Experimental evaluation of noise generated by grating lobes for a sparse 3D ultrasound computer tomography system

2013 ◽  
Author(s):  
Nicole V. Ruiter ◽  
Michael Zapf ◽  
Torsten Hopp ◽  
Hartmut Gemmeke
Keyword(s):  
Computer Tomography ◽  
Experimental Evaluation ◽  
3D Ultrasound ◽  
Tomography System

Prototype of a new 3D ultrasound computer tomography system: transducer design and data recording

2004 ◽  
Author(s):  
Rainer Stotzka ◽  
Helmut Widmann ◽  
Tim O. Mueller ◽  
Klaus Schlote-Holubek ◽  
Hartmut Gemmeke ◽  
...  
Keyword(s):  
Computer Tomography ◽  
3D Ultrasound ◽  
Data Recording ◽  
Tomography System ◽  
Transducer Design

Optimization of the aperture and the transducer characteristics of a 3D ultrasound computer tomography system

2014 ◽  
Author(s):  
Nicole V. Ruiter ◽  
Michael Zapf ◽  
Torsten Hopp ◽  
Robin Dapp ◽  
Hartmut Gemmeke
Keyword(s):  
Computer Tomography ◽  
3D Ultrasound ◽  
Tomography System

Semi-Automated Packaging of Transducer Arrays for 3D Ultrasound Computer Tomography

2020 ◽  
Author(s):  
Martin Angerer ◽  
Michael Zapf ◽  
Benjamin Leyrer ◽  
Nicole V. Ruiter
Keyword(s):  
Computer Tomography ◽  
3D Ultrasound ◽  
Transducer Arrays

Transverse images of the human thoracic trachea during forced expiration

1989 ◽  
Vol 67 (3) ◽  
pp. 1032-1040 ◽  
Author(s):  
M. Thiriet ◽  
J. M. Maarek ◽  
D. A. Chartrand ◽  
C. Delpuech ◽  
L. Davis ◽  
...  
Keyword(s):  
Wave Velocity ◽  
Flow Rate ◽  
Computer Tomography ◽  
Contact Area ◽  
Forced Expiration ◽  
Air Velocity ◽  
Initial Value ◽  
Tomography System ◽  
Local Wave ◽  
Lateral Walls

The thoracic trachea and the proximal portion of the major bronchi were imaged in five normal volunteers during a forced expiration maneuver using a cine-computer-tomography system. Sixteen images of two contiguous slices were obtained in less than 1 is while expiratory flow was recorded at the mouth. The area of the thoracic trachea decreased rapidly as flow rate rose to its maximum and the wave of collapse propagated distally. The compressive narrowing of both the pars membranacea and the ventrolateral wall was asymmetric. A contact area appeared between the posterior and the left lateral walls. In one subject the trachea was imaged during the entire maneuver with a lower scan frequency. By 725 ms after the beginning of the forced expiration, the area had first decreased to 15% of its initial value and then reincreased to 46% of its initial value. It stayed constant for the remainder of the maneuver. The measured maximum air velocity was greater than the estimated local wave velocity.

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