The present disclosure relates to methods and systems for image analysis. The method may include obtaining a plurality of image sequences relating to a blood vessel. At least one of the plurality of image sequences may be acquired using a black blood imaging sequence. The method may also include determining a plurality of aligned image sequences by aligning, based on a reference image sequence of the plurality of image sequences, the plurality of image sequences, determining a target region based on the plurality of aligned image sequences, and determining one or more target parameters based on the target region.

In an embodiment, cross sectional image storage stores a cross sectional image group including multiple cross sectional images each of which is associated with time. Phase image storage stores a phase image group including multiple phase images each of which is associated with time. Blood flow information storage stores a blood flow information group including multiple blood flow information each of which is related to blood flow in a blood vessel of the living body and is associated with time. Display synchronously displays a cross sectional image included in the cross sectional image group and a phase image included in the phase image group using time associated with the cross sectional image and the phase image, and displays a blood flow image that expresses multiple blood flow information. The display performs the same change as the change to the cross sectional image, the phase image and the blood flow image.

A method for evaluating image quality is provided. The method may include: obtaining an image, the image including a plurality of elements, each element of the plurality of elements being a pixel or voxel, each element having a gray level; determining, based on a maximum gray level of the plurality of elements, one or more thresholds for segmenting the image; determining one or more sub-images of a region of interest by segmenting, based on the one or more thresholds, the image; and determining, based on the one or more sub-images of the region of interest, a quality index for the image.

An imaging system includes a light source for emitting visible light and infrared light and a camera head unit configured to capture visible light image data so as to generate a visible light image frame and configured to capture infrared image data so as to generate an infrared image frame. A camera control unit is configured to extract a structural data from the visible light image frame. The camera control unit is further configured to apply the structural data to the infrared image frame so as to enhance the infrared image with structural data.

A device includes an illumination device that casts light of a prescribed polarization direction on a scattering body, a camera that picks up images of the scattering body at a plurality of different polarization angles, and a processor that executes a process of generating and outputting an inner layer image, of an inner layer of an inside of the scattering body, in response to a depth from a surface of the scattering body on the basis of the images of the scattering body picked up at the plurality of different polarization angles.

A blood vessel visualization apparatus, a blood vessel puncture system, and an observation window member include: light sources that irradiate with near infrared light a visualization target site; an observation window that contains a wavelength conversion material for converting the near infrared light into visible light; a frame member that holds the observation window; and support members that support the frame member apart from the visualization target site. The observation window visualizes an image of near infrared light radiated from the light sources and reflected by the visualization target site.

Hyperspectral, fluorescence, and laser mapping imaging with a minimal area image sensor are disclosed. A system includes an emitter for emitting pulses of electromagnetic radiation and an image sensor comprising a pixel array for sensing reflected electromagnetic radiation, wherein the pixel array comprises active pixels and optical black pixels. The system includes a black clamp circuit providing offset control for data generated by the pixel array. The system is such that at least a portion of the pulses of electromagnetic radiation emitted by the emitter comprises one or more of: electromagnetic radiation having a wavelength from about 513 nm to about 545 nm; electromagnetic radiation having a wavelength from about 565 nm to about 585 nm; electromagnetic radiation having a wavelength from about 900 nm to about 1000 nm; an excitation wavelength of electromagnetic radiation that causes a reagent to fluoresce; or a laser mapping pattern.

A detection system can include a device, a circuit, and at least one indicator. The device can include polymer needle having a distal end and a proximal end. A needle lumen can be extended along a longitudinal axis of the polymer needle. The distal end can include an insertion tip. An elongate sleeve can include a first end and a second end. The polymer needle can be located within an inner bore of the elongate sleeve. The insertion tip of the polymer needle can be disposed at a distance from the elongate sleeve. A first electrode can be coupled to the device and a second electrode can be electrically isolated from the first electrode. The circuit can be configured to provide a signal based on an electrical characteristic between the first electrode and the second electrode. At least one indicator can be communicatively coupled to the circuit and configured to provide an output based on the signal.

Systems are provided for detecting the flow of blood or other fluids in biological tissue by illuminating the biological tissue with a coherent light source and detecting time-varying patterns of constructive and destructive interference in light received from portions of the biological tissue by an imager. The movement of blood cells and other light-scattering elements in the biological tissue causes transient, short-duration changes in light emitted from portions of the biological tissue proximate to the moving blood cells or other scatterers. High-frequency sampling or other high-bandwidth processing of light intensities detected by an imager could be used to determine the flow of blood or other fluids at a plurality of points in the biological tissue, to detect and/or localize a tumor in the biological tissue, to determine the location, pattern, width, or other properties of vasculature in the biological tissue, or to provide information for some other application(s).

Devices, systems, and methods are described including an invasive medical device with a magnetic region. The magnetic region can include a discontinuity in the magnetic region providing a diameter transition, a plurality of spaced magnetic regions can be provided or the magnetic regions can be encoded with data. Systems and methods are described that include ways to read the data.