Flashcards in Radiology Deck (188)
For soft tissue what contrast is desirable? For bone tissue?
low contrast(many shades of gray), high contrast
The state of chemicals and screen-film combinations can affect the quality of what?
of radiographs and mimic inappropriate exposures
The darkroom must be clean, organized, and what else?
completely light proof
All chemicals must be kept at the same temperature to prevent what?
T/F Bacterial, fungal, and algal growth are a common problem in hand-processing tanks and can be controlled by cleaning tanks with 1% chlorine bleach when they are drained.
T/F The legal requirement for keep radiographs is 7 years; however, it is advisable to keep them until the patient dies.
T/F Approximately 95% of the exposure recorded on a film is due to the light emitted from the intensifying screens. Only 5% of the exposure of the film results from the ionization of x-rays.
T/F A cassette must contain close contact between the intensifying screens and the film.
The primary function of the ____ is to reduce the amount of radiation exposure required to produce a diagnostic radiograph
____ screen speeds require a small exposure and produce less detail; ___ screens require a larger exposure and produce greater detail.
T/F Screens don't have to be cleaned regularly because dirt and hair do not get on the screen.
What can cause artifacts on the screen and lead to a wrong diagnoses?
dirt and hair
X-ray film is manufactured with ____ and ____
various speeds and latitude
The purpose of a ____ is to reduce the amount of scatter radiation and increase the quality of the radiographic image.
What is the most effective way to reduce backscatter?
to limit the size of the x-ray beam to include only the image receptor
Exposure to the radiographic film to x-rays makes the film ____
T/F The higher the tissue density, the higher the radiographic density.
false-lower radiographic density
What is the most common cause of poor radiographic contrast?
inappropriate exposure factors (kVp, mAs, exposure time)
There are 5 radiographic densities with the exception of ____.
How does air appear on a radiograph? Where is it?
black, commonly seen in lungs and as gas in the intestines
How does fat appear on a radiograph? Where?
white, usually found in the abdomen and under the skin
How does soft tissue appear on an radiograph? Where?
white, consists of internal organs like the liver, kidney, and intestines
How does bone appear on a radiograph?
How does metal appear on a radiograph?
vivid white, an example is lead
One of the densities called ____ can be difficult to visualize if not surrounded by fat.
What tissues are most sensitive to radiation induced damage?
all living cells, rapidly dividing cells (bone marrow), reproductive organs (no pregnant women)
How old do you have to be to be involved in radiographic procedures?
18 or over
Other tissues that are readily sensitive to radiation are?
bone, lymphatic, dermis, leukopoietic, hemopoietic, and epithelial tissues
What are 3 primary method by which personnel are exposed to radiation during radiography?
primary beam, secondary (scatter) radiation caused by interaction of the primary beam with objects in its path, and leakage radiation from x-ray tube housing