The Detection of Microaneurysms 7611 Motivation

Microaneurysms are the first ophthalmoscopic sign of diabetic retinopathy 1 . Over and above that, their number is an indication of the progression of the disease. Their detection is therefore crucial for the diagnosis of diabetic retinopathy, for the mass screening, and for the monitoring of the disease. Microaneurysms are tiny dilations of the capillaries. They appear as small reddish isolated patterns of circular shape in color fundus images of the human retina 1 . Their diameter normally...

Vasculature Segmentation Techniques

Mesh-based 3 step method Ladak group John P. Robarts Research Institute, Canada Border-based 3 step method Sonka group University of Iowa Wilhjelm group Technical University of Denmark Figure 9.3 Segmentation techniques applied to plaque imaging volumes. using the lumen wall boundary for shape guidance. The external elastic lamina boundary was then obtained using the internal elastic lamina for shape guidance. Kim et al. 11 imaged the proximal coronary artery vessel wall with highresolution 3-D...

Energy Minimization Method

The discussion in section 8.2.2.2 shows that in an MRF the optimal segmentation solution comes from finding the maximum of the a posteriori probability in Eq. (8.14), which is equivalent to the minimization problem of the energy function of Eq. (8.16). However, because of the large size of high-dimensional random variable X and the possible existence of local minima, it is fairly difficult to find the global optimal solution. Given the image size with I by J and the gray level for each pixel is...

Helical CT Imaging Characteristics

CT was developed in the early 1960s with the first clinical system installed in 1971 26 . Today, there are five generations of CT scanners characterized by different scanning conditions and properties. Helical or spiral CT is the latest generation of scanners that combines a continuous rotation of the X-ray source and ring of detectors with a continuous movement of the examination table. Hence, data are acquired continuously while the patient is moved through the gantry 27, 28 . Figure 4.3...