Films, Sensors and Development Flashcards
What are the two principle components of Film?
1-Emulsion (photo sensitive silver halide)
2-Base (plastic)
What are three things sheet films or intensifying screens might be used for?
1-Panographic
2-TMJ
3-Cephalometric
The dot on developed film serves as a guid and is raised toward what?
Source of radiation
What are the 5 sizes of film?
1-Size 0-Pedo 2-Size 1-Adult anterior 3-Size 2-Adult posterior 4-Size 3-Long posterior 5-Size 4-occlusal
The larger the crystals of silver halide the ______ the film speed
Faster
*C is slowest, F is fastest. Smaller crystals need longer exposure but have a crisper image
What can be used to reduce scatter and fog on a radiograph?
A Grid
What are the 5 steps for developing film?
1-Developer (convert silver halide to metallic silver grains)
2-Wash (30 sec, remove developer)
3-Fixer (remove undeveloped silver halide, harden and shrink emulsion)
4-Wash (remove fixer)
5-Dry
Raising the temperature 10 degrees celsius has what affect on developing time?
doubles reaction rate, cutting development time in half
*quality may be compromised
When was the first intramural x-ray sensor introduced?
1987
Lower patient exposure, faster radiographs and being more ecofriendly are advantages to what type of radiograph?
Digital
A sensor that connects directly to a computer and provides immediate images is called what?
Direct digital system
A reusable phosphor plate that is scanned in to the computer after exposure is called what?
Indirect digital system
What are three types of digital sensors?
1-Photostiumable storage phosphor plate (PSP)
2-Charge-coupled devices (CCD. early sensor)
3-Complentary Metal oxide semiconductor (CMOS)
What form are medicinal communications stored as?
DICOM format
The ability to distinguish different densities in an image is referred to as?
Contrast
