Essays about: "noise suppression"

Showing result 1 - 5 of 45 essays containing the words noise suppression.

1. 1. Speckle suppression in ultrasound images of heterogeneous materials

   University essay from Luleå tekniska universitet/Institutionen för system- och rymdteknik

   Author : Simon Johnsson; [2023]
   Keywords : Ultrasound; non-destructive testing; wiener filter; signal processing;

   Abstract : 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. READ MORE

3. 2. Evaluation of the iterative kilovoltage cone-beam computed tomography reconstruction method for the Varian TrueBeam system

   University essay from

   Author : Tamana Haidari; [2022-03-18]
   Keywords : Medical physics; FDK algorithm; iterative algorithm; CBCT; image quality;

   Abstract : 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. READ MORE

4. 3. Effects of reconstruction parameters on the image quality and quantification of PET images from PET/MRI and PET/CT systems

   University essay from

   Author : Ali Amena Hussain; [2022-03-09]
   Keywords : Medical physics; PET CT; PET MRI; OSEM; BPL; NEMA IQ; positron emission tomography; magnetic resonance imaging; computed tomography; ordered Subset Expectation Maximization; The Bayesian Penalized Likelihood;

   Abstract : 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. READ MORE

5. 4. Direct Signal Interference Suppression and Target Detection for Low-Cost SDR-Based Passive Bistatic Radar

   University essay from Linköpings universitet/Reglerteknik

   Author : Oskar Jonsson; [2022]
   Keywords : passive radar; ECA; LMS; software-defined radio;

   Abstract : 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. READ MORE

6. 5. Dealing With Speckle Noise in Deep Neural Network Segmentation of Medical Ultrasound Images

   University essay from KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

   Author : Olmo Daniel; [2022]
   Keywords : Deep Learning; Ultrasound; Speckle Filtering; Medical Image Segmentation; U-Net; Wavelet Transfrom; Djupinlärning; Ultraljud; Specklefiltrering; Medicinsk bildsegmentering; U-Net; Wavelet transformation;

   Abstract : 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. READ MORE