Sökning: "Noise suppression"
Visar resultat 1 - 5 av 47 uppsatser innehållade orden Noise suppression.
1. Speckle suppression in ultrasound images of heterogeneous materials
Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för system- och rymdteknikSammanfattning : Performing non-destructive testing (NDT) on materials is a helpful tool for maintenance and quality control because the materials are not destroyed or disturbed; ultrasound imaging is one type of NDT. Ultrasound imaging of heterogeneous materials contains many echoes from the material itself. LÄS MER
2. Evaluation of the iterative kilovoltage cone-beam computed tomography reconstruction method for the Varian TrueBeam system
Master-uppsats,Sammanfattning : Introduction: Radiotherapy is used to treat patients with various types of cancer, where linear accelerators produce the radiation beam used for the treatment. Before each treatment fraction, the patient needs to be correctly positioned according to the treatment plan. LÄS MER
3. Effects of reconstruction parameters on the image quality and quantification of PET images from PET/MRI and PET/CT systems
Master-uppsats,Sammanfattning : Aim: To study how reconstruction parameters affect the positron emission tomography (PET) image quality and quantitative results for the different lesion to background radioactivity ratios in three different PET systems. Introduction: Multimodality imaging that combines magnetic resonance imaging (MRI) or computed tomography (CT) with a PET system can produce medical images containing both functional and anatomical information. LÄS MER
4. Direct Signal Interference Suppression and Target Detection for Low-Cost SDR-Based Passive Bistatic Radar
Master-uppsats, Linköpings universitet/ReglerteknikSammanfattning : Passive radar is a technology for detection of targets using echoes of existing radio transmitter, such as FM-radio. Since only receivers are needed for operation, a passive radar system has the possibility of being implemented using low-cost hardware. LÄS MER
5. Dealing With Speckle Noise in Deep Neural Network Segmentation of Medical Ultrasound Images
Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)Sammanfattning : Segmentation of ultrasonic images is a common task in healthcare that requires time and attention from healthcare professionals. Automation of medical image segmentation using deep learning solutions is fast growing field and has been shown to be capable of near human performance. LÄS MER