What is an anatomically programmed radiography?
Anatomically programmed radiography (APR) is a system of preprogrammed exposure technique set- tings that is organized by position and examination and set through the control panel of the radiography unit. Essentially, an APR system is an electronic technique chart.
What is radiographic penumbra?
the part of a shadow in which there is a small amount of illumination from a light source. 2. blurring at the edges of a structure on a radiograph.
What is the Norgaard method?
The Norgaard method is sometimes referred to a the ball cathcer’s position, assist in detecting early rheumatoid arthritis. Norgaard reported that it is often possible to make an early diagnosis of rheumatoid arthritis by using this position before laboratory tests are positive.
What are the different types of views used in chest radiography?
Related articles: Imaging in practice
- chest (PA view)
- chest (lateral view)
- chest (AP erect view)
- chest (supine view)
- chest (AP lordotic view)
- chest (lateral decubitus view)
- chest (expiratory view)
- sternum (lateral view)
How can collimation affect AEC image quality?
How can collimation affect AEC image quality? Improper collimation around the ionization chambers can cause a longer than normal exposure; causing an overexposure because the system thinks the part is extremely dense.
Which of the following is the purpose of collimation?
Proper collimation is one of the aspects of optimising the radiographic imaging technique. It prevents unnecessary exposure of anatomy outside the area of interest, and it also improves image quality by producing less scatter radiation from these areas.
What is umbra and penumbra in radiography?
❖ Umbra: Is the area of total shadow and its exist only when the object absorb all. of X – rays. Penumbra is created by the size of focal spot (source of radiation), the larger the spot size the greater is the penumbra (the amount of un sharpness).
How does penumbra affect the radiographic image?
The apparent focal spot size: The larger is the size of the apparent focal spot, the larger is the penumbra, resulting in a less sharp image. Source-to-object distance: The greater is the source-to-object distance, the smaller is the penumbra, resulting in a sharper image.
What is the ball-catcher’s view?
The ball-catcher view is typically undertaken to assess for erosive arthropathies such as rheumatoid arthritis. It often complements the bilateral PA view of the hands and is generally thought to be the superior view to illustrate joint erosions.
What is a scaphoid view?
The posteroanterior ulnar deviation scaphoid view is part of a four view series of the scaphoid, wrist and surrounding carpal bones. Although performed PA, the view can often be referred to as an AP view. The view is performed with the wrist in ulnar deviation to free the scaphoid from bony superimposition.
What is Posteroanterior view?
In a posteroanterior (PA) view, the x-ray source is positioned so that the x-ray beam enters through the posterior (back) aspect of the chest and exits out of the anterior (front) aspect, where the beam is detected. To obtain this view, the patient stands facing a flat surface behind which is an x-ray detector.