Kazuya Okamoto

Kazuya Okamoto
Kyoto University | Kyodai · Department of Medical Informatics

About

121
Publications
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1,103
Citations

Publications

Publications (121)
Article
Full-text available
In IWOCA 2019, Ruangwises and Itoh introduced stable noncrossing matchings , where participants of each side are aligned on each of two parallel lines, and no two matching edges are allowed to cross each other. They defined two stability notions, strongly stable noncrossing matching ( SSNM ) and weakly stable noncrossing matching ( WSNM ), dependin...
Conference Paper
Full-text available
Teamwork of the surgical team is an essential factor for building a safe medical environment in an operating room. However, no efficient approach has been discussed for objectively evaluating the intraoperative teamwork. The goal of this study is to analyze the teamwork from videos recorded in an operating room for better understanding the situatio...
Preprint
BACKGROUND Medical research for processing medical data is required to incorporate a governance system. Health data governance includes various elements. Among the values of governance, this study focuses on accountability and transparency. OBJECTIVE This paper proposes the system requirements for a communication platform to help medical researche...
Article
Full-text available
Background Pervasive games aim to create more fun and engaging experiences by mixing elements from the real world into the game world. Because they intermingle with players’ lives and naturally promote more casual gameplay, they could be a powerful strategy to stimulate physical activity among older adults. However, to use these games more effectiv...
Conference Paper
Conventional evaluation indices for upper limb function rehabilitation are based on the time to complete a task and the duration of movement. However , these metrics are insufficient to quantify motor performance attributes, such as smoothness of movement and presence of compensatory movements. This study aims to introduce a quantitative index for...
Article
Full-text available
Subjective, objective, assessment, and plan (SOAP) notes are widely used by physicians to document clinical reasoning in assessing, diagnosing, and treating patients. SOAP notes are also used in medical coding tasks for reimbursement of insurance claims. In Indonesia, medical coders who are independent from physicians assess SOAP notes to assign di...
Article
Full-text available
Subjective, objective, assessment, and plan (SOAP) notes are widely used by physicians to document clinical reasoning in assessing, diagnosing, and treating patients. SOAP notes are also used in medical coding tasks for reimbursement of insurance claims. In Indonesia, medical coders who are independent from physicians assess SOAP notes to assign di...
Article
The goal of this research was to design a solution to detect non-reported incidents, especially severe incidents. To achieve this goal, we proposed a method to process electronic medical records and automatically extract clinical notes describing severe incidents. To evaluate the proposed method, we implemented a system and used the system. The sys...
Article
Full-text available
Effective bed management is important for hospital management. Until now, bed allocation process is generally controlled by administrative staffs in centralized manner but it is not always effective. In the present study, we proposed and evaluated new method for bed allocation applying market mechanism via token. Evaluation was performed with newly...
Article
Full-text available
Objectives: Emergency Physicians utilize multiple patient information (PI) sources within Emergency Departments. Access to a centralized health record system is ideal but not always available to physicians. A technological gap exists in the context of PI sharing regarding patients’ representative and their in-situ involvement as an alternative PI s...
Conference Paper
In IWOCA 2019, Ruangwises and Itoh introduced stable noncrossing matchings, where participants of each side are aligned on each of two parallel lines, and no two matching edges are allowed to cross each other. They defined two stability notions, strongly stable noncrossing matching (SSNM) and weakly stable noncrossing matching (WSNM), depending on...
Article
Full-text available
Background: To parse free text medical notes into structured data such as disease names, drugs, procedures, and other important medical information first, it is necessary to detect medical entities. It is important for an Electronic Medical Record (EMR) to have structured data with semantic interoperability to serve as a seamless communication plat...
Preprint
In IWOCA 2019, Ruangwises and Itoh introduced stable noncrossing matchings, where participants of each side are aligned on each of two parallel lines, and no two matching edges are allowed to cross each other. They defined two stability notions, strongly stable noncrossing matching (SSNM) and weakly stable noncrossing matching (WSNM), depending on...
Article
Full-text available
The goal of this research was to design a solution to detect non-reported incidents, especially severe incidents. To achieve this goal, we proposed a method to process electronic medical records and automatically extract clinical notes describing severe incidents. To evaluate the proposed method, we implemented a system and used the system. The sys...
Preprint
Full-text available
The archetype-based approach has now been adopted by the major EHR interoperability standards. Soon, due to an increase in EHR adoption, more health data will be created and frequently accessed. Previous works show that conventional persistence mechanisms such as Relational and XML databases have scalability issues when storing and querying archety...
Conference Paper
Longitudinal analyses has been a long-time interest for clinical physicians. These analyses provide many benefits for them, such as insight on the medication strategy over different period of time. With the development of clinical research, new medication is released to provide better treatment outcomes. In this paper, we assess the medication stra...
Preprint
BACKGROUND Pervasive games aim to create more fun and engaging experiences by mixing elements from the real world into the game world. Because they intermingle with players’ lives and naturally promote more casual gameplay, they could be a powerful strategy to stimulate physical activity among older adults. However, to use these games more effectiv...
Conference Paper
Full-text available
In this paper, we present an agent-based completion that cooperates with a physician to optimize parameter-text pairs collection from a medical note. Currently, in hospitals, there is a medical coding process, which collects certain parameter-text pairs from the medical note's narrative text. The process starts with categorizing the text into certa...
Conference Paper
Full-text available
Pervasive games incorporate elements from the real world into their gameplay, creating more engaging experiences that can be used to stimulate positive behaviour. In this paper, we describe the evaluation of a pervasive game that used social interaction as a design element to promote physical activity among older adults. We used two variations of t...
Article
The amount of text of electronic medical records and its changes over time are not clear. In designing an electronic medical records system, prediction of the amount of text is important. We analyzed the number of characters described in the electronic medical records. As a result, it became clear that the annual text quantity of electronic medical...
Article
Nephrosis is disease characterized by abnormal protein loss from impaired kidney. We constructed early prediction model using machine learning from clinical time series data, that can predict onset of nephrosis for more than one month. Long short-term memory capable of recognizing temporal sequential data patterns, was adopted as early prediction m...
Article
Full-text available
Redesigning Electronic Medical Record (EMR) systems is needed to improve their usefulness and usability. For user-centered redesign, designers should consider which EMR features are the most important to the users. However, prioritizing the EMR features is complicated because: (i) EMR systems involve multiple users with different, and sometimes con...
Article
Full-text available
In the stable marriage problem, we are given a set of men, a set of women, and each person’s preference list. Our task is to find a stable matching, that is, a matching admitting no unmatched (man, woman)-pair each of which improves the situation by being matched together. It is known that any instance admits at least one stable matching. In this p...
Article
Full-text available
Background: The novel genre of pervasive games, which aim to create more fun and engaging experiences by promoting deeper immersion, could be a powerful strategy to stimulate physical activity among older adults. To use these games more effectively, it is necessary to understand how different design elements affect player behavior. Objective: Th...
Article
Full-text available
Background: Redesigning electronic medical record (EMR) systems is needed to improve their usability and usefulness. Similar to other artifacts, EMR systems can evolve with time and exhibit situated roles. Situated roles refer to the ways in which a system is appropriated by its users, that is, the unintended ways the users engage with, relate to,...
Article
Full-text available
Introduction Promoting active lifestyles among older adults can bring drastic benefits for their quality of life. The innovative mechanics of pervasive games – that mix real and virtual worlds – can further engage and motivate elderly people into that goal. Using social interaction as a study case, we designed and evaluated the feasibility of a per...
Chapter
We present the design process and evaluation of a pervasive, location-based mobile game created to act as an experiment system and allow evaluation of how different design elements can influence player behaviour, using social interaction as a study case. A feasibility study with a group of community dwelling elderly volunteers from the city of Kyot...
Article
Full-text available
Woman-centered antenatal care necessitates Electronic Medical Record (EMR) systems that respect women’s preferences. However, women’s preferences regarding EMR systems in antenatal care remain unknown. This work aims to understand the EMR-related experiences that pregnant Japanese women want. First, we conducted a field-based observational study at...
Article
Full-text available
Background: There are limited data on the prevalence and burden of severe eosinophilic asthma (SEA) both in Japan and globally. This study aimed to assess the prevalence and burden of SEA in Japan. Methods: This study was a retrospective, observational cohort analysis using health records or health insurance claims from patients with severe asth...
Conference Paper
Pervasive electronic games use innovative mechanics to create immersion and promote user engagement, thus being a potentially powerful tool to promote active lifestyles among the elderly. We describe a pervasive game developed to test how design elements can affect older adults’ levels of physical activity, using social interaction as case study. T...
Article
Aim: The aim of this study was to investigate epidemiological and clinical aspects of severe postpartum haemorrhage (PPH) in Japan. Methods: We used national health insurance claims from 2011 to 2014 provided by the Ministry of Health, Labour and Welfare. The data included randomly selected claims that covered 10% of all inpatients in October, a so...
Article
High accessibility of Electronic Health Record systems can increase usability but creates simultaneously patients' anxieties about privacy issues. In order to reduce the privacy concerns, we focused on control and awareness, and designed an approach that can provide availability of patient's clinical data to doctors in two scenarios; (S1) direct co...
Article
Full-text available
Electronic Medical Records (EMR)s are intrinsic to modern-day clinics. Understanding the roles, i.e., the unintended functions of EMR systems in their context of use can guide the design of EMR systems and clinics to better integrate them. To understand the roles of EMR systems in antenatal care check-ups, we conducted a field-based observational s...
Article
Full-text available
Objective: For chronic diseases, medical history reconstruction is essential for retrospective database analyses. One important aspect is determining which prescriptions belong to the same episode. However, a standard framework for this task is still lacking, particularly for multitherapy datasets. This paper presents a medication episode construc...
Article
Full-text available
Background We aimed to develop an adaptable prognosis prediction model that could be applied at any time point during the treatment course for patients with cancer receiving chemotherapy, by applying time-series real-world big data. Methods Between April 2004 and September 2014, 4,997 patients with cancer who had received systemic chemotherapy wer...
Data
Comparison of the prediction performance between time-dependent Cox regression models and logistic regression models. AUC, area under the curve; LR, logistic regression. (XLSX)
Data
Patient characteristics of the validation cohorts at the Kyoto Mitsubishi, Kyoto Min-iren Chuo hospitals and the J-ProVal study. J-ProVal study, Japan prognostic assessment tools validation study. (XLSX)
Data
Top 10 prediction models for the occurrence of death events within 1–3 months. ALB, albumin; ALP, alkaline phosphatise; Ca, calcium; Cl, chloride; CRP, C-reactive protein; K, potassium; LDH, lactate dehydrogenase; MCH, mean corpuscular hemoglobin; MCHC, mean corpuscular hemoglobin concentration; MCV, mean corpuscular volume; Na, sodium; PPV, positi...
Data
External validation of albumin, lactate dehydrogenase, and neutrophil models for prediction of death events within 1–6 months. PPV, positive predictive value; NPV, negative predictive value. (XLSX)
Data
Comparison of prediction performance among 2-item, 3-item and 4-item prognostic models in the current internal and external validation cohorts. To save time, we used representative prognostic items to develop the 4-item prognostic models and selected albumin (Alb), neutrophil (Neu), lactate dehydrogenase (LDH), and blood urine nitrogen (BUN) progno...
Data
Top 10 prediction models for the occurrence of death events within 4–6 months. ALB, albumin; ALP, alkaline phosphatise; Ca, calcium; Cl, chloride; CRP, C-reactive protein; K, potassium; LDH, lactate dehydrogenase; MCH, mean corpuscular hemoglobin; MCHC, mean corpuscular hemoglobin concentration; MCV, mean corpuscular volume; Na, sodium; PPV, positi...
Conference Paper
Full-text available
This paper describes the design of a pervasive game that uses social interaction aiming at increasing daily activity among older adults. We propose an experiment to analyze the game design with respect to how social interaction affects players' daily activity levels. In order to allow comparison between test and control groups, different variations...
Article
Full-text available
openEHR is a widely used EHR specification. Given its technology-independent nature, different approaches for implementing openEHR data repositories exist. Public openEHR datasets are needed to conduct benchmark analyses over different implementations. To address their current unavailability, we propose a method for generating openEHR test datasets...
Article
Many isolated EHRs in Japan hinders the availability of patients' clinical data who need treatment in a region outside the scope of their local EHR. We propose a timelier approach that increases availability of patient clinical data to unknown doctors and has the patient and their representative involved; they can grant access to doctors who are an...
Article
Background: Lung cancer is the leading cause of cancer death and is closely linked to tobacco smoking. Genetic polymorphisms in genes that encode enzymes involved in metabolizing tobacco carcinogens could affect an individual's risk for lung cancer. While polymorphism of UDP-glucuronosyltransferase1A1 (UGT1A1) is involved in detoxification of benz...
Article
For preventing mistakes and guaranteeing quality, Clinical Decision Support System (CDSS) is expected to support decision-making of healthcare professionals. Until now, there had been many studies of CDSS based on rule-based production system. However practical use of CDSS had been limited because of the complexity of medical care. On the other han...
Conference Paper
With the growing attention to evidence-based medical guideline development, longitudinal analysis of Electronic Medical Records (EMR) has become a good tool for providing insight into and new knowledge on the existing therapy. For chronic diseases, longitudinal analysis of medication history plays a key role in reaching this goal. However, raw medi...
Conference Paper
A context aware nursing support system to push right information to the right person at the right moment is the key to increase clinical safety under a computerized hospital. We prototyped a system which obtains context from positions of nurses and list of expected clinical procedures. A WoZ test showed that the proposed approach has potential to d...
Conference Paper
Recently, in vivo visualization of the cochlea and the smaller structures inside of it has been achieved by optical coherence tomography (OCT). This makes it possible to use OCT imaging for diagnosis of diseases such as Meniere's disease through measuring the degree of endolymphatic hydrops. To this end, we present a novel method for 3D segmentatio...
Article
Full-text available
Endolymphatic hydrops is a disorder in which an excessive amount of endolymph fluid causes an increase in the pressure of the endolymphatic system of the inner ear. In cochlea, endolymphatic hydrops can cause stretching in the scala media, a tubular construction that, along with two other similar structures, the scala vestibuli and scala tympani, r...
Article
Background: Rheumatoid arthritis (RA) is a progressive inflammatory disease that causes damage to multiple joints, decline in functional status, and premature mortality. Thus, effective and frequent objective assessments are necessary. Then, we developed a self-assessment system for RA patients based on a smartphone application. Objective: The p...
Article
Although the most of the modern medical instruments has been computerized, they are not connected to hospital information systems. As a result, clinical recording still heavily relied on manpower. In this research, we attempt to connect medical instruments to a hospital information system. Once it is connected, detailed medical record can be obtain...
Article
Issues related to ensuring patient privacy and data ownership in clinical repositories prevent the growth of translational research. Previous studies have used an aggregator agent to obscure clinical repositories from the data user, and to ensure the privacy of output using statistical disclosure control. However, there remain several issues that m...
Article
In Japan, most of all the university and advanced hospitals have implemented both electronic order entry systems and electronic charting. In addition, all medical records are subjected to inspector audit for quality assurance. The record of informed consent (IC) is very important as this provides evidence of consent from the patient or patient's fa...
Article
Full-text available
Learning for surgical procedures has been changing from experimental learning or textural learning to skill learning using virtual reality (VR) simulation. VR simulation is very useful to learn for surgical procedures but it is very difficult to make VR simulation environment. Therefore a simulation library which named MVL (Medical Virtual Reality...
Article
In this paper, the system in consideration of the characteristic of the sensor information gathering on the personal mobile terminal was proposed introducing XML notation form. Then, we describe the composition of the gait outline monitoring system using the acceleration sensor and GPS information that assumes the application to the healthcare. We...
Article
The authors produced a dual task (DT) that provided a dynamic balance task and a cognitive task in a game system using motion sensors and virtual images. There had been no DT where a cognitive task needs a dynamic balance task that requires full-body motions. We developed and evaluated a game system to assess the performance of the DT. The DT was t...