King's College London

Siemens Healthcare Gmbh

Siemens Healthineers Ag

Sebastien Roujol

Radhouene Neji

Li Huang

Rene Botnar

Amedeo Chiribiri

Giulio Ferrazzi

Sarah McElroy

Kuberan Pushparajah

Reza Razavi

Grzegorz Kowalik

A method and a magnetic resonance tomography unit for tracking a medical instrument are disclosed. In the method, a tracking volume is defined enclosing a predefined trajectory of the medical instrument. Two-dimensional (2D) projection images of the tracking volume in presence of the medical instrument are acquired with the magnetic resonance tomography unit from two different view angles. Reference 2D images for the two view angles are determined and a background of the 2D projection images is suppressed. Two sets of 2D coordinates of the medical instrument are extracted from the two 2D projection images and combined to a 3D coordinate set and output on a display.

Device and method for 3D real-time medical instrument tracking

The present techniques relate to a techniques for performing cardiac perfusion imaging in order to detect perfusion defects in the myocardium. The present techniques relate to methods for performing cardiac perfusion imaging by performing at least two image acquisitions using different, customizable saturation delay times, which improves the ability to detect defects.

Method and system for double contrast perfusion imaging

In a method and apparatus for performing magnetic resonance (MR) imaging for generating multiple T1 maps of separate regions of interest of a subject along a first spatial axis, multiple MR pulse sequences are generated, each MR pulse sequence being for imaging a respective one of the separate regions of interest of the subject. In order to generate each of the plurality of MR pulse sequences, a spatially selective preparation pulse is generated exciting the region of interest of the subject and a number of imaging sequences that follow the application of the spatially selective preparation pulse are generated. MR imaging data are acquired during the generation of the multiple imaging sequences. The multiple MR pulse sequences are generated during a period not exceeding 30 seconds.

Method of performing magnetic resonance imaging and a magnetic resonance apparatus

In a method of performing magnetic resonance imaging and a magnetic resonance apparatus, first MR data are acquired of a region of interest of a subject in the absence of a B1 field. Second MR data are acquired of the region of interest in the presence of a B1 field, and within a short time interval after generation of the B1 field. The first and second MR data are processed to determine a B1 field map, and a T1 map is generated using the B1 field map. The T1 map is a B1 corrected T1 map. The first and second MR datamay be acquired as part of a T1 mapping sequence, such as a MOLLI or SASHA type cardiac T1 mapping sequence.

A method of estimating a longitudinal magnetic relaxation T1 time for a region of a subject. The method includes providing a computer with at least two magnetic resonance (MR) images of the region of the subject that were respectively acquired at different times after the generation of a preparation pulse during a MR pulse sequence; in said computer, analyzing said at least two MR images in order to obtain, from the same location in each of the MR images, a pixel value, wherein each of the pixel values and the time at which their respective MR image was acquired form a data point; and in said computer, fitting the data points to a model representing said longitudinal magnetic relaxation by varying a single adjustable parameter to estimate the T1 time constant for the region of interest, wherein the single adjustable parameter represents a T1 time constant within the model.

Method of processing MR images to estimate a longitudinal relaxation time constant

Techniques are disclosed for determining coefficients for use in correcting a magnetic relaxation time constant, T, value obtained via magnetic resonance imaging when a pulse rate was at a first pulse rate value to a T value reflecting the T value that would have been obtained if the pulse rate was at a second pulse rate value. The technique includes, for each region of interest, pairing an obtained derivative, m, and an obtained offset, c, as an ordered pair (c, m). The technique further includes fitting the obtained plurality of ordered pairs (c, m) to a polynomial function, and determining the values of the coefficients from the polynomial function.

Growing community of inventors

Kingston Upon Thames, United Kingdom

Sebastien Roujol