288 results about "Dynamic contrast" patented technology

A method and a system for simulating the minimally invasive medical procedure of urological endoscopy. The system is designed to simulate the actual medical procedure of urological endoscopy as closely as possible by providing botha simulated medical instrument, and tactile and visual feedback as the simulated procedure is performed on the simulated patient. Particularly preferred features include a multi-path solution for virtual navigation in a complex anatomy, the simulation of the effect of the beating heart on the urethra as it crosses the illiac vessel, and the simulated operation of a guidewire within the urethra In addition, the system and method optionally and more preferably incorporate the effect of dynamic contrast injection of dye into the urethra for fluoroscopy. The injection of such dye, and the subsequent visualization of the urological organ system in the presence of the endoscope, must be accurately simulated in terms of accurate visual feedback. Thus, the system and method provide a complete solution to the complex and difficult problem of training students in urological endoscopy procedures.

A polymer-dispersed liquid crystal based display is embedded inside a lightguide illuminator sheet which provides illumination of the display without the need for a backlight or frontlight. Light from one or more light sources is coupled into the lightguide sheet and is guided within a range of high angles of incidence within the sheet by total internal reflection. The guided light illuminating portions of the display which are in diffusing state is scattered such that some of the light is allowed to escape total internal reflection, providing visibility of the display. Guided light illuminating portions of the display which are in non-diffusing state remains guided within the lightguide illuminator sheet. Combining multiple lightguide embedded displays can be used to provide a three-dimensional display. When a low refractive index cladding is applied to the surfaces of the lightguide embedded display, the display is robust in a dirty environment, and / or can be laminated to adjacent lightguide embedded displays. The use of one or more coupled light sources, such as light emitting diodes, provides color by combining one or more colored light sources or by time-sequentially driving one or more colored light sources. The lightguide illuminator embedded display may further be used as a content dependent active backlight for an LCD display panel to provide improved dynamic contrast.

The invention relates to an intelligent battery management system of an electric car. In the invention, a core control module is connected with N battery data collecting modules via a K bus and is connected with a charging module, a battery pack monitoring module and a touch screen display system; the battery management system comprises a database management module, the battery pack monitoring module, a self-checking control module and an abnormal control module; the battery data collecting modules are provided with a plurality of battery data collecting control chips; and the core control module is connected to computer control software by utilizing a universal serial bus (usb) interface. The battery management system provided by the invention has the advantage of solving the problems that real-time and dynamic comparison cannot be carried out, a corresponding fault processing function and a mutual information platform are lacked and the like in the past. The invention realizes that data such as voltage, current, temperature and the like of a battery are subjected to acquisition, SOC (State of Charge) estimation, real-time communication, equalization and insulation monitoring and compared with each standard datum in a database, so that a dynamic contrast model is established; and due to the adoption of a layered pattern, the control modules are used for controlling the voltage, the current and the temperature. The interaction with users and the warning are carried out through a touch screen.

The invention relates to a dynamic contrast enhancement device and a dynamic contrast enhancement method. The device comprises a color space switching module, a histogram statistical module, an enhanced mapping function module and a brightness transformation module, wherein the color space switching module is used for switching an input image data from a red, green and blue (RGB) color space to aluma and chroma (YUV) color space; the histogram statistical module is used for counting a gray histogram of an image according to a brightness component Y; the enhanced mapping function module is used for calculating weights of a plurality of brightness component intervals in the histogram and obtaining an adaptive mapping function f according to the designed mapping table of each brightness component interval and the weights; and the brightness transformation module is used for transforming the brightness Y of the image to a novel brightness Y' according to the adaptive mapping function f, and outputting the brightness in the RGB color space through the color space switching module. By the device, the image is divided into the plurality of brightness component intervals, the weights arecalculated respectively, and the adaptive mapping function is obtained by a weighting method to transform the image brightness; therefore, the processed image can keep a mean brightness, the contrastis effectively improved, and the problems of level reduction and details loss caused by the traditional histogram equalization are solved.

The invention provides a backlight brightness control method, a backlight brightness control device and a display terminal. The backlight brightness control method provided by the invention includes the following steps that: brightness information of pixel points of a current image is acquired; the global brightness information of the image and the regional brightness information of subregions of the image are acquired respectively; the backlight brightness control value of each subregion is obtained according to the global brightness information and the regional brightness information of each subregion; and the backlight brightness of the image is controlled according to the backlight brightness control value of each subregion. With the backlight brightness control method, the backlight brightness control device and the display terminal of the invention adopted, the backlight brightness of the current image can be dynamically adjusted according to the global brightness information of the image and the regional brightness information of each subregion of the image, and therefore, high dynamic contrast and color saturation can be realized, and at the same time, phenomena of image flicker and uneven brightness when low gray-scale images appear can be avoided.

The invention discloses an image segmentation method for a dynamic contrast-enhanced mammary gland MRI sequence, pertaining to the field of magnetic resonance image processing techniques, which is characterized by comprising the following steps: a three-dimensional magnetic resonance image sequence of the section of the mammary gland is put into a computer; the image is divided into two parts including a mammary gland-air interface and a mammary gland-chest interface; a breast-air boundary is obtained by a splitting transaction in which a dynamic threshold controls the regional growth; an initial profile of the mammary gland and the chest is obtained in the same way, the complex profile of the breast and the chest is obtained with a method of controlling a level set; a three-dimensional magnetic resonance image sequence of a point-in-time is obtained by split jointing the segmentation results and taken as an initial position of the next group three-dimensional image segmentation. The image segmentation method of the invention increases the segmentation speed, solves the problem that a level set algorithm can not easily determine the initial profile and the velocity function and realizes an automatic segmentation of the complex dynamic contrast-enhanced mammary-gland magnetic resonance image with plenty of data.

The invention discloses an integrated dimming method for a liquid crystal display backlight source, and the integrated dimming method comprises the following steps: carrying out the statistics analysis on input images, thus obtaining a backlight dimming factor k (0<=k<=1); integrally changing the backlight brightness according to the k and simultaneously generating an S curve according to the characteristic values of the images; and independently compensating each liquid crystal pixel according to the S curve, wherein the pixel compensation factor with the brightness larger than the inflection point of the S curve is larger than 1 and the pixel compensation factor with the brightness less than the inflection point of the S curve is less than 1, thereby effectively enhancing the display contrast ratio and simultaneously reducing the energy consumption. The invention also discloses a backlight device with a global dimming function, and the backlight device comprises an LED (Light Emitting Diode) light source plate, a video signal interface plate, an LED driving plate, an FPGA (Field Programmable Gate Array) control plate and the like. The dimming algorithm disclosed by the inventioncan be used for enhancing the dynamic contrast ratio and also effectively enhancing the static contrast ratio and can be used for direct descending type backlight and side emitting type backlight.

An apparatus and method for controlling power of a display device is disclosed. Dynamic contrast is widened by controlling contrasts of each LED in the backlight of the display device. The apparatus comprises a video signal analyzer, a liquid crystal display (LCD), vertical gate drivers and horizontal drain drivers, a backlight, a power controller, and a controller. By controlling each LED, clearer video signal, lower dissipating power, and lower heat can be achieved.

The invention discloses an intelligent analysis and assessment system for disease management in a hospital. A user inquiry terminal is used for in-hospital hospital lean management and contrast assessment among hospitals in terms of four dimensions including medical treatment quality, medical treatment efficiency, medical treatment benefit and satisfaction of patients according to assessment results of a hospital management quality assessment module. Various screening, free combination and 360-degree omni-directional dynamic contrast among different dimensions are realized, various screening, combination and omni-directional contrast in the same dimension are also realized, problems of hospital management, ranking and positioning are made clear by big data professional analysis of the hospital, hospital management policy supporting and hospital management contrast in different dimensions, comprehensive contrast and ranking in terms of ICD (international classification of diseases) diagnosis, diagnosis related grouping (DRG) diseases, clinical doctors, clinical departments and hospitals in a region are realized, advantages and disadvantages of contrasted objects in the industry are made clear, clear positioning can be realized, lean management of the hospital is promoted, and comprehensive competition capacity of the hospital is improved.

Aspects of a system and method for processing an image are presented. The method may comprise stretching contrast of an input image based on a distribution of luma values for the input image and a distribution of luma values for a desired output image. The pixels below a specified level of contrast defined by the distribution of luma values for the input image and the distribution of luma values for the desired output image are substantially stretched. The method may also comprise constructing a lookup table of the desired output luma values and stretching a contrast of the input image using the constructed lookup table. The method may also comprise applying linear function and a non-linear function to the distribution of luma values, and applying a stretch factor above a specified level of the distribution and a stretch factor below a specified level of the distribution.

The invention relates to a light-emitting control method for adopting and controlling liquid crystals to emit light from independent light sources for displaying characters, in particular to a dynamic backlight control method for an LED display panel. The control method comprises the following steps: setting at least one control point between two preset fixed threshold values of the average brightness of the full screen, and forming a regulation curve corresponding to backlight brightness between the control point and each of the two fixed threshold values to be used as a reference for backlight regulation; computing the weighted average of the previously computed average brightness value and the subsequently computed average brightness value to acquire the average brightness value of the full screen of the current frame image; and correspondingly regulating the backlight brightness according to the backlight brightness value corresponding to the average brightness value on the regulation curve used as the reference for backlight regulation. Thus, the invention provides a method for dynamically regulating backlight brightness, which overcomes the defect of light leakage of the inherent dark gray scale in liquid crystal display and structure coordination, increases the dynamic contrast, improves the image quality, and realizes the purposes of energy saving and environmental protection.

The invention provides a method, an image analysis software product, and a system for medical imaging analysis for estimating contrast agent extravasation in contrast agent based perfusion imaging such as MRI dynamic contrast enhanced (DCE) imaging, and in particular correction, compensation, or visualization of extravascular leakage of contrast agent in tumors. According to the invention, the effect of extravasation is directly manifested in the tail part of an observed, apparent residue function, R′(t), obtained directly by de-convoluting the expression C(t)=R′(t)Cp′(t) with the arterial input function (AIF). A leakage rate or extravasation constant is determined directly from the tail part of the determined apparent residue function. The invention also relates to distinguishing between T1-dominant and T2*-dominant extravasation effects in perfusion imaging to from the sign of the tail part of the determined apparent residue function and to an automated method for DSC-MRI involving correction for contrast agent extravasation and partial volume effects.

The present invention relates to a processing device and processing method for high dynamic contrast of a liquid crystal display. The processing device comprises a receiver, an inverter and a source driver integrated circuit connected to a center processing module. The processing method comprises: performing a histogram-statistical processing on a received low-voltage differential signal data; obtaining a backlight source luminance control parameter and a gamma reference voltage parameter of the same frame of picture according to the result of the histogram-statistical processing; controlling the luminance of the backlight source according to the backlight source luminance control parameter; and controlling the voltage of a pixel capacitor on the liquid crystal panel according to the gamma reference voltage parameter. The present invention adjusts the luminance of the backlight source and the gamma reference voltage of the liquid crystal panel respectively, whereby enhancing the dynamic contrast of pictures, improving the LCD in terms of the low contrast and flicker, and saving the power consumption of the backlight source.

The present invention relates to a processing device and method for high dynamic contrast of a liquid crystal display device. The processing device comprises a receiver, an inverter and a source driving IC connected to a central processing module, a gamma voltage controller connecting to the source driving IC. The process method comprises: performing histogram statistic processing on a received low voltage differential signaling data; obtaining a backlight source dimming coefficient of picture of a same frame and an I / O gray scale mapping table corresponding to the backlight source dimming coefficient according to result of the histogram statistic processing; controlling to adjust data output to a source driving IC according to the I / O gray scale mapping table; and controlling luminance of a backlight source according to the backlight source dimming coefficient. The present invention adjusts the luminance of the backlight source and the output data of the LCD device concurrently, therefore improves dynamic contrast of pictures, mitigates problems of low contrast and flicker in the LCD, and save the power consumption of the backlight source.

Method and apparatus performing dynamic contrast-enhanced-magnetic resonance imaging on tissue to obtain a plurality of datasets of images. Principal component analysis is performed on each dataset to obtain a covariance matrix and its corresponding eigenvalues and eigenvectors and produce a common base of eigenvectors. The dominant eigenvectors that are not associated with instrumental and random noise, commonly the 2nd eigen-state and the 3rd eigenvectors, or the 1st and 2nd eigen vectors, are correlated with the physiological relevant parameters of the 3TP method to obtain a hybrid method. The fusion of the eigenvectors with the 3TP parameters is dictating a rotation of the two relevant eigenvectors to obtain new rotated eigenvectors that serve to calculate new projection coefficient maps of the rotated eigenvectors for the imaged tissue indicative of physiological relevant parameters reflecting wash-out and wash-in patterns that detect abnormal tissue and distinguishes between cancerous and benign tumors. Computer-readable medium containing program instructions for carrying out the above.

The invention relates to segmenting blood vessels in perfusion MR images, more particularly, the invention relates to automated vessel removal in identified tumor regions prior to tumor grading. Pixels from a perfusion related map from dynamic contrast enhancement (DCE) MR images are clustered into arterial pixels and venous pixels by e.g. a k-means class cluster analysis. The analysis applies parameters representing the degree to which the tissue entirely consists of blood (such as relative blood volume (rBV), peak enhancement (ΔR2max) and / or post first-pass enhancement level (ΔR2p)) and parameters representing contrast arrival time at the tissue (such as first moment of the area (fmAUC) and / or contrast arrival time (T0)). The artery and venous pixels are used to form a vessel mask. The invention also relates to a computer aided diagnostic (CAD) system for tumor grading, comprising automated tumor segmentation, vessel segmentation, and tumor grading.

The invention discloses a liquid crystal display device, a driving device and a driving method thereof. The liquid crystal display device comprises a display screen, a first substrate and a second substrate which are oppositely arranged, a first liquid crystal layer filled between the first substrate and the second substrate, a plurality of first pixels arranged in matrixes are formed on the second substrate; a backlight positioned behind the display screen for providing light source for the display screen, wherein, an adjusting screen is arranged between the display screen and the backlight and used for dynamically adjusting the intensity of the incident light of the display screen; the adjusting screen includes a third substrate and a fourth substrate which are oppositely arranged, a second liquid crystal layer filled between the third substrate and the fourth substrate, and a plurality of second pixels arranged in matrixes are formed on the fourth substrate; the position of the adjusting screen is aligned with the display screen, and the second pixels of the adjusting screen correspond to the first pixels of the display screen one to one. The adjusting screen in the liquid crystal display device of the invention can adjust the size of the incident light of the display screen in real time in the range of the pixel area according to the input signals of the display screen so as to improve the dynamic contrast of the display screen.

The invention provides a method, an image analysis software product, and a system for medical imaging analysis for estimating contrast agent extravasation in contrast agent based perfusion imaging such as MRI dynamic contrast enhanced (DCE) imaging, and in particular correction, compensation, or visualization of extravascular leakage of contrast agent in tumors. According to the invention, the effect of extravasation is directly manifested in the tail part of an observed, apparent residue function, R′(t), obtained directly by de-convoluting the expression C(t)=R′(t)Cp′(t) with the arterial input function (AIF). A leakage rate or extravasation constant is determined directly from the tail part of the determined apparent residue function. The invention also relates to distinguishing between T1-dominant and T2*-dominant extravasation effects in perfusion imaging to from the sign of the tail part of the determined apparent residue function and to an automated method for DSC-MRI involving correction for contrast agent extravasation and partial volume effects.

The invention discloses an adjustment method of the contrast of a liquid crystal display, and the adjustment method comprises the following steps: a backlight source is divided into at least one independent drive region; a drive signal is generated by utilizing the signal in at least one region; the maximum brightness valve of the backlight source is adjusted according to the drive signal. The invention further discloses an adjustment device of the contrast of the liquid crystal display, and the adjustment device comprises the backlight source, a signal generation unit and a drive unit. The application of the invention can adjust the brightness value of the backlight source according to the maximum brightness value of various colors of an image to be displayed by the liquid crystal display device, and the correction to a video signal is further carried out to ensure the brightness value of the displayed image not to be reduced along with the decrease of the brightness of the backlight source, thereby reducing the power loss of the backlight source, improving the dynamic contrast ratio of the liquid crystal display and realizing the self-adaptive brightness adjustment of the backlight source of the liquid crystal display.

There is provided scaffolds for tissue repair / augmentation / implant comprising an acellular matrix, a biocompatible polymer and a biomimetic agent. The scaffolds advantageously supports cell growth in the target tissue. There is also provided a method for the preparation of the scaffold and for monitoring the functionality of the scaffold in tissue using dynamic contrast-enhanced magnetic resonance imaging.

The present invention discloses a method and an apparatus for applying a dynamic contrast expansion technique to plasma display panels through performing a gamma conversion for the inputted image to convert the relationship of the brightness and gray level of the inputted image into a linear relation, performing a subtraction for the gray level value of the image to maintain the image at its smallest color deviation, analyzing the image property histogram to compute the maximum gray level and the minimum gray level required for carrying out the image contrast expansion and obtaining an image contrast expansion gain, and adopting an average of several previously inputted image contrast expansion gains and a current image contrast expansion gain as the contrast expansion gain used in the actual contrast expansion gain formula, so as to compute a new outputted gray level value after the image contrast expansion is performed.

A method and a system for simulating the minimally invasive medical procedure of bilio-pancreatic duodenoscopy. The system is designed to simulate the actual medical procedure of bilio-pancreatic duodenoscopy as closely as possible by providing both a simulated medical instrument, and tactile and visual feedback as the simulated procedure is performed on the simulated patient. Particularly preferred features include a multi-path solution for virtual navigation in a complex anatomy. In addition, the system and method optionally and more preferably incorporate the effect of dynamic contrast injection of dye into the papilla for fluoroscopy. The injection of such dye, and the subsequent visualization of the bilio-pancreatic organ system in the presence of the duodenoscope, must be accurately simulated in terms of accurate visual feedback. In addition, the bilio-pancreatic organ system is optionally and more preferably modeled as a plurality of splines, most preferably arranged as a tree of splines or other branched structure. Thus, the system and method provide a complete solution to the complex and difficult problem of training students in bilio-pancreatic duodenoscopy procedures.

A magnetic resonance imaging (MRI) methodology is provided for simultaneous measurement of dynamic susceptibility contrast (DSC) MRI and dynamic contrast enhanced (DCE) MRI perfusion and permeability parameters using a combination of dual echo and spiral acquisition techniques with no contrast agent preload. T1 and T2 / T2* leakage effects are eliminated, thereby permitting accurate measurement of blood volume, blood flow and vascular permeability which are used in evaluating tumor angiogenesis.

The present invention relates to a method of performing dynamic contrast enhanced magnetic resonance imaging of an object (10) with signal separation for water and fat, the method comprising acquiring magnetic resonance datasets in the k-space using Dixon acquisition in a chemical shift encoding space and dynamic time resolution in a dynamic time space, wherein the dataset acquisition is performed employing undersampling, wherein the method further comprises: applying a compressed sensing reconstruction technique in the k-space, the chemical shift encoding space and the dynamic time space, said compressed sensing reconstruction resulting in reconstructed datasets, —performing Dixon reconstruction on the reconstructed datasets and dynamic contrast analysis on the Dixon reconstructed datasets.

Methods for assessing contrast-enhanced lesions using a dynamic contrast-enhancing magnetic resonance imaging system are provided. A boundary of a contrast-enhanced lesion is objectively and automatically determined. The kinetic behavior of voxels is quantitatively examined. The wash-out volume fraction relative to the lesion volume is used as a biomarker to characterize the lesion as malignant or benign.

This invention relates to a processing device and processing method of high dynamic contrast for liquid crystal display apparatus, the processing device comprises a receiver, an inverter, and a source driving IC connected with a central processing module. The processing method includes: performing a histogram statistical process on received low voltage Differential Signaling data; obtaining a backlight source dimming coefficient and a Gamma reference voltage parameter of the same frame of picture according to the result of the histogram statistical process. controlling the brightness of the backlight source according to said backlight source dimming coefficient; controlling the voltage of the pixel capacitor on the liquid crystal panel according to said Gamma reference voltage parameter. This invention respectively adjusts the brightness of the backlight source and the voltage of the pixel capacitor of the liquid crystal panel simultaneously, and hence the dynamic contrast of the picture is increased, the problems of lower contrast and flicker of TFT liquid crystal display apparatus are ameliorated, and the power consumption of the backlight source is saved.

A timing controller in an LCD has an OTP memory—a one time programmable nonvolatile memory or a MTP memory—a multiple time programmable nonvolatile memory embedded in for storing lookup tables of overdrive functions, dynamic contrast adjustments, independent RGB Gamma curve corrections, and data conversion of cyclic DAC functions. The logic process of the OTP memory and the logic process of the timing controller are completely compatible, and the logic process of the MTP memory only needs two or three photomask processes more than the logic process of the timing controller.

The invention provides a magnetic resonance imaging method for dynamic contrast-enhanced imaging based on a three-dimensional pulse sequence of fast low angle shot FLASH. The method comprises the steps of: applying a FLASH imaging pulse sequence to an objected to be examined in a static magnetic field, wherein the FLASH imaging pulse sequence comprises radio frequency shot pulses a and fat inhibiting pulses b, and N radio frequency shot pulses a are comprised between two adjacent fat inhibiting pulses b; adjusting a fat inhibiting flip angle b with certain time of inversion T1 and time of scan delay TD to obtain the optimal fat inhibiting effect; and adjusting the time of inversion T1 and / or the time of scan delay TD to obtain the optimal fat inhibiting effect in a condition that the optimal fat inhibiting effect cannot be obtained by adjusting the fat inhibiting flip angle b. Compared with the prior art, the magnetic resonance imaging method provided by the invention has the advantages of good fat inhibiting effect and high imaging quality.

In a dynamic contrast temperature system including a thermocycling block and an organism zone multi-modules temperature applicator a method of spatiotemporal temperature-physiological optimizing includes modules structure arranging and modulating a module temperature action with a law, a range and a frequency providing a cooling phase and a heating phase of a “drop-shaped” form law so, that each two side by side disposed the modules form a temperature pair with a modulated binary temperature action gradient, and a modulation comparative phase provides a phase shift to a comparative phase of an independent periodic additional action process; and gradient-wave therapeutically optimized changing the modulation parameters in dependence on the changes of the organism physiological characteristics.

The invention discloses a display device and a driving method thereof. The display device comprises a side-entry backlight, a liquid crystal display panel at the light outgoing side of the backlight, and a light control part positioned between the backlight and the liquid crystal display panel. The side-entry backlight comprises a light guide plate and multiple light emitting diodes arranged on a side edge of the light guide plate. The light guide plate is divided into multiple first areas, and the brightness of each area is controlled by at least one light emitting diode. The light control part is divided into multiple second areas, and at least one second area is covered by one first area. The brightness of each first area and the light transmittance of each second area are controlled by a display frame needed by a relative area of the liquid crystal display panel. Through adoption of the side-entry backlight, the display device becomes ultrathin. Moreover, the brightness of each first area and the light transmittance of each second area covered by one corresponding first area are controlled on the basis of the needed display frame, so a high dynamic contrast can be realized. Therefore, the display device that is ultrathin and exhibits a high dynamic contrast is obtained.