Perfusion CT, or Perfusion Computed Tomography, is an advanced imaging technique used to assess blood flow (perfusion) in various tissues, most commonly in the brain and tumors. It combines standard CT imaging with the use of a contrast agent to visualize blood flow dynamics in real-time.
The term "Phantom structure" can refer to different concepts depending on the context in which it is used. Here are a few areas where the term might apply: 1. **Architecture and Design**: In some architectural discussions, "phantom structures" refer to designs or structures that appear to have a presence or significance but do not actually exist in a physical form. This can be a conceptual tool for discussing the impact of visibility, presence, or absence in design.
Phase space measurement with forward modeling is a concept often used in scientific fields such as physics, engineering, and data science, particularly in analyzing dynamic systems. To understand this concept, it helps to break down the components involved: ### Phase Space 1. **Phase Space**: - In physics, particularly in the context of dynamical systems, phase space is a multidimensional space wherein each possible state of a system is represented as a point.
Photoacoustic imaging (PAI) is a hybrid imaging technique that combines optical and ultrasound imaging principles. The method relies on the photoacoustic effect, which occurs when a material absorbs light (usually from a pulsed laser) and subsequently emits acoustic waves (ultrasound) due to thermal expansion.
Photoactivated localization microscopy (PALM) is a super-resolution imaging technique used in fluorescence microscopy to achieve spatial resolution beyond the diffraction limit of light. This technique is particularly important for visualizing cellular structures and protein interactions at the nanometer scale. Here's how it works: 1. **Photoactivation**: In PALM, a population of fluorescent molecules is initially in a dark or non-fluorescent state.
A photographic plate is an early medium used for capturing images, primarily in photography before the advent of modern film. It consists of a glass or metal plate coated with a light-sensitive material, usually a silver halide emulsion. When exposed to light, the emulsion undergoes a chemical change that creates a latent image, which can then be developed into a visible photograph through various chemical processing techniques.
Portable magnetic resonance imaging (MRI) refers to compact, mobile MRI systems designed to provide MRI capabilities outside of traditional hospital settings. These systems aim to make MRI technology more accessible, allowing for imaging in various locations such as clinics, outpatient diagnostic centers, emergency departments, or even in patients' homes. Key features of portable MRI systems typically include: 1. **Size and Weight**: Unlike conventional MRI machines, portable MRIs are smaller and can be moved more easily. This allows for more flexible deployment.
As of my last knowledge update in October 2023, Positron Corporation is a company that focuses on developing and commercializing medical imaging technologies, particularly in the field of Positron Emission Tomography (PET). PET is a powerful imaging technique used primarily in oncology, cardiology, and neurology to visualize metabolic processes in the body.
RTI-121 is an investigational drug that has been studied as a potential treatment for certain neurological disorders, particularly related to cognitive impairment and related conditions. It acts as a selective modulator of the mGluR2 receptor, which is part of the metabotropic glutamate receptor family. Research into RTI-121 has primarily focused on its effects in the context of treating conditions like schizophrenia and other disorders characterized by cognitive deficits.
RTI-229 is an investigational medication related to the treatment of certain neurodegenerative diseases, specifically targeting conditions like Alzheimer's disease. It is a small molecule that is designed to interfere with the aggregation of amyloid-beta peptides, which are believed to play a significant role in the pathogenesis of Alzheimer’s disease. By potentially preventing or reducing this aggregation, RTI-229 may help alleviate some of the cognitive decline associated with Alzheimer's.
RTI-32 can refer to different things depending on the context, but it is commonly related to the field of computer graphics and visual rendering, specifically in reference to a Render Target Interface used in graphics programming. In some contexts, it may refer to a specific model or standard within an organization dealing with technology or data interchange standards, possibly related to the 32-bit architecture or specific applications associated with real-time interaction or rendering.
RTI-51 is a designation that can refer to various things depending on the context, but it is primarily associated with specific research and development projects or materials in scientific, industrial, or technological fields. Without further context, it's difficult to pinpoint a specific definition. It could involve an identifier for a research initiative, a type of technology, or an experimental program.
RTI-55, also known as RTI-55-356, is a synthetic cannabinoid that is part of a class of compounds designed to mimic the effects of tetrahydrocannabinol (THC), the main psychoactive component of cannabis. These synthetic cannabinoids are often used in research and sometimes found in illicit drug markets labeled as "spice" or "K2.
A Region of Interest (ROI) refers to a specific subset of data or an area within an image, video, or dataset that is of particular significance for analysis, processing, or observation. The concept of ROI is widely used across various fields, including medical imaging, computer vision, image processing, and data analysis.
Resting state functional magnetic resonance imaging (rs-fMRI) is a neuroimaging technique used to measure brain activity when a subject is not engaged in any specific cognitive task or external stimuli. Instead of performing tasks, participants typically lie still in the scanner with their eyes closed or open, allowing researchers to capture the brain's intrinsic activity patterns.
Right heart strain refers to the increased workload and stress placed on the right side of the heart, often as a result of certain medical conditions that affect the pulmonary circulation or right ventricular function. When the right heart is strained, it has difficulty pumping blood efficiently to the lungs, leading to various symptoms and complications. ### Causes of Right Heart Strain 1. **Pulmonary Hypertension:** Elevated blood pressure in the pulmonary arteries can make it difficult for the right ventricle to eject blood.
Roentgen stereophotogrammetry (RSA) is a precise imaging technique used primarily in the field of medical imaging and biomechanics, particularly for analyzing the motion and position of implants and bones in three-dimensional space. It involves the use of X-ray images to capture the position of markers placed on or within the body, typically around surgical implants, such as joint replacements.
Rotational angiography is a medical imaging technique used primarily in interventional radiology and cardiology to obtain detailed three-dimensional (3D) images of blood vessels. This technique involves the use of advanced imaging equipment, typically a C-arm fluoroscope, to capture a series of 2D images of the vascular system from multiple angles as the imaging device rotates around the patient.
A semiconductor detector is a type of radiation detector that uses semiconductor materials to detect and measure ionizing radiation, such as alpha particles, beta particles, gamma rays, and X-rays. These detectors operate based on the principle that when ionizing radiation interacts with the semiconductor material, it generates electron-hole pairs (electrons and the absence of electrons, which acts as positive charges).
Single photon absorptiometry (SPA) is a nuclear medicine technique used to measure the density of various substances within a material, most commonly bone mineral density (BMD). The technique is based on the principle of photon absorption, where a single photon emitted from a radioactive source is absorbed by the material being studied. In the context of bone density measurement, a radioactive source typically emits gamma rays, and the amount of radiation that passes through the bone is measured.