摘要:
An X-ray device for the formation of slice images of an object to be examined including an X-ray source, an X-ray detector, a transport device for moving the object during the acquisition of a series of X-ray projection images of the object in a movement plane situated parallel to the imaging plane, and a control device for controlling the acquisition of the X-ray projection images and the transport device. Slice images of the object are formed from the X-ray projection images by a tomosynthesis method. In order to enable the formation of slice images of large objects to be examined, or of large parts thereof, within a period of time which is as short as possible, the X-ray source and the X-ray detector are stationary during the acquisition of the X-ray projection images and the control device is configured such that the speed of motion of the object and the moments of acquisition of the X-ray projection images are such that all points to be examined in an examination zone of the object are imaged in at least 10, but preferably in at least 50 different X-ray projection images.
摘要:
The invention relates to a method of and a device for determining the position of a medical instrument (4), introduced into the body of a patient (2), relative to a periodically moving organ (3) of the body, which method includes the steps of: a) determining the spatial position (c, r) of the medical instrument (4) and of a reference probe (6) while acquiring at the same time a periodic motion signal (E2) which relates to the periodic motion of the body organ (3), b) selecting a 3D image data set (p) from an image data base which contains 3D image data sets (p) of the body organ (3) which have been acquired pre-operatively and simultaneously with the same motion signal (E1) and are associated with individual motion phases (e1, e2, . . . ), in such a manner that that 3D image data set (p) is selected which is associated with the motion phase (e1, e2, . . . ) during the determination of the spatial position (c, r) of the medical instrument (4) and of the reference probe (6), and c) determining the position of the medical instrument (4) relative to the body organ (3) by converting the spatial position (6) of the medical instrument (4) by means of the positions of the reference probe which are known in space and in the selected 3D image data set.
摘要:
A method for operating an imaging system, and a system, apparatus, and computer-readable medium, that operate in accordance with the method. The method includes providing field-of-view (FoV) information, and automatically selecting at least one recording sequence based on at least one of a particular diagnostic application of interest and the FoV information.
摘要:
A method for generating or reconstruction of three-dimensional (3D) images corresponding to a structure of interest (60) including: acquiring a plurality of image projections corresponding to a structure of interest (60); applying a shape model (66) at a selected 3D seed point (64); and adapting the shape model (66) to represent the structure of interest (60), yielding an adapted shape model. A system for generation and reconstruction of three-dimensional (3D) images. The system (10) includes: an imaging system (12) configured to provide projection data corresponding to a structure of interest (60); and a controller (50) in operable communication with the imaging system (50). The controller (50) is configured to: receive the projection data, (64); apply a shape model (66) at a selected 3D seed point (64); and adapt the shape model (66) to represent the structure of interest (60), thereby yielding an adapted shape model.
摘要:
The invention relates to an examination apparatus and a method for perfusion studies in a patient (1). According to the method, a rotational X-ray device (10) is moved on a closed, preferably non-planar trajectory (T) while continuously generating projections of the patient (1) after the injection of a contrast agent with an injection device (20). The projections are used by a data processing system (30) in a sliding window technique to reconstruct three-dimensional images of the body volume. The resulting sequence of 3D images may be displayed on a monitor (31) to reveal the desired information about the perfusion process.
摘要:
The invention relates to a method of determining the position of a catheter introduced along a guide wire inserted into a body, in which method an image of the guide wire and the body region at the area of the guide wire is acquired by means of an imaging method, the distance traveled by the catheter on the guide wire is measured and the position of the catheter in the body is determined on the basis of the measured distance. The invention also relates to a device for determining the position of a catheter introduced along a guide wire inserted into a body, which device includes sensor means for measuring the distance traveled by the catheter on the guide wire and means for determining the position of the catheter on the basis of the measured distance.
摘要:
The invention relates to a device and a method for producing an image of the heart (5), in which the image is preferably three-dimensional and is reconstructed from a series of X-ray projection pictures from various projection directions. In this connection, the electrocardiogram (7) is recorded in parallel with the X-ray pictures and used by a data processing device (10) to control the picture-taking rate, the X-ray pulse duration, the tube current and/or the tube voltage of the X-ray device (1) in such a way that, during the phase to be displayed of maximum movement of the heart, the mean X-ray exposure rate is higher than during the other phases. The data processing device (10) may furthermore use the electrocardiogram to drive an injection pump (8) for the contrast agent in such a way that an approximately constant contrast display of the vessels is produced with minimum contrast-agent injection despite a variable flowrate in the vascular system.
摘要:
The invention relates to an image processing system that is adapted to generate a three-dimensional image (32) from projections (P, 31) of a body volume which may for example be generated by a rotational X-ray system (10). The image processing system is further adapted to display on a monitor (30) simultaneously at least one of the original projections (31) and the generated 3D-image (32) together with a superimposed representation of a target region like an implantable stent. The user may then change the dimensions and the shape of the target region in any of the displayed images (31, 32) and watch the results in all images (31, 32). As the original projections (31) are free of errors generated by the reconstruction and visualization of the 3D-image (32), their consideration yields an improved geometrical accuracy.
摘要:
The invention relates to a method for the reconstruction of a three-dimensional model of a vascular tree from two-dimensional X-ray projection images (A, B, C) that are taken from different spatial directions. On a first projection image (A) at least one reference point (CA) is specified. The gray-value profiles along the epipolar lines (EB, EC) for said reference point (CA) in other projection images (B, C) are then projected on the projection line (L) of the reference point (CA) and added there punctiformly to form a sum profile (S). The sum profile (S) has an extreme, for example, a gray-value minimum, at the position of the space point (C3D) belonging to the reference point (CA). In this way, it is possible to reconstruct semiautomatically a vascular tree from X-ray projections.
摘要翻译:本发明涉及从不同空间方向拍摄的二维X射线投影图像(A,B,C)重建血管树的三维模型的方法。 在第一投影图像(A)上指定至少一个参考点(C SUB> A SUB>)。 在其他投影图像中的用于所述参考点(C SUB)的沿着线极线(E SUB B,E C C)的灰度值分布( B,C)然后投影在参考点(C SUB)上的投影线(L)上,并且以点一点的形式加到其中以形成总和曲线(S)。 总和简档(S)在属于参考点的空间点(C 3D 3D)的位置处具有例如灰度值最小值的极端(C A> A SUB>)。 以这种方式,可以从X射线投影半自动重建血管树。
摘要:
The invention relates to a method of determining the position of a catheter introduced along a guide wire inserted into a body, in which method an image of the guide wire and the body region at the area of the guide wire is acquired by means of an imaging method, the distance traveled by the catheter on the guide wire is measured and the position of the catheter in the body is determined on the basis of the measured distance. The invention also relates to a device for determining the position of a catheter introduced along a guide wire inserted into a body, which device includes sensor means for measuring the distance traveled by the catheter on the guide wire and means for determining the position of the catheter on the basis of the measured distance.