Hans Hertz (SIMES Friday Seminar)

Date(s) - Mar 15 2013
11:00 AM - 12:30 PM

Shasta Room, Bldg. 40, Room 361


Liquid-metal-jet sources for high-resolution phase-contrast x-ray bio-imaging

We have introduced a new anode concept for electron-impact x-ray sources, liquid-metal jets. This regenerative anode allows operation of microfocus tubes with an electron-beam power density several orders of magnitude higher than present stationary or rotating anodes. Present systems typically rely on room-temperature liquid-metal alloys and operate with a 5-20 mm spot size in the 10-160 kV range with up to one order of magnitude higher brightness than state-of-the-art x-ray micro-focus tubes.

The source suitable for a wide range of diffraction, scattering, and imaging applications. For bio-imaging, in-line phase contrast with high spatial resolution is of particular interest. Present small-animal imaging applications include high-resolution CT, improved tumour demarcation, and micro-angiography. In the latter we employ CO2-gas as contrast agent and have demonstrated 3D tomography of rat-kidney blood-vessel network and 2D imaging of <8 mm diam blood vessels in mouse ear, all at acceptable dose levels.

Hans Hertz is a Visiting Professor, from the Dept. of Applied Physics, KTH/Albanova, Sweden.