Marı́a J. Lado

Universidade de Vigo

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Arturo J. Méndez

Kantonsspital Aarau

Xosé A. Vila

Universidade de Vigo

Pablo G. Tahoces

Universidade de Santiago de Compostela

Leandro Rodrı́guez-Liñares

Universidade de Vigo

Miguel Souto

University of Minho

J Vidal

Complejo Hospitalario de Pontevedra

Pedro Cuesta

Universidade de Vigo

Emilio García‐Roselló

Universidade de Vigo

Manuel Pérez Cota

Universidade de Vigo

Jacinto G. Dacosta

Universidade de Vigo

Cooperative Institutions

Universidade de Vigo

Universidade de Santiago de Compostela

Complejo Hospitalario Universitario de Santiago

Complexo Hospitalario Universitario A Coruña

University of Hawaiʻi at Mānoa

Servicio Gallego de Salud

Center for Research in Molecular Medicine and Chronic Diseases

Instituto de Investigación Sanitaria de Santiago

University of Hawaii System

Informa (Italy)

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

An evaluation tool for wave delineation in ECG processing: Wxw

2022 17th Iberian Conference on Information Systems and Technologies (CISTI) (2018)

Víctor Mondelo Marı́a J. Lado Arturo J. Méndez Xosé A. Vila Leandro Rodrı́guez-Liñares

Evaluating research results is not always an easy task. Although it is interesting to compare personal achievements against similar works from other researchers, in many ocassions it is hard to replicate exactly the same conditions, because papers do not reflect all the variables of the context. To mitigate this problem, some standard systems have been created for researchers to unify this step in their works. One example of this is the bxb (beat-by-beat) tool from PhysioNet's PhysioToolkit, developed to compare results in beat detection. Delineation is an important part inside Electrocardiogram (ECG) diagnostic systems, because it is necessary to properly identify waves inside the beats. Besides the position of each wave into the signal, onset and offset positions for a wave are also needed. The more precise these positions are, the better the diagnostic is. But unlike the case of the beat detection, there are no generic tools for delineation evaluation, and papers that deepen in this subject in most cases do not explain clearly how they get their results, or directly asked an expert to supervise the outcome of their systems. Because of this, the main purpose of the present work is to introduce an evaluation tool, named wxw, to assess wave delineation for a computer-aided ECG diagnostic system.

Beat (acoustics)

Replicate

10.23919/cisti.2018.8399420

Cite

Citations (1)

Analytic wavelets applied for the detection of microcalcifications. A tool for digital mammography

European Signal Processing Conference (2004)

Silvio Montrésor Marı́a J. Lado Pablo G. Tahoces Miguel Souto J Vidal

Computerized methods to detect microcalcifications in digital mammograms are being developed. Parallel to this, Wavelet Transform (WT) has become an important tool in the field of signals and images processing. This paper is devoted to the realisation and evaluation of an Analytic Wavelet Transform (AWT) based algorithm for the detection of microcalcifications. AWT has proved to be an efficient tool to detect singularities in real signals. The presented algorithm exploit the flexibility of the transform to reach any resolution at any spatial frequency. To evaluate the numerical results, Receiver Operating Characteristic (ROC) curves are calculated for several sets of parameters. Results are compared with those obtained with a previously published algorithm using a Discrete Wavelet Transform (DWT).

Multiresolution analysis

Second-generation wavelet transform

Stationary wavelet transform

10.5281/zenodo.38358

Cite

Citations (3)

Nonparametric estimation of conditional ROC curves: Application to discrimination tasks in computerized detection of early breast cancer

Computational Statistics & Data Analysis (2007)

Ignacio López‐de‐Ullibarri Ricardo Cao Carmén Cadarso-Suárez Marı́a J. Lado

10.1016/j.csda.2007.09.013

Cite

Citations (20)

An approach to focus the educational needs while encapsulating a proprietary environment in a reusable component library

International Symposium on Computers in Education (2006)

Markus Stefan Aulkemeier Emilio García‐Roselló Marı́a J. Lado Arturo J. Méndez Jacinto G. Dacosta

Component (thermodynamics)

Source

Cite

Citations (0)

ECGDT: a graphical software tool for ECG diagnosis

Multimedia Tools and Applications (2023)

Víctor Mondelo Marı́a J. Lado Arturo J. Méndez

Abstract While cardiovascular diseases are the leading causes of death in developed countries, detection of cardiac abnormalities can reduce mortality rates, through early and accurate diagnosis. One of the main assets used to help in the diagnosis process is the electrocardiogram (ECG). A free software tool for electrocardiogram analysis and diagnosis is presented. The tool, named ECGDT, allows: (1) to detect beats present on the ECG, both in single and multi-channel levels, (2) to identify beat waves, and (3) to diagnose different cardiac abnormalities. System evaluation was performed in two ways: (1) diagnostic capabilities were tested with Receiver Operating Characteristic (ROC) analysis, and (2) Graphical Software Interface (GUI) aspects, such as attraction, efficiency, or novelty, were evaluated employing User Experience Questionnaire (UEQ) scores. For disease diagnosis, the mean Area Under the ROC Curve (AUC) was 0.821. The system was also capable of detecting 100% of several cardiac abnormalities, such as bradycardia or tachycardia. Related to the GUI, all usability estimators scored values ranged between 2.208 and 2.750 (overall positive evaluations are obtained for values over 0.8). ECGDT could serve as an aid in the diagnosis of different medical abnormalities. In addition, the suitability of the developed interface has been proven.

Graphical user interface

Software tool

10.1007/s11042-023-17101-2

Cite

Citations (0)

Evidence Based Recommendations for Designing Heart Rate Variability Studies

Journal of Medical Systems (2019)

Xosé A. Vila Marı́a J. Lado Pedro Cuesta

Supine position

Sitting

Body position

Coefficient of variation

10.1007/s10916-019-1437-8

Cite

Citations (16)

Influence of visual elicitation on emotion regulation: An investigation employing heart rate variability

Journal of Integrative Neuroscience (2017)

Marı́a J. Lado Pedro Cuesta Alejandro García-Caballero Xosé A. Vila

Several works studied the elicitation of emotions through the exposure of individuals to relevant stimuli, using spectral analysis of Heart Rate Variability (HRV) when people are subject to emotional elicitation. If correlation exists between HRV and emotional responses, spectral analysis can be used to study emotion regulation under external stimuli. In this work, we studied the relationship between visual elicitation and emotion regulation, employing HRV. Images (with pleasant, unpleasant and neutral emotional content) were selected from the IAPS (International Affective Picture System) dataset. Ninety-eight participants were enrolled, and subject to view all images, displayed in random order for each participant. Heart rate was recorded during the experiment, and HRV analysis was performed. Spectral values were studied for the different images. The presentation order of images was relevant, mainly when unpleasant images were viewed in first place; this significantly affects HRV values. Spectral values were higher for men, being this difference stronger when pleasant pictures were displayed. Age and gender dependences of spectral indexes were found. The influence of visual elicitation, with different emotional contents, over HRV, was assessed. Results indicate that HRV parameters are affected when individuals are subject to external, emotional-based stimuli.

10.3233/jin-170014

Cite

Citations (2)

Automatic detection of breast border and nipple in digital mammograms

Computer Methods and Programs in Biomedicine (1996)

Arturo J. Méndez Pablo G. Tahoces Marı́a J. Lado Miguel Souto JoséL. Correa

Position (finance)

Breast tissue

10.1016/0169-2607(96)01724-5

Cite

Citations (136)

Effects of JPEG2000 Data Compression on an Automated System for Detecting Clustered Microcalcifications in Digital Mammograms

IEEE Transactions on Information Technology in Biomedicine (2006)

Manuel G. Penedo Marı́a J. Lado Pablo G. Tahoces Miguel Souto J Vidal

The functionalities of the JPEG2000 standard have led to its incorporation into digital imaging and communications in medicine (DICOM), which makes this compression method available for medical systems. In this study, we evaluated the compression of mammographic images with JPEG2000 (16:1, 20:1, 40:1, 60.4:1, 80:1, and 106:1) for applications with a computer-aided detection (CAD) system for clusters of microcalcifications. Jackknife free-response receiver operating characteristic (JAFROC) analysis indicated that differences in the detection of clusters of microcalcifications were not statistically significant for uncompressed versus 16:1 (T=-0.7780;p=0.4370),20:1(T=1.0361;p=0.3007), and 40:1 (T=1.6966;p=0.0904); and statistically significant for uncompressed versus 60.4:1 (T=5.8883;p<0.008), 80:1 (T=7.8414;p<0.008), and 106:1 (T=17.5034;p=<0.008). Although there is a small difference in peak signal-to-noise ratio (PSNR) between compression ratios, the true-positive (TP) and false-positive (FP) rates, and the free-response receiver operating characteristic (FROC), figure of merit values considerably decreased from a 60:1 compression ratio. The performance of the CAD system is significantly reduced when using images compressed at ratios greater than 40:1 with JPEG2000 compared to uncompressed images. Mammographic images compressed up to 20:1 provide a percentage of correct detections by our CAD system similar to uncompressed images, regardless of the characteristics of the cluster. Further investigation is required to determine how JPEG2000 affects the detectability of clusters of microcalcifications as a function of their characteristics

JPEG 2000

Microcalcification

Data compression ratio

10.1109/titb.2005.864381

Cite

Citations (15)

HEART RATE VARIABILITY IN SIESTA POLYSOMNOGRAMS - A Preliminary Study

Xosé A. Vila Arturo J. Méndez Abraham Otero Leandro Rodrı́guez-Liñares Marı́a J. Lado

SIESTA (computer program)

10.5220/0003735703340337

Cite

Citations (0)