image intendifier

The image intensifier  is the detector used in fluoroscopy, where an X-ray beam is continually applied to visualize movement in a real-time manner. X rays that interact with the input phosphor (usually CsI) release visible light photons. CsI crystals are grown as tiny pins, which, when arranged in the phosphor, provide very high resolution. Released photons from the input phosphor interact with the photocathode by a process called photoemission, which results in the release of electrons. These electrons are pulled toward the anode by 20 kV at the other end of the tube, and guided by electrostatic lenses to be focused on the output phosphor. Visible light photons released by the output phosphor may be recorded by a video camera or charge-coupled device (CCD)
camera.

Working Principle

X rays that hit the input phosphor of an image-intensifier tube release visible light. Light
photons react with the photocathode to produce electrons, which are guided to the anode by
electrostatic lenses. Electrons that hit the output phosphor, in turn, emit visible light, which may be
recorded by a video camera.

 source biomedic.me

Comments

Post a Comment

Popular posts from this blog

what is biosensor?

Image
 What is biosensor? A biosensor is a device that uses a biological component (such as enzymes, antibodies, or DNA) to detect and measure specific molecules or compounds in a sample. Biosensors have a wide range of applications in medicine, environmental monitoring, and industrial processes, among others. One of the most common types of biosensors is the enzyme-based biosensor. These biosensors use enzymes as the biological component to detect and measure specific molecules in a sample. For example, glucose biosensors use enzymes that specifically catalyze the oxidation of glucose, and the resulting electrical signal can be used to measure the glucose concentration in a sample. Enzyme-based biosensors are commonly used in medical applications, such as monitoring glucose levels in people with diabetes. Another type of biosensor is the antibody-based biosensor. These biosensors use antibodies as the biological component to detect and measure specific molecules in a sample. Antibodies can
Read more

What is electrocardiography? how to diagnose?

Image
 What is electrocardiography? how to diagnose?  Electrocardiography (ECG or EKG) is a diagnostic test that records the electrical activity of the heart. The test is used to evaluate the heart's electrical activity and rhythm, and to diagnose and evaluate conditions such as heart attacks, arrhythmias, and heart disease. ECG test is performed by attaching electrodes to the skin of the chest, arms, and legs. The electrodes are connected to an ECG machine, which records the electrical activity of the heart. The test is usually done while the patient is lying down, and it takes about 5-10 minutes to complete. The ECG tracing, which is a graph of the heart's electrical activity, is analyzed by a healthcare professional. The tracing shows the electrical activity of the heart as it goes through its normal cycle of contraction and relaxation. The healthcare professional can use this information to diagnose and evaluate conditions such as: Heart attacks: A heart attack occurs when the bl
Read more

Simple manuscript on biomedical image processing

 Simple manuscript on biomedical image processing Introduction: Biomedical image processing is an important field in medical research and clinical practice. The ability to analyze and interpret medical images is crucial for accurate diagnosis, disease staging, and treatment planning. This manuscript provides an overview of the methods and techniques used in biomedical image processing. Image Acquisition: The first step in biomedical image processing is image acquisition. Medical images are typically acquired using various imaging modalities such as X-ray, computed tomography (CT), magnetic resonance imaging (MRI), ultrasound, and positron emission tomography (PET). The images are then digitized and stored as digital image files. Image Enhancement: Image enhancement techniques are used to improve the quality of medical images. These techniques include contrast enhancement, noise reduction, and image restoration. Contrast enhancement improves the visibility of image features, while noise
Read more