Abstract: The invention relates to an electrode arrangement for generating shock waves by electrical discharging between electrode tips (12, 13), which arrangement is particularly suitable for use as an ESWL (Extracorporal Shock Wave Lithotripsy) electrode in a shock wave source for the pulverization of kidney stones or as an electrode in an apparatus for Extracorporal Shock Wave Therapy (ESWT). The electrode arrangement is characterized notably in that at least one of the electrode tips (12, 13) can be replaceable arranged in an associated electrode holder (14, 15), the electrode tip and the electrode holder being provided with corresponding fitting contours so as to achieve mutual locking. This enables very economical replacement of spent electrode tips by the user.

Abstract: The invention relates to a method for peripheral angiography in which the examination zone and an X-ray imaging system are displaced relative to one another and X-ray images of neighbouring parts of the examination zone are formed in different positions, a contrast image and a mask image being acquired from the X-ray images, and the contrast image and the mask image being subtracted from one another; the invention also relates to an arrangement for carrying out the method. Improved geometrical correspondence between the contrast image and the mask image is achieved in accordance with the invention in that, after contrast medium injection, the displacement is controlled so that the contrast medium bolus is always reproduced in the X-ray images and that the contrast image is acquired from the X-ray image lines which already reproduce the contrast medium whereas the mask image is acquired from the parts of the X-ray images which do not yet reproduce the contrast medium.