Showing posts with label ct scanner parts. Show all posts
Showing posts with label ct scanner parts. Show all posts
CT Scanner Parts
Advances in CT Scanner X-Ray Tubes
Wilhelm Roentgen, is best known is best known for the discovery of "Roentgen Rays", now univerally known as x-rays. Around this time, in 1985, various scientists were investigating the movement of electrons through a glass apparatus known as a Crookes tube. Roentgen wanted to visually capture the action of the electrons, so he wrapped his Crookes tube in black photographic paper. When he ran his experiment, he noticed that a plate coated with a fluorescent material, which just happened to be lying nearby the tube, glowed. This was unexpected, because no visible light was being emitted from the wrapped tube. Upon further investigation, he found that indeed there was some kind of invisible light produced by this tube, and it could penetrate materials such as wood, aluminum, and even human skin.
As the field of radiography expanded, x-ray technology steadily improved. One of the major limitations of conventional x-rays was that they lacked depth; therefore many internal structures were superimposed on each other, making it difficult to read results. With the help of computers, scientists developed methods to solve this problem. One such method was computed tomography (CT), or computerized axial tomography (CAT). The first CT scanner was demonstrated in 1970 by Godfrey Hounsfield and Allen Cormack. Over the next 20 years, significant advances were made in CT scanner design, which have resulted in the high-quality imaging scanners used today, and still constantly improving.
A CT scanner x-ray tube is a special type of vacuum-sealed, electrical diode that was designed and developed to produce x-rays. The CT scanner x-ray tube is comprised of two electrodes: the cathode and anode. To generate x-rays, a filament in the cathode is charged with electricity from a high -voltage generator. This causes the filament to heat up and emit electrons. Using their natural attraction and a special focusing cup, the electrons travel directly toward the positively charged anode. X-rays are indiscriminately released when the electrons strike the anode. The anode, which can be rotating or not, then conducts the electricity back to the high-voltage generator to complete the circuit. To focus the x-rays into a beam, the CT scanner x-ray tube is contained inside a protective housing. This housing is lined with lead, except for a small window at the bottom. Functional x-rays are able to escape out this window, while the lead prevents the escape of stray radiation in other directions.
CT scanner x-ray tubes have gone through several generations of technological evolution. In the third generation, developers realized that if a pure rotational scanning motion could be used, rather than the slam-bang translational motion, then it would be possible to use higher power, rotating CT scanner x-ray tubes and therefore improve scan speeds in thicker, harder to penetrate body parts. A standard machine which most x-ray technicians are familiar with, uses a large fan beam, so that the patient is completely covered by the fan and the detector elements are aligned along the arc of a circle centered on the focus of the CT scanner x-ray tube. The CT scanner x-ray tube and detector array rotate as one through 360 degrees, different projections are attained during rotation by pulsing the x-ray source, and bow-tie shaped filters are chosen to suit the body or head shape by some manufacturers to avoid extreme variations in signal strength.
The fourth generation of CT scanners uses rotate-fixed ring geometry, where a ring of fixed detectors completely surrounds the patient. The x-ray tube rotates inside the detector ring through a full 360 degrees with a wide fan beam producing a single image.
A limiting factor in image acquisition used to be the CT scanner x-ray tube. The need for long, high intensity exposures and very stable output placed enormous demands on both the CT scanner x-ray tube and generator (power supply). Very high performance rotating anode CT scanner x-ray tubes were developed to keep up with demand for faster imaging, as were the regulated 150 kV switched mode power supplies to drive them. Current CT scanning systems have power ratings up to 100 kW.
The most popular, international marketplace for all types of medical equipment, featuring a large selection of CT scanner x-ray tubes, MedWOW, is an excellent place to find reliable and good-quality imaging equipment and parts. When purchasing or selling CT scanner x-ray tubes, MedWOW’s comprehensive portal attracts nearly 12,000 medical equipment professionals daily, making it easy to find what you seek. MedWOW has recently upgraded its imaging and CT scanner x-ray tubes section with additional manufacturers, including refurbished equipment and new and used CT scanner x-ray tubes. CT scanner x-ray tubes manufacturers represented on MedWOW include: Elscint, Esaote, GE Healthcare, Philips, Picker, Shimadzu, Siemens, Toshiba and more.
The Technology of CT Scanner Detectors: from 1 to 256 Slices and Beyond
The CT scanner is made up of a complex combination of an x-ray source, detectors and computers, which produce high-resolution, cross-sectional images of the body. The patient lies on a table that passes through a gantry which resembles a donut hole, containing the x-ray tube and multiple detectors. The walls of the opening into the gantry are wedge-shaped, designed so that claustrophobia is not a considerable problem in most cases. A series of cross-sectional images are taken of the area to be examined in a matter of seconds. The raw data from the multiple detectors are then reconstructed by specially programmed computers, to present images of the internal structures of the area scanned.
Everything you Need to Locate Replacement CT Parts
As you probably know, CT stands for computerized tomography, and the CT scanning system is an integrated network of CT parts that form a complex and important tool for imaging departments and clinics. Pictures of structures within the patient’s body are produced by a computer CT part that takes the data from multiple x-ray images and turns them into images on a screen. The CT scan has the capability to reveal a variety of soft-tissue and other structures that cannot be seen using conventional x-ray. Using the same amount of radiation as that of an standard x-ray machine, an entire slice of the body can be made visible with about 100x more clarity ─ thanks to the power of the system’s CT parts.
The tomograms, also known as cuts for CT systems are usually made 5mm to 10mm apart. The CT machine rotates 180 degrees around the patient's body, sending out thin X-ray beams at 160 different points. Crystal CT parts positioned at the opposite points of the beam pick up and record the absorption rates of the varying thicknesses of tissue and bone. The data is then passed on to a computer CT part that turns the information into a 2-dimensional, cross-sectional image.
Malfunctioning of any of the CT parts can cause downtime in your imaging center, causing a backlog of patients, which is avoidable if you have a trustworthy source easily available for locating replacement CT parts. For example, CT tube lifecycles are relatively short and are among the most highly used CT parts. This makes tubes some of the most important replacement CT parts for any CT scanner system, and knowing how to replace them on short notice is critical to the successful operation of your imaging facility.
Buying used CT parts can be uncomplicated and trouble-free if you know in advance the right way to go about finding replacement CT parts of all types, as you never know when you are going to need them. If you don’t know where and how to look, finding specific used CT parts can be a bit more challenging.
MedWOW has come up with an easy-to-use and wide-ranging search engine that can find CT parts easily, even allowing you to compare and contrast competitive offers on CT parts from dealers and manufacturers from all over the world, so you can take advantage and get the very best deal possible, including negotiating on packing, shipping, inspection and other associated CT parts services.
An alternative MedWOW option to finding replacement CT parts is the portal’s unique CT Part Finder Service. In order to best serve its international population of medical equipment professionals, physicians and technicians, MedWOW formed partnerships with several of the major used CT parts suppliers throughout the world. Therefore, they can supply healthcare professionals with any available CT part from any manufacturer, make and model if it is available in almost any inventory. This means that if you are searching for a specific used CT part and are unable to find it, the MedWOW CT Parts Finder will help you with your search, and probably find it for you, at no extra cost. This includes the full range of primary CT parts, including gantry, x-ray tube, banana detector arch, computer system and CT scanner table, as well as the secondary CT parts that need to be taken into consideration.
Another efficient way to hunt for CT parts is to post a buying request on MedWOW, by filling out an online form and giving as much information as possible about the CT part you need. MedWOW attracts thousands of sellers from all over the world and so you will quickly be sent competitive CT part quotes in a short amount of time.
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