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Applicerbarhet av Scaled Reassigned Spectrogram for Transient Signals (ReSTS) på ultraljudssignaler från biologisk vävnad

Florentsson, Sara LU and Hollsten, Anna LU (2022) EEML05 20221
Department of Biomedical Engineering
Abstract
The possibility of being able to examine the inside of the human body is the foundation of today’s medical diagnostics. This can be done through different imaging systems, where ultrasound is one of the most important imaging methods used. Ultrasound does not endanger the patient during examination, unlike other imaging systems that use ionizing radiation or strong magnetic fields. In order to obtain good resolution images, a high frequency of the ultrasound waves is necessary. However, higher acoustic frequencies have a shorter penetration depth in the tissue compared to lower frequencies. Thereby, ultrasound has a difficulty in providing high resolution images from deep inside the tissues. By processing the signals from the ultrasound in... (More)
The possibility of being able to examine the inside of the human body is the foundation of today’s medical diagnostics. This can be done through different imaging systems, where ultrasound is one of the most important imaging methods used. Ultrasound does not endanger the patient during examination, unlike other imaging systems that use ionizing radiation or strong magnetic fields. In order to obtain good resolution images, a high frequency of the ultrasound waves is necessary. However, higher acoustic frequencies have a shorter penetration depth in the tissue compared to lower frequencies. Thereby, ultrasound has a difficulty in providing high resolution images from deep inside the tissues. By processing the signals from the ultrasound in a different way, the resolution may be improved. Starkhammar et. al. have developed a new signal processing method to improve the resolution. Reassigned spectrogram for transient signals (ReSTS) uses the main signals from the echoes in order to separate partially overlaying echoes from each other. An improved resolution has been confirmed in images of phantoms, but not yet in biological tissues, which this study will examine. A method to test this was designed through an iterative process. The result from this was a method using pork as the biological tissue, with a thread of nylon placed inside the meat on a depth of 25 millimeters. The measurements, where the ReSTS was applied on images generated with the center frequencies around 5 MHz and 9.5 MHz, showed an improved resolution. The project was performed at the Biomedical Institute, Lunds Tekniska Högskola. (Less)
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author
Florentsson, Sara LU and Hollsten, Anna LU
supervisor
organization
alternative title
Application of Scaled Reassigned Spectrogram for Transient Signals (ReSTS) on medical ultrasound data of biological tissue
course
EEML05 20221
year
type
M2 - Bachelor Degree
subject
keywords
Ultrasound, resolution, biological tissue, signal processing
language
Swedish
id
9093704
date added to LUP
2022-06-30 13:20:24
date last changed
2022-06-30 13:20:24
@misc{9093704,
  abstract     = {{The possibility of being able to examine the inside of the human body is the foundation of today’s medical diagnostics. This can be done through different imaging systems, where ultrasound is one of the most important imaging methods used. Ultrasound does not endanger the patient during examination, unlike other imaging systems that use ionizing radiation or strong magnetic fields. In order to obtain good resolution images, a high frequency of the ultrasound waves is necessary. However, higher acoustic frequencies have a shorter penetration depth in the tissue compared to lower frequencies. Thereby, ultrasound has a difficulty in providing high resolution images from deep inside the tissues. By processing the signals from the ultrasound in a different way, the resolution may be improved. Starkhammar et. al. have developed a new signal processing method to improve the resolution. Reassigned spectrogram for transient signals (ReSTS) uses the main signals from the echoes in order to separate partially overlaying echoes from each other. An improved resolution has been confirmed in images of phantoms, but not yet in biological tissues, which this study will examine. A method to test this was designed through an iterative process. The result from this was a method using pork as the biological tissue, with a thread of nylon placed inside the meat on a depth of 25 millimeters. The measurements, where the ReSTS was applied on images generated with the center frequencies around 5 MHz and 9.5 MHz, showed an improved resolution. The project was performed at the Biomedical Institute, Lunds Tekniska Högskola.}},
  author       = {{Florentsson, Sara and Hollsten, Anna}},
  language     = {{swe}},
  note         = {{Student Paper}},
  title        = {{Applicerbarhet av Scaled Reassigned Spectrogram for Transient Signals (ReSTS) på ultraljudssignaler från biologisk vävnad}},
  year         = {{2022}},
}