21 results about "False positivity" patented technology

The invention provides a helicobacter pylori fluorescence image fine tuning detection method and device and a readable storage medium thereof, and belongs to the technical field of medical image processing and computer-aided diagnosis. The method aims at solving the problems that in the prior art, the false positive is high due to the fact that only a fluorescence signal is relied on, and a model is poor in generalization for different data environments. The method comprises the following steps: outputting a detection frame of a suspected target from a fluorescence image block through a detection module; determining a target analysis area containing a detection frame and a surrounding tissue area, and inputting the analysis area into a classification module to judge true and false positive; and when the classification result is confirmed to be wrong, only performing fine tuning training on a classifier in the classification module by utilizing target analysis area data corresponding to the error and combining a group of preset representative sample features. According to the method, the false positive rate is remarkably reduced by using surrounding organization information, and the generalization ability and scene adaptability of the model are improved through an efficient fine adjustment mechanism.

The utility model belongs to the technical field of reagent detection, and discloses a test paper clamping shell. The test paper clamping shell comprises a shell body, an observation window, a test tube fixing hole, a sealing piece and a tube breaking blade. According to the test paper clamping shell, in the sample adding link, a test tube cover does not need to be opened, a test tube only needs to be directly placed into the clamping shell through the test tube fixing hole, the sealing piece can seal a gap between the test tube and the test tube fixing hole, the tube breaking blade cuts the test tube in the test tube pressing process, and a reagent in the test tube flows into the reagent adding cavity; meanwhile, a transparent partition plate is arranged on the observation window in a sealed mode, it is guaranteed that the interior of the shell body of the test paper card shell is isolated from the outside in the sample adding operation process, and therefore it can be guaranteed that the whole chromatography process is not in contact with outside air, and the risk of outside aerosol pollution is greatly reduced through the design; the phenomenon that the detection result is false positive due to aerosol pollution is completely eradicated from the source, and the accuracy of the detection result is guaranteed.

A system and method are provided for evaluating a prediction model configured to predict occurrence of a clinical event in multiple patients during corresponding patient stays, where the prediction model outputs risk scores for the patients. The method includes identifying patient stays that include at least one risk score generated by the prediction model that crosses a predetermined risk threshold; providing notifications for risk scores that cross the risk threshold; determining a patient-level confusion matrix based on the notifications, where each patient stay contributes one patient data point to the patient-level confusion matrix; determining an event-level confusion matrix based on the notifications, where the event-level confusion matrix includes prediction lead time and notification limit, where each patient stay contributes one event data point to the event-level confusion matrix; calculating classification metrics for false positives and false negatives; and identifying errors in the predication model based on the classification metrics.

The application belongs to the technical field of molecular diagnosis, and particularly relates to a digital PCR kit and method for accurately detecting the copy number of a CAR gene of a CAR-T cell and a lentivirus vector. The application first realizes the absolute quantification of CAR, Rev and an internal reference gene RNase P in a single tube simultaneously, and has strong universality. Based on the principle of digital PCR, the absolute copy number is directly obtained without a standard curve, and the result is accurate and highly repeatable. The detection lower limit reaches 0.01%, and extremely low abundance CAR-T residues or microresidual diseases can be detected. Primers and probes are designed for the conservative regions of CD3zeta, Rev and RNase P, and no cross reaction is verified, so that false positives are effectively avoided. The sample only needs gDNA, and there is no requirement for cell activity, and the sample is compatible with freezing and transportation. The kit is premixed and optimized, the process is automated, and 4-5 hours are needed. The kit is suitable for the whole chain of CAR-T drug research and development, production process quality control, clinical patient monitoring and safety evaluation.

This invention provides a three-dimensional spatial organ image feature extraction system that reduces false positives. [Solution] A feature extraction method is developed to serve as the basis for classifying organ positives and false positives. Multiple organ cross-sectional layers of the same type of three-dimensional organ are extracted using MRI. An AI analysis system generates organ cross-sectional layers for each organ, and a specific organ marking image is generated. The organ cross-sectional layers from which the specific organ marking image was generated are imported into the image analysis unit. The centroid point of the specific organ marking image and the organ cross-sectional layer containing the specific organ marking image are imported into the feature extraction unit. The feature extraction unit calculates minimum distance data based on the centroid point and reference point, calculates area data based on the specific organ marking image, generates a layer number data set based on total layer number information, current layer number information, and image code information, and imports the distance data, area data, and layer number data set into the feature calculation unit to generate matching results. The post-processing unit selects whether to delete or retain the specific organ marking image based on the matching results.

The utility model provides a cross contamination prevention metal bath which comprises a metal bath body and a heating template which is arranged in the metal bath body and is provided with a centrifugal tube hole site upwards, and a hemispherical cover plate is hinged to the upper portion of the metal bath body. The hemispherical cover plate is provided with a centrifugal tube plug pressure applying assembly which penetrates through and extends to the upper part of the hemispherical cover plate. According to the cross contamination prevention metal bath, the sample pressing plate is additionally arranged on the metal bath, the sample pressing plate can firmly press a centrifugal tube cover plug through adjustment of the lead screw on the nut, and the situation that the cover plug bounces off due to the fact that steam pressure in a tube is increased is effectively prevented. Therefore, small molecule DNA / RNA fragments in the positive sample cannot be splashed to form aerosol due to the fact that the cover plug is bounced off, and other negative samples cannot be polluted, so that false positive results of negative sample detection results are avoided, the accuracy and reliability of DNA / RNA detection are greatly improved, it is ensured that the experimental results truly reflect sample conditions, and the accuracy and reliability of DNA / RNA detection are improved. And an accurate basis is provided for medical diagnosis.

The application discloses a Mendelian randomization analysis method for correcting sample overlap and pleiotropic bias, and is based on a joint correction framework of IVW, HDL and MR-PRESSO, in which pleiotropic abnormal SNPs are removed first, and then sample overlap bias is quantified and corrected, so that the problem that existing methods can only correct single bias is solved, synchronous and effective correction of sample overlap and pleiotropic compound bias is realized, the estimation accuracy can be ensured in a complex scene with a high sample overlap ratio and pleiotropy, meanwhile, the dependence of MR-APSS and other methods on the InSIDE assumption is abandoned, the problem that the CAUSE method is too conservative is avoided, the false positive rate can be controlled while maintaining high causal discovery sensitivity, the method can be directly packaged into a computer program, and is applied to epidemiological causal inference research of large-scale GWAS summary data, and is efficient in calculation and wide in applicability.

The application relates to the technical field of metabolomics analysis, and discloses an AI-assisted metabolomics difference analysis method, which comprises the following steps: performing data preprocessing on biological groups to obtain preprocessed data; identifying user input instructions, obtaining corresponding biological groups and output content categories based on the user input instructions; performing difference analysis on the preprocessed data corresponding to the biological groups through an AI analysis model to obtain difference analysis results and output content categories; and generating a complete analysis report according to the difference analysis results and the output content categories. Through the data preprocessing process, the application can separate and remove system variation (interfered by non-biological factors such as batch effect, instrument drift and sample collection time difference) from the data, highlight the real group difference, avoid false positive or false negative results, and ensure the accuracy of the analysis results when the AI performs difference analysis.

The utility model provides a sample adding and smearing device for a syphilis non-specific antibody detection test, relates to the technical field of medical instruments, and aims to solve the problems that the device is inconvenient to smear and completely spread samples on different reaction cards at the same time, and when the sample size is large, a long time difference exists between early-stage sample adding and later-stage sample adding, so that the time difference is large. The device comprises a suction tube and a sample adding tube, wherein the suction tube is arranged on the suction tube; a group of fixing blocks are slidably mounted at the outer end of the suction tube, a group of pistons are slidably mounted in the suction tube, and the fixing blocks at the outer end of the suction tube are inserted into limiting grooves in the top of the movable frame; according to the reaction card smearing device, samples on different reaction cards can be conveniently smeared at the same time and completely spread, the use efficiency of the device is effectively improved, the smearing plate can be conveniently and automatically fixed at the horizontal position, and the use effect of the device is further improved.

This invention discloses a method and system for constructing an AI-assisted diagnostic agent for pulmonary embolism based on ontology and knowledge graph, belonging to the fields of medical information systems and medical artificial intelligence technology. By integrating a pulmonary embolism-specific medical ontology, a clinically aligned knowledge graph, and thought chain reasoning, this invention leverages the hard constraints of ontology knowledge to achieve interpretability analysis of the entire process of AI-assisted diagnosis for pulmonary embolism, precise suppression of AI illusions specific to pulmonary embolism, end-to-end quality control, and closed-loop optimization. It is particularly suitable for rapid diagnosis of acute and critical pulmonary embolism, AI-assisted identification of pulmonary artery filling defects in CTPA images, thrombosis severity stratification, and emergency treatment decision tracing and regulatory compliance quality control scenarios. It can be adapted to the implementation, regulatory verification, and clinical optimization of various pulmonary embolism AI imaging diagnostic and emergency auxiliary diagnosis and treatment systems, specifically addressing core illusion problems in pulmonary embolism AI diagnosis such as false positive embolus identification and disordered risk stratification.

This invention discloses a hairpin-mediated isothermal amplification (HAMP) assay for nucleic acid detection. The method provides a rapid, efficient, and highly specific alternative to conventional PCR, demonstrating accurate detection without false positives or false negatives. It is optimized for resource-limited settings and applicable to a broad range of diagnostic targets.

The present application addresses the technical problem of reducing false negatives and false positives in nuclear medicine image diagnosis. The diagnostic assistance device of the embodiments has a collating section and a presuming section. The collating section collates information on the accumulation site of a diagnostic drug, i.e., first site information, obtained from nuclear medicine imaging of a subject, and information on the source site of exosomes including the diagnostic drug, i.e., second site information, collected from the subject. The presuming section presumes that a tumor exists at a site where the collated results are consistent between the first site information and the second site information.

The invention discloses a physical examination data analysis system based on artificial intelligence, which relates to the technical field of data analysis, comprises a classification module, an analysis module and a marking module, and is characterized in that classification rules are set, attribute features are obtained through first analysis, time features are obtained through second analysis, and first marking is carried out. Multi-dimensional heterogeneous physical examination data is mapped to a unified semantic space by using a classification rule, false negative and false positive are avoided, cross section and longitudinal fusion analysis is realized through a two-stage model of attribute features of the first analysis and time features of the second analysis, and the analysis accuracy is improved. The classification rule and the time sequence model can be updated in a closed-loop mode every time new physical examination data is received, manual retraining is not needed, the maintenance cost is close to zero, original fragmented physical examination data are converted into explainable, intervened and traceable health management decisions through classification, attribute, time and marking four-level assembly lines, and the management efficiency is improved. Five values of technology precision, clinical early screening, economy, efficient management, compliance and safety are realized.

The bronchoalveolar lavage fluid collecting device comprises a bottle body, three independent cavities are formed in the bottle body, each cavity is provided with an outlet, the bottle body is provided with a fluid inlet pipe and a negative pressure pipe, the fluid inlet pipe and the negative pressure pipe are communicated with the three cavities through connecting pipes respectively, and the connecting pipes are communicated with the three cavities. A switching mechanism for independently controlling the opening or closing of each chamber connecting pipe is arranged; the bronchoalveolar lavage device is simple in structure and reasonable in design, samples of different parts can be collected in the bronchoalveolar lavage process through the three independent cavities, collection bottles do not need to be frequently replaced, the risks of sample loss or mixing and pollution are avoided, and the false positive occurrence rate is reduced; the switching mechanism can realize rapid switching of the collection chamber, reduce the steps of disconnecting and reconnecting the pipeline, save the operation time, reduce the risk of complications caused by too long operation time of a patient, and improve the diagnosis accuracy and the overall safety.

A medical data and diagnostics management system for processing classified EGM datasets includes a server system that receives transmissions of classified EGM datasets, each corresponding to an arrhythmic episode detected by an IMD, and applies a machine-learning model to each classified EGM dataset stored in a database, thereby determining for each of the classified EGM datasets to which the model is applied a respective indicator of whether the IMD classification is a false positive or a true positive. The system is further configured to remove from the database one or more of the classified EGM data sets for which the respective IMD classification is identified using the machine-learning model as being a false positive, thereby creating a plurality of machine-adjudicated patient database records stored in the database. The system may also provide for display a selected one of the machine-adjudicated EGM datasets and / or facilitate reprograming the IMD.

This invention belongs to the field of biomedical detection technology, and relates to a semi-quantitative nano-selenium chromatography test strip for detecting T4, T3, or TSH, and its preparation method. The test strip is extremely sensitive to humidity; if exposed to a humid environment for more than 5 minutes during storage and transportation, the test strip will become damp, significantly affecting the chromatography process and leading to erroneous test results. The improved stepwise labeling and post-mixing process employed in this invention, through physical separation of competing steps, ensures the optimized labeling and functional purity of both the specific antibody and the blocking antibody, fundamentally eliminating false positives caused by defects in probe preparation. The prepared test strip exhibits no cross-reactivity, excellent specificity, accurate T3 index localization, superior stability, and a long shelf life, meeting the requirements for commercial storage and transportation.

A non-transitory computer-readable recording medium storing instructions causing a computer to execute: acquiring information on whether each of one or more first lesion detection regions is false positive, the one or more first lesion detection regions being input by a user with respect to a first analysis result and obtained by computer processing on a first medical image of a patient; acquiring a second analysis result including one or more second lesion detection regions that are obtained by computer processing on a second medical image of the patient; and displaying a false correspondence region in a different manner from a manner of displaying a non-false correspondence region. The false correspondence region corresponds to a first lesion detection region indicated as being false positive, and the non-false correspondence region corresponds to a first lesion detection region indicated as being not false positive, in the acquired information.

Provided are a method for detecting fetal chromosomal aneuploidies on the basis of false-positive data and false-negative (normal) data and a computer-readable recording medium having recorded thereon a program applied to perform same. According to this invention, prenatal diagnosis for fetal chromosomal aneuploidies can be performed in a non-invasive manner with excellent sensitivity and specificity.

The application discloses a heart recovery data-based electrocardio monitoring method, and relates to the technical field of electrocardio monitoring, solves the technical problem of high false positive rate of abnormal heart beat confirmation caused by lack of scene self-adaptive grading system, and introduces a signal quality index based on contact impedance and baseline drift variance, so that the system can identify invalid leads in real time and prompt the user to adjust, filters low-quality data from the source, avoids false analysis caused by poor contact, and improves the accuracy of waveform reconstruction by dynamically selecting the wavelet basis with the smallest error according to the recently confirmed QRS complex form, which is different from traditional fixed wavelet transform, and effectively identifies and eliminates artifacts caused by violent movement by combining cross-correlation analysis of acceleration signals and electrocardio signals, thereby reducing the false positive rate in a movement scene.