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they are fast ,they are less expensive ,they use lower amount of radiation
Laury Homenick
Kerah McCord
DAVID RICKS
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When did portable chest xrays in hospitals go digital in NJ?
That depends on the hospital. Digital x-rays were starting to become common back in the early 1990's but some places still use film today.
How was the digital camera made?
Some people thought that digital photography would offer some advantages over film-based photography, so they developed digital cameras.
What are digital x rays?
It is an xray that is taken by a computer. Normal x-rays are taken when X radiation passes through you body and reaches a x-ray cassette with film in it. The more dense areas of the body (bones) absorb the x radiation and keep them from hitting the film (called partial absorbtion) thus the bone are lighter white color. Areas such a lungs which have air in them are not as dense as bone and do not absorb x rays thus they are black on film. Other areas with densitys between bone and lung (air) will result in different levels of grays. The film is exposed by the xrays that are not absorbed and partly absorbed by the body. Also it is key to note the xray cassette that hold the film has a screen inside it that is emits a light when hit with xrays. It actually the screen lighting up that exposes the film, which in turn is developed into the traditional xray film. In digital xray there is no film. The xrays expose a photo cell that is connected to a computer. Thus connected to a display. The nice thing about a digital xray is you can adjust the black and gray levels and send the image over the internet to radiologists all over the world. Hope this helps. Do take note that digital x-ray always to be confused with the x-ray radiation as being 'digital'. The fact is only image acquisition is digital and there is so such thing as digital x radiation.
How do x rays see through things?
Xrays pass through most substinces. Various detectors can be used to detect the ammount of xrays that are sent from one side verses what is picked up on the other side. The difference can give you information about an object. Xray radiation is created when high speed electrons hit a solid object. Basically high voltage electricity (usually 40,000 - 120,00 volts) is pushed across a gap from a cathode to an anode. The Anode is usually made of tungsten or other materials that can withstand high temperatures. The anode is usually spinning so that the target is not hit in the same spot over and over again, this allows the anode to last longer. When the high voltage hits the target it releases xray radiation. Xray radiation is invisible, but it causes some elements to glow. The best used today are rare earth elements like yttrium and gadolinium. The xrays travel through the patient's body and hit a film cassette that is treated with some of these rare earth elements and it glows wherever the xrays reach it. Some of your body blocks the xrays so the screen only glows in areas that is not entirely blocked. The thicker and more dense the body part the more xrays are blocked. Bone is very dense so it blocks more xrays than most any other tissue, so bones show up as clear areas on the film. The film is placed between these screens inside the cassette safe from regular light. So that the only light that reaches this film is the light created by the glowing elements bombarded by xray radiation. The glowing of the elements bombarded by xrays causes the film to turn black and or grey depending on the amount of xrays that are blocked. Modern xray machines have cassettes that use different phosphorus materials that keep a temporary image on the cassette then the cassette is read by a machine and creates a digital image. There is no film in these type of cassettes. This is done because more and more facilities are not using film anymore. Storing xrays is cheaper and more efficient on computer hard drives as digital xrays. Because of the digital storage of xrays some xray machines do not use cassettes at all, only digital readers.
Why is it that sometimes when bones are x rayed they appear as white images?
Bones always appear as white images in regular xrays. However they arent really white because the film is clear, the plastic on the view box is white. But on xray film it is coated with a metalic layer. The xrays make the metalic layer stick to the film. So the black part of the film is where all the xrays reach the film. If the area on the xray is gray, then that means that some of the xrays are getting through implying that the structure is more dense than the black part. Soft tissue appears gray. The bone is a very dense structure allowing minimal to no xrays getting through. The film is then put through the processor and the film runs through chemicals that make the picture "stay" on the film. It is then rinsed and dried. Since the xrays make the metalic layer stick, none stick to the area of the bone because no radiation got through and the layer was washed off during processing. This is why bones appear white, they are the densest structure.
What is the difference between a digital film and just the regular film?
A digital film is stored and played from a hard drive. Technically its not film at all.
What happened to Fuji Photo Film when they first encountered digital photography?
Three things: they introduced a line of digital cameras, started selling minilabs that will print digital photos, and reduced their line of films.
Why do you want or need a digital camera?
Digital cameras offer more flexability than a film camera. Instant views of the picture you just took instead of having to wait to get them developed or the tedious process of developing them yourself. They also have a better image quality. They tend to be smaller depending on the model. You can set many different options on the way your pictures will be taken. All in all, they are more convient then a film camera.AnswerI'm going to disagree on the image quality issue--film can produce a much higher quality image than digital, especially when you start enlarging the images.Digital has two advantages over film: you can see your results more quickly than you can with film since you don't have to develop digital, and it costs less to use. Film has a few advantages over digital: it gives better results if you enlarge your images, it's quicker to sort a lot of film shots than it is to sort digital, you don't need a computer to get the most out of film images, and you'll never have to worry about your film "deciding" to delete itself.
What are the advantages of an instant film camera?
The only advantage of having a instant film camera is being able to have a physical picture immediately. The grain on those pictures are horrible to the pictures you will get from even the cheapest digital camera.
Advantages of digital camera?
1. They are quick and easy to use with one click of a button. 2. Optical zoom in todays technology can go up to 20 megapixels + 3. Digital camera's can be useful in travelling around the world for work.
Can a film camera can convert to digital camera?
No. You cannot economically convert a film camera to a digital camera. The digital system is very different and fitting it to an existing film camera is more expensive than buying a new digital camera. Some of the more expensive professional cameras can change between film and digital backs replacing the film transport with digital technology. The replacement backing includes all the electronics and controls typical of a digital camera of that caliber.
What do professionals prefer digital or film cameras?
Digital - time is money.
