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Journal of Biomedical Optics

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https://www.readbyqxmd.com/read/29790320/ultrasonic-standing-wave-preparation-of-a-liquid-cell-for-glucose-measurements-in-urine-by-midinfrared-spectroscopy-and-potential-application-to-smart-toilets
#1
Naoyuki Yamamoto, Natsumi Kawashima, Tomoya Kitazaki, Keita Mori, Hanyue Kang, Akira Nishiyama, Kenji Wada, Ichiro Ishimaru
Smart toilets could be used to monitor different components of urine in daily life for early detection of lifestyle-related diseases and prompt provision of treatment. For analysis of biological samples such as urine by midinfrared spectroscopy, thin-film samples like liquid cells are needed because of the strong absorption of midinfrared light by water. Conventional liquid cells or fixed cells are prepared based on the liquid membrane method and solution technique, but these are not quantitative and are difficult to set up and clean...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29790319/wideband-linear-detector-arrays-for-optoacoustic-imaging-based-on-polyvinylidene-difluoride-films
#2
Pavel Subochev, Maxim Prudnikov, Vladimir Vorobyev, Anna Postnikova, Egor Sergeev, Valeria Perekatova, Anna Orlova, Valentina Kotomina, Ilya Turchin
We provide direct experimental comparison of the optoacoustic imaging performance of two different 64-element linear detector array (LDA) units based on polyvinylidene difluoride (PVDF) films. The first LDA unit was based on traditional flexible circuit (FC) technology and consisted of an FC glued to the nonmetalized signal surface of a 28-μm-thick PVDF film providing 300  /  80-μm axial resolution/lateral resolution (AR/LR) and 0.4-kPa noise equivalent pressure of its single element. The other LDA unit was manufactured using a technology of low-temperature photolithographic etching (PE) of a signal electrode onto a 25-μm-thick PVDF film providing 300  /  40-μm AR/LR and 1 kPa noise equivalent pressure...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29777581/in-vivo-performance-of-a-visible-wavelength-optical-sensor-for-monitoring-intestinal-perfusion-and-oxygenation
#3
Mitchell B Robinson, Anna M Wisniowiecki, Ryan J Butcher, Mark A Wilson, M Nance Ericson, Gerard L Cote
Traumatic injury resulting in hemorrhage is a prevalent cause of death worldwide. The current standard of care for trauma patients is to restore hemostasis by controlling bleeding and administering intravenous volume resuscitation. Adequate resuscitation to restore tissue blood flow and oxygenation is critical within the first hours following admission to assess severity and avoid complications. However, current clinical methods for guiding resuscitation are not sensitive or specific enough to adequately understand the patient condition...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29777580/context-encoding-enables-machine-learning-based-quantitative-photoacoustics
#4
Thomas Kirchner, Janek Gröhl, Lena Maier-Hein
Real-time monitoring of functional tissue parameters, such as local blood oxygenation, based on optical imaging could provide groundbreaking advances in the diagnosis and interventional therapy of various diseases. Although photoacoustic (PA) imaging is a modality with great potential to measure optical absorption deep inside tissue, quantification of the measurements remains a major challenge. We introduce the first machine learning-based approach to quantitative PA imaging (qPAI), which relies on learning the fluence in a voxel to deduce the corresponding optical absorption...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29774672/glucose-sensitive-silicone-hydrogel-contact-lens-toward-tear-glucose-monitoring
#5
Ramachandram Badugu, Edward Albert Reece, Joseph R Lakowicz
Accurate and reliable monitoring of blood glucose is needed for the treatment of diabetes, which has many challenges, including lack of patient compliance. Measuring tear glucose is an alternative to traditional finger-stick tests used to track blood sugar levels, but glucose sensing using tears has yet to be achieved. We report a methodology for possible tear glucose monitoring using glucose-sensitive silicone hydrogel (SiHG) contact lenses, the primary type of lenses available in today's market. Initially, we assessed the interpenetrating polymer network, with nearly pure silicone and water regions, existing in the SiHGs using a polarity-sensitive probe Prodan...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29766688/assessing-effects-of-pressure-on-tumor-and-normal-tissue-physiology-using-an-automated-self-calibrated-pressure-sensing-probe-for-diffuse-reflectance-spectroscopy
#6
Gregory M Palmer, Hengtao Zhang, Chen-Ting Lee, Husam Mikati, Joseph A Herbert, Marlee Krieger, Jesko von Windheim, Dave Koester, Daniel Stevenson, Daniel J Rocke, Ramon Esclamado, Alaatin Erkanli, Nirmala Ramanujam, Mark W Dewhirst, Walter T Lee
Diffuse reflectance spectroscopy (DRS) represents a quantitative, noninvasive, nondestructive means of assessing vascular oxygenation, vascularity, and structural properties. However, it is known that such measurements can be influenced by the effects of pressure, which is a major concern for reproducible and operator-independent assessment of tissues. Second, regular calibration is a necessary component of quantitative DRS to account for factors such as lamp decay and fiber bending. Without a means of reliably controlling for these factors, the accuracy of any such assessments will be reduced, and potentially biased...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29766687/structured-illumination-to-spatially-map-chromatin-motions
#7
Keith Bonin, Amanda Smelser, Naike Salvador Moreno, George Holzwarth, Kevin Wang, Preston Levy, Pierre-Alexandre Vidi
We describe a simple optical method that creates structured illumination of a photoactivatable probe and apply this method to characterize chromatin motions in nuclei of live cells. A laser beam coupled to a diffractive optical element at the back focal plane of an excitation objective generates an array of near diffraction-limited beamlets with FWHM of 340  ±  30  nm, which simultaneously photoactivate a 7  ×  7 matrix pattern of GFP-labeled histones, with spots 1.70  μm apart. From the movements of the photoactivated spots, we map chromatin diffusion coefficients at multiple microdomains of the cell nucleus...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29766686/multimodal-approach-in-assessment-of-the-response-of-breast-cancer-to-neoadjuvant-chemotherapy
#8
Mikhail Viktorovich Pavlov, Tatyana Igorevna Kalganova, Yekaterina Sergeevna Lyubimtseva, Vladimir Ivanovich Plekhanov, German Yurievich Golubyatnikov, Olga Yevgenyevna Ilyinskaya, Anna Gennadjevna Orlova, Pavel Vladimirovich Subochev, Dmitriy Vladimirovich Safonov, Natalia Mikhailovna Shakhova, Anna Vladimirovna Maslennikova
The ability for noninvasive visualization of functional changes of a tumor's oxygenation and circulatory system offers new advantages for prognosis and monitoring of the treatment efficacy. The results of breast cancer oxygen state study under chemotherapy action obtained by diffuse optical spectroscopy (DOS) in combination with Doppler ultrasonic imaging are presented. Complex use of optical and ultrasound methods gives complementary information about the size of the tumor node, peculiarities of its vascular bed, rate of its blood flow as well as oxygenation, and provide a picture of the tumor response to treatment...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29766685/test-retest-reliability-of-brain-mitochondrial-cytochrome-c-oxidase-assessed-by-functional-near-infrared-spectroscopy
#9
Lisa Holper, J John Mann
Functional near-infrared spectroscopy (fNIRS) is a noninvasive method for measuring in vivo both hemodynamic and mitochondrial metabolic activities in brain cortical structures. Although the test-retest reliability of the hemodynamic measures, such as reflected by oxygenated (HbO2), deoxygenated (HHb) hemoglobin, and the tissue oxygenation index (TOI), has been previously reported to be good to excellent, the reliability of the metabolic signal indexed by oxidized cytochrome-c-oxidase (oxCCO) has not been reported...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29752801/in-vivo-super-resolution-imaging-of-transient-retinal-phototropism-evoked-by-oblique-light-stimulation
#10
Yiming Lu, Changgeng Liu, Xincheng Yao
Rod-dominated transient retinal phototropism (TRP) has been observed in freshly isolated retinas, promising a noninvasive biomarker for objective assessment of retinal physiology. However, in vivo mapping of TRP is challenging due to its subcellular signal magnitude and fast time course. We report here a virtually structured detection-based super-resolution ophthalmoscope to achieve subcellular spatial resolution and millisecond temporal resolution for in vivo imaging of TRP. Spatiotemporal properties of in vivo TRP were characterized corresponding to variable light intensity stimuli, confirming that TRP is tightly correlated with early stages of phototransduction...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29752800/raman-biophysical-markers-in-skin-cancer-diagnosis
#11
Xu Feng, Austin J Moy, Hieu T M Nguyen, Yao Zhang, Jason Zhang, Matthew C Fox, Katherine R Sebastian, Jason S Reichenberg, Mia K Markey, James W Tunnell
Raman spectroscopy (RS) has demonstrated great potential for in vivo cancer screening; however, the biophysical changes that occur for specific diagnoses remain unclear. We recently developed an inverse biophysical skin cancer model to address this issue. Here, we presented the first demonstration of in vivo melanoma and nonmelanoma skin cancer (NMSC) detection based on this model. We fit the model to our previous clinical dataset and extracted the concentration of eight Raman active components in 100 lesions in 65 patients diagnosed with malignant melanoma (MM), dysplastic nevi (DN), basal cell carcinoma, squamous cell carcinoma, and actinic keratosis...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29752799/polyethylene-glycol-molecular-weight-influences-the-cleart2-optical-clearing-method-for-spheroids-imaging-by-confocal-laser-scanning-microscopy
#12
Elisabete C Costa, André F Moreira, Duarte de Melo-Diogo, Ilídio J Correia
Some fluorescence microscopy techniques, such as confocal laser scanning microscopy (CLSM), have a limited penetration depth. Consequently, the visualization and imaging of three-dimensional (3-D) cell cultures, such as spheroids, using these methods can be a significant challenge. Therefore, to improve the imaging of 3-D tissues, optical clearing methods have been optimized to render transparency to the opaque spheroids. The influence of the polyethylene glycol (PEG) molecular weight (MW) used in the ClearT2 method for the imaging of propidium iodide (PI)-stained spheroids was investigated...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29752798/review-of-human-hair-optical-properties-in-possible-relation-to-melanoma-development
#13
Xiyong Huang, Michael D Protheroe, Ahmed M Al-Jumaily, Sharad P Paul, Andrew N Chalmers
Immigration and epidemiological studies provide evidence indicating the correlation of high ultraviolet exposure during childhood and increased risks of melanoma in later life. While the explanation of this phenomenon has not been found in the skin, a class of hair has been hypothesized to be involved in this process by transmitting sufficient ultraviolet rays along the hair shaft to possibly cause damage to the stem cells in the hair follicle, ultimately resulting in melanoma in later life. First, the anatomy of hair and its possible contribution to melanoma development, and the tissue optical properties are briefly introduced to provide the necessary background...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29752797/region-based-multifocus-image-fusion-for-the-precise-acquisition-of-pap-smear-images
#14
Santiago Tello-Mijares, Jesús Bescós
A multifocus image fusion method to obtain a single focused image from a sequence of microscopic high-magnification Papanicolau source (Pap smear) images is presented. These images, captured each in a different position of the microscope lens, frequently show partially focused cells or parts of cells, which makes them unpractical for the direct application of image analysis techniques. The proposed method obtains a focused image with a high preservation of original pixels information while achieving a negligible visibility of the fusion artifacts...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29752796/transdermal-optical-renal-function-monitoring-in-humans-development-verification-and-validation-of-a-prototype-device
#15
Martin P Debreczeny, Richard B Dorshow
A prototype medical device for monitoring kidney function by transdermal measurement of the clearance rate of the exogenous fluorescent tracer agent MB-102 (administered intravenously) was developed. Verification of the device with an in vitro protocol is described. The expected renal clearance of the agent was mimicked by preparing a dilution series of MB-102 in the presence of a scattering agent. The slope of a linear fit to the logarithm of fluorescence intensity as a function of dilution step agreed with predictions within 5%, a level of accuracy that would be adequate in assessment of GFR to prevent misdiagnosis of kidney disease...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29749141/particle-swarm-optimization-method-for-small-retinal-vessels-detection-on-multiresolution-fundus-images
#16
Bilal Khomri, Argyrios Christodoulidis, Leila Djerou, Mohamed Chaouki Babahenini, Farida Cheriet
Retinal vessel segmentation plays an important role in the diagnosis of eye diseases and is considered as one of the most challenging tasks in computer-aided diagnosis (CAD) systems. The main goal of this study was to propose a method for blood-vessel segmentation that could deal with the problem of detecting vessels of varying diameters in high- and low-resolution fundus images. We proposed to use the particle swarm optimization (PSO) algorithm to improve the multiscale line detection (MSLD) method. The PSO algorithm was applied to find the best arrangement of scales in the MSLD method and to handle the problem of multiscale response recombination...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29745133/effect-of-intraocular-scattering-in-macular-pigment-optical-density-measurements
#17
Dimitrios Christaras, Alexandros Pennos, Harilaos Ginis, Pablo Artal
Fundus reflectometry is a common in-vivo, noninvasive method to estimate the macular pigment optical density (MPOD). The measured density, however, can be affected by the individual's intraocular scattering. Scattering causes a reduction in the contrast of the fundus image, which in turn leads to an underestimation of the measured density. Intraocular scattering was measured optically in a group of seven young, healthy subjects using the method of optical integration and was subsequently used to correctly estimate the MPOD from fundus images...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29745132/monitoring-metabolic-reactions-in-staphylococcus-epidermidis-exposed-to-silicon-nitride-using-in-situ-time-lapse-raman-spectroscopy
#18
Francesco Boschetto, Tetsuya Adachi, Satoshi Horiguchi, Danny Fainozzi, Fulvio Parmigiani, Elia Marin, Wenliang Zhu, Bryan McEntire, Toshiro Yamamoto, Narisato Kanamura, Osam Mazda, Eriko Ohgitani, Giuseppe Pezzotti
Staphylococcus epidermidis (S. epidermidis) is one of the leading nosocomial pathogens, particularly associated with periprosthetic infections of biomedical implants. Silicon nitride (Si3N4), a nonoxide biomaterial widely used in spinal implants, has shown bacteriostatic effects against both gram-positive and gram-negative bacteria; however, the physicochemical interactions between Si3N4 and bacteria yet remain conspicuously unexplored. In situ time-lapse Raman spectroscopic experiments were conducted by exposing S...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29745131/navigating-surgical-fluorescence-cameras-using-near-infrared-optical-tracking
#19
Matthias van Oosterom, David den Houting, Cornelis van de Velde, Fijs van Leeuwen
Fluorescence guidance facilitates real-time intraoperative visualization of the tissue of interest. However, due to attenuation, the application of fluorescence guidance is restricted to superficial lesions. To overcome this shortcoming, we have previously applied three-dimensional surgical navigation to position the fluorescence camera in reach of the superficial fluorescent signal. Unfortunately, in open surgery, the near-infrared (NIR) optical tracking system (OTS) used for navigation also induced an interference during NIR fluorescence imaging...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29745130/intraoperative-hyperspectral-determination-of-human-tissue-properties
#20
Eric Larry Wisotzky, Florian Cornelius Uecker, Philipp Arens, Steffen Dommerich, Anna Hilsmann, Peter Eisert
We address the automatic differentiation of human tissue using multispectral imaging with promising potential for automatic visualization during surgery. Currently, tissue types have to be continuously differentiated based on the surgeon's knowledge only. Further, automatic methods based on optical in vivo properties of human tissue do not yet exist, as these properties have not been sufficiently examined. To overcome this, we developed a hyperspectral camera setup to monitor the different optical behavior of tissue types in vivo...
May 2018: Journal of Biomedical Optics
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