Through-plane navigator

Abstract

A magnetic resonance scanner () includes a main magnet (), gradient coils () and a gradient coil controller (), one or more RF coils (), an RF transmitter (), an RF receiver (), and one or more processors (). The main magnet () generates a Bfield. The gradient coils () and a gradient coil controller () generate gradients across the Bo field. The one or more RF coils () transmit Bpulses and receive magnetic resonance signals. The RF transmitter () transmits Bpulses to the RF coils to excite and manipulate resonance. The RF receiver () demodulates received resonance signals into data lines. The one or more processors () are connected to the gradient coil controller (), the RF transmitter (), and the RF receiver () and are programmed to control () the RF transmitter and the gradient coil controller to implement an interleaved multi-slice 2D imaging sequence which in each of a plurality of TRs generates a first and second navigation data lines and at least one image data line for each of a plurality of slices. The one or more processors are further programmed to reconstruct () the first navigation data lines from the plurality of slices into a first navigation projection image, reconstruct () the second navigation data lines from the plurality of slices into a second navigation image; and compare () successive navigation projection images to detect and adjust () for 3D motion.