x-ray circuit and tube heat management

Question 1

All of the following devices are located within the low voltage circuit and control console except the :

Answer 1

Step- up transformer

Question 2

The autotransformer s primary purpose is to vary the:

Answer 2

voltage

Question 3

which transformer is located in the filament circuit?

Answer 3

step-down transformer

Question 4

The primary purpose of the filament circuit is to :

Answer 4

heat the x-ray tube filament for thermonic emission.

Question 5

A timer that is capable of producing ultrashort exposure times is typical of an

Answer 5

electronic timer

Question 6

The primary purpose of a rectifier in an x-ray circuit is to

Answer 6

change alternating current (AC) into direct current (DC).

Question 7

the primary purpose of the high voltage circuit is to :

Answer 7

supply the x-ray tube with voltage high enough to produce x-rays.

Question 7

The advantages of using a high frequency generator instead of a single phase generator include : 1. producing x-rays more efficiently. 2. requiring less exposure time to produce a given amount of exposure 3. producing the greatest amount of x-rays for the same exposure technique. ( 1,2,3,)

Answer 7

1 and 2 and 3

Question 8

how much can the exposure time be decreased when using three phase x-ray equipment?

Answer 8

40 percent

Question 9

automatic exposure control AEC automatically varies the : exposure time

Answer 9

exposure time

Question 10

which of the following steps should be used to extend x-ray tube life

Answer 10

1. warm up the anode 3. do not make repeated exposures near the tube limits

Question 11

how many heat units are generated using high frequency generator at 200 mA 0.10 sec and 85 kvp ?

Answer 11

2380

Question 12

For which type of x-ray exposure system can the technical factors be programmed into the system?

Answer 12

Anatomically programmed radiography (APR)

Question 13

which transformer is located in the high -voltage circuit ?

Answer 13

step up transformer

Question 14

how much higher is the percentage of x-rays produced in a three phase x-ray machine

Answer 14

40 percent

Question 15

in a high frequency x-ray generator the standard 60 Hz frequency is increased to about :

Answer 15

6000 Hz

Question 15

the highest power x-ray generator is the

Answer 15

high frequency generator

Question 16

The advantage of full wave rectification is that the exposure time can be cut in half

Answer 16

true

Question 17

the shortest exposure times are obtained sing high frequency generators

Answer 17

true

Question 18

the heat units formula for a three phase x-ray generator is

Answer 18

HU=mA x TIME x KVP x 1.35

Question 19

low voltage circuit contains

Answer 19

AC power supply , autotransformer , exposure timer

Question 20

filament circuit contains

Answer 20

mA selector , step down transformer

Question 21

high voltage circuit contains

Answer 21

rectifier unit , step up transformer, and the x-ray tube

Question 22

what is the name of the device used to provide rectification in the x-ray circuit ?

Answer 22

A DIODE

Question 23

to ensure that x-ray tubes will last a long time the maximum heat capacity should remain below

Answer 23

80 percent

Question 24

how many pulses of radiation occur in a full wave rectified x-ray machine

Answer 24

120 individual pulses

Question 25

what type of rectification is used in most modern x-ray generators

Answer 25

full wave rectification

Question 26

most common type of x-ray exposure timer is the

Answer 26

electronic

Question 27

which exposure control system requires that the kvp ,mA and exposure time be individually selected?

Answer 27

Manual exposure control

Question 28

with automatic EXPOSURE control which technical factor is automatically selected?

Answer 28

the exposure time

Question 29

when using automatic exposure control for the exposure, what must be absolutely accurate to ensure that a correct exposure will occur?

Answer 29

patient positioning

Question 30

if over collimation occurs when using automatic exposure control , the resultant image will be

Answer 30

Light or underexposed because the exposure time was reduced.

Question 31

when using anatomically programmed radiography for the exposure techniques what technical factors are automatically set?

Answer 31

Exposure time , kvp , mA, AEC detectors , body habitus, bucky and SID.

Question 32

The maximum x-ray tube capacity for a single x-ray exposure can be determined by consulting the :

Answer 32

Tube rating chart

Question 33

what is the formula for determining a heat units (HU)

Answer 33

multiply the mA ,kvp and exposure time
( mA x KVP x time = HU)