University of California

Ernesto Zepeda

Mitsuaki A Arakawa

William K Lu

Douglas A Ortendahl

Brenda G Nichols

Louis T Kircos

Matthias Gyori

A matching circuit for a RF coil on an MRI device is disclosed. The matching circuit includes a variable neutralizing inductance on the output side of the matching circuit ground breaker. All variable components are removed from the coil trace board, providing greater access to the tuning components during the MRI operation.

Parasitic compensating matching circuit integral with ground breaker for

An adjustable holder for a magnetic resonance imaging RF surface coil for imaging a part of the body such as the temporomandibular joint. Elements are provided for positioning and securing the RF surface coil at a first predetermined point along a longitudinal axis of the holder and for positioning and securing the RF surface coil at a second predetermined point transverse to the longitudinal axis and at a radial distance R from the longitudinal axis. The preferred embodiment provides orbital movement of the surface coil about the longitudinal axis using a pair of U-shaped runner guides disposed substantially transverse to the longitudinal axis and adjustable clamps in cooperative engagement with the runner guides. The surface coil may be adjusted along a path transverse to the longitudinal axis by way of an adjustable shaft or arm which can be moved inwardly and outwardly, and the surface coil can be pivoted in a step-wise manner using a pivot head having a plurality of equally spaced detents. The pivot head is biased in a direction away from the surface coil and adjustably engages one of the plural detents while rotating about an axis substantially parallel to the longitudinal axis.

Adjustable holders for magnetic reasonance imaging RF surface coil

Growing community of inventors

Daly City, CA, United States of America

Ernesto Zepeda