T2 inversions with reduced motion artifacts
US-9671483-B2 · Jun 6, 2017 · US
T2 inversions with reduced motion artifacts
US10429536B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10429536-B2 |
| Application number | US-201615089893-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 4, 2016 |
| Priority date | Apr 4, 2016 |
| Publication date | Oct 1, 2019 |
| Grant date | Oct 1, 2019 |
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Abstract
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A method for processing nuclear magnetic resonance (NMR) measurement data includes receiving, with a processor, NMR measurement data obtained from an NMR tool, the NMR measurement data having an echo train affected by a motion artifact, wherein the motion artifact is related to a magnetic field magnitude that varies in a volume of interest due to a motion of the NMR tool. The method further includes reducing, with the processor, an effect on the NMR measurement data of the motion artifact by using a correcting inversion method that models the motion artifact to provide a corrected transverse relaxation time constant (T2) distribution, the correcting inversion method having a multiplicative term having a term that includes at least one local maximum and an optional decay term.
First claim
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What is claimed is: 1. A method for processing nuclear magnetic resonance (NMR) measurement data, the method comprising: receiving, with a processor, NMR measurement data obtained from an NMR tool, the NMR measurement data comprising an echo train affected by a motion artifact, wherein the motion artifact is related to a magnetic field magnitude that varies in a volume of interest due to a motion of the NMR tool; and reducing, with the processor, an effect on the NMR measurement data of the motion artifact by using a correcting inversion method that models the motion artifact to provide a corrected transverse relaxation time constant (T2) distribution, the correcting inversion method comprising a multiplicative term comprising a portion of a periodic function. 2. The method according to claim 1 , wherein the motion artifact is a late motion artifact. 3. The method according to claim 2 , wherein the late motion artifact appears in a latter half of the echo train. 4. The method according to claim 1 , wherein the multiplicative term comprises a decay term and the decay term comprises: A exp ( 1 - e - 1 T exp ) where t is time, A exp is an exponential decay amplitude, and T exp is an exponential decay time constant. 5. The method according to claim 1 , wherein the multiplicative term comprises: A cos cos ( 2 π t T cos ) where t is time, A cos is cosine amplitude, and T cos is cosine period time. 6. The method according to claim 1 , wherein the multiplicative term comprises: f ( t ) = 1 - A cos + A cos cos ( 2 π t T cos ) - A exp ( 1 - e - t T exp ) where t is time, A cos is cosine amplitude, T cos is cosine period time, A exp is an exponential decay amplitude, and T exp is an exponential decay time constant. 7. The method according to claim 1 , wherein the portion of the periodic function comprises at least one period time and the method further comprises averaging the multiplicative term over different period times to provide an averaged multiplicative term. 8. The method according to claim 7 , wherein the averaged multiplicative term comprises: f ( t ) = 1 num ( T cos ) ∑ T cos ( 1 - A cos + A cos cos ( 2 π t T cos ) - A exp ( 1 - e
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Classifications
Relaxometry, i.e. quantification of relaxation times or spin density (G01R33/50 takes precedence) · CPC title
- G01V3/32Primary
operating with electron or nuclear magnetic resonance · CPC title
Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity · CPC title
due to motion, displacement or flow, e.g. gradient moment nulling (G01R33/567 takes precedence) · CPC title
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- What does patent US10429536B2 cover?
- A method for processing nuclear magnetic resonance (NMR) measurement data includes receiving, with a processor, NMR measurement data obtained from an NMR tool, the NMR measurement data having an echo train affected by a motion artifact, wherein the motion artifact is related to a magnetic field magnitude that varies in a volume of interest due to a motion of the NMR tool. The method further inc…
- Who is the assignee on this patent?
- Kischkat Tobias, Coman Radu, Thern Holger Frank, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification G01V3/32. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Oct 01 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).