摘要:
A system, apparatus and method are provided for measuring and removing the influence of pulsatility on contrast agent flow in a region of interest of a vascular system of a patient. Once the change of blood speed over the cardiac cycle is known (pulsatility), this influence is removed from acquired image sequence for outcome control such that “quasi-stationary”, regular flow acquisition is passed on to subsequent visualization and analysis processes. A contrast agent injector is also provided that simultaneously measures and uses ECG to inject a known contrast agent at a fixed point over the cardiac cycle or such that a known amount of contrast agent will arrive at a known time at a region of interest in the vasculature of a patient, thus controlling one of the main unwanted variables in an acquisition of blood flow sequences.
摘要:
A method and an apparatus for motion visualization of a moving object in angiographic images are described. In a preferred embodiment of the method, first a mask image of the object of interest is acquired and a sequence of angiographic images of the object in different phases of motion of the object is acquired. Then, a first angiographic subtraction image and at least a second angiographic subtraction image are generated by subtracting the angiographic images from the mask image. Subsequently, a twice subtracted image is generated by subtracting the first angiographic subtraction image from the second angiographic subtraction image. In this way a double subtraction, i.e. a twice subtracted angiography is performed, to facilitate the assessment of the motion.
摘要:
A three-dimensional rotational angiography (3DRA) system, in which a finite element method (FEM) package is incorporated which can read in surface meshes (20b) of a reconstructed 3DRA image of an aneurysm to generate FEM meshes (20a) which are closely approximated to the observed aneurysm (20b) in an iterative process by changing the material properties of the aneurysm used in generating the simulated representations (20a) thereof. Thus, the material properties of the closely approximated simulated representation (20a) can be used in subsequent analysis of the physical properties of the aneurysm under consideration.
摘要:
A method and an apparatus for motion visualization of a moving object in angiographic images are described. In a preferred embodiment of the method, first a mask image of the object of interest is acquired and a sequence of angiographic images of the object in different phases of motion of the object is acquired. Then, a first angiographic subtraction image and at least a second angiographic subtraction image are generated by subtracting the angiographic images from the mask image. Subsequently, a twice subtracted image is generated by subtracting the first angiographic subtraction image from the second angiographic subtraction image. In this way a double subtraction, i.e. a twice subtracted angiography is performed, to facilitate the assessment of the motion.
摘要:
A three-dimensional rotational angiography (3DRA) system, in which a finite element method (FEM) package is incorporated which can read in surface meshes (20b) of a reconstructed 3DRA image of an aneurysm to generate FEM meshes (20a) which are closely approximated to the observed aneurysm (20b) in an iterative process by changing the material properties of the aneurysm used in generating the simulated representations (20a) thereof. Thus, the material properties of the closely approximated simulated representation (20a) can be used in subsequent analysis of the physical properties of the aneurysm under consideration.
摘要:
A washer adapted to minimise contamination by avoiding in use inappropriate crevices. metal annular disc having an annular rebate on at least one face to its outer periphery, and a unitary formation of a flexible medium (e.g. of a food grade rubber) (A) preferably more than filling the or each rebate and (B) surrounding the outer periphery of the disc.
摘要:
A training tool comprising an elongate hollow space enclosed by a holder, which hollow space is partly filled with an amount of freely movable particles, the particles being configured to provide a reactive impact when the particles collide during acceleration and deceleration.
摘要:
In a method for producing intraocular lenses with improved optical properties, applying to the optical part of the lens a coating to protect the surface during one or more processing steps which are carried out under conditions so that the protective coating is essentially insoluble and remains adhered to the lens, and removing the coating by changing the conditions which make the coating adhere to the lens.