Accelerating MR Elastography by Means of Keyhole Imaging
de Greiff A, Maderwald S, Ladd M
University Hospital Essen
Keyhole imaging is a powerful acceleration technique in dynamic data acquisitions. Although seemingly predestined for MR Elastography (MRE), where subsequent datasets only differ in a very limited frequency range from an initial acquisition, it has not yet been applied. To analyze mechanical sheer wave propagation, one typically acquires phase maps with varying offsets to capture a complete cycle of tissue motion. This study analyzes the potential of keyhole imaging for these sequentially acquired images. We acquired the first phase offset with full k-space coverage and replaced a varying number of central k-space lines for subsequent phase offsets. An acceleration factor of eight was achievable without losing relevant information.