Detectability of small blood vessels and flat boundaries of soft tissues in the ultrasonic pulse echo method
The detectability of a small blood vessel of a radius 0.1 mm by the pulse echo ultrasonic method using a frequency of 2.5 MHz was estimated. It was assumed that the vessel was surrounded by a homogeneous soft tissue (i.e. causing no reflection) and was in the near region of the far field radiated in...
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| Language: | English |
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Institute of Fundamental Technological Research Polish Academy of Sciences
2016-03-01
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| Series: | Archives of Acoustics |
| Online Access: | https://acoustics.ippt.pan.pl/index.php/aa/article/view/3293 |
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| author | L. FILIPCZYŃSKI |
| author_facet | L. FILIPCZYŃSKI |
| author_sort | L. FILIPCZYŃSKI |
| collection | DOAJ |
| description | The detectability of a small blood vessel of a radius 0.1 mm by the pulse echo ultrasonic method using a frequency of 2.5 MHz was estimated. It was assumed that the vessel was surrounded by a homogeneous soft tissue (i.e. causing no reflection) and was in the near region of the far field radiated in a continuous manner by a plane transducer of a diameter of 2 cm. The soft tissue and the walls of the vessel were assumed to have the same elastic properties as those of a liquid.
The measurements were carried out in a plane polar coordinate system, where the incident wave, the reflected wave and the wave penetrating into the vessel were expressed in terms of Bessel and HankeI functions. The boundary conditions were assumed in the form of the equality of the acoustic pressures and the normal components of acoustic velocitits on each side of the surface of the vessel. Thence the magnitude of the reflected wave was determined.
The losses of the signal due to the reflection of the wave, its divergence and absorption, are shown in the form of a graph from which it can be seen that the signal from the vessel considered is essentially detectible, although it lies near the noise level, and is critically dependent on the distance from the transducer due to attenuation in the tissues penetrated.
The detectability of the plane boundaries of soft tissues was also determined, indicating that at a distance of 20 cm from the transducer a difference in the characteristic acoustic impedance of the tissues of 0.2% is sufficient to give a detectable echo. |
| format | Article |
| id | doaj-art-79bbb5147b64432ca5ada69a2be46f3a |
| institution | Kabale University |
| issn | 0137-5075 2300-262X |
| language | English |
| publishDate | 2016-03-01 |
| publisher | Institute of Fundamental Technological Research Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Acoustics |
| spelling | doaj-art-79bbb5147b64432ca5ada69a2be46f3a2025-08-20T03:50:44ZengInstitute of Fundamental Technological Research Polish Academy of SciencesArchives of Acoustics0137-50752300-262X2016-03-0161Detectability of small blood vessels and flat boundaries of soft tissues in the ultrasonic pulse echo methodL. FILIPCZYŃSKI0Institute of Fundamental Technological Research Polish Academy of SciencesThe detectability of a small blood vessel of a radius 0.1 mm by the pulse echo ultrasonic method using a frequency of 2.5 MHz was estimated. It was assumed that the vessel was surrounded by a homogeneous soft tissue (i.e. causing no reflection) and was in the near region of the far field radiated in a continuous manner by a plane transducer of a diameter of 2 cm. The soft tissue and the walls of the vessel were assumed to have the same elastic properties as those of a liquid. The measurements were carried out in a plane polar coordinate system, where the incident wave, the reflected wave and the wave penetrating into the vessel were expressed in terms of Bessel and HankeI functions. The boundary conditions were assumed in the form of the equality of the acoustic pressures and the normal components of acoustic velocitits on each side of the surface of the vessel. Thence the magnitude of the reflected wave was determined. The losses of the signal due to the reflection of the wave, its divergence and absorption, are shown in the form of a graph from which it can be seen that the signal from the vessel considered is essentially detectible, although it lies near the noise level, and is critically dependent on the distance from the transducer due to attenuation in the tissues penetrated. The detectability of the plane boundaries of soft tissues was also determined, indicating that at a distance of 20 cm from the transducer a difference in the characteristic acoustic impedance of the tissues of 0.2% is sufficient to give a detectable echo.https://acoustics.ippt.pan.pl/index.php/aa/article/view/3293 |
| spellingShingle | L. FILIPCZYŃSKI Detectability of small blood vessels and flat boundaries of soft tissues in the ultrasonic pulse echo method Archives of Acoustics |
| title | Detectability of small blood vessels and flat boundaries of soft tissues in the ultrasonic pulse echo method |
| title_full | Detectability of small blood vessels and flat boundaries of soft tissues in the ultrasonic pulse echo method |
| title_fullStr | Detectability of small blood vessels and flat boundaries of soft tissues in the ultrasonic pulse echo method |
| title_full_unstemmed | Detectability of small blood vessels and flat boundaries of soft tissues in the ultrasonic pulse echo method |
| title_short | Detectability of small blood vessels and flat boundaries of soft tissues in the ultrasonic pulse echo method |
| title_sort | detectability of small blood vessels and flat boundaries of soft tissues in the ultrasonic pulse echo method |
| url | https://acoustics.ippt.pan.pl/index.php/aa/article/view/3293 |
| work_keys_str_mv | AT lfilipczynski detectabilityofsmallbloodvesselsandflatboundariesofsofttissuesintheultrasonicpulseechomethod |