Measurement of the volume of a leg ulcer using a laser scanner

Marjanovic, D; Dugdale, R E; Vowden, Peter; Vowden, Kathryn

doi:10.1088/0967-3334/19/4/008

Cited by 19 publications

(18 citation statements)

References 14 publications

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“…8 Three-dimensional wound measurement devices include stereophotogammetry, 9 digital videometry, 10 ultrasound measurement, and laser scanning. 11 The ideal wound measurement device would be able to record irregular surfaces in a three-dimensional nontouch technique. 9 While the ideal instrument does not exist, we have worked with several computer-based planimetric systems.…”

Section: Introductionmentioning

confidence: 99%

Digital Planimetry Results in More Accurate Wound Measurements: A Comparison to Standard Ruler Measurements

Rogers

Bevilacqua

Armstrong

et al. 2010

J Diabetes Sci Technol

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Section: Introductionmentioning

confidence: 99%

Digital Planimetry Results in More Accurate Wound Measurements: A Comparison to Standard Ruler Measurements

Rogers

Bevilacqua

Armstrong

et al. 2010

J Diabetes Sci Technol

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“…Laser scanning. Laser scanning can be used to measure the wounds provided the patient remains still during the scan period (Marjanovic et al, 1998). This cannot be guaranteed for a dynamic living object like the human body.…”

mentioning

confidence: 99%

Development of a Robust Photogrammetric Metrology System for Monitoring the Healing of Bedsores

Malian¹,

Azizi²,

Heuvel³

et al. 2005

The Photogrammetric Record

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A three‐camera close range photogrammetric system for robust and precise measurement of bedsores has been designed and constructed. MEDPHOS (MEDical PHOtogrammetric System) consists of three synchronised cameras with convergent optical axes. A light projector is fixed in the centre of the rig that holds the cameras. A special dot pattern is projected onto the surface to be measured, to compensate for the lack of natural texture on the wound surface. The proposed algorithm consists of the following steps: the cameras and projector are calibrated so that all interior and exterior parameters are known; tailored image segmentation procedures are developed and applied for the detection of the projected pattern dots from the uneven background of the images using morphologic operators; and watershed transformation is used to tackle the problem of overlapping pattern dots. To reduce the effects of non‐uniform illumination and specular reflection of light due to humidity (often the case with wounds), a homomorphic transformation is developed and applied to the images. After segmentation of the images, a connected‐component labelling procedure is used to establish the points for matching. The centroids of these components were precisely calculated. Intensity‐based image matching has been tested without yielding satisfactory results due to the significant deviation from the Lambertian reflection assumption used for solving the correspondence problem. This problem is reliably solved by developing a new algorithm based on geometric constraints that allow feature‐based matching and do not need approximate values of the location of the targets in the images. This robust three‐focal constraint is found to be very effective for matching provided the necessary conditions for the system configuration are met. Auxiliary photometric constraints together with the calibrated projector (which is treated like an active camera) also serve as additional sources of information for reducing the number of remaining ambiguities and checking the consistency of the results. Almost all of the required biometric information can be obtained rapidly, robustly and easily using MEDPHOS. Experimental results showed the effectiveness of the proposed technique.

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“…(Boersma 2000;Luhmann 2010;Davis et al 2013). El riesgo de infección asociado a la utilización de la fotogrametría es mínimo, pero esta técnica hasta ahora ha sido poco aplicable a la medición de úlceras en investigación o clínica, debido al tiempo, habilidad y coste del equipamiento necesarios para la configuración y puesta a punto del sistema, así como la toma y procesamiento de datos (Shaw and Bell, 2011, Mitchell and Newton 2002, Marjanovic et al 1998, Kecelj-Leskovec 2007. Se han realizado algunos estudios con técnicas fotogramétricas para medir variables tridimensionales como el volumen (Langemo et al 2001;Stockton et al 2015), pero son necesarios nuevos estudios para comprobar su exactitud, optimizar su coste y mejorar la configuración del sistema (Jorgensen et al 2016).…”

Section: Papel De La Fotogrametríaunclassified

Procesamiento Automatizado De Modelos Tridimensionales De Úlceras Cutáneas

Sánchez-Jiménez¹,

Buchón-Moragues²,

Palomar-Vázquez³

et al. 2017

Proceedings - 1st Congress in Geomatics Engineering - CIGeo

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Abstract:Geomatics includes techniques such as photogrammetry, remote sensing and geographic information systems, which provide applicable tools in various areas of biomedicine, for example skin ulcer measurement. In previous projects we developed procedures for acquiring data and measuring skin ulcers using a digital photo camera, a manual scanner and photogrammetry software based on correlation. We have tested our technique in a randomized clinical trial in patients with chronic leg ulcers. In the present project an application system is created with the following objectives: automate the processing of three-dimensional models of cutaneous ulcers and generate documentation that ease the interpretation of the evolution of skin ulcers by medical personnel (including PDF report, AVI animation and XOS augmented reality project). We also created a website prototype that stores the documentation, allowing registered users to upload photographs and consult or modify the database of skin ulcers. A test is performed with 50 cutaneous leg ulcers, in order to debug and improve the application system and the website prototype.Key words: Skin ulcers, Wounds, 3D Modelling, Geomatics, Photogrammetry Resumen:La geomática utiliza técnicas como la fotogrametría, teledetección y sistemas de información geográfica, que proporcionan herramientas aplicables a diversas áreas de la biomedicina como, por ejemplo, la medición de úlceras cutáneas. En proyectos anteriores desarrollamos los procedimientos de toma de datos y medición de las dimensiones de las úlceras mediante cámara fotográfica digital, escáner manual y software fotogramétrico de escaneado basado en correlación. Hemos probado nuestra técnica en un ensayo clínico aleatorizado realizado en pacientes con úlceras crónicas de la pierna. En el presente proyecto se crea un sistema de aplicaciones con los siguientes objetivos: automatizar el procesamiento de los modelos tridimensionales de las úlceras cutáneas; generar una documentación que facilite la interpretación de la evolución de la úlcera cutánea por personal médico (incluyendo informe PDF, animación AVI y proyecto de realidad aumentada XOS). También se crea un prototipo de página web que almacene la documentación, permita subir fotografías y consultar o modificar la base de datos de úlceras cutáneas. Se realiza una prueba con datos de 50 úlceras cutáneas de pierna, para depurar y mejorar el sistema de aplicaciones y el prototipo de página web.

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Measurement of the volume of a leg ulcer using a laser scanner

Cited by 19 publications

References 14 publications

Digital Planimetry Results in More Accurate Wound Measurements: A Comparison to Standard Ruler Measurements

Digital Planimetry Results in More Accurate Wound Measurements: A Comparison to Standard Ruler Measurements

Development of a Robust Photogrammetric Metrology System for Monitoring the Healing of Bedsores

Procesamiento Automatizado De Modelos Tridimensionales De Úlceras Cutáneas

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