Applicerbarhet av Scaled Reassigned Spectrogram for Transient Signals (ReSTS) på ultraljudssignaler från biologisk vävnad
(2022) EEML05 20221Department 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)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9093704
- 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
- 2022
- 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}}, }