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Journal of Biomedical Optics

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https://www.readbyqxmd.com/read/28698890/change-of-tumor-vascular-reactivity-during-tumor-growth-and-postchemotherapy-observed-by-near-infrared-spectroscopy
#1
Songhyun Lee, Hyeryun Jeong, Myeongsu Seong, Jae Gwan Kim
Breast cancer is one of the most common cancers in females. To monitor chemotherapeutic efficacy for breast cancer, medical imaging systems such as x-ray mammography, computed tomography, magnetic resonance imaging, and ultrasound imaging have been used. Currently, it can take up to 3 to 6 weeks to see the tumor response from chemotherapy by monitoring tumor volume changes. We used near-infrared spectroscopy (NIRS) to predict breast cancer treatment efficacy earlier than tumor volume changes by monitoring tumor vascular reactivity during inhalational gas interventions...
December 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28698889/blue-diode-laser-versus-traditional-infrared-diode-laser-and-quantic-molecular-resonance-scalpel-clinical-and-histological-findings-after-excisional-biopsy-of-benign-oral-lesions
#2
Margherita Gobbo, Rossana Bussani, Giuseppe Perinetti, Katia Rupel, Lorenzo Bevilaqua, Giulia Ottaviani, Matteo Biasotto
This study aims to compare the use of the innovative blue diode laser (BLUE group) with two traditional surgical techniques: the infrared diode laser (IR group) and the quantic molecular resonance scalpel (QMR group) in the excision of benign oral lesions. Ninety-three patients underwent surgical excision of a benign oral lesion and were followed up for 30 days for pain (0 to 10 visual analogue scale), bleeding, and painkillers’ assumption (yes/no). A blind pathologist evaluated the thermal damage along the cutting margin...
December 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29160043/influence-of-probe-pressure-on-diffuse-reflectance-spectra-of-human-skin-measured-in-vivo
#3
Alexey P Popov, Alexander V Bykov, Igor V Meglinski
Mechanical pressure superficially applied on the human skin surface by a fiber-optic probe influences the spatial distribution of blood within the cutaneous tissues. Upon gradual load of weight on the probe, a stepwise increase in the skin reflectance spectra is observed. The decrease in the load follows the similar inverse staircase-like tendency. The observed stepwise reflectance spectra changes are due to, respectively, sequential extrusion of blood from the topical cutaneous vascular beds and their filling afterward...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29148272/adolf-friedrich-fercher-a-pioneer-of-biomedical-optics
#4
Christoph K Hitzenberger
Adolf Friedrich Fercher, an outstanding pioneer of biomedical optics, passed away earlier this year. He was a brilliant and visionary researcher who pioneered various fields of biomedical optics, such as laser speckle flowgraphy, tissue interferometry, and optical coherence tomography (OCT). On the occasion of the 25th anniversary of OCT, this paper reviews and commemorates Fercher's pioneering work.
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29148271/high-refractive-index-of-acrylate-embedding-resin-clarifies-mouse-brain-tissue
#5
Hongfu Zhou, Yumiao Xiong, Yu Wang, Xiaojun Wang, Pei Li, Yadong Gang, Xiuli Liu, Shaoqun Zeng
Biological tissue transparency combined with light-sheet fluorescence microscopy is a useful method for studying the neural structure of biological tissues. The development of light-sheet fluorescence microscopy also promotes progress in biological tissue clearing methods. The current clarifying methods mostly use liquid reagent to denature protein or remove lipids first, to eliminate or reduce the scattering index or refractive index of the biological tissue. However, denaturing protein and removing lipids require complex procedures or an extended time period...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29139245/evaluation-of-a-pointwise-microcirculation-assessment-method-using-liquid-and-multilayered-tissue-simulating-phantoms
#6
Ingemar Fredriksson, Rolf B Saager, Anthony J Durkin, Tomas Strömberg
A fiber-optic probe-based instrument, designed for assessment of parameters related to microcirculation, red blood cell tissue fraction (fRBC), oxygen saturation (SO2), and speed resolved perfusion, has been evaluated using state-of-the-art tissue phantoms. The probe integrates diffuse reflectance spectroscopy (DRS) at two source-detector separations and laser Doppler flowmetry, using an inverse Monte Carlo method for identifying the parameters of a multilayered tissue model. Here, we characterize the accuracy of the DRS aspect of the instrument using (1) liquid blood phantoms containing yeast and (2) epidermis-dermis mimicking solid-layered phantoms fabricated from polydimethylsiloxane, titanium oxide, hemoglobin, and coffee...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29139244/raman-exfoliative-cytology-for-oral-precancer-diagnosis
#7
Aditi Sahu, Poonam Gera, Venkatesh Pai, Abhishek Dubey, Gunjan Tyagi, Mandavi Waghmare, Sandeep Pagare, Manoj Mahimkar, C Murali Krishna
Oral premalignant lesions (OPLs) such as leukoplakia, erythroplakia, and oral submucous fibrosis, often precede oral cancer. Screening and management of these premalignant conditions can improve prognosis. Raman spectroscopy has previously demonstrated potential in the diagnosis of oral premalignant conditions (in vivo), detected viral infection, and identified cancer in both oral and cervical exfoliated cells (ex vivo). The potential of Raman exfoliative cytology (REC) in identifying premalignant conditions was investigated...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29139243/wide-field-spectrally-resolved-quantitative-fluorescence-imaging-system-toward-neurosurgical-guidance-in-glioma-resection
#8
Yijing Xie, Maria Thom, Michael Ebner, Victoria Wykes, Adrien Desjardins, Anna Miserocchi, Sebastien Ourselin, Andrew W McEvoy, Tom Vercauteren
In high-grade glioma surgery, tumor resection is often guided by intraoperative fluorescence imaging. 5-aminolevulinic acid-induced protoporphyrin IX (PpIX) provides fluorescent contrast between normal brain tissue and glioma tissue, thus achieving improved tumor delineation and prolonged patient survival compared with conventional white-light-guided resection. However, commercially available fluorescence imaging systems rely solely on visual assessment of fluorescence patterns by the surgeon, which makes the resection more subjective than necessary...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29129041/line-scanning-confocal-microendoscope-for-nuclear-morphometry-imaging
#9
Yubo Tang, Jennifer Carns, Rebecca R Richards-Kortum
Fiber-optic endomicroscopy is a minimally invasive method to image cellular morphology in vivo. Using a coherent fiber bundle as an image relay, it allows additional imaging optics to be placed at the distal end of the fiber outside the body. In this research, we use this approach to demonstrate a compact, low-cost line-scanning confocal fluorescence microendoscope that can be constructed for <$5000. Confocal imaging is enabled without the need for mechanical scanning by synchronizing a digital light projector with the rolling shutter of a CMOS camera...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29129040/lensless-imaging-through-multiple-phase-patterns-illumination
#10
Anwar Hussain, Yicheng Li, Diyi Liu, Cuifang Kuang, Xu Liu
A stable optical system is required to acquire a high-quality image. A motionless lensless setup is designated to obtain high-resolution and large field of view images. The sample is sequentially illuminated with multiple random phase patterns, and the recorded images are subtracted from the system calibration images correspondingly. The resultant images are propagated to the sample plane. The summation of all images yields a final image with resolution of ∼4  μm, field of view of ∼15  mm2, and better signal-to-noise ratio...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29127693/x-ray-luminescence-computed-tomography-using-a-focused-x-ray-beam
#11
Wei Zhang, Michael C Lun, Alex Anh-Tu Nguyen, Changqing Li
Due to the low x-ray photon utilization efficiency and low measurement sensitivity of the electron multiplying charge coupled device camera setup, the collimator-based narrow beam x-ray luminescence computed tomography (XLCT) usually requires a long measurement time. We, for the first time, report a focused x-ray beam-based XLCT imaging system with measurements by a single optical fiber bundle and a photomultiplier tube (PMT). An x-ray tube with a polycapillary lens was used to generate a focused x-ray beam whose x-ray photon density is 1200 times larger than a collimated x-ray beam...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29127692/coagulation-measurement-from-whole-blood-using-vibrating-optical-fiber-in-a-disposable-cartridge
#12
Yusuf Samet Yaraş, Ali Bars Gündüz, Gökhan Sağlam, Selim Ölçer, Fehmi Civitçi, İbrahim Baris, Göksenin Yaralioğlu, Hakan Urey
In clinics, blood coagulation time measurements are performed using mechanical measurements with blood plasma. Such measurements are challenging to do in a lab-on-a-chip (LoC) system using a small volume of whole blood. Existing LoC systems use indirect measurement principles employing optical or electrochemical methods. We developed an LoC system using mechanical measurements with a small volume of whole blood without requiring sample preparation. The measurement is performed in a microfluidic channel where two fibers are placed inline with a small gap in between...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29119742/super-resolution-structured-illumination-in-optically-thick-specimens-without-fluorescent-tagging
#13
Zachary R Hoffman, Charles A DiMarzio
This research extends the work of Hoffman et al. to provide both sectioning and super-resolution using random patterns within thick specimens. Two methods of processing structured illumination in reflectance have been developed without the need for a priori knowledge of either the optical system or the modulation patterns. We explore the use of two deconvolution algorithms that assume either Gaussian or sparse priors. This paper will show that while both methods accomplish their intended objective, the sparse priors method provides superior resolution and contrast against all tested targets, providing anywhere from ∼1...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29110446/dense-concentric-circle-scanning-protocol-for-measuring-pulsatile-retinal-blood-flow-in-rats-with-doppler-optical-coherence-tomography
#14
Bingyao Tan, Zohreh Hosseinaee, Kostadinka Bizheva
The variability in the spatial orientation of retinal blood vessels near the optic nerve head (ONH) results in imprecision of the measured Doppler angle and therefore the pulsatile blood flow (BF), when those parameters are evaluated using Doppler OCT imaging protocols based on dual-concentric circular scans. Here, we utilized a dense concentric circle scanning protocol and evaluated its precision for measuring pulsatile retinal BF in rats for different numbers of the circular scans. An spectral domain optical coherence tomography (SD-OCT) system operating in the 1060-nm spectral range with image acquisition rate of 47,000 A-scans/s was used to acquire concentric circular scans centered at the rat's ONH, with diameters ranging from 0...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29110445/monitoring-early-phases-of-orthodontic-treatment-by-means-of-raman-spectroscopies
#15
Fabrizia d'Apuzzo, Letizia Perillo, Ines Delfino, Marianna Portaccio, Maria Lepore, Carlo Camerlingo
Gingival crevicular fluid (GCF) is a site-specific exudate in the gingival sulcus. GCF composition changes in response to diseases or mechanical stimuli, such as those occurring during orthodontic treatments. Raman microspectroscopy (μ-RS) and surface-enhanced Raman spectroscopy (SERS) were adopted for a GCF analysis during different initial phases of orthodontic force application. GCF samples were pooled from informed patients using paper cones. SERS spectra were obtained from GCF extracted from these cones, whereas μ-RS spectra were directly acquired on paper cones without any manipulation...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29110444/noninvasive-in-vivo-optical-characterization-of-blood-flow-and-oxygen-consumption-in-the-superficial-plexus-of-skin
#16
Faezeh Talebi Liasi, Ravikant Samatham, Steven L Jacques
Assessing the metabolic activity of a tissue, whether normal, damaged, aged, or pathologic, is useful for diagnosis and evaluating the effects of drugs. This report describes a handheld optical fiber probe that contacts the skin, applies pressure to blanch the superficial vascular plexus of the skin, then releases the pressure to allow refill of the plexus. The optical probe uses white light spectroscopy to record the time dynamics of blanching and refilling. The magnitude and dynamics of changes in blood content and hemoglobin oxygen saturation yield an estimate of the oxygen consumption rate (OCR) in units of attomoles per cell per second...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29098812/combined-high-contrast-and-wide-field-of-view-in-the-scanning-laser-ophthalmoscope-through-dual-detection-of-light-paths
#17
Guillem Carles, Gonzalo Muyo, Jano van Hemert, Andrew R Harvey
We demonstrate a multimode detection system in a scanning laser ophthalmoscope (SLO) that enables simultaneous operation in confocal, indirect, and direct modes to permit an agile trade between image contrast and optical sensitivity across the retinal field of view to optimize the overall imaging performance, enabling increased contrast in very wide-field operation. We demonstrate the method on a wide-field SLO employing a hybrid pinhole at its image plane, to yield a twofold increase in vasculature contrast in the central retina compared to its conventional direct mode while retaining high-quality imaging across a wide field of the retina, of up to 200 deg and 20  μm on-axis resolution...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29098811/deep-neural-network-based-bandwidth-enhancement-of-photoacoustic-data
#18
Sreedevi Gutta, Venkata Suryanarayana Kadimesetty, Sandeep Kumar Kalva, Manojit Pramanik, Sriram Ganapathy, Phaneendra K Yalavarthy
Photoacoustic (PA) signals collected at the boundary of tissue are always band-limited. A deep neural network was proposed to enhance the bandwidth (BW) of the detected PA signal, thereby improving the quantitative accuracy of the reconstructed PA images. A least square-based deconvolution method that utilizes the Tikhonov regularization framework was used for comparison with the proposed network. The proposed method was evaluated using both numerical and experimental data. The results indicate that the proposed method was capable of enhancing the BW of the detected PA signal, which inturn improves the contrast recovery and quality of reconstructed PA images without adding any significant computational burden...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29094524/multiscale-sensorless-adaptive-optics-oct-angiography-system-for-in-vivo-human-retinal-imaging
#19
Myeong Jin Ju, Morgan Heisler, Daniel Wahl, Yifan Jian, Marinko V Sarunic
We present a multiscale sensorless adaptive optics (SAO) OCT system capable of imaging retinal structure and vasculature with various fields-of-view (FOV) and resolutions. Using a single deformable mirror and exploiting the polarization properties of light, the SAO-OCT-A was implemented in a compact and easy to operate system. With the ability to adjust the beam diameter at the pupil, retinal imaging was demonstrated at two different numerical apertures with the same system. The general morphological structure and retinal vasculature could be observed with a few tens of micrometer-scale lateral resolution with conventional OCT and OCT-A scanning protocols with a 1...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28982000/shining-future-of-biomedical-optics
#20
Lihong Wang
Lihong V. Wang summarizes his tenure as Editor-in-Chief of the Journal of Biomedical Optics and introduces his successor, Brian Pogue, who will assume the role in January 2018.
October 4, 2017: Journal of Biomedical Optics
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