Dispersion of paramagnetic tracers in bead packs by T1 mapping: Experiments and simulations

Y. E. Kutsovsky; V. Alvarado; H. T. Davis; L. E. Scriven; B. E. Hammer

doi:10.1016/S0730-725X(96)00212-3

Dispersion of paramagnetic tracers in bead packs by T₁ mapping: Experiments and simulations

Y. E. Kutsovsky, V. Alvarado, H. T. Davis, L. E. Scriven, B. E. Hammer

Radiology

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

NMR imaging was used to study dispersion in 6 mm bead pack. T₁ maps were employed to measure the rate of axial spreading of paramagnetic tracers (GdCl₃) inside the bead pack in the range of flow rate from 0.015 mL/s to 0.175 mL/s. From the T₁ maps, tracer concentration profiles were obtained, which yielded dimensionless axial dispersion coefficient and mean transit time. Spatial variations in the dispersion coefficient were observed at flow rates above 0.08 mL/s. We hypothesized that the observed spatial oscillations in the dispersion coefficient arise from the spatial variations of the velocity distribution. To validate this mechanism we showed by simulation that similar dispersion coefficient variation occur in a layered network.

Original language	English (US)
Pages (from-to)	833-839
Number of pages	7
Journal	Magnetic Resonance Imaging
Volume	14
Issue number	7-8
DOIs	https://doi.org/10.1016/S0730-725X(96)00212-3
State	Published - Dec 17 1996

Keywords

Bead packs
NMR
Paramagnetic tracers

Access

10.1016/S0730-725X(96)00212-3

Fingerprint Dive into the research topics of 'Dispersion of paramagnetic tracers in bead packs by T<sub>1</sub> mapping: Experiments and simulations'. Together they form a unique fingerprint.

Cite this

@article{234ba62bc40142f7ba82d3d73443f12e,

title = "Dispersion of paramagnetic tracers in bead packs by T1 mapping: Experiments and simulations",

abstract = "NMR imaging was used to study dispersion in 6 mm bead pack. T1 maps were employed to measure the rate of axial spreading of paramagnetic tracers (GdCl3) inside the bead pack in the range of flow rate from 0.015 mL/s to 0.175 mL/s. From the T1 maps, tracer concentration profiles were obtained, which yielded dimensionless axial dispersion coefficient and mean transit time. Spatial variations in the dispersion coefficient were observed at flow rates above 0.08 mL/s. We hypothesized that the observed spatial oscillations in the dispersion coefficient arise from the spatial variations of the velocity distribution. To validate this mechanism we showed by simulation that similar dispersion coefficient variation occur in a layered network.",

keywords = "Bead packs, NMR, Paramagnetic tracers",

author = "Kutsovsky, {Y. E.} and V. Alvarado and Davis, {H. T.} and Scriven, {L. E.} and Hammer, {B. E.}",

year = "1996",

month = dec,

day = "17",

doi = "10.1016/S0730-725X(96)00212-3",

language = "English (US)",

volume = "14",

pages = "833--839",

journal = "Magnetic Resonance Imaging",

issn = "0730-725X",

publisher = "Elsevier Inc.",

number = "7-8",

}

TY - JOUR

T1 - Dispersion of paramagnetic tracers in bead packs by T1 mapping

T2 - Experiments and simulations

AU - Kutsovsky, Y. E.

AU - Alvarado, V.

AU - Davis, H. T.

AU - Scriven, L. E.

AU - Hammer, B. E.

PY - 1996/12/17

Y1 - 1996/12/17

N2 - NMR imaging was used to study dispersion in 6 mm bead pack. T1 maps were employed to measure the rate of axial spreading of paramagnetic tracers (GdCl3) inside the bead pack in the range of flow rate from 0.015 mL/s to 0.175 mL/s. From the T1 maps, tracer concentration profiles were obtained, which yielded dimensionless axial dispersion coefficient and mean transit time. Spatial variations in the dispersion coefficient were observed at flow rates above 0.08 mL/s. We hypothesized that the observed spatial oscillations in the dispersion coefficient arise from the spatial variations of the velocity distribution. To validate this mechanism we showed by simulation that similar dispersion coefficient variation occur in a layered network.

AB - NMR imaging was used to study dispersion in 6 mm bead pack. T1 maps were employed to measure the rate of axial spreading of paramagnetic tracers (GdCl3) inside the bead pack in the range of flow rate from 0.015 mL/s to 0.175 mL/s. From the T1 maps, tracer concentration profiles were obtained, which yielded dimensionless axial dispersion coefficient and mean transit time. Spatial variations in the dispersion coefficient were observed at flow rates above 0.08 mL/s. We hypothesized that the observed spatial oscillations in the dispersion coefficient arise from the spatial variations of the velocity distribution. To validate this mechanism we showed by simulation that similar dispersion coefficient variation occur in a layered network.

KW - Bead packs

KW - NMR

KW - Paramagnetic tracers

UR - http://www.scopus.com/inward/record.url?scp=0029955973&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029955973&partnerID=8YFLogxK

U2 - 10.1016/S0730-725X(96)00212-3

DO - 10.1016/S0730-725X(96)00212-3

M3 - Article

C2 - 8970091

AN - SCOPUS:0029955973

VL - 14

SP - 833

EP - 839

JO - Magnetic Resonance Imaging

JF - Magnetic Resonance Imaging

SN - 0730-725X

IS - 7-8

ER -