Motion parameter estimation

A motion parameter and motion technology, which is applied in the field of motion parameter estimation of moving targets, can solve the problems of regional underestimation without considering the dynamics of the respiratory system and ventilation amplitude.

Inactive Publication Date: 2015-03-04
KONINKLJIJKE PHILIPS NV
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Problems solved by technology

[0008] Additionally, the maximal inspiratory and expiratory phases can vary locally, leading to regional underestimations of ventilation amplitude
Also, by focusing only on the two phases of respiration or examining each phase separately, the dynamics of the respiratory system are often not considered

Method used

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Embodiment Construction

[0019] A method for estimating motion parameters (eg, amplitude, phase, phase displacement, stiffness, etc.) of a moving object based on a set of 4D images of the object is described below. As used herein, a 4D image set includes 3D images of a moving object over a motion cycle of the moving object that includes a fully expanded phase, a fully contracted phase, a fully expanded phase, and a fully contracted phase. and one or more stages between the fully contracted stage and the fully expanded stage.

[0020] By way of example, a breathing motion cycle includes a full inhalation phase, a full exhalation phase, and phases in between. The cardiac motor cycle includes a phase of maximal dilation, a phase of maximal systole, and phases in between. In general, a muscle consists of fibers that move through phases of maximal contraction, phases of relaxation, and the phases in between. In general, a motion cycle may be associated with any tissue or non-anatomical structure that cyc...

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Abstract

An object motion parameter determiner (122) includes a deformation vector field determiner (210) that determines deformation vector fields for a 4D image set, which includes three or more images corresponding to three or more different motion phases of motion of a moving object. The object motion parameter determiner further includes a volume curve determiner (212) that generates a volume curve for the voxel based on the deformation vector fields. The object motion parameter determiner further includes a model fitter (214) that fits a predetermined motion model to the volume curve. The object motion parameter determiner further includes a parameter determiner (218) that estimates at least one object motion parameter based on the fitted model.

Description

technical field [0001] The present invention generally relates to estimating motion parameters of moving objects and is described with the specific application of computed tomography (CT). However, the invention is also applicable to other imaging modalities. Background technique [0002] Since ventilation is linked to changes in lung volume, lung ventilation is the primary indicator of respiratory system function. In particular, assessing ventilation at the local or regional level is becoming increasingly important for diagnosis (eg for early detection of disease), or for treatment planning (eg for functional avoidance in lung cancer radiotherapy). [0003] Nuclear imaging such as single photon emission computed tomography (SPECT) or positron emission tomography (PET) is the current standard for direct functional assessment of lung ventilation, of which SPECT ventilation / perfusion (SPECT V / Q) is the "golden "standard. Unfortunately, SPECT and PET suffer from low spatial ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/20G06T7/00
CPCG06T2207/10016G06T7/0016G06T7/20G06T2207/30061G06T7/0024G06T2207/10076G06T2207/30048G06T7/30G06T7/251
Inventor S·卡布斯C·洛伦茨T·克林德J·冯贝格
Owner KONINKLJIJKE PHILIPS NV
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