Cathode Ray Tube
Data Display
Computer Terminals
Electrodes
Bioelectric Energy Sources
[Effect of ambient light variations on luminance ratio of CRT monitor and image contrast in ultrasonography]. (1/6)
Variation in the luminance ratio of a cathode ray tube(CRT)monitor and the ultrasonographic images at different levels of ambient light(0-150 lux)was investigated to obtain optimum ambient light in the ultrasonography suite. The maximum and minimum luminances of test patterns and ultrasonographic images were measured after three technicians independently optimized the brightness and contrast of the CRT monitor and ultrasonographic images at different levels of ambient light. Furthermore, the luminance ratio was calculated from the maximum luminance divided by the minimum luminance. When ambient light increased, it was difficult for the technicians to optimize the brightness and contrast settings of the CRT monitor to maintain a high luminance ratio at 0 lux. The luminance ratio decreased rapidly as ambient light increased up to 20 lux. However, the luminance ratio decreased gradually when ambient light was higher than 20 lux. It is necessary to take into consideration the ambient light to maintain a high luminance ratio of ultrasonographic images. (+info)Neural response dynamics of spiking and local field potential activity depend on CRT monitor refresh rate in the tree shrew primary visual cortex. (2/6)
(+info)Detection of changes in luminance distributions. (3/6)
(+info)Temporal properties of liquid crystal displays: implications for vision science experiments. (4/6)
(+info)Assessment of age changes and repeatability for computer-based rod dark adaptation. (5/6)
(+info)Evaluation of an organic light-emitting diode display for precise visual stimulation. (6/6)
(+info)A Cathode Ray Tube (CRT) is a vacuum tube that contains one or more electron guns and a fluorescent screen used to view images. In a CRT, the electron gun emits a beam of electrons that are accelerated towards the fluorescent screen. The electrons strike the phosphor-coated screen, causing it to emit light and create images.
CRTs were commonly used in older television sets and computer monitors before being replaced by flat-panel displays such as LCDs and plasmas. CRTs are still used in some medical equipment, such as cathode ray oscilloscopes and X-ray imaging systems.
I couldn't find a medical definition specific to "data display," but I can provide some information related to the visual representation of medical data.
In healthcare and research, data displays are graphical representations of data designed to facilitate understanding, communication, and interpretation of complex information. These visualizations can include various types of charts, graphs, tables, and infographics that present medical data in a more accessible and easily digestible format. Examples of data displays in a medical context may include:
1. Line graphs: Used to show trends over time, such as changes in a patient's vital signs or the progression of a disease.
2. Bar charts: Employed to compare categorical data, like the frequency of different symptoms across various patient groups.
3. Pie charts: Utilized to illustrate proportions or percentages of different categories within a whole, such as the distribution of causes of death in a population.
4. Scatter plots: Applied to display relationships between two continuous variables, like the correlation between age and blood pressure.
5. Heat maps: Used to represent density or intensity of data points across a two-dimensional space, often used for geographical data or large datasets with spatial components.
6. Forest plots: Commonly employed in systematic reviews and meta-analyses to display the effect sizes and confidence intervals of individual studies and overall estimates.
7. Flow diagrams: Used to illustrate diagnostic algorithms, treatment pathways, or patient flow through a healthcare system.
8. Icon arrays: Employed to represent risks or probabilities visually, often used in informed consent processes or shared decision-making tools.
These visual representations of medical data can aid in clinical decision-making, research, education, and communication between healthcare professionals, patients, and policymakers.
A computer terminal is a device that enables a user to interact with a computer system. It typically includes an input device, such as a keyboard or a mouse, and an output device, such as a monitor or a printer. A terminal may also include additional features, such as storage devices or network connections. In modern usage, the term "computer terminal" is often used to refer specifically to a device that provides text-based access to a computer system, as opposed to a graphical user interface (GUI). These text-based terminals are sometimes called "dumb terminals," because they rely on the computer system to perform most of the processing and only provide a simple interface for input and output. However, this term can be misleading, as many modern terminals are quite sophisticated and can include features such as advanced graphics capabilities or support for multimedia content.
Liquid crystals (LCs) are not exclusive to the medical field, but they do have important applications in medicine, particularly in the development of display technologies for medical devices. Here is a general definition:
Liquid crystals are a state of matter that possess properties between those of conventional liquids and solid crystals. They can flow like liquids but have molecules oriented in a way that they can reflect light, creating birefringence. This unique property makes them useful in various applications, such as LCDs (liquid crystal displays) found in many electronic devices, including medical equipment.
In the context of medicine, liquid crystals are primarily used in LCD screens for medical devices like monitors, imaging systems, and diagnostic equipment. They enable high-resolution, clear, and adjustable visualization of medical images, which is crucial for accurate diagnosis and treatment planning.
An electrode is a medical device that can conduct electrical currents and is used to transmit or receive electrical signals, often in the context of medical procedures or treatments. In a medical setting, electrodes may be used for a variety of purposes, such as:
1. Recording electrical activity in the body: Electrodes can be attached to the skin or inserted into body tissues to measure electrical signals produced by the heart, brain, muscles, or nerves. This information can be used to diagnose medical conditions, monitor the effectiveness of treatments, or guide medical procedures.
2. Stimulating nerve or muscle activity: Electrodes can be used to deliver electrical impulses to nerves or muscles, which can help to restore function or alleviate symptoms in people with certain medical conditions. For example, electrodes may be used to stimulate the nerves that control bladder function in people with spinal cord injuries, or to stimulate muscles in people with muscle weakness or paralysis.
3. Administering treatments: Electrodes can also be used to deliver therapeutic treatments, such as transcranial magnetic stimulation (TMS) for depression or deep brain stimulation (DBS) for movement disorders like Parkinson's disease. In these procedures, electrodes are implanted in specific areas of the brain and connected to a device that generates electrical impulses, which can help to regulate abnormal brain activity and improve symptoms.
Overall, electrodes play an important role in many medical procedures and treatments, allowing healthcare professionals to diagnose and treat a wide range of conditions that affect the body's electrical systems.
Bioelectric energy sources refer to the electrical energy generated through biological processes within living organisms. This energy is produced by the conversion of chemical energy into electrical energy, typically through the use of cell membranes and ions. A common example of a bioelectric energy source is the action potential generated by nerve cells, or neurons, in order to communicate signals throughout the body. Another example is the electrical energy generated by cardiac muscle cells during each heartbeat. These endogenous electrical signals can be harnessed and used for various medical and therapeutic purposes, such as in the use of pacemakers and cochlear implants. Additionally, there is ongoing research into developing bioelectric devices that can interface with living tissues to monitor or manipulate biological processes, such as tissue regeneration and cancer treatment.
Electricity is not a medical term, but rather a fundamental aspect of physics and science. It refers to the form of energy resulting from the existence of charged particles such as electrons or protons, either statically as an accumulation of charge or dynamically as a current.
However, in the context of medical procedures and treatments, electricity is often used to stimulate nerves or muscles, destroy tissue through processes like electrocoagulation, or generate images of internal structures using methods like electrocardiography (ECG) or electroencephalography (EEG). In these cases, a clear medical definition would be:
The use of electric currents or fields in medical procedures for therapeutic or diagnostic purposes.
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Anode19
- The introduction of hot cathodes allowed for lower acceleration anode voltages and higher electron beam currents, since the anode now only accelerated the electrons emitted by the hot cathode, and no longer had to have a very high voltage to induce electron emission from the cold cathode. (wikipedia.org)
- The acceleration anode has a small cut in the center so that the electrons can pass through and also has a high positive potential of 1 up to 20kV to the cathode. (steemit.com)
- The potential difference of the anode and cathode creates an electric field that goes from the anode to the cathode (right to left). (steemit.com)
- The electrons that leave the cathode have different directions and so to focus them into a single beam a focussing anode is being used. (steemit.com)
- where Vab is of course the potential difference of the anode to the cathode. (steemit.com)
- The mass and charge of an electron are of course constant and so the only thing that velocity and kinetic energy depend on is the potential difference V when inside of the electric field of the anode and cathode. (steemit.com)
- After leaving the anode and so the electric field of the anode and cathode the electron is now in the area of the vertical deflection plates. (steemit.com)
- where V2 is the potential difference of the vertical deflection plates and V1 is the potential difference of the 'first' electric field of the anode-cathode. (steemit.com)
- It consists of a heater, a cathode, pre-accelerating anode, accelerating anode which emits electrons and forms them into a beam. (electronicscoach.com)
- The CRT is composed of a cathode and an anode. (culturalheritage.org)
- The following are some details to help understand the relationship between the phosphor coating and the coils visible on the neck: The terms anode and cathode are used in electronics as synonyms for positive and negative terminals. (culturalheritage.org)
- For example, one could refer to the positive terminal of a battery as the anode and the negative terminal as the cathode. (culturalheritage.org)
- As electrons are negative and the anode positive, it attracts the electrons pouring off the cathode. (culturalheritage.org)
- In a cathode ray tube, the stream of electrons is focused, by a focusing anode, into a tight beam and then accelerated by an accelerating anode. (culturalheritage.org)
- Just like most people use positive and negative when referring to a battery, the word anode and cathode are used as well. (tech-faq.com)
- Anode refers to being positive, cathode means being negative. (tech-faq.com)
- Electrons are negative in charge (cathode), and they seek a positive charge (anode). (tech-faq.com)
- The electrons are drawn to a focusing anode inside the CRT tube and create a tight beam that is extremely fast. (tech-faq.com)
- Electrons move from the cathode to the anode because they have a negative electrical charge. (infoplease.com)
Electrode3
- Hittorf observed that some unknown rays were emitted from the cathode (negative electrode) which could cast shadows on the glowing wall of the tube, indicating the rays were traveling in straight lines. (wikipedia.org)
- The cathode ray tubes use an electron beam , that is also called an cathode ray, because it originates from the cathode (negativelly charged electrode or electricity conductor) of an vacuum light bulb. (steemit.com)
- The fabricated Mo-tip FEA was mounted on the base plate and then the cathode part and focusing electrode part was assembled using the electrical-welding method. (korea.ac.kr)
CRTs2
- The circuit boards driving the CRTs have evolved dramatically since their creation going from vacuum tube based circuitry, to solid-state capacitors, advanced printed circuit boards and to IC chip driven circuitry. (culturalheritage.org)
- CRTs are vacuum devices therefore the phosphor screen and cathode have minimal change during storage. (culturalheritage.org)
Electrons emitted1
- The number of electrons emitted from the cathode is controlled by the grid. (electronicscoach.com)
Fluorescent screen2
- A vacuum tube equipped with an electron emitting CATHODE and a fluorescent screen which emits visible light when excited by the cathode ray. (lookformedical.com)
- Cathode ray tube, CRT is the heart of CRO which generates images when electron beam from the back of the tube strikes the fluorescent screen with sufficient energy. (electronicscoach.com)
Bulky2
- LCD screens have replaced heavy, bulky and less energy-efficient cathode-ray tube (CRT) displays in nearly all applications. (wikipedia.org)
- Early electronic television sets were large and bulky, with analog circuits made of vacuum tubes . (wikipedia.org)
Stream of electrons3
- The "ray" is a stream of electrons that naturally pour off a heated cathode into the vacuum. (culturalheritage.org)
- Cathode stands for the filament in a glass tube, the ray from 'cathode ray tube' stands for the stream of electrons that are created and that stream from the filament. (tech-faq.com)
- Getting back to the cathode ray tube, when the filament heats up and the ray, which is the stream of electrons are created. (tech-faq.com)
Beam5
- The term cathode ray was used to describe electron beams when they were first discovered, before it was understood that what was emitted from the cathode was a beam of electrons. (wikipedia.org)
- The intensity by which beam of electron moves depends entirely on the electron emitted from the cathode. (electronicscoach.com)
- This tight, high-speed beam of electrons flies through the vacuum in the tube and hits the flat phosphor coated screen at the other end of the tube. (culturalheritage.org)
- These coils, through an electrical input, are able to create magnetic fields inside the tube, and the electron beam responds to the fields. (culturalheritage.org)
- In the case of a black and white CRT display, the same principles apply except that a single electron beam is projected from the cathode, the phosphor coating is monochromatic, and shades of gray are generated through the brightness circuit triggered by the originating signal. (culturalheritage.org)
Luminance1
- Variation in the luminance ratio of a cathode ray tube(CRT)monitor and the ultrasonographic images at different levels of ambient light(0-150 lux)was investigated to obtain optimum ambient light in the ultrasonography suite. (lookformedical.com)
Negatively charged2
- In 1897, J. J. Thomson succeeded in measuring the charge-mass-ratio of cathode rays, showing that they consisted of negatively charged particles smaller than atoms, the first "subatomic particles", which had already been named electrons by Irish physicist George Johnstone Stoney in 1891. (wikipedia.org)
- The term cathode refers to the negatively charged plate inside of a cathode ray tube, or CRT. (infoplease.com)
Diode1
- It was a cold-cathode diode, a modification of the Crookes tube with a phosphor-coated screen. (wikipedia.org)
TELEVISIONS3
- Today we continue with Electromagnetism to get into an explanation of how Cathode ray tubes work , whose technology is used in oscilloscopes and older televisions and monitors. (steemit.com)
- [7] The earliest commercially made televisions were radios with the addition of a television device consisting of a neon tube behind a mechanically spinning disk with a spiral of apertures that produced a red postage-stamp size image, enlarged to twice that size by a magnifying glass. (wikipedia.org)
- Employee manually dismantling cathode ray tubes from televisions. (cdc.gov)
Heats1
- A CRT works by electrically heating a tungsten coil which in turn heats a cathode in the rear of the CRT, causing it to emit electrons which are modulated and focused by electrodes. (wikipedia.org)
NIOSH1
- NIOSH investigators noted that the local exhaust ventilation equipment at work, and he reported playing with his children system at the cathode ray tubes crushing operation recircu- when he came home. (cdc.gov)
Filament4
- In a cathode ray tube, the "cathode" is a heated filament, not unlike the filament in a normal light bulb. (culturalheritage.org)
- The heated filament is in a vacuum created inside a glass "tube. (culturalheritage.org)
- Inside a cathode ray tube, there is a filament that is heated up, just like your ordinary, everyday light bulb. (tech-faq.com)
- However, the filament is heated up in a vacuum inside a glass tube instead of a glass light bulb. (tech-faq.com)
Rays6
- Cathode rays were discovered by Julius Plücker and Johann Wilhelm Hittorf. (wikipedia.org)
- In 1890, Arthur Schuster demonstrated cathode rays could be deflected by electric fields, and William Crookes showed they could be deflected by magnetic fields. (wikipedia.org)
- Before scientists knew about particles, most believed that electromagnetic radiation was some type of rays-such as x-rays, cathode rays, etc. (infoplease.com)
- In 1897, J.J. Thompson, a young English physicist, had been performing a number of experiments with cathode rays, trying to find out if they were really particles. (infoplease.com)
- He built a simple apparatus in which the cathode rays were directed across a region between two electrically charged plates, and in this region there was also a magnetic field. (infoplease.com)
- The important result that Thompson obtained was that the cathode rays were particles and that they were attracted toward a positively charged plate. (infoplease.com)
Electron beams2
- A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. (wikipedia.org)
- The cathode or "electron gun" shoots out three electron beams. (culturalheritage.org)
Consists1
- A modern desktop liquid crystal display (LCD) computer-screen consists of an active-matrix panel and polarizers (which together act as an electrically-controlled pixel-level light filter) situated immediately in front of a backlight (large-area uniform light source - usually consisting of one to four cold-cathode florescent lamps (CCFL) or now LEDs, a lightguide and diffuser). (techmind.org)
Display6
- Braun was the first to conceive the use of a CRT as a display device.The Braun tube became the foundation of 20th century television. (wikipedia.org)
- I'd rate this a 10 on the hack scale, but the reality is that you can get nos 1″ crt tubes on ebay for just a couple of bucks that will certainly provide a better display. (hackaday.com)
- Performs any combination of following tasks to assemble cathode-ray tubes used in television and display equipment: Removes funnel from rack and places funnel onto conveyorized washing, rinsing, and drying equipment. (occupationalinfo.org)
- An example is when data is called from the computer and transmitted to a CATHODE RAY TUBE DISPLAY or LIQUID CRYSTAL display. (lookformedical.com)
- In 1926, Kenjiro Takayanagi demonstrated the first TV system that employed a cathode ray tube (CRT) display, at Hamamatsu Industrial High School in Japan. (wikipedia.org)
- Here are some basic descriptions of how a CRT is composed and functions: A CRT display-unit is composed usually of an outer case and, inside the case, an array of components of which the main part is a glass tube called a Cathode Ray Tube (CRT) and electronic circuit boards which drive the CRT, providing power and signal. (culturalheritage.org)
Physicist1
- The earliest version of the CRT was known as the "Braun tube", invented by the German physicist Ferdinand Braun in 1897. (wikipedia.org)
Wires2
- The neck of the CRT tube is wrapped in coils of wires. (culturalheritage.org)
- This involves placing the source of radiation directly within the tumor and employs radioactive plaques, needles, tubes, wires, or small 'seeds' made of radionuclides. (geographyfieldwork.com)
Commonly2
- A CRT on a television set is commonly called a picture tube. (wikipedia.org)
- Most TV's in use today use a cathode ray tube, commonly referred to as a CRT (Please note that digital TV's such as LCD and Plasma use other technologies). (tech-faq.com)
Conventional1
- The conventional thermionic cathode was replaced with a cold cathode and the Mo-tip FEA was applied to the electron gun of the CRT. (korea.ac.kr)
Vacuum tubes2
- As an example, the RCA CT-100 color TV set used 36 vacuum tubes. (wikipedia.org)
- H03K4/20 - Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth voltage is produced across a capacitor using a tube with negative feedback by capacitor, e.g. (google.com)
Experiments1
- If you dig tube amps, you'll definitely be interested in his vaccum tube building experiments . (hackaday.com)
Television2
- In CRT television sets and computer monitors, the entire front area of the tube is scanned repeatedly and systematically in a fixed pattern called a raster. (wikipedia.org)
- Introduced in the late 1920s in mechanical form, television sets became a popular consumer product after World War II in electronic form, using cathode ray tube (CRT) technology. (wikipedia.org)
Voltage3
- An indirectly heated cathode requires current and voltage value 600 mA at 6.3 V . In the case of a highly efficient system the value is 300 mA at 6.3 V . (electronicscoach.com)
- Plate voltage for tubes ID to I4 is furnished by a battery IS. (google.com)
- A voltage divider I8, controlling the grid bias of triode I0, is adjusted so that this tube is normally conductive. (google.com)
Negative1
- The application of a negative triggering pulse to the grid of triode l0 renders the tube non-conductive thereby imposing a positive pulse through resistor I9 on the grid of triode H, rendering same conductive. (google.com)
Screen1
- Inside the TV set is also a flat screen which is on the other end of the cathode ray tube. (tech-faq.com)
Grid1
- The fabricated electron gun with the Mo-tip FEA cathode showed better performance in terms of emission current and switch-on time, even though the gate current was decreased due to the nonuniformity of the electric field by grid G2 and the strong repulsive force of G1 having grounded potential. (korea.ac.kr)
Electronic2
- Condition Human specializes in electronic and experimental releases from the lush hard electronica of Cathode Ray Tube to the sonic distruptions of Ampron Aubide. (cndhmn.com)
- The recycling operations included cathode ray tube (CRT) processing (demanufacturing and glass breaking operations, and electronic sorting, demanufacturing, shredding, and bailing operations for all other electronics. (cdc.gov)
Made2
- The face is typically made of thick lead glass or special barium-strontium glass to be shatter-resistant and to block most X-ray emissions. (wikipedia.org)
- Back toward the narrow end of CRT, there are steering coils made of copper windings, which are wrapped around the neck of the tube. (culturalheritage.org)
Temperature2
- The cathode is heated up to a high temperature from the boiler and the electrons 'evaporate' from the cathode surface. (steemit.com)
- To obtain high emission of electrons at a moderate temperature a layer of barium and strontium oxide is deposited at the end of the cathode. (electronicscoach.com)
High2
- The inside of such a tube has a very small pressure of 0.01Pa or less an so 'simulates' a high vacuum of space. (steemit.com)
- Three wipe samples taken from work surfaces in the Specialty Unit (PEHSU) investigated two cases of childhood cathode ray tubes area indicated high levels of lead. (cdc.gov)
Potential difference1
- Homework Statement An electron in a cathode ray tube is accelerated through a potential difference of ΔV = 11 kV, then passes through the d = 4 cm wide region of uniform magnetic field. (physicsforums.com)
Term1
- The first cathode-ray tube to use a hot cathode was developed by John Bertrand Johnson (who gave his name to the term Johnson noise) and Harry Weiner Weinhart of Western Electric, and became a commercial product in 1922. (wikipedia.org)
Computer monitors1
- The issue of what to do with old computer monitors is an important consideration, as the Environmental Protection Agency (EPA) prohibits cathode ray tubes (CRT) from being placed in landfills. (brighthub.com)
Light1
- Fluorescent tubes including energy-saving light bulbs. (scotborders.gov.uk)
Neck1
- Places bulb onto conveyor that carries bulb through processing stations to preheat bulb, insert and fuse gun to neck of bulb to form tube, and anneals and cools tube assembly. (occupationalinfo.org)
Current1
- The value is measured for X-ray, ultraviolet, visible, infrared, and radiofrequency radiation emissions were considerably below current threshold limit values or standards and did not represent an occupational hazard to the eyes. (cdc.gov)
Process1
- We found that employees in facilities that process cathode ray tube (CRT) glass, including employees in areas away from where the CRT glass is processed, can be overexposed to lead and cadmium. (cdc.gov)
Employees1
- Wipe samples were taken in children, in routine lead screening questionnaires, and in from the hands of 12 employees from the cathode ray tubes evaluating children with signs or symptoms of lead exposure. (cdc.gov)
Form1
- CRT is short form for Cathode Ray Tube. (fixya.com)
Device3
- In 1908, Alan Archibald Campbell-Swinton, fellow of the Royal Society (UK), published a letter in the scientific journal Nature, in which he described how "distant electric vision" could be achieved by using a cathode-ray tube (or "Braun" tube) as both a transmitting and receiving device. (wikipedia.org)
- The cathode - ray tube amusement device was invented by physicists Thomas T. Goldsmith Jr. and Estle Ray Mann. (lookformedical.com)
- This makes the cathode - ray tube amusement device a forerunner to other games in the early history of video games. (lookformedical.com)
Description1
- I loved the videos and description for the cathode ray tubes. (hackaday.com)
Front1
- This is due to the toxicity of the leaded glass which comprises all glass portions of the tube, with the exception of the front panel. (brighthub.com)