Simple through-plane spatial filter for 2D MRI projections

[Display omitted] •Method of removing slowly varying background signal from 2D projection images.•Relies on using a gradient pulse in the third (projected) dimension.•Demonstrated for plant roots in overly watered sandy soil. A simple spatial filter for 2D projection MR imaging is introduced. It wor...

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Veröffentlicht in:Journal of magnetic resonance (1997) 2022-10, Vol.343, p.107287-107287, Article 107287
Hauptverfasser: Fabich, Hilary T., Altobelli, Stephen A., Conradi, Mark S.
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container_title Journal of magnetic resonance (1997)
container_volume 343
creator Fabich, Hilary T.
Altobelli, Stephen A.
Conradi, Mark S.
description [Display omitted] •Method of removing slowly varying background signal from 2D projection images.•Relies on using a gradient pulse in the third (projected) dimension.•Demonstrated for plant roots in overly watered sandy soil. A simple spatial filter for 2D projection MR imaging is introduced. It works in the third (unresolved) direction to eliminate uniform or slowly varying interfering background signals. A constant amplitude gradient pulse in the unresolved direction is applied at the same time as the usual phase encode gradient during 2D acquisition. The filter is demonstrated for root imaging in soil, where background soil water signals can be troublesome. The filter suppresses the soil water signal while preserving the desired signal of plant roots. Fundamental to the operation of the filter is that the roots are sparse in the image domain, meaning there are relatively few pixels with multiple roots present. The performance of the through-plane filter is demonstrated and compares favorably to more conventional in-plane spatial filtering.
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subjects background filter for MRI projections
GENERAL AND MISCELLANEOUS
Gradient filter
magnetic resonance imaging
MRI
OTHER INSTRUMENTATION
Plant root imaging
plant roots
title Simple through-plane spatial filter for 2D MRI projections
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