The Study of Sound Scattering Structures for the Purposes οf Room Acoustic Enhancement

Ultrasound is used for breast cancer detection as a technique complementary to mammography, the standard screening method. Current practice is based on reflectivity images obtained with conventional instruments by an operator who positions the ultrasonic transducer by hand over the patient's body. It is a non-ionizing radiation, pain-free and not expensive technique that provides a higher contrast than mammography to discriminate among fluid-filled cysts and solid masses, especially for dense breast tissue. However, results are quite dependent on the operator's skills, images are difficult to reproduce, and state-of-the-art instruments have a limited resolution and contrast to show micro-calcifications and to discriminate between lesions and the surrounding tissue. In spite of their advantages, these factors have precluded the use of ultrasound for screening.This work approaches the ultrasound-based early detection of breast cancer with a different concept. A ring array with many elements to cover 360• around a hanging breast allows obtaining repeatable and operator-independent coronal slice images. Such an arrangement is well suited for multi-modal imaging that includes reflectivity, compounded, tomography, and phase coherence images for increased specificity in breast cancer detection. Preliminary work carried out with a mechanical emulation of the ring array and a standard breast phantom shows a high resolution and contrast, with an artifact-free capability provided by phase coherence processing.

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“…7 and 8) thanks to which the sound wave incident onto the wall will be diffused uniformly in all directions (Kamisiński et al, 2010a). In Fig.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Multimodal Ultrasonic Imaging for Breast Cancer Detection

Camacho

Medina

Cruza

et al. 2012

Archives of Acoustics

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“…6). The studied sample can be placed on the turntable, while the sound source and measuring microphones are positioned manually (Kamisiński et al, 2010). A prototype system described here is in operation at the Department of Mechanics and Vibroacoustics.…”

Section: A New Concept Of Microphone Positioning In the Anechoic Chambermentioning

confidence: 99%

Testing of a Device for Positioning Measuring Microphones in Anechoic and Reverberation Chambers

Felis¹,

Flach²,

Kamisiński³

2012

Archives of Acoustics

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This paper presents a mechanical positioning system for a measuring microphone designed for acoustic studies in anechoic and reverberation chambers at the Department of Mechanics and Vibroacoustics, AGH. The results are discussed in the context of mechanical positioning and its impact on the outcome of the execution of individual measurement procedures. Moreover, areas for research were identified and solution concepts shown for further development of the automation of acoustic measurements in different research rooms in order to reduce the human involvement in them.

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“…In order to reduce diffraction at the edges and scattering generated by the base plate, the space under the table was separated from the space of the reverberation chamber. The diameter of the sample was 2.75 m. The outer edge of the sample, like that of the table, was secured with a rigid band along the full height (Kamisiński et al, 2010).…”

Section: Testing Proceduresmentioning

confidence: 99%

Test Signal Selection for Determining the Sound Scattering Coefficient in a Reverberation Chamber

Kamisiński¹,

Brawata²,

Pilch³

et al. 2012

Archives of Acoustics

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The paper focuses on the problem of test signal selection in determining the sound scattering coefficient in accordance with ISO 17497-1. Research shows that the use of MLS signal is preferred in this procedure. The sine sweep signal, despite its advantages, presents certain limitations if the sample is moving during measurement. An attempt has been made to develop a method that allows for minimization of error, demonstrating the dependence of the obtained values of the sound scattering coefficient on the rotational speed of the turntable and type of test signal. Conditions for the application of the sine sweep signals in continuous and discrete measurements were defined.

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The Study of Sound Scattering Structures for the Purposes οf Room Acoustic Enhancement

Cited by 15 publications

References 1 publication

Multimodal Ultrasonic Imaging for Breast Cancer Detection

Multimodal Ultrasonic Imaging for Breast Cancer Detection

Testing of a Device for Positioning Measuring Microphones in Anechoic and Reverberation Chambers

Test Signal Selection for Determining the Sound Scattering Coefficient in a Reverberation Chamber

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