Week One Equipment

Question 1

What units does the cathode contain?

Answer 1

Filament and focusing cup

Question 2

The coil of wire that emits electons when heated

Answer 2

Filament

Question 3

This is a process where the high current boils off atoms and eject them from the filament

Answer 3

Thermionic Emission

Question 4

The upset of electrical characteristics within the tube. Can lead to abrupt tube failure

Answer 4

Arcing

Question 5

Cloud of charged filaments ejected during thermionic emission

Answer 5

space charge

Question 6

Metal shroud housing for the filament

Answer 6

focusing cup

Question 7

Two types of anodes

Answer 7

stationary and rotating

Question 8

What part of the anode is located outside the glass envelope

Answer 8

Stator

Question 9

What powers the rotation anodes?

Answer 9

electromagnetic induction motor

Question 10

Why use tungsten as anode target?

Answer 10

Can withstand high speed rotation and repetitive expansion and contraction

Question 11

Source of radiation in the xray tube

Answer 11

focal spot

Question 12

Focal spot becomes a —— with a rotating anode

Answer 12

focal track

Question 13

This is smaller than the actual focal spot because of anode angle

Answer 13

effective focal spot

Question 14

Three main components of xray imaging system

Answer 14

Operating console (primary circuit), high-voltage generator (secondary circuit), xray tube

Question 15

measures the voltage provided to the xray imaging system and adjusts the voltage to 220v

Answer 15

line compensator

Question 16

Has a single winding and is designed to supply a precise voltage to the filament circuit and to high voltage circuit

Answer 16

autotransformer

Question 17

regulates the length of exposure by the tech and timer

Answer 17

exposure switch

Question 18

the most accurate of the xray exposure timer

Answer 18

electronic timers

Question 19

radiation quality is xray — expressed in —.

Answer 19

quality, penetrability, kvp

Question 20

the process of converting AC to DC

Answer 20

rectification

Question 21

direction of current for AC

Answer 21

goes both ways

Question 22

direction of current for DC

Answer 22

One direction always from cathode to anode

Question 23

provides electrons for for the xray tube current by boiling them off the filament

Answer 23

Filament Circuit

Question 24

Radiation quantity is xray — expressed in — .

Answer 24

intensity, mAs

Question 25

Why should techs use high mA at a minmal seconds?

Answer 25

It will burn up the wire

Question 26

Function of Step-down transformer

Answer 26

Increases the amperage (mAs) going to the filaments. Increase current and decrease voltage

Question 27

device that measures the quantity of radiation that reaches the image receptor

Answer 27

Automatic Exposure Control