저자는 미국 심장 협회 (0735136N), 다나 재단, 국립 과학 재단 (CBET/0737731) 및 쿨터 재단에서 지원을 인정합니다.

1. 이미징 설정 <ol><li> 매크로 줌 렌즈와 카메라가 (대신 매크로 줌 렌즈, 현미경의 객관적이고 렌즈 또는 간단한 두 렌즈 시스템은 원하는 배율에 따라 사용할 수의) 수직 단계 또는 수술 현미경을 장착해야합니다. </li><li> 카메라 (제어하는 웹 사이트에서 해당 소프트웨어를 다운로드 <a href="http://bach.bme.utexas.edu/mediawiki/index.php/Software">http://bach.bme.utexas.edu/mediawiki/index.php/Software을</a> ). </li><li> 카메라 소프트웨어는 객체가 원하는 높이에 초점에 확인하는 데 사용해야합니다 </li><li> 분기하는 레이저 빛이 물체를 조명 있도록 콜리 메이션 키트와 레이저 다이오드는 다음 설정해야합니다. </li><li> 레이저 빛이 균일하게 카​​메라의보기의 전체 분야를 조명 있는지 확인합니다 모든 주변 조명을 켜고 아래 / OFF. </li><li> 이 예제에서는 빨간색 레이저 빛이 그것은 시스템을 구축하는 방법을 보여줍니다 쉽게했기 때문에 사용했지만, 적외선 레이저 광은 쉽게 사용할 수 있으며 조직의 깊이를 관통의 추가 이익을 얻을 수 있습니다. 또한, 가시 광선을 차단하기 위해 카메라 앞에 적절한 필터와 적외선은의 객실 조명과 함께 사용할 수 있습니다. </li></ol> 2. 수술 준비 <ol><li> 실험 챔버 윈도우를 사용하여 생존 연구에서 만성 할 수 있지만 이것은 아닌 생존 수술입니다. </li><li> 동물을 마취하고 stereotactic 프레임에 넣습니다. </li><li> 두개골을 둘러싼 피부와 조직을 제거합니다. </li><li> 치과 드릴을 사용하여 얇은 뇌 손상을 방지하기 위해 자주 식염수에 표면을 내리려고주의하고 투명성을 원하는 뇌 영역에 걸쳐 두개골. </li><li> 원하는 지역의 주위에 우물을 만든 다음 가시성을 향상시킬 수있는 우물에 미네랄 오일이나 실리콘 젤 한 방울을 배치 치과 시멘트를 사용합니다. </li><li> 또는, 그 두개골이 제거 될 수 있으며 챔버 창이 여기 만들 수 있습니다. </li></ol> 3. 데이터 수집 <ol><li> 이미지를 획득하며 계산하는 카메라 소프트웨어를 사용 명암 값을 작은 반점을 찍다. </li><li> 카메라의보기의 입력란에 동물을 배치하고 vasculature의 맑은 이미지를 볼 때까지 카메라의 높이 또는 렌즈 초점을 조정할 수 있습니다. </li><li> 충분한 레이저 빛이 포화없이 카메라에 도달되어 있는지 확인합니다. 이미지의 히스토그램을 사용하여 카메라의 픽셀의 대부분이 약 절반 자신의 용량에 기쁘게하기 위해 레이저 파워를 조정합니다. </li><li> 당신이 취득하고자하는 얼마나 많은 실험을 시작하기 전에 할 평균 이미지의 번호를 선택합니다. </li><li> 실험이 시작되면, 혈액 흐름의 변화에​​ 쉽게 관심의 영역을 선택하거나 상대적 혈류의 이미지를 생성하여 모니터링할 수 있습니다. </li></ol> 4. 대표 결과 그림 1은 전형적인 원시 작은 반점 이미지의 예제와 두뇌에 혈액 흐름을 검사하는 소프트웨어를 사용할 때 생성되어야 작은 반점 변환 콘트라스트 이미지를 보여줍니다. 혈액 흐름의 변화를 시각화를위한, 그것은 소프트웨어가 혈류의 상대적인지도를 생성해야하는 것이 더 쉽습니다. 그림 2는보기의 들판을 가로질러 여행 혈액 흐름 과도 증가하는 동안 상대적으로 혈액 흐름을 이미지의 전형적인 시리즈를 보여줍니다. 파란색이 감소를 보여줍니다 반면 붉은 색 혈류 증가를 나타냅니다. 녹색 컬러는 주어진 기준에 비해 혈액 흐름에 변화가 없다는 것을 나타냅니다. <img src="/files/ftp_upload/2004/2004fig1.jpg" alt="그림 1" /> 그림 1. 원시의 예 이미지 (왼쪽) 작은 반점 및 대비 이미지 (오른쪽) 작은 반점을 찍다. <img src="/files/ftp_upload/2004/2004fig2.jpg" alt="그림 2" /> 그림 2. 혈액 흐름이 감소 다음에 혈액 흐름 과도 증가하는 동안 다른 시간 시점에서 여러 관련 혈류 이미지의 예.

<ol>
	<li>Briers, J. D., Fercher, A. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Retinal+blood-flow+visualization+by+means+of+laser+speckle+photography.">Retinal blood-flow visualization by means of laser speckle photography.</a> Invest. Ophthalmol. Vis. Sci. 22, 255-259 (1982).</li><li>Boas, D. A., Dunn, A. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Laser+speckle+contrast+imaging+in+biomedical+optics.">Laser speckle contrast imaging in biomedical optics.</a> J. Biomed. Opt. 15, 011109-011109 (2010).</li><li>Dunn, A. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Simultaneous+imaging+of+total+cerebral+hemoglobin+concentration,+oxygenation,+and+blood+flow+during+functional+activation.">Simultaneous imaging of total cerebral hemoglobin concentration, oxygenation, and blood flow during functional activation.</a> Opt Lett. 28, 28-30 (2003).</li><li>Devor, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Coupling+of+the+cortical+hemodynamic+response+to+cortical+and+thalamic+neuronal+activity.">Coupling of the cortical hemodynamic response to cortical and thalamic neuronal activity.</a> Proc Natl Acad Sci U S A. 102, 3822-3827 (2005).</li><li>Ayata, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pronounced+hypoperfusion+during+spreading+depression+in+mouse+cortex.">Pronounced hypoperfusion during spreading depression in mouse cortex.</a> J Cereb Blood Flow Metab. 24, 1172-1182 (2004).</li><li>Jones, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Simultaneous+multispectral+reflectance+imaging+and+laser+speckle+flowmetry+of+cerebral+blood+flow+and+oxygen+metabolism+in+focal+cerebral+ischemia.">Simultaneous multispectral reflectance imaging and laser speckle flowmetry of cerebral blood flow and oxygen metabolism in focal cerebral ischemia.</a> J. Biomed. Opt. 13, (2008).</li><li>Dunn, A. K., Bolay, H., Moskowitz, M. A., Boas, D. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dynamic+imaging+of+cerebral+blood+flow+using+laser+speckle.">Dynamic imaging of cerebral blood flow using laser speckle.</a> J Cereb Blood Flow Metab. 21, 195-201 (2001).</li><li>Dunn, A. K., Devor, A., Dale, A. M., Boas, D. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Spatial+extent+of+oxygen+metabolism+and+hemodynamic+changes+during+functional+activation+of+the+rat+somatosensory+cortex.">Spatial extent of oxygen metabolism and hemodynamic changes during functional activation of the rat somatosensory cortex.</a> Neuroimage. 27, 279-290 (2005).</li><li>Farkas, E., Bari, F., Obrenovitch, T. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Multi-modal+imaging+of+anoxic+depolarization+and+hemodynamic+changes+induced+by+cardiac+arrest+in+the+rat+cerebral+cortex.">Multi-modal imaging of anoxic depolarization and hemodynamic changes induced by cardiac arrest in the rat cerebral cortex.</a> Neuroimage. 51, 734-742 (2010).</li><li>Sakadzic, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Simultaneous+imaging+of+cerebral+partial+pressure+of+oxygen+and+blood+flow+during+functional+activation+and+cortical+spreading+depression.">Simultaneous imaging of cerebral partial pressure of oxygen and blood flow during functional activation and cortical spreading depression.</a> Appl. Opt. 48, (2009).</li><li>Ponticorvo, A., Dunn, A. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Simultaneous+imaging+of+oxygen+tension+and+blood+flow+in+animals+using+a+digital+micromirror+device.">Simultaneous imaging of oxygen tension and blood flow in animals using a digital micromirror device.</a> Opt Express. 18, 8160-8170 (2010).</li></ol>

관심 없음 충돌 선언하지 않습니다.

이 비디오에서는 그것이 혈액 흐름의 변화를 보면서 대비 이미징 (LSCI) 시스템을 작은 반점 레이저를 구축하고 사용하는 것이 얼마나 쉬운지 보여주있다. LSCI은 망막 1 혈류의지도를 생성하는 방법으로 1980 년대에 개발되었습니다. 정지 영상 망막과 피부 재관류를 사용하지만, 그것은 두뇌 2 이미지 혈액 흐름에 대한 기술로서 매우 인기를 끌고있다. 이 제공하는 탁월한 공간과 시?...

기술 장비의 다양한 사용되는만큼 다목적입니다. 실험을 수행하는 데 필요한 유일한 가지 렌즈, 컨트롤러와 모든 종류의 레이저 다이오드, 그리고 제공되는 소프트웨어와 호환되는 카메라입니다. 동영상에 사용된 특정 장비의 테이블 위에 포함되어 있습니다. 본 실험에서 사용할 수있는 추가 부품의 전체 목록은 웹사이트에서 발견 <a href="http://bach.bme.utexas.edu/mediawiki/index.php/Hardware">http://bach.bme.utexas.edu/mediawiki/index.php/Hardware</a>

how to build a laser speckle contrast imaging (lsci) system to monitor blood flow

레이저 대비 이미징 (LSCI)은 혈액 흐름의 전체 분야 이미징에 사용되는 심플하면서도 강력한 기법입니다 스페클. 이 기술은 레이저 도플러는 입자 속도를 결정하는 주파수 변화를 분석하는 방법과 유사 입자의 움직임을 감지하는 동적인 작은 반점 패턴의 변화를 분석합니다. 그것이 적혈구의 움직임을 모니터하는 데 사용될 수 있기 때문에, LSCI에는 망막, 피부, 뇌 등 조직의 혈액 흐름을 측정하기위한 인기있는 도구가되었습니다. 이 기능 활성화, 뇌졸중, 및 확산 탈분극 같은 생리 이벤트 기간 동안 혈액 흐름 변경 계량 수있는 신경 과학에 특히 유용되고있다. 쉽게 다른 이미징 modalities와 결합 수있는 저렴한 장비를 사용하는 동안은 정말 좋은 공간과 시간적 해상도를 제공하기 때문에 LSCI도 매력적입니다. 여기 LSCI 설정을 구축하고 동물 실험을하는 동안 두뇌에 혈액 흐름의 변화를 모니터하기 위해 능력을 입증하는 방법을 보여줍니다.

Watch this Scientific Journal Video about How to Build a Laser Speckle Contrast Imaging LSCI System to Monitor Blood Flow at JoVE.com

How to Build a Laser Speckle Contrast Imaging LSCI System to Monitor Blood Flow

이 동영상은 쉽게 혈액 흐름을 모니터링하는 데 사용할 수있는 대비 이미징 (LSCI) 시스템을 스페클 레이저를 빌드하는 방법을 보여줍니다.

어떻게 레이저를 작성하는 것은 혈액 흐름을 모니터링하는 콘트라스트 이미징 (LSCI) 시스템 스페클

Laser Speckle Contrast Imaging (LSCI) is a simple yet powerful technique that is used for full-field imaging of blood flow.  The technique analyzes ...

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Research

JoVE Journal

Neuroscience

How to Build a Laser Speckle Contrast Imaging (LSCI) System to Monitor Blood Flow

23.5K 조회수.  University of Texas at Austin. 이 동영상은 쉽게 혈액 흐름을 모니터링하는 데 사용할 수있는 대비 이미징 (LSCI) 시스템을 스페클 레이저를 빌드하는 방법을 보여줍니다.

비디오: How to Build a Laser Speckle Contrast Imaging LSCI System to Monitor Blood Flow

Using Laser Doppler Imaging and Monitoring to Analyze Spinal Cord Microcirculation in Rat

Laser Doppler flowmetry (LDF) is a noninvasive method for blood flow (BF) measurement, which makes it preferable for measuring microcirculatory alterations of the spinal cord. In this article, our goal was to use both Laser Doppler imaging and monitoring to analyze the change of BF after spinal cord injury. Both the laser Doppler image scanner and the probe/monitor were being employed to obtain each readout. The data of LDPI provided a local distribution of BF, which gave an overview of perfusion around the injury site and made it accessible for comparative analysis of BF among different locations. By intensely measuring the probing area over a period of time, a combined probe was used to simultaneously measure the BF and oxygen saturation of the spinal cord, showing overall spinal cord perfusion and oxygen supply. LDF itself has a few limitations, such as relative flux, sensitivity to movement, and biological zero signal. However, the technology has been applied in clinical and experimental study due to its simple setup and rapid measurement of BF.

Here we present a combination of laser Doppler perfusion imaging (LDPI) and laser Doppler perfusion monitoring (LDPM) to measure spinal cord local blood flows and oxygen saturation (SO2), as well as a standardized procedure for introducing spinal cord trauma on rat.

레이저 도플러 이미징 및 모니터링을 사용 하 여 쥐에서 척수 미세 분석 하

Laser Doppler flowmetry (LDF) is a noninvasive method for blood flow (BF) measurement, which makes it preferable for measuring microcirculatory ...

연구

행동분석학

Controlled Microfluidic Environment for Dynamic Investigation of Red Blood Cell Aggregation

Blood, as a non-Newtonian biofluid, represents the focus of numerous studies in the hemorheology field. Blood constituents include red blood cells, white blood cells and platelets that are suspended in blood plasma. Due to the abundance of the RBCs (40% to 45% of the blood volume), their behavior dictates the rheological behavior of blood especially in the microcirculation. At very low shear rates, RBCs are seen to assemble and form entities called aggregates, which causes the non-Newtonian behavior of blood. It is important to understand the conditions of the aggregates formation to comprehend the blood rheology in microcirculation. The protocol described here details the experimental procedure to determine quantitatively the RBC aggregates in microcirculation under constant shear rate, based on image processing. For this purpose, RBC-suspensions are tested and analyzed in 120 x 60 &#181;m poly-dimethyl-siloxane (PDMS) microchannels. The RBC-suspensions are entrained using a second fluid in order to obtain a linear velocity profile within the blood layer and thus achieve a wide range of constant shear rates. The shear rate is determined using a micro Particle Image Velocimetry (&#181;PIV) system, while RBC aggregates are visualized using a high speed camera. The videos captured of the RBC aggregates are analyzed using image processing techniques in order to determine the aggregate sizes based on the images intensities.

The protocol described details an experimental procedure to quantify Red Blood Cell (RBC) aggregates under a controlled and constant shear rate, based on image processing techniques. The goal of this protocol is to relate RBC aggregate sizes to the corresponding shear rate in a controlled microfluidic environment.

적혈구 집계 동적 조사를위한 미세 유체 제어 환경

Blood, as a non-Newtonian biofluid, represents the focus of numerous studies in the hemorheology field. Blood constituents include red blood cells, white ...

생체공학

Implementation of a Nonlinear Microscope Based on Stimulated Raman Scattering

Stimulated Raman scattering (SRS) microscopy uses near-infrared excitation light; therefore, it shares many multi-photon microscopic imaging properties. SRS imaging modality can be obtained using commercial laser-scanning microscopes by equipping with a non-descanned forward detector with proper bandpass filters and lock-in amplifier (LIA) detection scheme. A schematic layout of a typical SRS microscope includes the following: two pulsed laser beams, (i.e., the pump and probe directed in a scanning microscope), which must be overlapped in both space and time at the image plane, then focused by a microscope objective into the sample through two scanning mirrors (SMs), which raster the focal spot across an x-y plane. After interaction with the sample, transmitted output pulses are collected by an upper objective and measured by a forward detection system inserted in an inverted microscope. Pump pulses are removed by a stack of optical filters, whereas the probe pulses that are the result of the SRS process occurring in the focal volume of the specimen are measured by a photodiode (PD). The readout of the PD is demodulated by the LIA to extract the modulation depth. A two-dimensional (2D) image is obtained by synchronizing the forward detection unit with the microscope scanning unit. In this paper, the implementation of an SRS microscope is described and successfully demonstrated, as well as the reporting of label-free images of polystyrene beads with diameters of 3 &#181;m. It is worth noting that SRS microscopes are not commercially available, so in order to take advantage of these characteristics, the homemade construction is the only option. Since SRS microscopy is becoming popular in many fields, it is believed that this careful description of the SRS microscope implementation can be very useful for the scientific community.

In this manuscript, the implementation of a stimulated Raman scattering (SRS) microscope, obtained by the integration of an SRS experimental set-up with a laser scanning microscope, is described. The SRS microscope is based on two femtosecond (fs) laser sources, a Ti-Sapphire (Ti:Sa) and synchronized optical parametric oscillator (OPO).

자극된 라만 산란을 기반으로 한 비선형 현미경 구현

Stimulated Raman scattering (SRS) microscopy uses near-infrared excitation light; therefore, it shares many multi-photon microscopic imaging properties. ...

공학

Image-guided, Laser-based Fabrication of Vascular-derived Microfluidic Networks

This detailed protocol outlines the implementation of image-guided, laser-based hydrogel degradation for the fabrication of vascular-derived microfluidic networks embedded in PEGDA hydrogels. Here, we describe the creation of virtual masks that allow for image-guided laser control; the photopolymerization of a micromolded PEGDA hydrogel, suitable for microfluidic network fabrication and pressure head-driven flow; the setup and use of a commercially available laser scanning confocal microscope paired with a femtosecond pulsed Ti:S laser to induce hydrogel degradation; and the imaging of fabricated microfluidic networks using fluorescent species and confocal microscopy. Much of the protocol is focused on the proper setup and implementation of the microscope software and microscope macro, as these are crucial steps in using a commercial microscope for microfluidic fabrication purposes that contain a number of intricacies. The image-guided component of this technique allows for the implementation of 3D image stacks or user-generated 3D models, thereby allowing for creative microfluidic design and for the fabrication of complex microfluidic systems of virtually any configuration. With an expected impact in tissue engineering, the methods outlined in this protocol could aid in the fabrication of advanced biomimetic microtissue constructs for organ- and human-on-a-chip devices. By mimicking the complex architecture, tortuosity, size, and density of in vivo vasculature, essential biological transport processes can be replicated in these constructs, leading to more accurate in vitro modeling of drug pharmacokinetics and disease.

This protocol outlines the implementation of image-guided, laser-based hydrogel degradation to fabricate vascular-derived, biomimetic microfluidic networks embedded in poly(ethylene glycol) diacrylate (PEGDA) hydrogels. These biomimetic microfluidic systems may be useful for tissue engineering applications, generation of in vitro disease models, and fabrication of advanced "on-a-chip" devices.

혈관 유래 미세 유체 네트워크의 이미지 유도, 레이저 기반의 제조

This detailed protocol outlines the implementation of image-guided, laser-based hydrogel degradation for the fabrication of vascular-derived microfluidic ...

3D 프린팅 품질 최적화를 위한 고분자 역학 시각화

Real-Time Imaging of Bonding in 3D-Printed Layers

In recent times, 3D printing technology has revolutionized our ability to design and produce products, but optimizing the print quality can be challenging. The process of extrusion 3D printing involves pressuring molten material through a thin nozzle and depositing it onto previously extruded material. This method relies on bonding between the consecutive layers to create a strong and visually appealing final product. This is no easy task, as many parameters, such as the nozzle temperature, layer thickness, and printing speed, must be fine-tuned to achieve optimal results. In this study, a method for visualizing the polymer dynamics during extrusion is presented, giving insight into the layer bonding process. Using laser speckle imaging, the plastic flow and fusion can be resolved non-invasively, internally, and with high spatiotemporal resolution. This measurement, which is easy to perform, provides an in-depth understanding of the underlying mechanics influencing the final print quality. This methodology was tested with a range of cooling fan speeds, and the results showed increased polymer motion with lower fan speeds and, thus, explained the poor printing quality when the cooling fan was turned off. These findings show that this methodology allows for optimizing the printing settings and understanding the material behavior. This information can be used for the development and testing of novel printing materials or advanced slicing procedures. With this approach, a deeper understanding of extrusion can be built to take 3D printing to the next level.

저자 스포트라이트: 3D 프린팅 레이어의 접착에 대한 실시간 이미징  

With a non-invasive and real-time technique, nanoscopic polymer motion inside a polymer filament is imaged during 3D printing. Fine-tuning this motion is crucial for producing constructs with optimal performance and appearance. This method reaches the core of plastic layer fusion, thus offering insights into optimal printing conditions and material design criteria.

3D 프린팅 레이어의 결합에 대한 실시간 이미징

In recent times, 3D printing technology has revolutionized our ability to design and produce products, but optimizing the print quality can be ...

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)

While fluorescence imaging is widely used in ophthalmology, a large field of view (FOV) three-dimensional (3D) fluorescence retinal image is still a big challenge with the state-of-the-art retinal imaging modalities because they would require z-stacking to compile a volumetric dataset. Newer optical coherence tomography (OCT) and OCT angiography (OCTA) systems overcome these restrictions to provide three-dimensional (3D) anatomical and vascular images, but the dye-free nature of OCT cannot visualize leakage indicative of vascular dysfunction. This protocol describes a novel oblique scanning laser ophthalmoscopy (oSLO) technique that provides 3D volumetric fluorescence retinal imaging. The setup of the imaging system generates the oblique scanning by a dove tail slider and aligns the final imaging system at an angle to detect fluorescent cross-sectional images. The system uses the laser scanning method, and therefore, allows an easy incorporation of OCT as a complementary volumetric structural imaging modality. In vivo imaging on rat retina is demonstrated here. Fluorescein solution is intravenously injected to produce volumetric fluorescein angiography (vFA).

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT

Here, we present a protocol to get a large field of view (FOV) three-dimensional (3D) fluorescence and OCT retinal image by using a novel imaging multimodal platform. We will introduce the system setup, the method of alignment, and the operational protocols. In vivo imaging will be demonstrated, and representative results will be provided.

복합 체적 망막 이미징 오블리크 스캐닝 레이저 Ophthalmoscopy (오슬로) 및 광학 일관성 단층 촬영 (OCT)

While fluorescence imaging is widely used in ophthalmology, a large field of view (FOV) three-dimensional (3D) fluorescence retinal image is still a big ...

Cerebral Blood Flow-Based Resting State Functional Connectivity of the Human Brain using Optical Diffuse Correlation Spectroscopy

To obtain a comprehensive understanding of the human brain, utilization of cerebral blood flow (CBF) as a source of contrast is desired because it is a key hemodynamic parameter related to cerebral oxygen supply. Resting state low frequency fluctuations based on oxygenation contrast have been shown to provide correlations between functionally connected regions. The presented protocol uses optical diffuse correlation spectroscopy (DCS) to assess blood flow-based resting state functional connectivity (RSFC) in the human brain. Results of CBF-based RSFC in human frontal cortex indicate that intra-regional RSFC is significantly higher in the left and right cortices compared to inter-regional RSFC in both cortices. This protocol should be of interest to researchers who employ multi-modal imaging techniques to study human brain function, especially in the pediatric population.

This protocol demonstrates how to measure resting state functional connectivity in the human prefrontal cortex using a custom-made diffuse correlation spectroscopy instrument. The report also discuss practical aspects of the experiment as well as detailed steps for analyzing the data.

광학 확산 상관 분광법을 사용하여 인간의 뇌의 대뇌 혈류 기반 휴식 상태 기능 적 연결

To obtain a comprehensive understanding of the human brain, utilization of cerebral blood flow (CBF) as a source of contrast is desired because it is a ...

A Novel Approach to Overcome Movement Artifact When Using a Laser Speckle Contrast Imaging System for Alternating Speeds of Blood Microcirculation

The laser speckle contrast imager (LSCI) provides a powerful yet simple technique for measuring microcirculatory blood flow. Ideal for blood dynamic responses, the LSCI is used in the same way as a conventional Laser Doppler Imager (LDI). However, with a maximum skin depth of approximately 1 mm, the LSCI is designed to focus on mainly superficial blood flow. It is used to measure skin surface areas of up to 15 cm x 20 cm. The new technique introduced in this paper accounts for alternating speeds of microcirculations; i.e. both slow and fast flow flux measurement using the LSCI. The novel technique also overcomes LSCI&#39;s biggest shortcoming, which is high sensitivity to artifact movement. An adhesive opaque patch (AOP) is introduced for satisfactory recording of microcirculatory blood flow, by subtracting the LSCI signal from the AOP from the laser speckle skin signal. The optimal setting is also defined because the LSCI is most powerful when flux changes are measured relative to a reference baseline, with blood microcirculatory flux expressed as a percentage change from the baseline. These changes may be used for analyzing the status of the blood flow system.

This study introduces a novel technique for the measurement and analysis of alternating speeds of blood microcirculation in a single experiment using a laser speckle contrast imager.

레이저 반점 대비 미세 혈액의 속도 번갈아 위한 이미징 시스템을 사용 하는 경우 운동 유물을 극복 하는 새로운 접근 방식

The laser speckle contrast imager (LSCI) provides a powerful yet simple technique for measuring microcirculatory blood flow. Ideal for blood dynamic ...

어떻게 레이저를 작성하는 것은 혈액 흐름을 모니터링하는 콘트라스트 이미징 (LSCI) 시스템 스페클

요약

더 많은 비디오 탐색

이 비디오의 챕터

레이저 도플러 이미징 및 모니터링을 사용 하 여 쥐에서 척수 미세 분석 하

적혈구 집계 동적 조사를위한 미세 유체 제어 환경

자극된 라만 산란을 기반으로 한 비선형 현미경 구현

혈관 유래 미세 유체 네트워크의 이미지 유도, 레이저 기반의 제조

3D 프린팅 레이어의 결합에 대한 실시간 이미징

3D 프린팅 레이어의 결합에 대한 실시간 이미징

3D 프린팅 레이어의 결합에 대한 실시간 이미징

복합 체적 망막 이미징 오블리크 스캐닝 레이저 Ophthalmoscopy (오슬로) 및 광학 일관성 단층 촬영 (OCT)

광학 확산 상관 분광법을 사용하여 인간의 뇌의 대뇌 혈류 기반 휴식 상태 기능 적 연결

레이저 반점 대비 미세 혈액의 속도 번갈아 위한 이미징 시스템을 사용 하는 경우 운동 유물을 극복 하는 새로운 접근 방식