Publications by authors named "Georgios Vlachopoulos"
Purpose: In advanced muscular dystrophies (AMD), quantification of muscle echo-intensity (EI) may be influenced by ultrasound beam attenuation, due to fibrosis and fatty infiltration of muscle tissue. Objective of the study was to compare EI measurements using grayscale analysis between a superficial and whole-muscle region of interest (ROI) in subjects with advanced and mild-to-moderate muscular dystrophy (MMD).
Methods: Thirty-two adult subjects diagnosed with a muscular dystrophy and twenty-five matched healthy controls underwent ultrasound assessment of the biceps brachii (BB), rectus femoris (RF) and tibialis anterior (TA) muscles.
Purpose: To identify intra-lesion imaging heterogeneity biomarkers in multi-parametric Magnetic Resonance Imaging (mpMRI) for breast lesion diagnosis.
Methods: Dynamic Contrast Enhanced (DCE) and Diffusion Weighted Imaging (DWI) of 73 female patients, with 85 histologically verified breast lesions were acquired. Non-rigid multi-resolution registration was utilized to spatially align sequences.
Purpose: Primary goal of this study is to select optimal registration schemes in the framework of interstitial lung disease (ILD) follow-up analysis in CT.
Methods: A set of 128 multiresolution schemes composed of multiresolution nonrigid and combinations of rigid and nonrigid registration schemes are evaluated, utilizing ten artificially warped ILD follow-up volumes, originating from ten clinical volumetric CT scans of ILD affected patients, to select candidate optimal schemes. Specifically, all combinations of four transformation models (three rigid: rigid, similarity, affine and one nonrigid: third order B-spline), four cost functions (sum-of-square distances, normalized correlation coefficient, mutual information, and normalized mutual information), four gradient descent optimizers (standard, regular step, adaptive stochastic, and finite difference), and two types of pyramids (recursive and Gaussian-smoothing) were considered.
Aim: Progress in deciphering the functionality of the human genome sequence in the wake of technological advances in the field of genomic medicine have dramatically reduced the overall costs of genetic analysis, thereby facilitating the incorporation of genetic testing services into mainstream clinical practice. Although Greek genetic testing laboratories offer a variety of different genetic tests, relatively little is known about how either the general public or medical practitioners perceive genetic testing services.
Materials & Methods: We have therefore performed a nationwide survey of the views of 1717 members of the general public, divided into three age groups, from all over Greece, and residing in both large and small cities and villages, in order to acquire a better understanding of how they perceive genetic testing.