TAILIEUCHUNG - Low-dose ct image denoising using image decomposition and sparse representation

This paper contributes an efficient denoising method for low-dose CT images. A noisy image is decomposed into three component images of low, medium and high frequency bands; noise is mainly presented in the medium and high component images. Then, by exploiting the fact that a small image patch of the noisy image can be approximated by a linear combination of several elements in a given dictionary of noise-free image patches generated from noise-free images taken at nearly the same position with the noisy image, noise in these medium and high component images are effectively eliminated. Specifically, we give new solutions for image decomposition to easily control the filter parameters, for dictionary construction to improve the effectiveness and reduce the running-time. Instead of using a large dataset of patches, only a structured small part of patches extracted from the raw data is used to form a dictionary, to be used in sparse coding. In addition, we illustrate the effectiveness of the proposed method in preserving image details which are subtle but clinically important. Experimental results conducted on both synthetic and real noise data demonstrate that the proposed method is competitive with the state-of-the-art methods. |

• Kĩ thuật Viễn thông
• Computed tomography
• Medical image
• Low dose radiation
• Patch based image denoising
• Image decomposition
• Sparse representation
• Computed body tomography
• Magnetic resonance imaging principles
• Interventional computed tomography
• Normal abdominal
• BMC Veterinary Research
• Head trauma
• Intravenous contrast administration
• The cardiovascular system
• Peripheral computed tomographic angiography
• Micro computed tomography
• Congenital heart disease
• Cone beam computed tomography
• History of x ray computed tomography
• Acquisition of projection images
• Reconstruction algorithms
• Image simulation
• Radiation dose
• Journal of Science and Technology
• X–ray computed tomography
• Ternary polymer blends of poly
• Three–dimensional micro–structure image
• Ternary polymer blends
• Major adverse cardiovascular events
• Coronary artery calcium scanning
• Image reconstruction algorithms
• Cone beam computed tomography technique
• Evaluate many aspects of algorithms
• Method of simulating CBCT systems
• BMC Geriatrics
• Mid thigh computed tomography
• Muscle quality
• Computed tomography attenuation value
• Motor function
• BMC Cancer
• Renal cell
• Positron emission tomography
• Antineoplastic agents
• Planar bone scintigraphy
• Bone metastases
• Prostate cancer
• Breast cancer
• Serum biomarkers
• BMC Musculoskeletal Disorders
• Pedicle screw pull‐out
• Cone‐beam computed tomograph
• Diffuse idiopathic skeletal hyperostosis
• Connecting rod
• BMC Anesthesiology
• Lung quantitative computed tomography
• Computed tomograph
• Reconstruction parameters
• Convolution kernel
• Image reconstruction
• Transmission tomography technique
• Cone beam configuration
• Dimension detector array
• Cardiac Computed Tomography
• Normal Anatomy
• Coronary Artery Calcium
• Coronary Artery Stenoses
• Morphological
• Functional Assessment
• Congenital Abnormalities
• the Coronary Arteries
• Medicine
• magnetic resonance imaging
• CT images
• vascular system
• diagnostic imaging
• Multidetector row CT
• Cardiac imaging
• Current status
• Future directions
• The interventional suite
• Cone beam micro CT for small animal research
• The biliary tract
• The pancreas
• Peritoneal cavity
• The adrenal glands
• Musculoskeletal system
• Pediatric applications
• Nuclear engineering and technology
• Image uniformity with photon counting
• Conventional scintillation single photon emission computed tomography system
• Monte carlo simulation study
• Photon Counting Detector
• The adaptation method
• The monte carlo simulation for computed tomography
• High flux photons
• Monte Carlo simulation
• Human like voxel phantom
• Imaging findings
• Review of the literature
• Four dimensional computed tomography
• Recurrent hyperparathyroidism localized
• Localize parathyromatosis
• The summary of medical philosophic thesis
• Medical philosophic thesis
• Clinical characteristics
• Computed tomography imaging
• Efficiency of mechanical thrombectomy
• Patients with acute ischemic stroke
• Ureteropelvic junction obstruction
• CT scanner
• Distinguish blood
• Pathological kidneys
• BMC Pediatrics
• Fiberoptic endoscopic evaluation of swallowing
• Video fluorographic swallowing
• Pulmonary injury