In:
Magnetic Resonance in Medicine, Wiley, Vol. 74, No. 5 ( 2015-11), p. 1349-1355
Abstract:
It has previously been demonstrated that increased overlap of spectral bins in three‐dimensional multispectral imaging techniques (3D‐MSI) can aid in reducing residual artifacts near metal implants. However, increasing spectral overlap also necessitates consideration of saturation effects for species with long T 1 values. Here, an interleaved spectral bin acquisition strategy is presented for overlapping 3D‐MSI that allows for flexible choice of repetition times while simultaneously addressing these cross talk concerns. Methods A phantom imaging experiment is used to illustrate the amplified effect of cross talk on 3D‐MSI acquisitions. A methodological approach to address cross talk across a variety of prescribed repetition times is then described. Using the presented principles, a clinical subject with a total hip replacement was imaged to generate T 1 , proton density, and short‐tau inversion recovery contrasts. In addition, a fracture instrumentation case was imaged pre‐ and postcontrast using T 1 ‐weighted spectrally overlapped 3D‐MSI. Results Phantom results demonstrate that conventional spectral interleaving approaches can generate unwanted signal characteristics in heavily overlapped 3D‐MSI. Clinical images using the presented methods successfully demonstrate T 1 , proton density, and inversion recovery image contrasts using heavily overlapped 3D‐MSI. Conclusions Through automated management of spectral bin distributions across multiple interleaves, a variety of longitudinal magnetization contrasts can efficiently be acquired without any clinically relevant cross‐talk impact using heavily overlapped 3D‐MSI. Magn Reson Med 74:1349–1355, 2015. © 2014 Wiley Periodicals, Inc.
Type of Medium:
Online Resource
ISSN:
0740-3194
,
1522-2594
Language:
English
Publisher:
Wiley
Publication Date:
2015
detail.hit.zdb_id:
1493786-4
Permalink
