In the characterization of particle morphology via 2D digital image processing, acquisition needs to be done in proper ways. Otherwise, resulting parameters are significantly influenced by procedures. This research characterizes potential variations that can mislead interpretation such as sphericity, roundness, and regularity indices depending on a projection angle at which is taken. Besides, c...

Background. Much of the sedimentary transport and depositional history of Mars may be recorded in the morphologic characteristics of the individual rocks or particles that make up its sedimentary clast population (defined as a rock fragment or grain resulting from the breakdown of larger rocks or bedrock). Measuring morphology is crucial; it retains the best record of sorting and abrasive effec...

BACKGROUND Although left ventricular cardiac geometric indices such as size and sphericity characterize adverse remodeling and have prognostic value in symptomatic patients, little is known of shape distributions in subclinical populations. We sought to quantify shape variation across a large number of asymptomatic volunteers, and examine differences among sub-cohorts. METHODS An atlas was co...

Background Surgical ventricular restoration (SVR) after anterior myocardial infarction with post infarction aneurysm, significantly improves left ventricular (LV) performance. To describe mid-term postoperative changes of shape and performance of the newly created LV and mitral valve function through the classical (SI) and apical (ASI) left ventricular sphericity index, and determinants of mitr...

AIMS exercise may dramatically change the extent of functional mitral regurgitation (MR) and left ventricular (LV) geometry in patients with chronic heart failure (CHF). We hypothesized that dynamic changes in MR and LV geometry would affect exercise capacity. METHODS AND RESULTS this study included 30 CHF patients with functional MR who underwent symptom-limited bicycle exercise stress echoc...

BACKGROUND Passive ventricular constraint provides external cardiac support to reduce left ventricular (LV) wall stress and myocardial stretch, which are primary determinants of LV remodeling. Altered wall strain results in cytokine and reactive oxygen species production, which, in turn, stimulates apoptosis and extracellular matrix disruption and could be an important trigger for adverse globa...

BACKGROUND Functional mitral regurgitation (FMR) occurs commonly in patients with dilated cardiomyopathy (DCM). This study was conducted to explore the role of left ventricular (LV) dyssynchrony in developing FMR in patients with DCM in comparison with geometric parameters of the mitral apparatus. METHODS Twenty patients without FMR and 33 patients with FMR [effective regurgitant orifice area...

Topographical measurements of surfaces yield a lot of data which are usually presented by tables of height coordinates or by contour maps. Here a method is described to characterize the surface geometry by just a few parameters which quantify the functional properties: sphericity, twist and waviness. Examples of applications are given from the field of surface plate measurement. Some measuremen...