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Model nonlinear effect in ultrasound fields
Kulík, Tomáš ; Čech, Petr (referee) ; Rozman, Jiří (advisor)
The main topic of this diploma thesis is the modeling of nonlinear effects in ultrasonic fields. The work deals with application of finite difference method (FDTD) on the Westervelt equation and the subsequent creation of the model of ultrasonic fields in MATLAB. This thesis also includes theoretical analysis of ultra-acoustic and technical aspects of diagnostic ultrasonography. In addition, this document includes verification of theoretical assumptions by using created model.
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Incidence of microtrauma in the Achilles tendon compared in athletic runners and swimmers using diagnostic ultrasonography
Novotný, Aleš ; Routner, Petr (advisor) ; Katolický, Jakub (referee)
9 ABSTRACT INTRODUCTION: The Achilles tendon is the tendon with the most volume in the human body. It is capable of handling enormous loads, though it can be damaged with overuse. Overloading the Achilles tendon can lead to microtrauma, which can cause the development of Achilles tendinopathy. Diagnostic ultrasonography is used to investigate the incidence of microtrauma of the Achilles Tendon in runners and swimmers and whether there is any kind of correlation between their occurrence and training intensity. OBJECTIVE: This study aims to determine the presence of microtrauma in the Achilles tendon in a group of runners and swimmers using diagnostic ultrasonography. In addition to the observation of microtrauma, this study focuses on finding other Achilles tendon pathologies from overuse in runners and swimmers. This study seeks to increase awareness of the potential of using diagnostic ultrasonography in physiotherapy practice. METHODS: A total of 20 subjects (13 women and 7 men, mean age 22.6 ± 1.16 years) participated in this study. The subjects were divided into two groups of 10 swimmers and 10 runners each. Data collection was carried out at a private outpatient clinic at ALAFIA- RHB s.r.o. located in Parník Policlinic in Černý Most, Prague. The methodology for obtaining the personal data and sports...
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Effect of Functional Electrical Stimulation-Assisted Ergometry on Muscle Cross-Sectional Diameter, Nitrogen and Fluid Balance in Critically Ill
Hejnová, Marie ; Řasová, Kamila (advisor) ; Neuwirthová, Svatava (referee)
Author: Bc. Marie Hejnová Title: Effect of Functional Electrical Stimulation-Assisted Ergometry on Muscle Cross-Sectional Diameter, Nitrogen and Fluid Balance in Critically Ill Objectives: The aim of this thesis was to investigate the effect of functional electrical stimulation-assisted cycling ergometry (FES-CE) on cross-sectional diameter of the quadriceps femoris (QF) muscle of both lower extremities in critically ill patients. Another objective was to evaluate if the measured values are responding to the changes in muscle tissue or are caused by an oedema. Methods: The intervention group received daily intensified physical therapy and FES-CE. We measured cross-sectional diameter of the QF muscle repeatedly by a diagnostic ultrasound. We recorded daily nitrogen balance to objectivize catabolism of muscle and fluid balance to objectivize amount of cumulative fluid. Results: The total of 115 patients were evaluated. Average decrease of cross-sectional diameter of QF muscle in the intervention group was 0.020 ± 0.070 cm/day, in the control group it was 0.017 ± 0.084 cm/day (p = 0.87). We registered an opposite result from the eighth day onwards, the intervention group had average decrease 0.025 ± 0.047 cm/day and the control group 0.040 ± 0.076 cm/day (p = 0.38). The nitrogen intake was...
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Model nonlinear effect in ultrasound fields
Kulík, Tomáš ; Čech, Petr (referee) ; Rozman, Jiří (advisor)
The main topic of this diploma thesis is the modeling of nonlinear effects in ultrasonic fields. The work deals with application of finite difference method (FDTD) on the Westervelt equation and the subsequent creation of the model of ultrasonic fields in MATLAB. This thesis also includes theoretical analysis of ultra-acoustic and technical aspects of diagnostic ultrasonography. In addition, this document includes verification of theoretical assumptions by using created model.
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