Patent application number | Description | Published |
20100016708 | MRI RF ENCODING USING MULTIPLE TRANSMIT COILS - A common method of RF encoding assumes that the Bi field generated by the RF coils is linear, which is likely not the case in many situations. It is therefore desirable to have a method of operating an MR system to reconstruct an image of a subject, wherein the method is capable of also handling arbitrary Bi fields used for RF encoding. Accordingly, such an MR system employing one or more RF coils is disclosed herein. The method comprises obtaining transmit sensitivities and weighting factors for individual RF coils. Each RF coil is activated based on its respective weighting factor to apply RF excitation to a subject under examination in the MR system. MR signals—such as free induction decays (FID) signals or echo signals—generated from the subject in response to the RF excitation are received and processed based on the transmit sensitivities to generate an MR image or spectrum representative of the subject. | 01-21-2010 |
20110026799 | FLIP ANGLE IMAGING WITH IMPROVED B1 MAPPING FOR MULTI-RF TRANSMIT SYSTEMS - A magnetic resonance method includes performing a plurality of magnetic resonance excitation operations each using a different sub-set of a set of radio frequency transmit coils ( | 02-03-2011 |
20110043205 | REAL-TIME LOCAL AND GLOBAL SAR ESTIMATION FOR PATIENT SAFETY AND IMPROVED SCANNING PERFORMANCE - In a method and apparatus to enable increased RF duty cycle in high field MR scans, a specific energy absorption rate (SAR) calculation processor ( | 02-24-2011 |
20110133729 | METHOD AND MONITORING DEVICE FOR PERFORMING AN RF-SAFE MIT SCAN - A method and a monitoring device for performing an RF-safe MIT scan is disclosed in which it is prevented that an RF exposure, especially a specific absorption rate (SAR), imposed on an examination object, especially a patient, exceeds certain limit values during a magnetic induction tomography (MIT) scan. This is achieved on the one hand by an RF simulation method for simulating intended MIT operating parameters and calculating a resulting RF exposure of the object, and on the other hand by a monitoring device for monitoring the RF power which is applied to the object. | 06-09-2011 |
20110163749 | RF SHIMMING WITH RF POWER REGULARIZATION USING A MULTI-CHANNEL RF TRANSMIT SYSTEM FOR MRI - A magnetic resonance system comprises: a magnetic resonance scanner ( | 07-07-2011 |
20120139541 | DETERMINATION OF LOCAL SAR IN VIVO AND ELECTRICAL CONDUCTIVITY MAPPING - A magnetic resonance imaging apparatus produces calculations of local specific energy absorption rates (SAR) by calculating an electrical permittivity map of a subject. The electric permittivity is calculated by measuring the components of the B | 06-07-2012 |
20140239951 | MR ELECTRICAL PROPERTIES TOMOGRAPHY - The invention relates to a method of MR imaging of an object ( | 08-28-2014 |
20150260808 | RF AMPLIFIER CONTROL IN PARALLEL RF TRANSMISSION BASED ON POWER REQUIREMENTS - The present invention relates to a magnetic resonance imaging MRI system ( | 09-17-2015 |
Patent application number | Description | Published |
20090102480 | SHIMMING OF ELECTRIC FIELD FOR ELECTRIC PROPERTIES TOMOGRAPHY - A radio frequency coil system ( | 04-23-2009 |
20090251144 | MAGNETIC RESONANCE IMAGING SYSTEM AND METHOD - The present invention relates to a magnetic resonance imaging system ( | 10-08-2009 |
20100136929 | METHOD AND MULTI-CHANNEL RF TRANSMITTER ARRANGEMENT FOR GENERATING RF FIELDS - A multi-channel RF transmitter arrangement in the form of, or comprising, a plurality RF antennas, antenna elements, coils or coil elements ( | 06-03-2010 |
20100141259 | METHOD AND RF TRANSMITTER ARRANGEMENT FOR GENERATING RF FIELDS - A multi-channel RF transmitter arrangement comprising a plurality of RF transmitter elements (e) like RF antennas, antenna elements, coils or coil elements, for generating an RF field, especially for use in a magnetic resonance imaging (MRI) system for exciting nuclear magnetic resonances (NMR), and a method for generating such an RF field is disclosed. The RF transmitter elements (e) are segmented in a plurality of segments (s | 06-10-2010 |
20110156704 | B1-MAPPING AND B1L-SHIMMING FOR MRI - The invention relates to a method of acquiring MRI image data comprising the following steps: performing a 3-dimensional B1 mapping of a first volume using a first voxel size, selecting an MRI protocol, performing the B1-shim in accordance with the MRI protocol, performing the MRI protocol to acquire MRI imaging data of a second volume using a second voxel size, wherein the first voxel size is larger than the second voxel size, wherein the first volume is larger than the second volume, and wherein the second volume is contained within the first volume. | 06-30-2011 |
20120126800 | APPARATUS AND METHOD FOR DETERMINING AT LEAST ONE ELECTROMAGNETIC QUANTITY - The present invention relates to an apparatus ( | 05-24-2012 |
20120153950 | RF SHIMMED MRI SLICE EXCITATION ALONG A CURVED SPOKE K-SPACE TRAJECTORY - A radio-frequency (RF) shimming apparatus ( | 06-21-2012 |
20120169333 | MOTION MONITORING SYSTEM FOR MONITORING MOTION WITHIN A REGION OF INTEREST - The invention relates to a motion monitoring system ( | 07-05-2012 |
20120179023 | MR IMAGING USING MULTI-CHANNEL RF EXCITATION - The invention relates to a magnetic resonance imaging apparatus comprising an array of two or more RF antennas ( | 07-12-2012 |
20120262174 | METHOD FOR CALCULATING LOCAL SPECIFIC ENERGY ABSORPTION RATE (SAR) IN NUCLEAR MAGNETIC RESONANCE - A method for calculating a local specific energy absorption rate (SAR) on basis of an electric parameter and the mass density of a segmented geometry of an object and a magnetic field vector distribution of a radio frequency (RF) antenna. The values of the electric parameter and the mass density are pre-determined values, while the magnetic field vector distribution is estimated by a magnetic field mapping method based on a magnetic resonance (MR) scan. The magnetic field mapping method based on a magnetic resonance scan can be a Bi mapping method. The invention also relates to a magnetic resonance system by means of which SAR calculation can be done in a relatively short period of time. The invention also relates to a computer program comprising instructions for calculating a local specific energy absorption rate (SAR) according to the above mentioned method. The SAR calculation used in the above mentioned method, system and program is done in the relatively short period of time and as such is practicable in a clinical setting. | 10-18-2012 |
20120306493 | ELECTRIC PROPERTIES TOMOGRAPHY IMAGING METHOD AND SYSTEM - The invention relates to a magnetic resonance method of electric properties tomography imaging of an object, the method comprising: applying an excitation RF field to the object via a coil at a first spatial coil position ( | 12-06-2012 |
20130131433 | THERAPEUTIC APPARATUS - The invention provides for a therapeutic apparatus comprising a tissue heating system ( | 05-23-2013 |
20150051475 | TEMPERATURE DETERMINATION USING B1 FIELD MAPPING - A medical apparatus ( | 02-19-2015 |