摘要:
The quality of ping-based ultrasound imaging is dependent on the accuracy of information describing the precise acoustic position of transmitting and receiving transducer elements. Improving the quality of transducer element position data can substantially improve the quality of ping-based ultrasound images, particularly those obtained using a multiple aperture ultrasound imaging probe, i.e., a probe with a total aperture greater than any anticipated maximum coherent aperture width. Various systems and methods for calibrating element position data for a probe are described.
摘要:
The present invention relates to a method for reconstructing a 3D image from 2D X-ray images acquired with an X-ray imaging system, said method comprising the steps of: a) receiving a set of 2D X-ray images of a region of a patient with said X-ray imaging system, b) computing an initial 3D image within the coordinate system of the X-ray imaging system by using at least part of said 2D X-ray images with their respective projective geometry data; c) projecting said initial 3D image on at least part of said 2D X-ray images and adjusting the respective projective geometry data of said images, said adjustment comprising registration of said images with the projection of the initial 3D image using an image-to-image registration technique; d) computing an updated 3D image using the complete set of 2D X-ray images with their respective adjusted projective geometry data.
摘要:
The invention relates to Method for detecting a phantom, comprising the steps of: arranging a phantom (20) with respect to an object, the phantom (20) comprising a plurality of first calibration fiducials (M i 1 , M i 2 , M i 3 ) in a first plane, acquiring at least one image of said object by means of an x-ray apparatus (3), such that the image contains projections of the object as well as projections (IM i 1 , IM i 2 , IM i 3 ) of at least three first calibration fiducials (M i 1 , M i 2 , M i 3 ), detecting the projections (IM i 1 , IM i 2 , IM i 3 ) of the at least three first calibration fiducials (M i 1 , M i 2 , M i 3 ) in said at least one image, and establishing a correspondence between the 2D image coordinates (I x , I y ) of said projections (IM i 1 , IM i 2 , IM i 3 ) of the at least three first calibration fiducials (M i 1 , M i 2 , M i 3 ) and the 3D coordinates (x, y, z) of said at least three first calibration fiducials (M i 1 , M i 2 , M i 3 ) in a local coordinate system of the phantom (20) for computing the projection matrix (P) or at least an element of the projection matrix (P) at least up to a scale factor (±), which projection matrix relates said 2D image coordinates (I x , I y ) to said corresponding 3D coordinates (x, y, z) in a local coordinate system of the phantom according to ±[I x , I y ,1] T =P[x,y,z,1] T .Further, the invention relates to a method for building a statistical model, particularly for image distortion correction, as well as to a ficucial device and a mobile phantom.
摘要翻译:本发明涉及用于检测体模的方法,包括以下步骤:相对于物体布置模体(20),所述体模(20)包括多个第一校准基准(M i 1,M i 2,M i 3)在第一平面中,通过X射线装置(3)获取所述对象的至少一个图像,使得图像包含对象的投影以及投影(IM i 1,IM i 2,IM 检测至少三个第一校准基准(M i 1,M i 2,M i 3)的至少三个第一校准基准(M i 1,M i 2,M i 3)的投影(IM i 1,IM i 2,IM i 3) i 1,M i 2,M i 3),并且建立所述投影(IM i 1,IM i 2,IM i 3)的2D图像坐标(I x,I y)之间的对应关系, 的至少三个第一校准基准(M i 1,M i 2,M i 3)和所述至少三个第一校准基准(M i 1,M i 2,M)的3D坐标(x,y,z) 我3)在一个局部坐标系 用于计算投影矩阵(P)或至少一个投影矩阵(P)的元素的幻影(20)的至少直到比例因子(±),该投影矩阵将所述2D图像坐标(I x, I y)根据±[I x,I y,1] T = P [x,y,z,1] T在体模的局部坐标系中对应的3D坐标(x,y,z) 本发明涉及用于建立统计模型的方法,特别是用于图像失真校正的方法,以及对于榫形装置和移动体模。
摘要:
Apparatus for radiation therapy combines a patient table, an MRI and a radiation treatment apparatus mounted in a common treatment room with the MR magnet movable through a radiation shielded door to an imaging position. An initial MR image and an initial X-ray image is used to generate an RT program for the patient to be carried out in a plurality of separate treatment steps. Before carrying out the procedure, a registration step is performed using a phantom by which X-ray images are registered relative to MR images to generate a transformation algorithm required to align the MR images of the part of the patient relative to the X-ray images. Prior to each separate treatment step a current MR image of the part of the patient is obtained and the transformation algorithm data is used from the current MR image is used in guiding the RT treatment step.
摘要:
A system and method for image-based registration between images locating (304) a feature in a pre-operative image and comparing (307) real-time images taken with a tracked scope with the pre-operative image taken of the feature to find a real-time image that closely matches the pre-operative image. A closest match real-time image is registered (308) to the pre-operative image to determine a transformation matrix between a position of the pre-operative image and a position of the real-time image provided by a tracker such that the transformation matrix permits tracking real-time image coordinates using the tracker in pre-operative image space.
摘要:
The invention relates to a method for producing 3D tomographic images of an object, whereby a radiation source (1), especially an X-ray source, is moved in relation to the object in a plane of motion (6) about a rotating center. The radiation source (1) emits radiation in a radiation cone (2) whose center beam (3) impinges the object. A correspondingly entrained detector (4) is arranged in said center beam, on the side of the object facing away from the radiation source, and is impinged upon by the radiation attenuated in its intensity by the object. The movement is carried out in such a manner that the center beam (3) is tilted by an angle in relation to the plane of motion (6).
摘要:
A detection device for detecting X rays and signaling the detection to a computer-assisted surgery processor system comprises an X ray detector unit having an X ray detector adapted to be positioned within a radiation field. The X ray detector emits a detection signal upon being excited by an X ray of a given intensity. A transmitter outputs the detection signal in radio frequency. A receiver receives the detection signal in radio frequency and forwards the detection signal to a computer-assisted surgery processor system to signal the detection of the X ray. A method is provided as well.
摘要:
Die Erfindung bezieht sich auf ein Koordinatenmessgerät sowie ein Verfahren zum Messen von Strukturen und/oder Geometrien eines Objektes wie Werkstücks mittels eines Koordinatenmessgerätes unter Verwendung einer Röntgensensorik (Computer-Tomograph) umfassend eine Röntgenstrahlenquellen, zumindest einen die Röntgenstrahlung erfassenden Sensor sowie eine Abschirmung gegenüber Röntgenstrahlung, wobei während des Messens die Röntgensensorik relativ zu dem Objekt, insbesondere das Objekt zu der Röntgensensorik gedreht wird. Um eine hinreichende Abschirmung gegen Röntgenstrahlung sicherzustellen, wird vorgeschlagenn, dass zumindest ein Funktionsbauteil des Koordinatenmessgerätes als die Abschirmung ausgebildet wird.
摘要:
Die Erfindung bezieht sich auf ein Koordinatenmessgerät (110) zum Messen eines Objektes (3) mit einer Röntgensensorik umfassend eine Röntgenstrahlenquelle (10) und zumindest einen die Röntgenstrahlen erfassenden Röntgenstrahlensensor (7), die in x-, y- und/oder z-Richtung des Koordinatenmessgerätes relativ zu dem Objekt positionierbar ist. Um auch Messobjekte größerer Ausdehnung problemlos messen zu können, wird vorgeschlagen, dass die Röntgensensorik (7, 10) in dem Koordinatenmessgerät (10) positionierbar ist.
摘要:
Ein medizintechnisches Gerät (2), insbesondere Strahlentherapiegerät, umfasst einen in einem Isozentrum (8) positionierbaren Patiententisch (18) und ein optisches Koordinatenanzeigesystem (10). Das optische Koordinatenanzeigesystem (10) weist mindestens eine zur Emission eines Prüfstrahles vorgesehene Strahlenquelle (12) auf, insbesondere einen Laserstrahler. Eine vereinfachte und objektivierte Überprüfung der Positioniergenauigkeit des Patiententisches (18) erfolgt über einen Prüfkörper (16) zur Strahlendetektierung. Hierbei umfasst der Prüfkörper (16) zumindest eine aus einer Reihe Photozellen (22) aufgebaute Photozeile (14), deren Position mit der des Patiententisches (18) korreliert ist.