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Method for producing magnet resonance tomography recordings of cyclic movement

A technology of MRI and cyclic motion, applied in the direction of using MRI system for measurement, magnetic resonance measurement, magnetic variable measurement, etc. Avoid beat effects

Active Publication Date: 2017-02-22
SIRONA DENTAL SYSTEMS
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  • Claims
  • Application Information

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Another disadvantage is that wrong or ambiguous maxima of pairwise relationships can lead to distorted results, so this method is not suitable enough

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  • Method for producing magnet resonance tomography recordings of cyclic movement
  • Method for producing magnet resonance tomography recordings of cyclic movement

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Embodiment Construction

[0045] figure 1 The sequence of the method according to the invention is shown schematically at least partially by means of the measurement of the mastication movement. With the aid of MRT systems known from the prior art, the patient's temporomandibular joint is measured during a time interval T during which the patient performs a masticating movement. During the measurement, the radial k-space local trajectories k1, k2, k3...kx are scanned and measurement data are generated in the form of raw data sets r1, r2, r3...rx and stored, for example, in succession in a memory in the storage area of ​​the unit.

[0046] This k-space is scanned according to the golden angle, for example, that is, two time-continuous radial k-space local trajectories k1, k2, k3...kx always form an angle, which is equal to the golden angle, that is, 137.5° or 222.5°, such as figure 2 as shown in .

[0047] Here, only the jaw joint mastication movement is taken as an example to describe the measurem...

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Abstract

Method for producing magnetic resonance tomography images (B) of at least one phase of a cyclic movement, comprising the method steps: production of raw data sets (rl... rx) of the cyclic movement during a recording period (T) having radial or almost radial k-space part trajectories (kl... kx); reconstructing of a series of intermediate images (zl... zy), each from at least one raw data set (rl... rx) with high time resolution at least for each region (region of interest, ROI) of the raw data sets (rl... rx); calculation of a distance matrix (D) from the series of intermediate images (zl... zy), wherein each matrix element (D) corresponds to the distance of a first intermediate image (zl... zy) of the series to the first or a further intermediate image (zl... zy) of the series; fitting of functions (vi... vz) to structures forming in the distance matrix (D) by means of an active contour method and reconstruction of at least one image (B) from the raw data sets (rl... rx), said raw data sets corresponding to intersection (S) of the fitted curves (vl... vz) with a line of the distance matrix (D).

Description

technical field [0001] The invention relates to a method for capturing images of at least one phase of a cyclical movement using magnetic resonance imaging. Background technique [0002] In order to record images of different phases of an object's movement with magnetic resonance imaging, for example the mastication movement of a jaw, usually individual positions of the movement are recorded. A device is required for this purpose, which fixes objects, such as jaws, in different positions. With such fixation, sufficient MRI data for each position can be generated for an image. Of course, the cost of this shooting method is very high, and it cannot reflect the possible dynamic effect, because the dynamic effect will only appear in the real movement process. [0003] If the movement is sufficiently slow, for example the chewing movement takes place sufficiently slowly, sufficient magnetic resonance imaging data can also be generated for each movement phase in a single movemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/56
CPCA61B5/055G01R33/4824G01R33/5608G01R33/56391G01R33/56509A61B5/1128A61B5/4542
Inventor V.拉舍S.旺德拉克
Owner SIRONA DENTAL SYSTEMS