x-ray production

Question 1

roentgen discovered x-rays while working with an Crookes tube

Answer 1

Crookes

Question 2

An electron cloud surrounding the filament of the cathode is referred to as space charge

Answer 2

space charge

Question 3

the creation of the space charge in the x-ray tube produces

Answer 3

thermonic emission

Question 4

The majority of photons in the x-ray beam are created by which process?

Answer 4

Brems

Question 5

more than 99 of the energy of the electron stream is converted into : HEAT

Answer 5

Heat

Question 6

The high-speed rotation (100,000 rpm) of the anode enables

Answer 6

greater dissipation of heat from high technical factors.

Question 6

The degree of angulation of the x-ray tube target will determine the

Answer 6

size of the actual focal spot and effective focal spot

Question 7

A dual focus x-ray tube

Answer 7

1. two filaments
   2.two focal spot sizes

Question 8

the anode heel effect is a phenomenon of x-ray production that results in :

Answer 8

uneven distribution of radiation within the x-ray field.

Question 9

The penetrating power of the x-ray beam is controlled by varying the KVP

Answer 9

peak kilovoltage

Question 10

The rate of current flow across the x-ray tube is measured in

Answer 10

mA

Question 11

doubling the mA will result in:

Answer 11

1. increased patient dose 2. twice as many photons in the x-ray beam 3. increased radiographic density

Question 12

the unit used to indicate the total quantity of x-ray exposure is :

Answer 12

(MAS)

Question 13

the device for removing long wavelength radiation from the primary x-ray beam is the

Answer 13

filter

Question 14

x-ray equipment capable of producing 70 kvp or more is required to have total filtration of at least

Answer 14

2.5 MM AI equiv.

Question 15

The purpose of rotating the anode of the x-ray tube is to :

Answer 15

increase the heat capacity of the anode

Question 16

image sharpness is determined by the

Answer 16

size of the effective focal spot

Question 17

above 70 kvp what percentage of photons is created by the Bremsstrahlung process

Answer 17

85 percent

Question 18

the amount of detail seen in the x-ray image is referred to as

Answer 18

spatial resolution

Question 19

what is the percentage of characteristic radiation that is produced below 70 kvp ?

Answer 19

none . characteristic radiation can only be produced above 70 kvp.

Question 20

the primary purpose of filtration is to

Answer 20

reduce patient dose

Question 21

the filament is made of

Answer 21

tungsten

Question 22

target and the anode are made of

Answer 22

tungsten

Question 23

what is added to the port to remove the long wavelength radiation

Answer 23

aluminium

Question 24

what type of motor is used to turn the anode inside the x-ray tube

Answer 24

induction motor

Question 25

larger focal spot used -

Answer 25

larger patients or thick and dense body parts

Question 26

all of the following devices are located within the low voltage circuit and control console except the : kilovolt control, exposure switch , autotransformer

Answer 26

step up transformer