253 results about "Functional magnetic resonance imaging" patented technology

A method which coordinates proton beam irradiation with an open magnetic resonance imaging (MRI) unit to achieve near-simultaneous, noninvasive localization and radiotherapy of various cell lines in various anatomic locations. A reference image of the target aids in determining a treatment plan and repositioning the patient within the MRI unit for later treatments. The patient is located within the MRI unit so that the target and the proton beam are coincident. MRI monitors the location of the target. Target irradiation occurs when the target and the proton beam are coincident as indicated by the MRI monitoring. The patient rotates relative to the radiation source. The target again undergoes monitoring and selective irradiation. The rotation and selective irradiation during MRI monitoring repeats according to the treatment plan.

Neuro-response data including Electroencephalography (EEG), Functional Magnetic Resonance Imaging (fMRI) is filtered, analyzed, and combined to evaluate the effectiveness of stimulus materials such as marketing and entertainment materials. A data collection mechanism including multiple modalities such as, Electroencephalography (EEG), Functional Magnetic Resonance Imaging (fMRI), Electrooculography (EOG), Galvanic Skin Response (GSR), etc., collects response data from subjects exposed to marketing and entertainment stimuli. A data cleanser mechanism filters the response data and removes cross-modality interference.

A system analyzes neuro-response measurements from subjects exposed to video games to identify neurologically salient locations for inclusion of stimulus material and personalized stimulus material such as video streams, advertisements, messages, product offers, purchase offers, etc. Examples of neuro-response measurements include Electroencephalography (EEG), optical imaging, and functional Magnetic Resonance Imaging (fMRI), eye tracking, and facial emotion encoding measurements.

Disclosed herein are methods for modifying electrical currents in brain circuits through the simultaneous use of focused ultrasound pulse (FUP) and an existing brain-imaging system, such as a functional magnetic resonance imaging (fMRI) system. The methods are used for research, treatment and diagnosis of psychiatric, neurological, and neuroendocrine disorders whose biological mechanisms include brain circuits. The methods include the simultaneous steps of applying FUP to a live neuronal circuit within a brain and monitoring a brain image produced by a brain imaging system during the application of FUP.

A procedure and apparatus are provided which allow rapid positional change in the patient centering in order to facilitate the imaging of blood vessels in a series of different views. This procedure and apparatus can also facilitate the imaging of other tissues of the body at different spatial locations as well. The procedure and apparatus reduce the time required for obtaining the necessary images for a medical imaging examination using a single injection of an MRI or iodinated contrast agent.

A therapeutic apparatus (400, 500) comprising a radiotherapy apparatus (402), a mechanical positioning system, and a magnetic resonance imaging system (404). The radiotherapy apparatus comprises a radiotherapy source (408). The radiotherapy apparatus is adapted for rotating the radiotherapy source at least partially around a subject support. The therapeutic apparatus further comprises a memory containing machine executable instructions (468, 470, 472, 474, 476). Execution of the instructions causes a processor to repeatedly: acquire (100) the magnetic resonance data using the magnetic resonance imaging system; reconstruct (102) a magnetic resonance image (460) from the magnetic resonance data; register (104) a location (462) of the target zone in the magnetic resonance image; generate (106) radiotherapy control signals (464) in accordance with the location of the registered target zone; generate (108) mechanical positioning control signals (466) in accordance with the registered target zone and the radiotherapy control signals; and send (110) the radiotherapy control signals to the radiotherapy system and send (110) the mechanical positioning control signals to the mechanical positioning system.

A system for assessing the medical effectiveness of therapies such as pharmaceutical medications for use in treating central nervous system disorders. Functional magnetic resonance imaging techniques are utilized in measuring neural activity induced by specific activation tasks in specific regions of the brain that are known to be affected by a central nervous system disorder. The levels of neural activity induced in patients subject to the disorder when on and off of the therapy are compared and then compared with normative data generated with respect to healthy individuals under comparable conditions. These comparisons quantify and assess the efficacy of the therapy.

The invention discloses a multimodal brain network feature fusion method based on multi-task learning, and the multimodal brain network feature fusion method based on the multi-task learning includes the steps of preprocessing the obtained functional magnetic resonance imaging (fMRI) images and diffusion tensor imaging (DTI) images, registrating the preprocessed fMRI image to the standard AAL template, carrying out a fiber tracking for preprocessed DTI images, calculating fiber anisotropy (FA) value, and constructing structure connection matrix through the AAL template. Clustering coefficient of each brain area in a function connection matrix and the structure connection matrix is calculated to be regarded as function features and structure features. As two different tasks, the function features and the structure features assess an optimal feature set by solving the problem of multi-task learning optimization. The method uses information with multiple modalities complementing each other to learn simultaneously and to classify, improves the classification accuracy, solves the problems that a single task feature does not consider the correlation between features, and the fact that only one modality feature is used for pattern classification can bring to insufficient amount of information.

An electrode for use on a medical device is disclosed. The electrode may have a main body of electrically conductive material extending along an axis and having a proximal end and a distal end. The body may be configured to emit electrical energy in accordance with a predefined diagnostic or therapeutic function. The body may have a groove disposed over an outermost surface of the body. The electrode may also include a magnetic resonance imaging (MRI) tracking coil disposed in said groove. The MRI tracking coil may comprise electrically insulated wire, for example. A catheter including an electrode, as well as a method for determining the location of an electrode, are also disclosed.

The application features methods, devices, and systems for measuring blood flow in a subject. The computer-implemented methods include receiving functional magnetic resonance imaging (fMRI) data that provides information on at least one of volume or oxygenation of blood at one or more locations in a body over a first predetermined length of time. The methods also include receiving near-infrared spectroscopic (NIRS) imaging or measurement data representing at least one of blood concentration or oxygenation at a first portion of the body over a second predetermined length of time. The methods further include deriving, from the fMRI data corresponding to a second portion of the body, a time varying data set representing changes in blood oxygenation or volume or both blood oxygenation and volume at the second portion over the first predetermined length of time and determining, by a computing device, a time delay and a value of a similarity metric corresponding to a part of the spectroscopic imaging data that most closely matches the time varying data set. The time delay represents a difference between a first time in which blood flows from a third portion in the body to the first portion and a second time in which blood flows to the second portion from the third portion. The value of the similarity metric represents an amount of blood at the second portion. An estimate of a characteristic of at least one of blood flow or blood volume in the second portion at a given time is determined based on the time delay and the value of the similarity metric.

A system and method for accurately producing MR images of selected vascular compartments includes employing a control scan and a tag scan, each including velocity selective modules that suppress signal from blood flowing faster than a given cutoff velocity, to acquire control and tag sets of NMR data that may be subtracted to produce a compartment-specific MR image that is substantially free of information from stationary tissues and blood outside the selective vascular compartments. Accordingly, physiological parameters, such as oxygen saturation (SaO₂), oxygen extraction fraction (OEF), and cerebral metabolic rate of oxygen (CMRO₂), can be generated from the compartment-specific images. Further still, kinetic curves of oxygen exchange can be created, thus providing detailed insight into oxygen exchange dynamics.

The invention discloses a method for preparing brain tissue and vascular entity composite model based on MRI (magnetic resonance imaging) and CTA (CT angiography). The method includes: 1), acquiring image data of head and neck skull, brain tissue, vessel and arterial aneurysm; 2), leading acquired MRI and CTA original image data into three-dimensional reconstruction software, structuring a 3D composite virtual model containing the skull, brain tissue, vessel and arterial aneurysm and outputting to a 3D printer for 3D model printing in a format that the 3D printer can print to acquire the three-dimensional entity composite model containing the skull, brain tissue, vessel and arterial aneurysm. The model is quite high in simulation degree, so that doctors can perform preoperative discussionof surgical planning, preoperative risk assessment and design of operative route or even simulate operation in combination with the model; the brain tissue model is of fluid silicone brain tissue thatcan be pulled apart and can be pulled apart as in actual operation, so that the doctors are more confident, and operation risks are lowered.

A system for using functional magnetic resonance imaging (fMRI) for detecting symptoms indicative of Alzheimer's disease, diagnosing Alzheimer's disease and gauging the efficacy of medications used in treating Alzheimer's disease. The system includes steps involving activating a selected region of the brain which may be affected by Alzheimer's disease using an identity recognition type task, concurrently acquiring task-active MRI data responsive to the task, comparing the patient's task-active MRI data to reference data derived from a database of task-active data from healthy individuals and detecting whether the patient has symptoms related to Alzheimer's disease. The severity of the patient's symptoms and the staging of the disease may also be determined. Also, a medication may be administered to the patient and the efficacy of the medication may be gauged based on the severity of the patient's symptoms.

This invention relates to the use of a quantitative functional MRI (fMRI)—arterial spin-labeling perfusion MRI or absolute T2 mapping MRI or a combination thereof in the non-invasive neuroimaging of a subject's brain in response to stress-inducing psychological stimuli, which can be utilized to predict individual stress reactivity as well as to be used as a human model for testing or optimizing psychopharmacological agents.

A system for detecting neural abnormalities associated with specific central nervous system disorders in patients suspected of suffering from said disorders and for assisting in assessing the staging of said disorders in patients suffering from said disorders. Magnetic resonance imaging (MRI) machines and functional magnetic resonance imaging (fMRI) techniques are used to generate fMRI time series image data with respect to a selected regions of interest in the brain known to be affected by given disorders in response to activation tasks known to induce neural activity specifically in these regions. The fMRI data is used in generating statistically based standards and profiles by which abnormalities can be identified and the staging of disorders can be assessed. The results are diagrammatically or graphically displayed so that the data, standards and profiles can be usefully compared.

The invention discloses a method for acquiring the imaging data of a neuro navigation system, which comprises the following steps of: acquiring scanned images in a functional magnetic resonance imaging mode, wherein the functional magnetic resonance imaging mode comprises BOLD scan cortex functional imaging and DTI scan alba functional imaging; transmitting the scanned images according to DICOM and classifying and converting the scanned images; and according to category, and carrying out the registration and fusion of the neuro navigation structural images and the converted scanned images, wherein the registration and fusion comprises the registration mapping of BOLD activation maps and the fusion of DTI maps. Therefore, the neuro functional images are registered and fused in neuro navigation, cerebral white matter fiber tracks is carried out and used as image data of the neuro navigation system so as to provide a powerful tool for making surgical plan before a surgery and protecting normal brain functions in the surgery and to provide a platform for brain function research.

The present invention provides a fat saturation device to be used in conjunction with a magnetice resonance imaging (MRI) breast coil, which provides padding for the comfort of the patient being imaged while eliminating the skin-air interface, thereby reducing the level of artefacts in the image. The device comprises a coil surface pad that contacts the surface of the coil, the pad having apertures therein through which the patients breasts extend when the patient is positioned on the coil for imaging. Aperture sleeves that are removable or retractable extend from the bottom surface of the coil surface into the apertures of the breast coil. The device comprises a fat saturation material.

The invention discloses a method for measuring the stability and imaging indexes of a nuclear magnetic resonance imaging device and is characterized in that: the images of a water phantom are obtained by adopting the nuclear magnetic resonance imaging device to scan the water phantom, the images are transmitted to a specific nuclear magnetic resonance imaging quality assurance and analysis work station by a DICOM protocol, and then the quality assurance and analysis work station is self started and enters a corresponding measurement process (referring to the figure 1 in the abstract of the process) according to DICOM control elements so as to process and calculate the images of the water phantom; the measuring content includes common nuclear magnetic resonance imaging quality assurance indexes, the shifting indexes which have important significance to Functional MRI, and other indexes; meanwhile, an automatic early warning mechanism is established for auto prompting when an abnormal condition occurs and gives the possible reason, and all measured results are sent into a database for long-term analysis of data and evaluation of running state of the device, so as to offer guidance to relevant technicians to master device state and carry out equipment testing.

A method and system for modeling the pulmonary trunk in 4D image data, such as 4D CT and MRI data, is disclosed. Bounding boxes are detected in frames of the 4D image data. Anatomic landmarks are detected in the frames of the 4D image data based on the bounding boxes. Ribs or centerlines of the pulmonary artery are detected in the frames of the 4D image data based on the anatomic landmarks, and a physiological pulmonary trunk model is fit the frames of the 4D image data based on the detected ribs and anatomic landmarks. The boundary of the pulmonary trunk is detected in order to refine the boundary of the pulmonary trunk model in the frames of the 4D image data, resulting in a dynamic model of the pulmonary trunk. The pulmonary trunk can be quantitatively evaluated using the dynamic model.

A collimator, and in particular a method for making a collimator for use with a small high resolution single-photon emission computed tomographic (SPECT) imaging tool for small animal research. The collimator is sized, both functionally and structurally, particularly smaller than known collimators and appropriately scaled to achieve a highly sensitive collimator which facilitates desired reconstruction resolutions for small animals, as well as compliments other functional imaging modalities such as positron emission tomography (PET), functional magnetic resonance imaging (fMRI), electroencephalography (EEG), and event-related potential (ERP), magneto-encephalography (MEG), and near-infrared optical imaging.

The invention belongs to the field of magnetic resonance imaging, and particularly relates to a three-dimensional graphical lamina positioning method in magnetic resonance imaging. The three-dimensional graphical lamina positioning method comprises the following steps of: loading a two-dimensional reference image to a two-dimensional positioning view and visualizing the two-dimensional reference image in a three-dimensional positioning view; then displaying a lamina graphical object on the two-dimensional and three-dimensional positioning views; and timely updating adjustment in the two-dimensional or three-dimensional positioning view to the three-dimensional or two-dimensional positioning view, wherein positioning reference variation caused by the adjustment is also timely reflected on a parameter editor. The invention also provides a magnetic resonance imaging system. According to the three-dimensional graphical lamina positioning method in the magnetic resonance imaging and the magnetic resonance imaging system thereof, the position and the direction of the three-dimensional graphical object can be intuitively displayed and operated, what you see is what you get, the lamina positioning step is simplified, the operation difficulty is reduced, and the study period is shortened.

The present invention concerns methods for evaluating the emotional response to stimuli, such as marketing communications. The present invention includes a method for correlating an emotional response to brain imaging data, a method identifying an emotional response to a stimulus, and a system for identifying an emotional response to a stimulus. The present invention can incorporate a psychological non-verbal measure, such as AdSAM®, and a neural-physiological measure, functional brain imaging, such as functional magnetic resonance imaging (fMRI), positron emission tomography (PET), or other functional brain imaging modality. For example, in marketing communication research, the emotional response data can be determined for such things as product concepts, advertising (concept and/or finished ads), product attributes, product benefits, brands, logos, tag lines, packaging, music, etc. The method of the invention can also be used to assess emotional response to different purchase options (e.g., retail vs. online), lifestyle issues, product usage situations, and other scenarios. In personnel management studies, the method of the invention can be used to measure employee satisfaction or employee morale.

In NMR/MRI imaging, a location is noted for a point in the imaged space, and referred to a reference location so that the point in imaged space is known thereafter, without the need to locate the point again in further imaging steps. For breast cancer diagnosis and biopsy, a breast holding fixture immobilizes the breast. A volumetric image is taken encompassing a portion of the breast. In the same or a subsequent image, a fiducial mark is detected to determine the position of a holder for a biopsy tool or other modality. The tissue feature can be a tumor, cyst or tubal lesion, made temporarily visible in the image by perfusion with a contrast agent. After the contrast agent dissipates, the location of the tissue feature can still be determined by reference to the position of the fiducial marker, which is optional adjustable by post-imaging metered displacement.

A system and method for providing a dark-blood technique for contrast-enhanced cardiac magnetic resonance, improving visualization of subendocardial infarcts or perfusion abnormalities that may otherwise be difficult to distinguish from the bright blood pool. In one technique the dark-blood preparation is performed using a driven-equilibrium fourier transform (DEFT) preparation with motion sensitizing gradients which attenuate the signal in the ventricular cavities related to incoherent phase losses resulting from non-steady flow within the heart. This dark-blood preparation preserves the underlying contrast characteristics of the pulse sequence causing a myocardial infarction to be bright while rendering the blood pool dark. When applied to perfusion imaging, this dark-blood preparation will help eliminate artifacts resulting from the juxtaposition of a bright ventricular cavity and relatively dark myocardium.