Person:
Sprigle,
Stephen
Sprigle,
Stephen
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ORCID
0000-0003-0462-0138
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ItemStudy on Alleviation Pressure Cushion(Georgia Institute of Technology, 2010-06) Kong, Linghua ; Sprigle, Stephen ; Davis, Kim ; Wang, ChaoThe alleviation pressure (AP) cushion is a dynamic cushion system with three bladders at the pelvic region. The bladders can be deflated and inflated in a certain sequence to relieve the pressure on the ischial tuberosiites (IT) and coccyx/sacrum. The design of the foam base, bladder and pneumatic and electronic system of the AP cushion is discussed in this paper. And testing is conducted to verify the effectiveness of the AP cushion.
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ItemSingle sensor that outputs narrowband multispectral images(Georgia Institute of Technology, 2010-01) Kong, Linghua ; Yi, Dingrong ; Sprigle, Stephen ; Wang, Fengtao ; Wang, Chao ; Liu, Fuhan ; Adibi, Ali ; Tummala, Rao R.We report the work of developing a hand-held (or miniaturized), low-cost, stand-alone, real-time-operation, narrow bandwidth multispectral imaging device for the detection of early stage pressure ulcers.
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ItemInventor-Driven Product Development(Georgia Institute of Technology, 2010) Sprigle, Stephen ; Maurer, Chris ; Kong, LinghuaInventors of assistive technology often lack resources to support product development and this may hinder their ability to develop useful and commercially viable devices. The purpose of this on‐going project is to support inventor and small company development of promising mobility-‐related technologies. Specifically, the process includes: 1) an informal brainstorming session addressing technical, market and user issues; 2) formal screening of device potential and RERC capacity to assist in development; 3) invitation to engage inventors/companies with promising technologies; and 4) product testing and/or development of promising technologies. This paper describes the project’s approach and reviews activities over the past year.
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ItemSingle sensor that outputs narrowband multispectral images(Georgia Institute of Technology, 2010-01) Kong, Linghua ; Yi, Dingrong ; Sprigle, Stephen ; Wang, Fengtao ; Wang, Chao ; Liu, Fuhan ; Adibi, Ali ; Tummala, Rao R.We report the work of developing a hand-held (or miniaturized), low-cost, stand-alone, real-time-operation, narrow bandwidth multispectral imaging device for the detection of early stage pressure ulcers.
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ItemDetecting Early Stage Pressure Ulcer on Dark Skin Using Multispectral Imager(Georgia Institute of Technology, 2010) Yi, Dingrong ; Kong, Linghua ; Sprigle, Stephen ; Wang, Fengtao ; Wang, Chao ; Liu, Fuhan ; Adibi, Ali ; Tummala, Rao R.
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ItemDetecting Early Stage Pressure Ulcer on Dark Skin Using Multi Spectral Imager(Georgia Institute of Technology, 2009) Kong, Linghua ; Sprigle, Stephen ; Yi, Dingrong ; Wang, Chao ; Wang, Fengtao ; Liu, Fuhan ; Wang, Jiwu ; Zhao, FutingThis paper introduces a novel idea, innovative technology in building multi spectral imaging based device. The benefit from them is people can have low cost, handheld and standing alone device which makes acquire multi spectral images real time with just a snapshot. The paper for the first time publishes some images got from such prototyped miniaturized multi spectral imager.
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ItemBruise chromophore concentrations over time(Georgia Institute of Technology, 2008) Duckworth, Mark G. ; Caspall, Jayme J. ; Mappus IV, Rudolph L. ; Kong, Linghua ; Yi, Dingrong ; Sprigle, StephenDuring investigations of potential child and elder abuse, clinicians and forensic practitioners are often asked to offer opinions about the age of a bruise. A commonality between existing methods of bruise aging is analysis of bruise color or estimation of chromophore concentration. Relative chromophore concentration is an underlying factor that determines bruise color. We investigate a method of chromophore concentration estimation that can be employed in a handheld imaging spectrometer with a small number of wavelengths. The method, based on absorbance properties defined by Beer-Lambert's law, allows estimation of differential chromophore concentration between bruised and normal skin. Absorption coefficient data for each chromophore are required to make the estimation. Two different sources of this data are used in the analysis- generated using Independent Component Analysis and taken from published values. Differential concentration values over time, generated using both sources, show correlation to published models of bruise color change over time and total chromophore concentration over time.
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ItemHandheld Erythema and Bruise Detector(Georgia Institute of Technology, 2008) Kong, Linghua ; Sprigle, Stephen ; Duckworth, Mark G. ; Yi, Dingrong ; Caspall, Jayme J. ; Wang, Jiwu ; Zhao, FutingVisual inspection of intact skin is commonly used when assessing persons for pressure ulcers and bruises. Melanin masks skin discoloration hindering visual inspection in people with darkly pigmented skin. The objective of the project is to develop a point of care technology capable of detecting erythema and bruises in persons with darkly pigmented skin. Two significant hardware components, a color filter array and illumination system have been developed and tested. The color filter array targets four defined wavelengths and has been designed to fit onto a CMOS sensor. The crafting process generates a multilayer film on a glass substrate using vacuum ion beam splitter and lithographic techniques. The illumination system is based upon LEDs and targets these same pre-defined wavelengths. Together, these components are being used to create a small, handheld multispectral imaging device. Compared to other multi spectral technologies (multi prisms, optical-acoustic crystal and others), the design provides simple, low cost instrumentation that has many potential multi spectral imaging applications which require a handheld detector.
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ItemMultispectral Image Analysis of Bruise Age(Georgia Institute of Technology, 2007) Sprigle, Stephen ; Yi, Dingrong ; Caspall, Jayme ; Linden, Maureen ; Kong, LinghuaThe detection and aging of bruises is important within clinical and forensic environments. Traditionally, visual and photographic assessment of bruise color is used to determine age, but this qualitative technique has been shown to be inaccurate and unreliable. Spectroscopy and multi-spectral imaging have demonstrated objectivity in identifying age-dependent features. However these devices are not well suited for clinical environments. The purpose of this study was to develop a technique to spectrally-age bruises that minimizes the filtering and hardware requirements while achieving acceptable accuracy. This approach will then be incorporated into a handheld, point-of-care technology that is clinically-viable and affordable. Sixteen bruises from elder residents of a long term care facility were imaged over time. A multi-spectral system collected images at 11 wavelengths ranging between 370-970 nm that corresponded to skin and blood chromophores. Normalized bruise reflectance (NBR)- defined as the ratio of optical reflectance coefficient of bruised skin over that of normal skin- was calculated for all bruises at all wavelengths. The smallest mean NBR, regardless of bruise age, was found at wavelength between 555 & 577nm suggesting that contrast in bruises are from the hemoglobin chromophores, and that they linger for a long duration. A contrast metric, based on the NBR at 460nm and 650nm, was found to be sensitive to age and requires further investigation. Overall, the study identified four key wavelengths that have promise to characterize bruise age. However, the high variability across bruises complicates the development of a handheld detection system until additional data is available.
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ItemDevelopment of Handheld Erythema and Bruise Detectors(Georgia Institute of Technology, 2007) Sprigle, Stephen ; Caspall, Jayme ; Kong, Linghua ; Duckworth, Mark