Radiology module 10 Flashcards Preview

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Flashcards in Radiology module 10 Deck (25):
0

Gray scale resolution is ---- with digital film?
It has ----- shades of gray compared to normal films ---- shades of gray?

Higher
256
16-25

1

Patient exposure to x-rays is --- to
--- % lower with digital x-rays

50-90%

2

Resolution on digital film is
----lp/mm compared to ---- lp/mm on conventional film

10
12-20

3

The two types of digital imaging are?

Direct
Indirect

4

Direct digital is wired to a computer with either a --- or----

CCD charged coupling device
CMOS complementary metal-oxide semiconductor

5

The Two types of indirect digital systems are?

Scanning radiographs
Storage phosphor plate

6

The indirect digital phosphor system uses a --- and ---- to get images onto a computer

PPP or PSP
(photo-stimulable phosphor plate)
Laser beam scanner

7

Indirect digital (scanning) is ---- to direct digital because?

Inferior
It is a "copy" of an original image

8

Indirect phosphor offers -- size of film

Different

9

What are the 5 basic elements needed to take a digital x-ray?

X-ray machine
Sensor or detector
Analogue to digital converter
Computer
Monitor

10

Digital sensors are --- sensitive to x-rays than conventional film?
(Do you need more/less radiation?)

More
Less

11

An ---- image is captured by the digital sensor and then converted into ---- that can be stored on the computer

Analog
Electronic pieces of data (digital)

12

Traditional film has --- --- in the emulsion that produce the image.
Digital sensors have ----

Halide crystals
Pixels

13

The silver halide crystals are arranged in what manner on the emulsion?

Randomly

14

In digital sensors the pixels are arranged how?

Each has a specific spot

15

Each pixel has a --- --- representing the --- penetration of the object!

Gray level
Photon

16

Your eyes can only see --- out of the 256 shades of gray on digital images

32

17

Digital imaging requires --- impulses vs --- impulses for a normal film

3
12

18

Most people feel like digital images do not equal film in regards to --- and ---

Sharpness
Detail

19

Exposure time for digital is approx. --- of conventional film
Ie --- impulses

1/2
3 (3/60 or .05 second)

20

A pixel is a --- ---

Picture element
A specific spot on the sensor

21

When an x-ray photon hits the pixel it is ---- ---.

Electronically charged

22

When the pixel is electronically charged it is done in proportion to what?

The number of electrons that react with that particular pixel
(electron potential well)

23

Major digital image software manufacturers have a built in --- --- to signal when an image has been altered

Audit indicator

24

Digital imaging will soon replace traditional films due to its ---, ----,
-----, and -----

Speed
Enhancement capabilities
Electronic format
Benefits to patient and communication