:
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Pseudo-linear-frequency-modulation pulses (pseudochirps) is widely applied as transmitted signals in conventional ultrasound imaging system because of the low cost of the signal generation hardware and better depth of penetration. The spectrum of the pseudoshirps can be modified for better matching to the transducer. Echo signals of pseudochirps after pulse compression may last... -
MethodsOral
High-resolution ultrasonic imaging has been increasingly used in dermatology as a complementary technique for cutaneous lesions assessment. It may reduce the number of invasive procedures such as biopsies and assist in surgery planning. The success of ultrasonic methods highly relies on the ability of modern imaging systems to deliver precise and interpretable information. The new portable...
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Poster SessionPoster
Ultrasound computed tomography (USCT) is frequently used for medical purposes to image soft tissue body parts, as for instance the breast.
Breast cancer detection using USCT usually works with a collection of ultrasound scans that measure the pressure wavefield emitted by individual transducers. This often requires a large number of emitter-receiver pairs to obtain a good coverage of the...
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Poster SessionPoster
The computational complexity of wave-based image reconstructions is very high. For this reason, approximations for 3D are required. Here, ray-based approaches are commonly used. The straight ray approximation neglects physical effects like refraction. Bent ray approaches like the widely used fast marching method may include this effect yet are still computationally demanding, especially in 3D....
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3D Ultrasound Computer Tomography (3D USCT) is an imaging method for the early detection of breast cancer. It provides three-dimensional multimodal images of the breast. The 3D USCT device developed at Karlsruhe Institute of Technology contains more than two thousand ultrasound transducers placed in a water-filled semi-ellipsoidal reservoir where the patient submerges one breast. The...
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MethodsOral
Background
Full-waveform inversion (FWI), a technique developed in geophysics, has recently been applied to produce high-resolution and quantitative reconstructions in the context of medical ultrasound imaging. However, even though FWI has shown great promise, realistic acquisition conditions introduce a series of uncertainties that cannot be fully considered using existing schemes. This...
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