What are radiographic images?
Radiography is an imaging technique using X-rays, gamma rays, or similar ionizing radiation and non-ionizing radiation to view the internal form of an object. A certain amount of the X-rays or other radiation is absorbed by the object, dependent on the object’s density and structural composition.
What is fluoroscopy imaging?
Fluoroscopy is a type of medical imaging that shows a continuous X-ray image on a monitor, much like an X-ray movie. During a fluoroscopy procedure, an X-ray beam is passed through the body.
What are the different types of radiography?
Content current as of:
- Computed Tomography (CT)
- Dental Cone-beam Computed Tomography.
How radiographic images are formed?
A radiographic image is created by passing an x-ray beam through the patient and interacting with an image receptor, such as an imaging plate in computed radiography (CR). The variations in absorption and transmission of the exiting x-ray beam structurally represent the anatomic area of interest.
What does radiographically mean?
(rā′dē-ō-grăf′) An image produced by radiation, usually by x-rays, and recorded on a radiosensitive surface, such as photographic film, or by photographing a fluoroscopic image.
What is a diagnostic image?
Diagnostic imaging lets doctors look inside your body for clues about a medical condition. A variety of machines and techniques can create pictures of the structures and activities inside your body. The type of imaging your doctor uses depends on your symptoms and the part of your body being examined. They include.
What are the 5 basic radiographic densities?
The five basic radiographic densities: air, fat, water (soft tissue), bone, and metal. Air is the most radiolucent (blackest) and metal is the most radiopaque (whitest).
What are the three basic rules of radiography?
Three basic principles should be adhered to when dealing with radiation and making radiographs: • Time • Distance • Shielding. These principles form the basis of a broader radiation safety concept called aLaRa (as Low as Reasonably achievable).
How density is formed in a radiograph?
When the mA or exposure time increases, the number of x-ray photons generated at the anode increases linearly without increasing beam energy. This will result in a higher number of photons reaching the receptor and this leads to an overall increase in the density of the radiographic image (Figure 2).
What causes foreshortening?
Foreshortening is the result of overangulation of the x-ray beam. When foreshortening occurs when using the paralleling technique, the angulation of the x-ray beam is greater than the long axis plane of the teeth. This error can also occur if the receptor is not placed parallel to the long axis of the teeth.
What are the different types of indications in radiography?
Indications in radiography may be false (such as image artifacts), nonrelevant (such as geometric or dimensional changes by design), and true or relevant (such as those resulting from discontinuities).
How are radiographic images used in casting courses?
Many courses use such standard radiographic images as the ASTM casting reference standards, IIW weld defect reference collection, and those provided through the instructors’ private collection. Ideally, the radiographs used in the courses should include real world images as well as those to be encountered by the interpreter.
What is the process of radiographic image interpretation?
The process of radiographic interpretation consists of many variables with the major objective being achieving the highest possible quality level. A qualified radiographer will maximize each variable in order to achieve the highest quality image even though the ideal technique may require additional time. Photo credit: Doug Miskell, ApplusRTD.
How to choose the best radiographic imaging plate?
For radiographs taken with an X-ray source, it means selecting the optimum kV based on the part thickness. Using the film or imaging plate with the highest possible resolution. Film with finer grain which produces higher resolution will require longer exposure times, but the major benefit is greater probability of detection.