128 results about "Specific absorption rate" patented technology

The invention relates to a method for determining the position of a body part in a magnetic resonance imaging (MRI) system, the method comprising the following steps: positioning the body part on a body part cushion on a patient table (4) of the MRI system; determining a magnetic stray field with a magnetic field sensor (2) arranged in or on the body part cushion to thus determine position data; transmitting the position data to an evaluation unit by means of a transmission means; determining the position of the body part in the MRI system based on the position data and the fact that the body part is positioned on the body part cushion, by means of the evaluation unit. The invention further relates to a corresponding method for determining a specific absorption rate of a body part in a MRI system, a body part cushion, and a MRI system.

An electronic device includes a plurality of antennas, an antenna index buffer configured to store a used antenna index indicating at least one antenna among the plurality of antennas used in each of a plurality of windows, a used power buffer configured to store power consumption of an antenna corresponding to the used antenna index, and processing circuitry configured to calculate a residual specific absorption ratio (SAR) value of each of the plurality of antennas based on the used antenna index, the power consumption and a correlation matrix, and assign transmission power to each of transmitting antennas based on the residual SAR and an operation mode, the transmitting antennas being among the plurality of antennas.

A dynamic scheduling request framework reduces the need of a user equipment (UE) to reduce peak transmit power when approaching the specific absorption rate (SAR) limit. This preserves the ability of UEs to overcome interference (e.g., when near a cell edge), reducing dropped calls, and retains the advantages of high power UEs (HP UEs), such as power class 2 (PC2) devices. When the combination of the current buffer status report (BSR), indicating more data to transmit, with the current peak transmit power and historical average transmitted power indicates a risk that the UE will violate the SAR limit, logic in the UE and / or the network reduces the number of resource blocks (RBs) allocated to the UE. By dropping the duty cycle of the transmitter, even while retaining the current peak transmit power, the average transmitted power will drop. Upon the SAR violation risk abating, the RB allocation returns to normal.

Methods of arranging and designing antennas to optimize electromagnetic field distributions in the near-field region of an antenna to optimize parameters such as electric field (E-field), magnetic field (H-field), specific absorption rate (SAR), power density (PD), etc. while ensuring specific performance of the antenna in the far-field region in terms of gain, efficiency, radiation pattern, etc.

This invention discloses a detachable electric field probe and calibration method for measuring the specific absorptivity of a vehicle-mounted human body model. The probe includes a metal dipole, a polytetrafluoroethylene (PTFE) ring, a waterproof metal casing, a ferrite magnetic ring, an SMA connector, and a detachable rubber sleeve. To prevent tissue fluid leakage, all components except the radiating element of the metal dipole are housed within the waterproof metal casing. The inner and outer conductors of the SMA connector connect to the upper and lower metal radiating elements, respectively. The ferrite magnetic ring is fitted onto the SMA connector, significantly improving the radiation pattern distortion problem of the electric field probe at low frequencies. The SMA connector connects to an RF receiver and a spectrum analyzer to acquire spectral information and the received power of the electric field probe, which, after calibration, reflects the magnitude of the field strength. This invention enables specific absorptivity measurement over a wide frequency range, featuring small size, low cost, and ease of use. It is suitable for specific absorptivity measurement in vehicle-mounted electromagnetic compatibility testing, medical device evaluation, and related scientific research fields.

A method and an electronic device are provided, The electronic device includes a wireless fidelity (WiFi) module for WiFi communication, memory storing one or more computer programs, and at least one communication processor, for at least one cellular communication, communicatively coupled to the WiFi module and the memory, wherein the one or more computer programs include computer-executable instructions that, when executed by the at least one communication processor individually or collectively, cause the electronic device to, based on identifying that WiFi module is in an OFF state, assign an overall specific absorption rate (SAR) margin assigned to the electronic device for a first period to the at least one cellular communication, based on identifying that the WiFi module is in an ON state and a cumulative SAR value consumed by the WiFi module is less than or equal to a threshold value, assign a first amount of the SAR margin assigned for the first period to the WiFi communication and assign a remaining amount excluding the first amount to the at least one cellular communication, and based on identifying that the WiFi module is in an ON state and the cumulative SAR value consumed by the WiFi module exceeds the threshold value, assign a second amount of the SAR margin assigned for the first period to the WiFi communication, which is greater than the first amount, and assign a remaining amount excluding the second amount to the at least one cellular communication.

Methods, systems, and devices for wireless communication are described. The described techniques relate to various scheduling procedures for wireless communications. In some implementations, a user equipment (UE) may estimate transmit power used within a duration for tracking specific absorption rate (SAR) and may indicate the estimated transmit power to a network. The network may schedule UEs based on the estimated transmit power. In some implementations, a UE may receive a control message including an uplink grant and an indication that monitoring of a physical downlink control channel (PDCCH) is skipped during a discontinuous reception cycle (DRX) on duration. The UE may send a message to accept, in part accept, or reject skipping of PDCCH monitoring. In some implementations, a UE may be configured for multi-user multiple-input multiple-output (MU-MIMO) communication with other UEs. A UE may receive a message indicating parameters of other UEs.

A dynamic scheduling request framework reduces the need of a user equipment (UE) to reduce peak transmit power when approaching the specific absorption rate (SAR) limit. This preserves the ability of UEs to overcome interference (e.g., when near a cell edge), reducing dropped calls, and retains the advantages of high power UEs (HP UEs), such as power class 2 (PC2) devices. When the combination of the current buffer status report (BSR), indicating more data to transmit, with the current peak transmit power and historical average transmitted power indicates a risk that the UE will violate the SAR limit, logic in the UE and / or the network reduces the number of resource blocks (RBs) allocated to the UE. By dropping the duty cycle of the transmitter, even while retaining the current peak transmit power, the average transmitted power will drop. Upon the SAR violation risk abating, the RB allocation returns to normal.

The dynamic scheduling request framework reduces the need to reduce peak transmit power when a User Equipment (UE) approaches Specific Absorption Rate (SAR) limits. This preserves the ability of the UE to overcome interference, for example when near the cell edge, reduces dropouts, and maintains the advantages of High Power UEs (HP UEs), such as Power Class 2 (PC2) devices. If a combination of the current buffer status report (BSR), current peak transmit power, and historical average transmit power—indicating more data to transmit—suggests a risk that the UE is violating SAR limits, logic within the UE and / or network reduces the number of resource blocks (RBs) allocated to the UE. Average transmit power is reduced by lowering the transmitter's duty cycle while maintaining the current peak transmit power. Once the risk of SAR violation is mitigated, RB allocation returns to normal.

Disclosed are a transmission power control method and an electronic device for performing the same. The transmission power control method according to various embodiments may comprise: determining whether the magnitude of a reference signal received from a first base station for transmitting and receiving a first signal is greater than or equal to a set magnitude; determining a ratio of a specific absorption rate of the first signal according to a ratio set in the total specific absorption rate margin; and transmitting the first signal on the basis of the ratio of the specific absorption rate of the first signal.

A method and device are provided in which a proximity sensor of a user equipment (UE) determines an object detection status change for a first antenna of the UE. A processor of the UE controls a transmission power of the first antenna based on the object detection status and one of a first delay period for initial object detection by the proximity sensor or a second delay period of detection status change certainty. The transmission power changes between an upper power level and a lower power level in accordance with a time-averaged specific absorption rate (SAR) (TAS).

The invention relates to the technical field of radio frequency hyperthermia control, and particularly discloses a radio frequency hyperthermia intelligent control method based on micro-disturbance frequency sweeping and multi-mode perception, which comprises the following steps: applying a micro-disturbance radio frequency scanning signal to a treatment target area, and processing feedback data to dynamically reconstruct a real-time dielectric property map of a tissue; fusing the atlas with real-time temperature distribution data obtained by magnetic resonance, calculating instantaneous specific absorption rate distribution and predicting a thermal field evolution trend; constructing an optimization cost function based on the information, and generating a dynamic adjustment instruction for radio frequency power, frequency, phase and multi-antenna array focus position after solving; evaluating the control efficiency through a closed-loop verification mechanism and adaptively optimizing system parameters; by sensing the dynamic change of the dielectric property of the tissue in real time, feed-forward-feedback composite intelligent control over the radio frequency thermal therapy process is achieved, the problem of thermal field mismatch caused by the change of the tissue property in a traditional method is effectively solved, and the accuracy and safety of treatment are improved.

Disclosed herein are related to a device. The device can include a wireless communication interface and one or more processors. The wireless communication interface can transmit data to a remote device. The one or more processors can determine a particular control state from a plurality of control states according to sensor data received from a plurality of sensors. The control states can be for meeting at least one of a specific absorption rate (SAR) or power density (PD) for operation of the wireless communication interface. The one or more processors can control operation of the at least one wireless communication interface according to the particular control state.

The application discloses a kind of FDTD nonlinear conformal filter methods of inhibiting step error of specific absorption rate, comprising: obtaining grid model;Determine the eighth cube in each grid as material domain;The 3x3x3 three-dimensional grid matrix of using preset is scanned to the grid, determine the step grid on the two sides of human tissue / air interface;Optimize the conductivity and dielectric constant of the material domain of step grid, after all step grid is completed optimization, the first electric field component of all grid is calculated;The first electric field component of each material domain vertex of same tissue is linearly interpolated \ extrapolated, obtain the second electric field component of the center of material domain, and calculate local SAR;After obtaining the local SAR of all material domains of same tissue, the tissue average SAR of this tissue is calculated, after obtaining the local SAR of all material domains of different tissues, the 10-g SAR containing different tissues is calculated.The application can effectively inhibit the step error of the local SAR of the complex structure surface of human body, improve the accuracy of SAR statistical result.

A user equipment (UE) in a mobile cellular network implements one or more techniques to perform cross-technology specific absorption rate (SAR) budget allocation. The UE computes an individual SAR budget for each radio access technology (RAT) module of a plurality of RAT modules at the UE based on operational context data associated with the UE. The UE sends each individual SAR budget to a corresponding RAT module of the plurality of RAT modules. The UE then adjusts, at one or more RAT modules of the plurality of RAT modules, transmission parameters based on the corresponding individual SAR budget.

To reduce examination time in an examination performed with a magnetic resonance imaging apparatus.SOLUTION: A method for imaging using a magnetic resonance imaging apparatus according to one embodiment sets imaging conditions and scan regions for each of a plurality of main scans, calculates an execution order of the plurality of main scans based on an SAR (Specific Absorption Rate) waiting time defined as a waiting time when the scan regions partially or entirely overlap among the plurality of main scans and a couch-moving time, and executes the plurality of main scans in the calculated execution order while accompanying movement of a couch on which a subject is placed.SELECTED DRAWING: Figure 2

The invention relates to a circularly polarized wearable antenna loaded with an electromagnetic band gap reflecting surface, which comprises two pairs of bent line structure dipoles which are arranged on the upper surface and the lower surface of an upper PDMS flexible substrate and are orthogonally arranged, and coaxial lines with 50 ohm impedance are respectively connected with the orthogonal centers of the two pairs of dipoles, so that antenna center feeding is realized, and a crossed dipole antenna is formed; the phase delay rings are connected to form a 90-degree phase difference, so that the antenna circular polarization characteristic of a required frequency band is realized; the electromagnetic band gap reflecting surface is composed of a PDMS flexible substrate at the lower layer, bent line annular patches printed on the PDMS flexible substrate and arranged in an array and a grounding surface at the bottommost layer, and each bent line annular patch serves as a reflecting surface unit, so that the effective inductance of the electromagnetic band gap reflecting surface is increased, and the working bandwidth of the electromagnetic band gap reflecting surface is widened; and the electromagnetic band gap reflecting surface is placed at a position 1-13mm below the crossed dipole antenna so as to carry out impedance matching. The antenna is less affected by human body coupling, can be stably applied to the wearable field, and has the advantages of flexibility, broadband, high gain, low profile and low specific absorption rate.

Particular embodiments described herein provide for a tablet computer that can be configured to include a display, an antenna, a plurality of capacitance-based proximity sensors, and a configuration engine. The configuration engine uses the capacitance-based proximity sensors to determine a configuration of the tablet computer when the tablet computer is attached to an accessory. The capacitance-based proximity sensors can be specific absorption rate (SAR) proximity sensors used to determine when to reduce radiation from one or more antenna when the tablet computer is not coupled to the accessory and to determine a configuration of the tablet computer when the tablet computer is coupled to an accessory.

The application discloses an antenna specific absorption rate detection method, device and electronic equipment, and belongs to the field of electronic equipment. The antenna specific absorption rate detection method comprises the following steps: determining L detection channels, and M inductive antennas and detection parameters corresponding to each detection channel according to the working state of N inductive antennas; indicating the detection parameters corresponding to each detection channel to the specific absorption rate sensor, and indicating the connection circuit unit to connect the switch circuit between the M inductive antennas; and performing specific absorption rate detection on the L detection channels by the specific absorption rate sensor according to the detection parameters corresponding to each detection channel; wherein, N is a positive integer greater than 1, M is a positive integer less than or equal to N, and L is a positive integer.

The invention relates to a transmitting coil. The transmitting coil comprises two end rings and a plurality of coil crosspieces, wherein the plurality of coil crosspieces are arranged between the two end rings; the structure of each coil crosspiece comprises a first dielectric layer, a plurality of first metal layers and a plurality of second metal layers, the plurality of first metal layers are distributed and attached to one side of the first dielectric layer, and the plurality of second metal layers are distributed and attached to the other side of the first dielectric layer; and each first metal layer and the second metal layer at the corresponding position of the other side of the first dielectric layer form a capacitor. By using the transmitting coil provided by the invention, the specific absorption rate (SAR) in high-field magnetic resonance scanning can be reduced.

The invention relates to the field of electromagnetic radiation detection, and discloses an electromagnetic radiation absorbed dose detection circuit and method and a portable device, the electromagnetic radiation absorbed dose detection circuit is provided with an electric field voltage conversion module, a low-pass filtering module, a resistance transmission line and a broadband signal receiver which are connected in sequence, and the electric field voltage conversion module is connected with the broadband signal receiver through three sub-conversion modules arranged in a three-dimensional orthogonal structure; three-axis component electric field signals are collected in a radar near field and converted into a plurality of corresponding component voltage signals, each component voltage signal is input into a low-pass filtering module to be filtered, each filtered voltage signal is obtained and sent to a broadband signal receiver through a resistance transmission line to be subjected to electric field calculation, and the electric field is calculated. The corresponding human body electromagnetic exposure specific absorption rate is obtained. According to the invention, the detection of the electromagnetic exposure specific absorption rate of the human body can be effectively realized, the detection precision of the specific absorption rate can be effectively guaranteed, and the detection modes of the electromagnetic exposure specific absorption rate of the human body in a radar near field are diversified.

The invention discloses an antenna transmitting power adjusting method and device, equipment and a medium, and belongs to the technical field of electronic equipment. The antenna transmitting power adjusting method comprises the following steps: when a loudspeaker module and a specific absorption rate sensor are in a working state at the same time, acquiring a first capacitance value acquired by the specific absorption rate sensor through a first data acquisition time slot and a second capacitance value acquired by the specific absorption rate sensor through a second data acquisition time slot; wherein the first data acquisition time slot and the second data acquisition time slot are time slots for the specific absorption rate sensor to acquire capacitance values, and the first data acquisition time slot and the second data acquisition time slot are different acquisition time slots; and adjusting the transmitting power of the antenna module according to the first capacitance value and the second capacitance value.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may select a first transmit power level associated with a first expected radiation power from antenna(s) of the UE. Selection of the first transmit power level is based at least in part on the first expected radiation power complying with a specific absorption rate (SAR) threshold. The UE may increase the first transmit power level to a second transmit power level associated with a second expected radiation power from the antenna(s) of the UE. The increase to the second transmit power level is based on application of an antenna efficiency metric associated with the antenna(s) of the UE to the second expected radiation power to determine a reduced expected radiation power. The UE may perform transmission(s) from the antenna(s) at the second transmit power level based on the reduced expected radiation power satisfying the SAR threshold.

The invention discloses a transmitting power control method and device of equipment and electronic equipment. The method comprises the following steps: acquiring an electrical parameter value of a device, the device supporting a specific absorption rate (SAR) standard; under the condition that the electrical parameter value is smaller than the electrical parameter threshold value, the variable quantity of the electrical parameter value of the equipment in a preset time period is obtained; and under the condition that the variable quantity of the electrical parameter value is smaller than the variable quantity threshold value, controlling the transmitting power of the equipment to be not lower than the current transmitting power. According to the invention, the technical problem of poor user experience caused by direct reduction of the transmitting power of the equipment in order to meet the SAR standard in the prior art is solved.

Embodiments of the present application provide a magnetic resonance scanning and imaging method, and a magnetic resonance imaging system. The method includes: determining a pulse to be adjusted in a scan sequence, the pulse to be adjusted including a first radio-frequency pulse and a first gradient pulse applied along with the first radio-frequency pulse; determining an adjustment factor based on the first gradient pulse and a minimum repetition time related to a specific absorption rate of radio-frequency energy; adjusting the scan sequence based on the adjustment factor; and, using the adjusted scan sequence, performing a diagnostic scan on a site to be examined, to obtain a magnetic resonance image.

The invention discloses a transmitting power adjusting method and device and electronic equipment, and belongs to the technical field of communication. The method comprises the following steps: acquiring sensor data of at least one sensor in the electronic equipment and first transmitting power of an antenna of the electronic equipment; obtaining a predicted specific absorption rate based on the sensor data and the first transmitting power; determining a target power adjustment strategy based on the predicted specific absorption rate; and adjusting the transmitting power of an antenna of the electronic equipment based on the target power adjustment strategy.

Embodiments of the present application relate to the technical field of antennas, and provide an antenna structure and an electronic device. The antenna structure comprises a first radiator, a second radiator, and a tuning component. The first radiator is configured to be electrically connected to a feed source. A first end of the second radiator is grounded. One end of the tuning component is connected to a second end of the second radiator, and the other end of the tuning component is grounded. The tuning component comprises an inductor. When the antenna structure is in a first operating mode: one end of the inductor is connected to the second end, the other end of the inductor is grounded; an inductance value of the inductor is greater than 0 and less than or equal to 10 nh; the first radiator is coupled to the second radiator; a difference between the frequency of a resonance generated by the first radiator and the frequency of a resonance generated by the second radiator is greater than or equal to 100 MHz and less than or equal to 400 MHz; and a current direction on the first radiator is the same as that of the second radiator. In this way, the strength of signals radiated by antenna structures to the external environment is increased while satisfying specific absorption rate requirements.

According to an embodiment, an electronic device may comprise: a communication circuit; at least one processor including processing circuitry; and a memory for storing instructions, wherein the instructions, when executed individually or collectively by the at least one processor, cause the electronic device to: establish a connection with an external device through the communication circuit (190); in a first transmission mode, during a first subperiod of a first time period configured on the basis of a time averaged specific absorption rate feature operation, transmit a signal to the external device on the basis of configuring a first maximum transmission power higher than a maximum transmission power limit value configured on the basis of the time averaged specific absorption rate feature operation; during a second subperiod of the first time period, transmit a signal to the external device on the basis of configuring a second maximum transmission power lower than the maximum transmission power limit value; switch from the first transmission mode to a second transmission mode on the basis of identifying occurrence of a switching event on the basis of information associated with at least one of a channel state, a data size, and a specific absorption rate budget during the signal transmission to the external device; in the second transmission mode, during a third subperiod of a second time period configured on the basis of the specific absorption rate feature operation, transmit a signal to the external device on the basis of configuring a third maximum transmission power equal to or lower than the first maximum transmission power; and during a fourth subperiod of the second time period, transmit a signal to the external device on the basis of configuring a fourth maximum transmission power different from the second maximum transmission power.

The invention discloses a radiation detection method and a radiation detection system. The method comprises the following steps: acquiring the induction capacitance variation of an induction electrode; wherein the induction capacitance variable quantity is determined according to electromagnetic radiation, detected by the induction electrode, of the to-be-detected terminal; outputting specific absorption rate information; wherein the specific absorption rate information comprises the specific absorption rate, and the specific absorption rate is determined based on the induction capacitance variable quantity, so that accurate detection of the electromagnetic radiation of the terminal to be detected is realized. Moreover, the electromagnetic radiation of the to-be-detected terminal can be detected by using the induction electrode, so that the convenience of electromagnetic radiation detection is improved, and the user experience is high.