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Biomedical subjects

I Haber

Publications and source records attributed to I Haber.

At least 19 recordsLinked to original sources
PubMed2005

The University of Maryland electron ring: a platform for study of galactic dynamics on a laboratory scale.

The University of Maryland electron ring (UMER) is a novel experimental storage ring designed to investigate the dynamics of large systems of collisionless particles that nevertheless interact via collective mechanisms. Heavily diagnosed and designed to circulate a 100 mA electron beam at 10 keV for several turns, UMER allows us to follow the evolution of the beam over a large number of dynamical periods. Given the similarity of dynamics between the Coulomb forces and gravitational forces, it is possible to design beam experiments that will simulate such astrophysical events as galactic merger, for instance. The cross-comparison of beam experiments with accelerator simulation codes provides invaluable benchmarks of transient processes akin to, for example, violent relaxation in stellar systems that are otherwise impossible to obtain.

Journal Article↗
PubMed2000

Three-dimensional motion reconstruction and analysis of the right ventricle using tagged MRI.

Right ventricular (RV) dysfunction can serve as an indicator of heart and lung disease and can adversely affect the left ventricle. However, normal RV function must be characterized before abnormal states can be detected. We describe a method for reconstructing the 3D motion of the RV by fitting a deformable model to tag and contour data extracted from multiview tagged magnetic resonance images. The deformable model is a biventricular finite element mesh built directly from segmented contours. Our approach accommodates the geometrically complex RV by using the entire lengths of the tags, localized degrees of freedom, and finite elements for geometric modeling. Also, we outline methods for converting the 3D motion reconstruction results into potentially useful motion variables, such as strains and displacements. The technique was applied to synthetic data, two normal hearts, and two hearts with right ventricular hypertrophy (RVH). Noticeable differences were found between the motion variables calculated for normal volunteers and RVH patients.

Humans↗
PubMed1990

Acquired protein C and S deficiency, inflammatory bowel disease and cerebral arterial thrombosis.

Thromboembolic complications may occur in inflammatory bowel disease. Recently, we had the opportunity to observe a case of a cerebral arterial thrombosis in a young patient with active ulcerative colitis. Investigation of blood coagulation revealed a temporary Protein C, Protein S and Factor II deficiency. To our knowledge, this is the first reported case of a temporary Protein C and S deficiency in a patient with thrombosis and inflammatory bowel disease.

Adult↗
PubMed1990

Enterolithiasis: report of two cases.

Two cases of enterolithiasis of the small intestine are reported. In the first patient, enterolithiasis recurred two years after the discovery of an enterolith due to a stricture of the ileum. An enterolith was found in a huge jejunal diverticulum at post-mortem examination in the second patient. Incidence and diagnosis of enterolithiasis are briefly discussed.

Aged↗