摘要:
Scan timing of contrast agent study is provided. Ultrasound is used to determine timing of contrast agent inflow and/or outflow. The timing based on the ultrasound scanning controls scanning for MR or CT imaging. The MR or CT contrast agent imaging for MR or CT contrast agents may be synchronized using the ultrasound contrast agent flow.
摘要:
Complex magnetic resonance (MR) image data, acquired from an examination subject that has at least two different spin species, are processed in a method and a device. At least one MR parameter that influences data acquired in an MR data acquisition is determined with spatial resolution. Complex image data are respectively acquired with each of multiple acquisition units in an MR data acquisition at multiple echo times, such that a phase difference between the first spin species and the second spin species is different at least two of the echo times. For multiple image points, a value of the at least one MR parameter is determined so that a function that depends on the at least one MR parameter and the corresponding image point in the complex image data satisfies an extreme condition.
摘要:
In a method to determine an MR system-dependent phase information of a phase value in an MR phase image data set, initial variances are associated with image points of a first phase image data set, and for an additional phase image data set, a phase value and a variance of the phase value for the image points of the additional phase image data set are estimated by a linear transformation of the first phase image data set. The additional image data set is calculated by weighted addition of the phase values of the first phase image data set with the estimated phase values, with the weighting of the two phase values taking place in the addition dependent on the variance belonging to the respective phase value.
摘要:
In a magnetic resonance (MR) system and method to separate an MR system-dependent phase influence from a subject-dependent phase influence in phase values of an MR phase image data set of an examination subject acquired, to which two different tissue types with different resonance frequencies make a signal contribution, the system-dependent phase influence is determined by selecting a contour around a region shown in the MR phase image data set, calculating the system-dependent phase influence in this region with the assumption that the spatial curve of the background phase corresponds to a harmonic or quasi-harmonic function, and subtracting the system-dependent phase influence from the acquired phase image data set to determine the subject-dependent phase influence.
摘要:
In a computerized method and magnetic resonance (MR) system for the supplementation of acquired MR data, at least one supplemented MR data set is determined from multiple acquired, reduced MR data sets that can be acquired with an accelerated acquisition method (such as partially parallel acquisition method, ppa) in which k-space is undersampled. The acquisition can thereby take place in parallel with multiple acquisition coils. In the method and system, a reconstruction kernel is applied to the multiple acquired, reduced MR data sets in order to determine a reconstructed MR data set for an acquisition coil. The reduced MR data set acquired with the acquisition coil is reused in this reconstructed MR data set. The reuse takes place by a combination with weighting with the respective variances.
摘要:
In a method and system for administering a dispersible medical agent to a subject, a volume of medical agent is delivered in vivo to a subject in a substantially non-dispersed state, at a localized site in tissue of the subject. Contemporaneously with administration of the medical agent to the localized site, energy from an energy source is introduced into only adjacent tissue surrounding the localized site. The energy produces a cellular modification of the adjacent tissue that makes the adjacent tissue substantially impermeable to passage of the medical agent therethrough, so the medical agent is encapsulated and is prevented from dispersing into tissue outside of the encapsulation.
摘要:
In a method for marking a predetermined guide path of a medical instrument in particular a needle, at least one guide path having an angle relative to vertical is indicated by means of at least one adjustable indicator unit such as a light source, and a one-dimensional or two-dimensional inclination sensor is used to adjust the at least one indicator unit with regard to the angle relative to vertical.
摘要:
A method for stable support of a needle to be introduced into a patient, a body to be penetrated by the needle is arranged on the patient. The body is made of a substance corresponding in terms of its mechanical properties to body tissue (in particular corresponding to body tissue in terms of visco-elastic coefficients and density) and/or is made of a gel-like substance.
摘要:
An apparatus with a combination of a magnetic resonance apparatus is proposed. The apparatus has at least one main magnet for generating a magnetic field in an examination area for a magnetic resonance measurement and a radiotherapy apparatus which is designed for generating a particle beam. A direction of a speed of the particle beam is aligned substantially in parallel to a direction of a magnetic flux density of the magnetic field.
摘要:
A transmitting or receiving coil assembly for nuclear spin tomographs comprises a multi-layer structure of conducting layers forming inductive components on an insulating support layer. Discrete components such as capacitors are accommodated in recesses of the support layer. Reinforcement members make it possible to increase the mechanical stability of the arrangement.