PL437791A1 - Imaging method in nuclear magnetic resonance experiment - Google Patents
Imaging method in nuclear magnetic resonance experimentInfo
- Publication number
- PL437791A1 PL437791A1 PL437791A PL43779121A PL437791A1 PL 437791 A1 PL437791 A1 PL 437791A1 PL 437791 A PL437791 A PL 437791A PL 43779121 A PL43779121 A PL 43779121A PL 437791 A1 PL437791 A1 PL 437791A1
- Authority
- PL
- Poland
- Prior art keywords
- sub
- spatial distribution
- tensor
- spatial
- calculated
- Prior art date
Links
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
- G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
- G01R33/563—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution of moving material, e.g. flow contrast angiography
- G01R33/56341—Diffusion imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/58—Calibration of imaging systems, e.g. using test probes, Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material
Landscapes
- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Vascular Medicine (AREA)
- General Health & Medical Sciences (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Sposób obrazowania w eksperymencie magnetycznego rezonansu jądrowego (MRJ), w którym stosuje się gradienty pola magnetycznego większe od gradientów używanych do obrazowania, w którym to sposobie oblicza się współczynniki tensora dyfuzji na podstawie przestrzennego rozkładu macierzy b(r) uzyskanego jako efekt kalibracji, charakteryzuje się tym, że: przeprowadza się kalibrację (201-203) dla co najmniej trzech różnych, niekolinearnych wektorów gradientu dyfuzji G<sub>d</sub>, ustalając dla każdego z wektorów G<sub>d</sub> wartość macierzy przestrzennej b) i macierzy teoretycznej bti dla każdego woksela o współrzędnej przestrzennej (r) w obrębie przestrzeni obrazowania; określa się (204) przestrzenny rozkład składowych tensora korekcji pola L(r) na podstawie co najmniej trzech układów równań (6), po jednym układzie równań (6) dla każdego wektora G: oblicza się (205) przestrzenny rozkład współczynników tensora dyfuzji (D<sub>r</sub>) z uwzględnieniem wspomnianego przestrzennego rozkładu składowych tensora korekcji pola L(r) na podstawie określonego wzoru; oblicza się (205) przestrzenny rozkład współczynników tensora dyfuzji (D<sub>r</sub>) z uwzględnieniem wspomnianego przestrzennego rozkładu składowych tensora korekcji pola L(r) na podstawie określonego wzoru.The method of imaging in the nuclear magnetic resonance (NMR) experiment, which uses magnetic field gradients larger than those used for imaging, in which the diffusion tensor coefficients are calculated on the basis of the spatial distribution of the b(r) matrix obtained as a result of calibration, is characterized by in that: calibration (201-203) is performed for at least three different, non-collinear diffusion gradient vectors G<sub>d</sub>, setting for each of the vectors G<sub>d</sub> the value of the spatial matrix b ) and the theoretical matrix bti for each voxel with spatial coordinate (r) within the imaging space; the spatial distribution of the components of the field correction tensor L(r) is determined (204) on the basis of at least three systems of equations (6), one system of equations (6) for each vector G: the spatial distribution of the diffusion tensor coefficients (D) is calculated (205) <sub>r</sub>) taking into account said spatial distribution of the components of the field correction tensor L(r) based on a specific formula; a spatial distribution of the diffusion tensor coefficients (D<sub>r</sub>) is calculated (205) taking into account said spatial distribution of the components of the field correction tensor L(r) based on the determined formula.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL437791A PL437791A1 (en) | 2021-05-06 | 2021-05-06 | Imaging method in nuclear magnetic resonance experiment |
| PCT/EP2021/062240 WO2022233440A1 (en) | 2021-05-06 | 2021-05-07 | A correction method for diffusion tensor magnetic resonance imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL437791A PL437791A1 (en) | 2021-05-06 | 2021-05-06 | Imaging method in nuclear magnetic resonance experiment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL437791A1 true PL437791A1 (en) | 2022-11-07 |
Family
ID=83932020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL437791A PL437791A1 (en) | 2021-05-06 | 2021-05-06 | Imaging method in nuclear magnetic resonance experiment |
Country Status (2)
| Country | Link |
|---|---|
| PL (1) | PL437791A1 (en) |
| WO (1) | WO2022233440A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL385276A1 (en) | 2008-05-26 | 2009-12-07 | Instytut Fizyki Jądrowej Pan Im. Henryka Niewodniczańskiego | Anisotropic diffusion phantom for calibration of the optional sequence of visualisation of MR, DTI and method of calibration of any MR tomograph |
| PL232529B1 (en) | 2015-07-30 | 2019-06-28 | Akademia Gorniczo Hutnicza Im Stanislawa Staszica W Krakowie | Method for calibration of the diffusion imaging sequences in the dMRI-type experiment carried out on the MR tomograph |
-
2021
- 2021-05-06 PL PL437791A patent/PL437791A1/en unknown
- 2021-05-07 WO PCT/EP2021/062240 patent/WO2022233440A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022233440A1 (en) | 2022-11-10 |
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