International Workshop on Medical Ultrasound Tomography

Session

Poster session

Nov 2, 2017, 3:00 PM

39. Comparison of registration strategies for USCT-MRI image fusion: preliminary results

11/2/17, 3:00 PM

Main Track

Poster

Comparing USCT to well-known MRI is an essential step to evaluate the clinical value of USCT. Yet the different conditions of the breast either embedded in water (USCT) or in air (MRI) prevent direct comparison of tissue structures due to non-linear deformations of the breast in 3D. Previously we presented an image registration simulating the MRI subjected to buoyancy. In this work we compare...

60. Comparison of two ray tracing methods for sound speed imaging

11/2/17, 3:00 PM

Main Track

Poster

Sound speed imaging in USCT is a kind of functional imaging mode which can provide valuable information for differentiating normal tissue and tumor. Sound speed imaging in USCT is a kind of functional imaging mode which can provide valuable information for differentiating normal tissue and tumor. One of the key problems of sound speed reconstruction is ray tracing. This paper compares the...

38. Contrast resolution enhancement of Ultrasonic Computed Tomography (USCT) using a wavelet-based method – Preliminary results in bone imaging

11/2/17, 3:00 PM

Main Track

Poster

In the case of bone imaging, current medical echography does not allow imaging under the cortical zone; no information is available on cortical depth, underlying medullary tissue or marrow. Many authors have discussed ultrasonic imaging of bones. Their main objective was to evaluate the thickness of the diaphysis in axial and transverse mode, and to estimate the velocity of the sound of a...

23. Fast reflectivity imaging in 3D using SAFT

11/2/17, 3:00 PM

Main Track

Poster

The computational burden for 3D Synthetic Aperture Focusing Technique (SAFT) is large as for each voxel the delay for each acquired A-scan has to be calculated, e.g. O(N$^5$) for N$^3$ voxels and N$^2$ A-scans. If the 3D distribution of speed of sound is applied to correct the delays for objects with varying speed of sound the computation time increases further. This overview paper presents...

56. Improved temperature measurement and modeling for 3D USCT II

11/2/17, 3:00 PM

Main Track

Poster

Ultrasound computer tomography for breast cancer relies on accurate SOS information, mostly disturbed by the temperature dependency of H$^2$O as medium. The current KIT USCT system (3D USCT II) incorporates many temperature sensors: two accurate calibrated and many low accuracy temp. sensors for spatially densely sampled 3d information. The accurate knowledge of the temperature is important...

55. Measurement of the speed of sound, attenuation and mass density of fresh breast tissue

11/2/17, 3:00 PM

Main Track

Poster

An improved distinction between benign and malignant lesions is necessary to enhance the diagnostic value of breast ultrasonography. This requires a better quantitative characterization of tissues and hence accurate knowledge about the acoustic medium parameters. Current data on these parameters is inconsistent due to variations in applied measurement protocols. We tested a standardized...

44. Minimum-variance beamforming for ultrasound computer tomography imaging

11/2/17, 3:00 PM

Main Track

Poster

The breast cancer has become the most common type of cancer among women throughout the world.The traditional delay-and-sum (DAS) beamforming has been widely used in USCT imaging. In this paper, minimum-variance (MV) beamforming method is applied to improve the image quality for USCT. The USCT image is expected to have less noises and artifacts, and higher resolution and contrast.

35. Object Classification and Localization with an Airborne Ultrasound Imaging System

11/2/17, 3:00 PM

Main Track

Poster

An airborne ultrasound imaging system (ABUS) was developed at KIT for reflection tomography. The prototype system consists of sixteen ultrasonic transducers surrounding a region of interest (ROI) of defined shape with a diameter of 50 cm. The transducers have a center frequency of 200 kHz and a bandwidth of 20 kHz. The prototype aims to demonstrate possible industrial applications for object...

57. Piezofibre composite transducers for next generation 3D USCT

11/2/17, 3:00 PM

Main Track

Poster

At KIT a 3D USCT is under development. The system is optimized for SAFT imaging and has a multistatic setup of 2041 transducers with approx. 1MHz 3dB bandwidth and 36° 3dB opening angle for 2.5MHz. The USCT groups transducers in a semi-elliposoidal aperture surrounding a ROI of 10x10x10cm$^3$. To increase the ROI for a next USCT generation, the opening angle of a future transducer design...

22. The USCT reference data base

11/2/17, 3:00 PM

Main Track

Poster

Ultrasound Computer Tomography (USCT) is an emerging technology mostly aimed at breast cancer imaging. Following the idea of open science a USCT reference data base (http://ipeusctdb1.ipe.kit.edu/~usct/challenge/) is established with open and easy to use data and code interfaces. The aim is to promote and facilitate the exchange of available reconstruction algorithms and raw data sets from...

50. Visualisation of Ultrasound Computer Tomography Breast Data Set

11/2/17, 3:00 PM

Main Track

Poster

Visualising volume images is a key factor in diagnosing and detecting early breast cancer. However, the standard visualisation approaches still revolve around 2D images slides. Although 3D visualisation is important in diagnosing and treating breast cancer, yet the potential is not entirely realized with slices based visualisation. In this paper, we present an interactive 3D web-based...