Browsing by Author "Dayananda, NWN"

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item: Conference-Abstract
Automated whole slide imaging for conventional optical microscopes
Mallawaarachchi, s; Wimalana, KWSS; Wimalana, AS; Premalal, GVA; Samarasinghe, S; Dayananda, NWN
Optical microscopes are used to observe magnified views of specimens that are infinitesimal to be directly observed by the human eye. They are commonly used in histopathology, where urgent reports are often crucial in decision-making. However, dependance on microscope technicians has several identified drawbacks, such as, the field of view being only available to the technician and continuous observation of slides inducing human errors. Furthermore, prolonged use of microscopes can lead to severe eye injuries. To address these issues, Whole Slide Imaging (WSI) microscopes, capable of automatically digitizing slides, are available in the market with a high price tag. However, these systems do not provide the user with the ability to change lenses and it is well known that some users have specific brand preferences in microscope lenses and systems. As a solution, this paper presents a method to enhance the functionality of a conventional optical microscope into a WSI microscope by motorizing the navigator and the fine-tune knob. An eyepiece camera is used to obtain photographs synchronously at predefined positions. The obtained images are then registered and stitched to generate a WSI, directly comparable with the output from the microscope. These images have various applications, such as, teaching, collaborative decision making and computer-aided-diagnostics.
item: Conference-Abstract
A Concept to increase the sensitivity of staphylococcus aureus detecting sensor in skin and wounds to prevent healthcare associated infections
(Faculty of Medicine, University of Moratuwa, 2024) Chandrarathna, HMPS; Samarasinghe, JA; Vimalaraj, A; Jayasinghe, DM.DS; Dayananda, NWN; Senanayake, S
Healthcare-associated infections (HAIs) are infections acquired by patients within healthcare facility stays, not present upon admission. HAIs annually impact millions of patients worldwide, leading to preventable illnesses, deaths, increased antibiotic resistance, prolonged hospital stays, and higher healthcare costs. Staphylococcus aureus (S. aureus) is a leading cause of HAIs, posing life-threatening risks. Microorganisms challenge efforts to maintain sterility during surgical procedures and on patient skin surfaces, despite stringent aseptic protocols. Even with standard precautions, contamination by HAIs through patients or healthcare personnel remains a serious threat. To address these challenges, leveraging medical technological advancements for detecting invading microorganisms, such as sensor systems, could enhance infection control measures during surgical procedures and patient care, ensuring safer healthcare environments.
item: Thesis-Full-text
Development of organ stiffness models for haptic feedback in laparoscopic surgery simulation
Kannangara, SM; Dayananda, NWN; Kumarage, S
Laparoscopic surgery is the most common Minimally Invasive Surgery (MIS) performed routinely for certain procedures such as appendectomy and Cholecystectomy. Laparoscopic surgical procedures are very complex compared to open surgeries and require a higher level of experience and expertise. A comprehensive training session on surgical simulator handling for trainee surgeons is highly recommended before the hands-on training in a real surgery. Comprehensive surgery simulators such as physical phantoms which are available for training are expensive and not readily available in many health care centers around the world. VR simulators have a great potential to revalorize the training paradigm of surgical interns. The haptic feedback plays as equally as visual feedback to provide a realistic environment to trainees. Realistic organ-force model is a key requirement of a VR simulator to experience real-time tool-tissue interaction forces. However, modeling real tissue properties has not been achieved due to several limitations such as the inaccessibility to in-vivo tissue properties, the complex behavior of biological tissues and anatomical variability. We have adopted an alternative approach to incorporate force feedback to VR simulators. The abdomen organ models (liver, gallbladder, stomach, bone, and vessel) were generated using the color Cryosection dataset of the Visible Human Project. A novel method was applied to render forces by fine-tuning the stiffness of organ model and integrating the three force ranges: soft, mild/firm and hard into organ models using feedback received from expert surgeons. The proposed system provides the interaction forces through a haptic device with six Degrees of Freedom (DoF) position sensing and three DOF force feedback. The simulated organ models were evaluated by two experienced surgeons. The proposed haptic models were mostly in harmony with their experience in real-world tool-tissue interaction and the overall accuracy of identifying the correct organ property was more than 68%. The organ models were also tested with senior registrars. The results showed a considerable improvement amounting to more than 34% chances of selecting the correct organ property after training.
item: Conference-Abstract
Digitalizing the pregnancy record
(Faculty of Medicine, University of Moratuwa, 2024) Herath, HMSN; Hasanga, PKDT; Haneeka, MHF; Hettiarachchi, BRNR; Hewage, TK; Dayananda, NWN; Warnakula, P; Kottahachhi, J; Peries, WANN; Talagala, I; Samarasinghe, T; Fernando, NS; Pasqual, D; Chandran, T; Shajahan, Z
Pregnancy requires extensive medical care due to various physical and psychological changes, making thorough antenatal care and record-keeping essential for the health of both mother and fetus. To overcome the inefficiencies, inaccessibility, and lack of real-time monitoring in paper-based systems, digitalizing pregnancy records can greatly enhance the quality and efficiency of antenatal care.
item: Conference-Extended-Abstract
Disease detection system from heart sounds
(2011) Liyanaarachchi, MR; Muthatif, FA; Perera, KIS; Selvarathnam, M; Dayananda, NWN
This paper presents a methodology to diagnose some heart diseases which can be identified using heart sounds. As the first stage, audio files in . wav format are acquired using an electronic stethoscope and entered to a database with patient symptoms. Prominent features and statistical parameters needed for disease detection are extracted from the heart sound samples using some algorithm. Patient's heart sound fde and symptoms are given as inputs to the developed software for analysis to find out the diseases.
item: Conference-Full-text
Mobile based wound measurement
(2015-07-06) Hettiarachchi, NDJ; Mahindaratne, RBH; Mendis, GDC; Nanayakkara, HT; Nanayakkara, ND; Dayananda, NWN
This paper proposes a portable wound area measurement method based on the segmentation of digital images. Its objective is to provide a practical, fast and non-invasive technique for medical staff to monitor the healing process of chronic wounds. Segmentation is based on active contour models which identifies the wound border irrespective of coloration and shape. The initial segmentation can also be modified by the user, providing higher control and accuracy. Area measurements are further normalized to remove effects of camera distance and angle. The application has been implemented for the Android platform version 2.2 with a prototype model running on Samsung Galaxy Tab. The results to evaluate the efficacy of the application have been encouraging with an accuracy level of 90%
item: Conference-Abstract
Mobile based wound measurement
(2014-06-25) Hettiarachchi, NDJ; Mahindaratne, RBH; Mendis, GDC; Nanayakkara, HT; Dayananda, NWN
This paper proposes a portable wound area measurement method based on the segmentation of digital images. Its objective is to provide a practical, fast and non-invasive technique for medical staff to monitor the healing process of chronic wounds. Segmentation is based on active contour models which identifies the wound border irrespective of coloration and shape. The initial segmentation can also be modified by the user, providing higher control and accuracy. Area measurements are further normalized to remove effects of camera distance and angle. The application has been implemented for the Android platform version 2.2 with a prototype model running on Samsung Galaxy Tab. The results to evaluate the efficacy of the application have been encouraging with an accuracy level of 90%.
item:
A Portable remote medical consultation system for the use of distant rural communities
Kumarawadu, SP; Dayananda, NWN; Thavaneswaran, B; Tharmakulsingam, M; Paramanathan, N; Perera, L; Mohamed, S
Remote medical monitoring and consultation has become indispensable in order to enhance the availability of better health-care services to the patients in remote rural areas in the country. This paper proposes an inexpensive, easy to handle Remote Medical Consultation System (RMCS) which supports the healthcare workers to carry out their services through bi-directional video and voice communication between the remote end and doctor’s end as well as automated measuring of medical parameters that can be controlled from both ends. RMCS is consisted of a wearable sensors kit, a centralized hardware platform which connects to the medical sensors and devices and a software platform with database for operating and managing the system. RMCS is capable of remotely measuring patient’s blood pressure, heart rate, body temperature, electrocardiogram (ECG), heart sounds and the system’s platform supports to add-on more medical sensors or devices. The key aspect of the system is that it reduces most of the complexity in operation and facilitates the doctors to monitor and diagnose the patients in real-time. RMCS was essentially developed to eliminate the issues of low quality healthcare services in rural areas and to assist in monitoring immobilized patients.
item: Article-Abstract
Simulating haptic feedback of abdomen organs on Laparoscopic Surgery Tools
Kannangara, SM; Fernando, E; Kumarage, SK; Dayananda, NWN
Minimally invasive surgeries (MIS) such as laparoscopic procedures are widely used for many types of abdomen surgeries because of its numerous advantages over open surgeries. They require very high level of skills of surgeons acquired through experience. The best and the safest way of getting hands on experience is the computer simulation or virtual reality (VR). The VR surgical simulators have a great potential to revolutionize the training paradigm of surgical interns. The haptic feedback plays as equally asvisual feedback to provide realistic environment to trainees. In this paper, we present a method incorporate hapitics on VR simulator. A software procedure is developed using the Libraries of Open Haptic Toolkit along with the Open GL graphic libraries to implement three basic haptic ranges: soft, mild(firm) and hard into organ models. The feedback of the expert surgeons in the field was obtained to model the organs rather than measuring mechanical properties of soft tissues due to practical limitations. A commercially available six Degrees of Freedom (DoF) position sensing and three DoF force feedback haptic devices are used to implement the interface.
item: Conference-Abstract
A Technological solution to maintain the reliability of arterial blood gas sample prior to arterial blood gas analysis
(Faculty of Medicine, University of Moratuwa, 2024) Madushani, APS; Madhushani, PYN; Manoramya, WLHP; Mushpika, MMF; Nafla, MNF; Dayananda, NWN; Dinupa, T; Kottahachhi, J; Peries, WANN; Talagala, I; Samarasinghe, T; Fernando, NS; Pasqual, D; Chandran, T; Shajahan, Z
Arterial Blood Gas (ABG) Analysis is used in medical wards to investigate acid-base status, hemoglobin concentration, blood glucose and electrolyte levels of a patient’s arterial blood sample. The sample must be transported to the laboratory as soon as possible for analysis within 15-30 minutes of collection. For accurate analysis, sample integrity must be maintained during transport. Temperature variations can significantly alter the composition of the sample, producing unreliable results. To address this issue, this study developed a unique device that monitors and regulates the temperature of ABG samples.