Films, Sensors and Development Flashcards Preview

Radiology > Films, Sensors and Development > Flashcards

Flashcards in Films, Sensors and Development Deck (18):
1

What are the two principle components of Film?

1-Emulsion (photo sensitive silver halide)
2-Base (plastic)

2

What are three things sheet films or intensifying screens might be used for?

1-Panographic
2-TMJ
3-Cephalometric

3

The dot on developed film serves as a guid and is raised toward what?

Source of radiation

4

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

5

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

6

What can be used to reduce scatter and fog on a radiograph?

A Grid

7

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

8

Raising the temperature 10 degrees celsius has what affect on developing time?

doubles reaction rate, cutting development time in half

*quality may be compromised

9

When was the first intramural x-ray sensor introduced?

1987

10

Lower patient exposure, faster radiographs and being more ecofriendly are advantages to what type of radiograph?

Digital

11

A sensor that connects directly to a computer and provides immediate images is called what?

Direct digital system

12

A reusable phosphor plate that is scanned in to the computer after exposure is called what?

Indirect digital system

13

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)

14

What form are medicinal communications stored as?

DICOM format

15

The ability to distinguish different densities in an image is referred to as?

Contrast

16

The ability to distinguish fine detail is called what?

Spatial resolution

17

The ability to capture a range of exposures is called what?

Sensor latitude

*PSP has greater latitude than other sensors

18

How does a digital sensor work?

X-ray photons are converted to visible light as they hit the Csl Scintillator. The light is then channeled via fiberoptic to the CCD