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Vertebral compression fractures (VCFs) present as partial collapses of vertebral bodies and may occur secondary to osteoporosis bone fragility and to metastatic cancer infiltration. The correct diagnosis of nontraumatic VCFs is therefore, fundamental for correct treatment. We aimed to classify VCFs using T1-weighted magnetic resonance images (MRI) of the lumbar spine acquired in the sagittal plane...
Diagnostic measures related to the deterioration of the articular cartilage surfaces of knee joints due to arthritis and other abnormalities may be derived from vibroarthrographic (VAG) signals. In the present work, we explore fractal analysis to parameterize the temporal and spectral variability of normal and abnormal VAG signals. The power spectrum analysis method was used with the 1/f model to...
Monitoring the openness of the temporal arcade and how it changes over time can facilitate improved diagnosis and optimized treatment of plus disease and retinopathy of prematurity. We propose methods for the detection and parametric modeling of the temporal arcade, including Gabor filters to detect retinal vessels and the Hough transform to detect and parameterize parabolic forms. Results obtained...
Contours of benign breast masses and malignant tumors in mammograms differ substantially in their shape and complexity; the former are usually round and smooth, whereas the latter are typically spiculated and irregular. We demonstrate the usefulness of fractal analysis via a frequency domain approach applied to one-dimensional signatures of the two-dimensional contours of breast masses. The 1/f model...
Quantitative analysis of the vascular architecture of the retina can help in monitoring the effects of retinopathy on the visual system. Retinopathy affects the blood vessels in the retina through modification of the shape, width, tortuosity, and the angle of insertion of the temporal arcade. Monitoring the openness of the temporal arcade and changes with treatment can facilitate improved diagnosis...
The monitoring of the effects of diabetes, hypertension, and premature birth on the visual system can be assisted by quantitative analysis of the vascular architecture of the retina. The application of image analysis techniques in ophthalmology becomes possible after the desired features have been detected through the use of an appropriate method. We propose image processing techniques for the detection...
Quantitative analysis of the vascular architecture of the retina as well as changes in the shape, width, and tortuosity of the vessels could assist in the monitoring of the effects of diabetes, arteriosclerosis, hypertension, and premature birth on the visual system. The detection of blood vessels in the retina is an important initial step for most applications of image analysis in ophthalmology....
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