Abstract: An apparatus comprises a sensor configured to detect movement and generate movement data related to at least part of a detected movement; a messaging unit configured to create a message that is configured to include movement information based at least in part upon the movement data; a transmitter in data communication with the messaging unit and configured to transmit the message; and a housing configured to at least partially enclose at least one of the sensor, the messaging unit, and the transmitter, and including a finger grip configured to secure the housing to a human finger. Methods of using the apparatus are also provided.

Abstract: A magnetic resonance imaging apparatus includes a main field magnet (12) for generating a temporally constant magnetic field through an examination region. A radio frequency transmitter (84) excites and manipulates magnetic resonance in selected dipoles in the examination region. A receiver (90) demodulates magnetic resonance signals received from the examination region, a processor (74) reconstructs the demodulated resonance signals into an image representation. A plurality of fingerprint gradient magnetic field coils (24, 26) induce gradient magnetic fields across the temporally constant magnetic field. Each of the fingerprint gradient coils (24, 26) includes a generally spiral winding (32A-32D) having a first crossectional dimension (H) perpendicular to the temporally constant magnetic field which is at least twice a second crossectional dimension (W) in a direction parallel to the temporally constant magnetic field.

Abstract: A trolley cage (58) selectively positions an insert gradient coil (56) along a patient beam (38) of a magnetic resonance apparatus (A). The trolley cage (58) includes a lower cage assembly (62) surrounding a first exterior surface portion of the insert gradient coil (56), an upper cage assembly (60) removably secured to the lower cage assembly (62) and surrounding a second exterior surface portion of the insert gradient coil (56), and a number of wheels (90) secured to the lower cage assembly (62) for permitting the trolley cage (58) to roll along a patient beam (38) extending through an examination region of the magnetic resonance imaging apparatus (A). The trolley cage (58) also includes a number of pneumatic latching mechanisms (92) for locking the trolley cage (58) to the patient beam (38) when the insert gradient coil (56) is positioned at isocenter.