25 research outputs found
Comparison of quantification and image degrading factors for different iodine isotopes (I-123, I-124 and I-131)
Comparison of quantification and image quality for different iodine isotopes (I-123, I-124 and I-131).
Accelerated partial breast irradiation using robotic radiotherapy: a dosimetric comparison with tomotherapy and three-dimensional conformal radiotherapy
Improving the reconstruction of Yttrium-90 Bremsstrahlung images using Monte Carlo based reconstruction
Automatic Quantification Of Pupil Dilation Under Stress
Response of the autonomic nervous system can be assessed by quantifying the dilation of the pupil of a human placed in darkness. When the intensity of the surrounding light is low, human's pupil dilates to capture a maximum number of photons. This type of dilation is known as dark adaptation. The aim of this study is to test the hypothesis that dark adaptation is slowed proportional to the amount of stress that an individual has experienced. We have developed a new tool for automatic quantification of pupil dilation. Our system uses statistics of the color of the pupil and the iris as well as model-to-image registration and region growing segmentation techniques. Our system has been tested on several images and shows high correlation with hand segmentation