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Digital radiography
- 1. H A RI K B U D K E T H I R D Y E A R B S C M I T 0 3 Digital radiography
- 2. Introduction Digital radiographyis a form of X-ray imaging, where digital X-ray sensors are used instead of traditional photographic film.
- 3. Advantages Immediate imagepreview and availability Elimination of costly film processing steps A wider dynamic range, which makes it more forgiving for over- and under-exposure As well as the ability to apply special image processing techniques that enhance overall display quality of the image.
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- 5. Computed radiography Definition :digital radiography that records radiographic images on photostimulable phosphor plates instead of film/screen image receptors. The acquired image data are converted to electronic signals and digitized so they can be stored and manipulated by a computer and displayed on a high resolution monitor or recorded on film by using a laser printer.
- 6. Advantages : 1)CR plate can be reused. 2)No dark room processing required. 3)Image can be manipulated electronically. 4)Great dynamic range and reduced exposures
- 7. CR Cassette CR cassetteis the container that hold the imaging plate Different layers in CR imaging plate are 1) Supercoat – it protects the imaging plate from eternal trauma 2) Phosphor layer – traps electrons during imaging 3) Conductive layer – it grounds the IP to reduce the static electricity problems 4) Support layer – it provides strength to the base for coating other layers. 5) Backing – it is made up of soft polymer and protects the back of the cassette.
- 8. Readout process Interaction ofx- rays Electron excitation and trapping Laser light scanning Electrons to ground state with emission of light Light is detected by the PMT Conversion into electrons Output electronic signal Signal amplification ADC Digital processing Image formation
- 10. Care and maintenanceof cassette and plate Store imaging plates in their cassettes to protect them from dirt and damage. Do not store imaging plates and cassettes near a radiator or water source. Damage or dirt can result in streaks or artifacts appearing in the diagnostic image. Inspect cassettes for damage and proper opening and closing.
- 11. Cleaning the imagingplates 1. Safely remove the imaging plate from the cassette. 2. Wiping the plate gently with a dry, lint-free soft cloth or wipe. 3. If soil remains after Step 2, moisten a lint-free soft cloth and gently wipe the soiled area of the plate. Gently wipe the moistened area with a dry lint-free soft cloth to remove residual moisture. 4. If Step 3 is not effective, repeat using isopropyl alcohol.
- 12. Direct Radiography Theconversion of x-ray energy received from and imaged body part into a digital format using semiconductors, without first collecting images on an image plate or as light. Advantages : provides 2x-3x more dose efficiency. Image is rendered faster DR offers superior throughput and improves workflow.
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- 16. Care and maintenance Do not do hit the DR plate with repetitive high energy raw radiation. Careless handling can shorten the useful lifetime of an digital imaging detector When there is a risk of fluids contacting the detector, place the detector in a protective bag . If you are using a protective enclosure around the detector, remove the enclosure immediately after use to prevent the detector from overheating. When storing DR plate, store somewhere secure where the DR plate can be laid flat and cannot fall.
- 17. Cleaning Do notoperate the equipment when cleaning the equipment. Do not spray cleaning solution directly onto the equipment. Moisten a cloth with a 70 % isopropyl alcohol solution and apply to patient contact areas after each contact. Do not immerse the equipment in liquid. Consider purchasing approved clinical cleaning lint wipes.
- 18. System maintenance Donot attempt mechanical or electrical repair of the System. The System must be repaired only by authorized service personnel Contact authorized service personnel . if any unit does not perform to your satisfaction. The System must be maintained in good operating order at all times to provide safe conditions for technician and patients. The System must also be maintained to prevent possible loss of patient or image data.
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- 21. Disadvantages Whilst underexposurewill give us a grainy appearance, overexposure is automatically corrected by imaging software so there is a tendency to overexposure to ensure a good quality image. One of the main disadvantages of digital radiography is the high start-up cost but generally this is accepted due to the long term benefits of having the system and recouping costs over time With computed radiography systems, images need to be processed almost immediately as any delay will results in loss of image information due to trapped electrons returning to a lower energy state. This tends to be a problem in field radiography where images are required away from the practice
- 22. Reference https://quizlet.com/88158595/advantages-and- disadvantages-of-digital-radiography-flash-cards/ https://en.wikipedia.org/wiki/Digital_radiography https://radiopaedia.org/articles/digital-radiography www.vareximaging.com http://www.nova-medical.com/tec-04.html
Editor's Notes
- #6 PSP’s are the white plates within the cassette. They look similar to the intensifying screens used previously. CR system is the one that we use in our department and you’ll use it everyday, so today you’ll come to know how it all works.
- #11 Water or moisture can be absorbed into the plate’s phosphor layer, damaging the plate and degrading image quality.