The author is a Professor of Physics at the Penn State, holder of the Eberly Family Chair in Physics, and the Director of the Penn State Institute for Gravitation and the Cosmos. A Fellow of the American Physical Society and a Foreign Fellow of the National Academy of Sciences, India, Professor Ashtekar has wide ranging interest in astrophysics and cosmology including quantum gravity, general t...

The first step of medical treatment is the diagnosis. This investigation is focused on some fundamental mathematical and physical characteristics of such diagnostic tool, namely the Electrical Impedance Tomography (EIT), a subject of great scientific and public interest (Holder, 2005; Brown, 2003; Lionheart, 2004). The basic EIT’s assumption is that different biological tissues can be distingui...

We read with interest the article by Ono et al. in which a woman experienced onset of redness, itching, and focal hair loss 3 weeks after clipping surgery of her cerebral aneurysm.[3] It was noted that the four metal pins of the Sugita head holder contain allergens such as cobalt, nickel, chromium, and mercury. It was later determined that the woman had a history of contact dermatitis to metal ...

Disclosure: Employment/leadership position: Chris H. Takimoto, Ortho Biotech Oncology Research & Development; Intellectual property rights/inventor/patent holder: None; Consultant/advisory role: None; Honoraria: None; Research funding: None; Ownership interest: None; Expert testimony: None; Other: None. The content of this article has been reviewed by independent peer reviewers to ensure that i...