PL413306A1 - Method for calibration of the diffusion imaging sequences in the dMRI-type experiment carried out on the MR tomograph - Google Patents
Method for calibration of the diffusion imaging sequences in the dMRI-type experiment carried out on the MR tomographInfo
- Publication number
- PL413306A1 PL413306A1 PL413306A PL41330615A PL413306A1 PL 413306 A1 PL413306 A1 PL 413306A1 PL 413306 A PL413306 A PL 413306A PL 41330615 A PL41330615 A PL 41330615A PL 413306 A1 PL413306 A1 PL 413306A1
- Authority
- PL
- Poland
- Prior art keywords
- phantom
- diffusion
- anisotropic
- tomograph
- calibration
- Prior art date
Links
- 238000009792 diffusion process Methods 0.000 title abstract 10
- 238000003384 imaging method Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 title abstract 2
- 239000011159 matrix material Substances 0.000 abstract 4
- 230000003993 interaction Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
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
-
- 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)
- Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- High Energy & Nuclear Physics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (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 kalibracji sekwencji obrazowania dyfuzji w eksperymencie typu DMRI przeprowadzanym w tomografie MR, w którym to eksperymencie oblicza się współczynniki dyfuzji i/lub tensora dyfuzji na podstawie przestrzennego rozkładu macierzy b uzyskanego jako efekt kalibracji. Podczas kalibracji wykonuje się następujące kroki: w polu oddziaływania cewki RF w badanej przestrzeni tomografu MR: umieszcza się anizotropowy fantom dyfuzji, który ma ograniczenie dyfuzji w przynajmniej jednym kierunku wzdłuż jednej z osi układu osi głównych związanych z tym fantomem, o znanych wartościach tensora dyfuzji, który to anizotropowy fantom dyfuzji umieszcza się kolejno w 3 różnych położeniach ortogonalnych względem siebie, a ponadto w miejscu umieszczenia fantomu anizotropowego o znanym rozkładzie tensora dyfuzji umieszcza się fantom izotropowy o znanym współczynniku dyfuzji. Dla każdego położenia fantomu anizotropowego oraz dla położenia fantomu izotropowego wykonuje się pomiary sygnału MRJ, określając z nich następnie wartości macierzy b. Określenia macierzy b dokonuje się dla każdego woksela stałej określonej objętości zawartej jednocześnie wewnątrz fantomu anizotropowego i izotropowego. Uzyskany przestrzenny rozkład macierzy b podaje się jako efekt kalibracji sekwencji typu DMRI dla danego tomografu.The method of calibrating the diffusion imaging sequence in an DMRI experiment performed in an MR tomograph, in which the diffusion coefficients and / or the diffusion tensor are calculated based on the spatial distribution of the matrix b obtained as a result of the calibration. During calibration, the following steps are performed: in the field of interaction of the RF coil in the examined area of the MR tomograph: an anisotropic diffusion phantom is placed, which has diffusion limitation in at least one direction along one of the axes of the main axis system associated with this phantom, with known diffusion tensor values, which anisotropic diffusion phantom is placed successively in 3 different orthogonal positions relative to each other, and in addition to the location of the anisotropic phantom with a known diffusion tensor distribution, an isotropic phantom with known diffusion coefficient is placed. For each position of the anisotropic phantom and for the position of the isotropic phantom, measurements of the MRJ signal are made, then determining the values of matrix b. The matrix b is determined for each voxel of a fixed specific volume contained simultaneously within the anisotropic and isotropic phantom. The obtained spatial distribution of matrix b is given as the result of DMRI type calibration for a given tomograph.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL413306A PL232529B1 (en) | 2015-07-30 | 2015-07-30 | Method for calibration of the diffusion imaging sequences in the dMRI-type experiment carried out on the MR tomograph |
| PCT/EP2016/067964 WO2017017163A1 (en) | 2015-07-30 | 2016-07-27 | A method for calibrating a diffusion imaging sequence during a diffusion mri experiment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL413306A PL232529B1 (en) | 2015-07-30 | 2015-07-30 | Method for calibration of the diffusion imaging sequences in the dMRI-type experiment carried out on the MR tomograph |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PL413306A1 true PL413306A1 (en) | 2017-02-13 |
| PL232529B1 PL232529B1 (en) | 2019-06-28 |
Family
ID=56550892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL413306A PL232529B1 (en) | 2015-07-30 | 2015-07-30 | Method for calibration of the diffusion imaging sequences in the dMRI-type experiment carried out on the MR tomograph |
Country Status (2)
| Country | Link |
|---|---|
| PL (1) | PL232529B1 (en) |
| WO (1) | WO2017017163A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3671344A1 (en) * | 2018-12-20 | 2020-06-24 | Technische Universität Wien | Method for manufacturing a phantom for biological systems |
| PL248072B1 (en) | 2021-05-06 | 2025-10-13 | Akademia Gorniczo Hutnicza Im Stanislawa Staszica W Krakowie | Imaging method in a nuclear magnetic resonance experiment |
Family Cites Families (1)
| 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 |
-
2015
- 2015-07-30 PL PL413306A patent/PL232529B1/en unknown
-
2016
- 2016-07-27 WO PCT/EP2016/067964 patent/WO2017017163A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017017163A1 (en) | 2017-02-02 |
| PL232529B1 (en) | 2019-06-28 |
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