Abstract:
:In order to monitor dynamic physiological events in near-real time, a variety of photoacoustic computed tomography (PACT) systems have been developed that can rapidly acquire data. Previously reported studies of dynamic PACT have employed conventional static methods to reconstruct a temporally ordered sequence of images on a frame-by-frame basis. Frame-by-frame image reconstruction (FBFIR) methods fail to exploit correlations between data frames and are known to be statistically and computationally suboptimal. In this study, a low-rank matrix estimation-based spatiotemporal image reconstruction (LRME-STIR) method is investigated for dynamic PACT applications. The LRME-STIR method is based on the observation that, in many PACT applications, the number of frames is much greater than the rank of the ideal noiseless data matrix. Using both computer-simulated and experimentally measured photoacoustic data, the performance of the LRME-STIR method is compared with that of conventional FBFIR method followed by image-domain filtering. The results demonstrate that the LRME-STIR method is not only computationally more efficient but also produces more accurate dynamic PACT images than a conventional FBFIR method followed by image-domain filtering.
journal_name
J Biomed Optjournal_title
Journal of biomedical opticsauthors
Wang K,Xia J,Li C,Wang LV,Anastasio MAdoi
10.1117/1.JBO.19.5.056007subject
Has Abstractpub_date
2014-05-01 00:00:00pages
056007issue
5eissn
1083-3668issn
1560-2281pii
1871636journal_volume
19pub_type
杂志文章abstract::Artificial neural stimulation is widely used in clinic, rehabilitation, and research. One of the limitations of electrical stimulation is the current spread in tissue. Recently, pulsed mid-infrared laser stimulation of nerves has been investigated as an alternative stimulation method. The likely benefits of infrared n...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.3655590
更新日期:2011-11-01 00:00:00
abstract::Microscopic visualization of islets of Langerhans under normal and diabetic conditions is essential for understanding the pathophysiology of the disease. The intrinsic opacity of pancreata, however, limits optical accessibility for high-resolution light microscopy of islets in situ. Because the standard microtome-base...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.3470241
更新日期:2010-07-01 00:00:00
abstract::A transgenic mouse model with a Clim [co-factor of LIM (a combination of first letters of Lin-11 (C. elegans), ISL1 (rat), and Mec-3 (C. elegans) gene names) domain proteins] gene partially blocked in the epithelial compartment of its tissues is used to establish the sensitivity of intrinsic reflectance nonlinear opti...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.2163254
更新日期:2006-01-01 00:00:00
abstract::We investigate optoelectronic properties of integrated structures comprising semiconductor light-emitting materials for optical probes of microscopic biological systems. Compound semiconductors are nearly ideal light emitters for probing cells and other microorganisms because of their spectral match to the transparenc...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.1506931
更新日期:2002-10-01 00:00:00
abstract::We present the light scattering properties of individual human red blood cells (RBCs). We show that both the RBC static and dynamic scattering signals are altered by adenosine 5'-triphosphate (ATP)-driven membrane metabolic remodeling. To measure the light scattering signal from individual RBCs, we use diffraction pha...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.3524509
更新日期:2011-01-01 00:00:00
abstract::We present Monte Carlo modeling studies to provide a quantitative understanding of contrast observed in spatially resolved reflectance spectra of normal and highly dysplastic cervical tissue. Simulations have been carried out to analyze the sensitivity of spectral measurements to a range of changes in epithelial and s...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.2398932
更新日期:2006-11-01 00:00:00
abstract::Second-harmonic generation (SHG) imaging can help reveal interactions between collagen fibers and cancer cells. Quantitative analysis of SHG images of collagen fibers is challenged by the heterogeneity of collagen structures and low signal-to-noise ratio often found while imaging collagen in tissue. The role of collag...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.19.1.016007
更新日期:2014-01-01 00:00:00
abstract::Oxidative stress has become an exciting area of schizophrenia (SCZ) research, and provides ample opportunities and hope for a better understanding of its pathophysiology, which may lead to new treatment strategies. The first objective of the present study was to analyze the oxidative stress markers in breath samples o...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.20.5.057006
更新日期:2015-05-01 00:00:00
abstract::The excited state lifetime of a fluorophore together with its fluorescence emission spectrum provide information that can yield valuable insights into the nature of a fluorophore and its microenvironment. However, it is difficult to obtain both channels of information in a conventional scheme as detectors are typicall...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.25.1.014506
更新日期:2019-12-01 00:00:00
abstract::In breast surgery, a lack of knowledge about what is below the tissue surface may lead to positive tumor margins and iatrogenic damage. Diffuse reflectance spectroscopy (DRS) is a spectroscopic technique that can distinguish between healthy and tumor tissue making it a suitable technology for intraoperative guidance. ...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.23.11.115004
更新日期:2018-11-01 00:00:00
abstract::A need exists for the continued development of diagnostic tools and methods capable of distinguishing and characterizing slight differences in the optical properties of tissues. We present a method to estimate the scattering coefficient contribution as a function of particle size in complex mixtures of polystyrene sph...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.2363347
更新日期:2006-09-01 00:00:00
abstract::Optical spectroscopy, imaging, and therapy tissue phantoms must have the scattering and absorption properties that are characteristic of human tissues, and over the past few decades, many useful models have been created. In this work, an overview of their composition and properties is outlined, by separating matrix, s...
journal_title:Journal of biomedical optics
pub_type: 杂志文章,评审
doi:10.1117/1.2335429
更新日期:2006-07-01 00:00:00
abstract::Protoporphyrin IX (PpIX)-encapsulated mesoporous silica nanoparticles were synthesized, characterized, and utilized for photodynamic therapy (PDT) of cancer. Silica encapsulation is relatively transparent for activated light and can protect the PpIX against denaturation induced by the extreme bioenvironment. The mesop...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.3083427
更新日期:2009-01-01 00:00:00
abstract::Cochlear implantation offers the potential to restore sensitive hearing in patients with severe to profound deafness. However, surgical placement of the electrode array within the cochlea can produce trauma to sensorineural components, particularly if the initial turn of the cochlea is not successfully navigated as th...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.19.5.057004
更新日期:2014-05-01 00:00:00
abstract::A pilot human study is conducted to evaluate the potential of using diffuse photon density wave (DPDW) methodology at near-infrared (NIR) wavelengths (685 to 830 nm) to monitor changes in tissue hemoglobin concentration in diabetic foot ulcers. Hemoglobin concentration is measured by DPDW in 12 human wounds for a peri...
journal_title:Journal of biomedical optics
pub_type: 临床试验,杂志文章
doi:10.1117/1.3275467
更新日期:2009-11-01 00:00:00
abstract::Ultrasmall scale implants have recently attracted focus as valuable tools for monitoring both acute and chronic diseases. Semiconductor optical technologies are the key to miniaturizing these devices to the long-sought sub-mm scale, which will enable long-term use of these devices for medical applications. This can al...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.20.9.095012
更新日期:2015-09-01 00:00:00
abstract::The conical shape of the tympanic membrane (TM or eardrum) plays an important role in its function, such that variations in shape alter the acoustically induced motions of the TM. We present a method that precisely determines both shape and acoustically induced transient response of the entire TM using the same optics...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.24.3.031008
更新日期:2018-09-01 00:00:00
abstract:SIGNIFICANCE:Detailed biochemical and morphological imaging of the plaque burdened coronary arteries holds the promise of improved understanding of atherosclerosis plaque development, ultimately leading to better diagnostics and therapies. AIM:Development of a dual-modality intravascular catheter supporting swept-sour...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.25.9.096010
更新日期:2020-09-01 00:00:00
abstract::The study presents comparison of near-infrared light propagation and near-infrared backscattered radiation power, as simulated with numerical modeling and measured live in a patient in clinical conditions with the use of the near-infrared transillumination-backscattering sounding (NIR-TBSS) technique. A unique chance ...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.2753756
更新日期:2007-07-01 00:00:00
abstract::Type I collagen is a major component of the extracellular matrix as well as many tissue engineered models. To understand changes in collagen related models over time, it is important to evaluate collagen dynamics with noninvasive techniques. Fluorescence spectroscopy provides a method to noninvasively measure endogeno...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.2360516
更新日期:2006-09-01 00:00:00
abstract::Dispersion encoded full-range (DEFR) frequency-domain optical coherence tomography (FD-OCT) and its enhanced version, fast DEFR, utilize dispersion mismatch between sample and reference arm to eliminate the ambiguity in OCT signals caused by non-complex valued spectral measurement, thereby numerically doubling the usa...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.17.7.077007
更新日期:2012-07-01 00:00:00
abstract::We demonstrate a single-camera imaging system that can simultaneously acquire brightfield, darkfield, and phase contrast images in real time. Our method uses computational illumination via a programmable light-emitting diode (LED) array at the source plane, providing flexible patterning of illumination angles. Brightf...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.19.10.106002
更新日期:2014-01-01 00:00:00
abstract::Near-infrared confocal microendoscopy is a promising technique for deep in vivo imaging of tissues and can generate high-resolution cross-sectional images at the micron-scale. We demonstrate the use of a dual-axis confocal (DAC) near-infrared fluorescence microendoscope with a 5.5-mm outer diameter for obtaining clini...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.17.2.021102
更新日期:2012-02-01 00:00:00
abstract::Abdominal surgeries carry considerable risk of gastrointestinal and intra-abdominal hemorrhage, which could possibly cause patient death. Photoacoustic imaging is one solution to overcome this challenge by providing visualization of major blood vessels during surgery. We investigate the feasibility of in vivo blood ve...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.24.12.121905
更新日期:2019-08-01 00:00:00
abstract::The present work describes the fabrication and characterization of an optical fiber pH sensor using a sol–gel technique. The sensing head configuration is incorporated using a short section of no-core fiber, coated with tetraethyl orthosilicate and spliced at the end of a single mode fiber with a bulge. Different type...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.22.5.057001
更新日期:2017-05-01 00:00:00
abstract::Probing tissue with near-infrared radiation (NIR) simultaneously produces remitted fluorescence and Raman scattering (IE) plus Rayleigh∕Mie light scattering (EE) that noninvasively give chemical and physical information about the materials and objects within. We model tissue as a three-phase system: plasma and red blo...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.3625283
更新日期:2011-09-01 00:00:00
abstract::To evaluate retinal perfusion in the human eye, a dual-wavelength confocal scanning laser ophthalmoscope (cSLO) was developed that provides spectral imaging of the fundus using a combination of red (670 nm) and near-infrared (810 nm) wavelengths. The image of the ocular fundus was analyzed to find out if quantitative ...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.JBO.17.11.116005
更新日期:2012-11-01 00:00:00
abstract::A classifier capable of ranking structural alterations of the cytoskeleton is developed. Images of cytoskeletal microtubules obtained from the epifluorescence microscopy of primary culture rat hepatocytes are analyzed. Morphological descriptors are extracted by contour and mass fractal analysis, direct methods, and sp...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.2187423
更新日期:2006-03-01 00:00:00
abstract::We describe a computer eye model that allows for aspheric surfaces and a three-dimensional computer-based ray-tracing technique to simulate optical properties of the human eye and visual perception under various eye defects. Eye surfaces, such as the cornea, eye lens, and retina, are modeled or approximated by a set o...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.2357734
更新日期:2006-09-01 00:00:00
abstract::We instrumented a combined fluorescence spectroscopy and imaging system to characterize the single- and two-photon excited autofluorescence in epithelial tissue. Single-photon fluorescence (SPF) are compared with two-photon fluorescence (TPF) measured at the same location in epithelial tissue. It was found that the SP...
journal_title:Journal of biomedical optics
pub_type: 杂志文章
doi:10.1117/1.2975866
更新日期:2008-09-01 00:00:00