Phase recognition in SEM-EDX chemical maps using positive matrix factorization.

Images from scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX) are informative and useful to understand the chemical composition and mixing state of solid materials. Positive matrix factorization (PMF) is a multivariate factor analysis technique that has been used in many applications, and the method is here applied to identify factors that can describe common features between elemental SEM-EDX maps. The procedures of converting both graphics and digital images to PMF input files are introduced, and the PMF analysis is exemplified with an open-access PMF program. A case study of oxygen carrier materials from oxygen carrier aided combustion is presented, and the results show that PMF successfully groups elements into factors, and the maps of these factors are visualized. The produced images provide further information on ash interactions and composition of distinct chemical layers. The method can handle all types of chemical maps and the method is not limited solely to SEM-EDX although these images have been used as an example. The main characteristics of the method are:•Adapting graphics and digital images ready for PMF analysis.•Conversion between 1-D and 2-D datasets allows visualization of common chemical maps of elements grouped in factors.•Handles all types of chemical mappings and large data sets.

Relating person-centredness to quality-of-life assessments and patient-reported outcomes in healthcare: A critical theoretical discussion.

Engagement with the historical and theoretical underpinnings of measuring quality of life (QoL) and patient-reported outcomes (PROs) in healthcare is important. Ideas and values that shape such practices-and in the endgame, people's lives-might otherwise remain unexamined, be taken for granted or even essentialized. Our aim is to explicate and theoretically discuss the philosophical tenets underlying the practices of QoL assessment and PRO measurement in relation to the notion of person-centredness. First, we engage with the late-modern history of the concept of QoL and the act of assessing and measuring it. Working with the historical method of genealogy, we describe the development of both QoL assessments and PRO measures (PROMs) within healthcare by accounting for the contextual conditions for their possibility. In this way, the historical and philosophical underpinnings of these measurement practices are highlighted. We move on to analyse theoretical and philosophical underpinnings regarding the use of PROMs and QoL assessments in clinical practice, as demonstrated in review studies thereof. Finally, we offer a critical analysis regarding the state of theory in the literature and conclude that, although improved person-centredness is an implied driver of QoL assessments and PROMs in clinical practice, enhanced theoretical underpinning of the development of QoL assessments is called for.

Centredness in health care: A systematic overview of reviews.

INTRODUCTION: The introduction of effective, evidence-based approaches to centredness in health care is hindered by the fact that research results are not easily accessible. This is partly due to the large volume of publications available and because the field is closely linked to and in some ways encompasses adjoining fields of research, for example, shared decision making and narrative medicine. In an attempt to survey the field of centredness in health care, a systematic overview of reviews was conducted with the purpose of illuminating how centredness in health care is presented in current reviews. METHODS: Searches for relevant reviews were conducted in the databases PubMed, Scopus, Cinahl, PsychINFO, Web of Science and EMBASE using terms connected to centredness in health care. Filters specific to review studies of all types and for inclusion of only English language results as well as a time frame of January 2017-December 2018, were applied. RESULTS: The search strategy identified 3697 unique reviews, of which 31 were included in the study. The synthesis of the results from the 31 reviews identified three interrelated main themes: Attributes of centredness (what centredness is), Translation from theory into practice (how centredness is done) and Evaluation of effects (possible ways of measuring effects of centredness). Three main attributes of centeredness found were: being unique, being heard and shared responsibility. Aspects involved in translating theory into practice were sufficient prerequisites, strategies for action and tools used in safeguarding practice. Further, a variety and breadth of measures of effects were found in the included reviews. CONCLUSIONS: Our synthesis demonstrates that current synthesized research literature on centredness in health care is broad, as it focuses both on explorations of the conceptual basis and the practice, as well as measures of effects. This study provides an understanding of the commonalities identified in the reviews on centredness in healthcare overall, ranging from theory to practice and from practice to evaluation. PATIENT OR PUBLIC CONTRIBUTION: Patient representatives were involved during the initiation of the project and in decisions about its focus, although no patient or public representatives made direct contributions to the review process.

Vision-Based Tracking of Surgical Motion During Live Open-Heart Surgery.

BACKGROUND: Motion tracking during live surgeries may be used to assess surgeons' intra-operative performance, provide feedback, and predict outcome. Current assessment protocols rely on human observations, controlled laboratory settings, or tracking technologies not suitable for live operating theatres. In this study, a novel method for motion tracking of live open-heart surgery was developed, and evaluated. MATERIALS AND METHODS: Three-D-printed 'tracking die' with miniature markers were fitted to DeBakey forceps. The surgical field was recorded with a video camera mounted above the operating table. Software was developed for tracking the die from the recordings. The system was tested on five open-heart procedures. Surgeons were asked to report subjective system related concerns during live surgery and assess the weight of the die on blind test. The accuracy of the system was evaluated against ground truth generated by a robot. RESULTS: The 3D-printed die weighed 6 g and tolerated sterilization with hydrogen peroxide, which added approximately 13% to the mass of the forceps. Surgeons sensed a shift in the balance of the instrument but could on blind test not correctly verify changes in weight. When two or more markers were detected, the 3D position estimate was on average within 2-3 mm, and 1.1-2.6 degrees from ground truth. Computational time was 30-50 ms per frame on a standard laptop. CONCLUSIONS: The vision-based motion tracking system was applicable for live surgeries with negligible inconvenience to the surgeons. Motion data was extracted with acceptable accuracy and speed at low computational cost.

The Impact of Preoperative Patient Anxiety on Postoperative Anxiety and Quality of Recovery After Orthopaedic Surgery.

PURPOSE: To study how preoperative anxiety affects postoperative recovery in orthopaedic surgery based on two specific issues: does preoperative anxiety affect postoperative anxiety, pain, and nausea in the postanesthesia care unit (PACU) and does preoperative anxiety affect the quality of recovery. DESIGN: This was a nonexperimental quantitative observational study. METHODS: Patients (N = 37) were included through consecutive selection. Anxiety, pain, and nausea were measured preoperatively, 30 minutes after arrival at PACU and before discharge from PACU. Three days after discharge, participants completed the Quality of Recovery Questionnaire by telephone. FINDINGS: There was a significant correlation between preoperative anxiety and anxiety in PACU as well as anxiety, sadness, and depression 3 days after discharge from PACU. CONCLUSIONS: Patients who experience preoperative anxiety also experience anxiety in PACU. The quality of recovery 3 days after surgery is also affected by preoperative anxiety. Patients experience continued anxiety as well as sadness and depression.