Patent ID: 7518373
Filing Date: 2009-04-14
Classification: A61B,G01R

Abstract:
1. A magnetic resonance system comprising: a magnet system that generates magnetic fields in an excitation region causing nuclei in an examination subject in the excitation region to be excited and emit a magnetic resonance signal; a reception antenna device comprising a plurality of local coils that receive the magnetic resonance signal, said local coils being disposed in proximity to the examination subject in the excitation region, said reception antenna device comprising a base part and an attachment part detachably placeable on the base part, configured to allow the examination subject to be located between the base part and the attachment part, when attached to each other; an evaluation device that evaluates respective magnetic resonance signals from the local coils; a base coupling element disposed at a predetermined base part location on the base part, and an attachment coupling element arranged at a predetermined attachment part location on the attachment part, said multiple local coils in the attachment part feeding their respective magnetic resonant signals to the evaluation circuit through the attachment coupling element and the base coupling element as long as the attachment part is placed on the base part; and a protective circuit connected between the base coupling element and the evaluation circuit, said protective circuit compensating for a series resistance of each local coil and the attachment element and the base coupling element that exists upon feed of a magnetic resonance signal from that local coil to the evaluation circuit, and said protective circuit detuning the base coupling element when no attachment coupling element is interacting with the base coupling element.