Characteristic features of MR truncation artifacts

Abstract

C American Roentgen Ray Society Truncation artifacts occur in MR imaging because Fourier transforms are used to process MR signal data. These artifacts may alter the intensity, shape, and anatomic detail of structures in the spine. Ring artifacts (Gibb phenomenon) occurring near highly contrasting interfaces represent but one manifestation of truncation artifacts visible on MR images. We review truncation phenomena by providing graphic and phantom models. Ways in which truncation artifacts alter the MR appearance of the spine are discussed. We found that truncation phenomena are reduced most effectively by using a 256 x 256 matrix whenever feasible.

Magnetic resonance imaging (MRI) in syringomyelia

“…In the cervical spinal cord, this can produce a hypo-intense line in the centre. This band is, however, never as hypointense as the signal produced by CSF [6].…”

From A as in Aliasing to Z as in Zipper: Artifacts in MRI

“…If sharp signal intensity discontinuities are sampled with a low spatial frequency (i.e., low spatial resolution), the reconstructed image differs from the original object, because the high-frequency components are missing. This results in a periodic over-and undershoot of signal intensity around the structure which causes the artifact ( Figures 4 a and 4c) [4].…”

Reduction of Ringing Artifacts in the Arterial Phase of Gadoxetic Acid-enhanced Dynamic MR Imaging

“…Truncation artifacts result from the rectangular phase and frequency encoding steps in k-space. 5 A steep change in gadolinium concentration during k-space data acquisition, particularly noted in the arterial phase, produces phase ghosts. [6][7][8] These phenomena are emphasized with rapid injection rate, longer scanning time, and elliptical centric view ordering.…”