CR And DR

Question 1

Bit

Answer 1

Single unit of data (0 white or 1 black)

Question 2

Total number of bits in a byte system

Answer 2

8

Question 3

Bit depth

Answer 3

• Number of gray shades

- 2^n total possible number of coloration

Question 4

What are the total number of bit values

Answer 4

2

Question 5

What is the main controlling factor of greyscale/contrast

Answer 5

LUT

Question 6

What is the imaging plate used in a CR system known as

Answer 6

PSP

Question 7

What are the phosphors made of used in PSP plate

Answer 7

Barium fluorohalide

Question 8

Latent image

Answer 8

Invisible image, electronic image made of valence electrons stored in high energy traps

Question 9

Manifest image

Answer 9

Visible image, made by exposure to a very small beam from a high energy laser

Question 10

Imaging plate reader

Answer 10

-employs laser that reads the energy stored in the conductive layer, causing light to be emitted that is amplified by the photomultiplier

Question 11

Fast scan

Answer 11

Raster pattern movement of the laser across the PSP plate

Question 12

Slow scan

Answer 12

Mechanical movement of the PSP plate into the CR reader

Question 13

S (sensitivity numbers)

Answer 13

Have an inverse or indirect relationship to the amount of exposure

Question 14

EI (exposure index)

Answer 14

A direct relationship to the amount of exposure

Question 15

lgM (logarithm of the median exposure)

Answer 15

A direct relationship to the amount of exposure

Question 16

Indirect uses what material

Answer 16

Cesium iodide (CsI) or gadolinium oxysulfide

Question 17

What is the device used to convert x-rays to light in an indirect capture system

Answer 17

Scintillator

Question 18

What is the photoconductive material in indirect system made of

Answer 18

• amorphous silicon

- used to convert light photons into electrons, light is imaged onto a CCD

Question 19

CCD requires what to produce light

Answer 19

Scintillator material, indirect form of image capture

Question 20

Light from the scintillator strikes _____ to convert it into an electrical signal

Answer 20

CCD

Question 21

TFT arrays absorb xray photons and convert them into what

Answer 21

Electrical signals using amorphous silicon (TFT panel)

Question 22

Direst 2 step process uses what as the image receptor

Answer 22

Active matrix array (a-Se w/ TFT)

Question 23

Direct system uses what material

Answer 23

Amorphous selenium, converts xray beam into electrons that are collected by the TFT