Exam one 33?

Question 1

What is the last name of the person who discovered X-rays

Answer 1

Roentgen (Wilhelm Conrad Roentgen)

Question 2

Roentgen discovered X-rays by working with the conduction of high voltage electricity through what

Answer 2

Vacuum tubes (Crookes tube)

Question 3

What year were X-rays discovered?

Answer 3

1895

Question 4

What are two things that X-rays do NOT have

Answer 4

Possess no mass and have no electrical charge

Question 5

What happens to the penetrating power and frequency if you decrease wavelength

Answer 5

increase penetrating power and frequency

Question 6

Filament is the source of electrons and it is made of what

Answer 6

Tungsten

Question 7

What is the positively charged electrode in the tube

Answer 7

Anode

Question 8

What part are the magnets OUTSIDE the glass envelope

Answer 8

Stator

Question 9

What part is the shaft of copper and iron INSIDE the glass envelope, turns the target

Answer 9

Rotor

Question 10

When the filament gains enough heat there will be boiling off of electrons from the filament, causing space charge and this is known as what

Answer 10

Thermionic emission

Question 11

Above 70 kVp approximately 85% of the X-rays are of what origin

Answer 11

Bremsstrahlung

Question 12

On the ANONE side what happens when the exposure button is pushed

Answer 12

Electrons strike the anode

Question 13

The tube current is measured in what

Answer 13

Milliamperes (mA)

Question 14

When electrons strike the target, approximately what percent of there kinetic energy is converted to HEAT while what other percent is converted to xrays

Answer 14

99 percent is heat and 1 percent is xrays

Question 15

What determines the speed at which the electrons move in the tube current

Answer 15

kVp

Question 16

What affects the quality and quantity of xrays

Answer 16

kVp

Question 17

The smaller the _______ is the better the quality of the radiograph

Answer 17

Effective focal spot size

Question 18

What is the Anode Heel Effect state

Answer 18

Xrays produced from the anode side of the target must go through a greater thickness of target material = a decrease in the intensity of the X-ray beam on the anode side of the tube

Question 19

Federal Government guidelines require that tubes that operate above 70kVp must have a minimum of how munch aluminum equivalent total filtration

Answer 19

2.5mm of aluminum equivalent total filtration

Question 20

The timer is a component of what side

Answer 20

Low voltage side

Question 21

What senses changes in incoming voltages

Answer 21

Line compensator

Question 22

What controls the tube current(current going from cathode to anode)

Answer 22

Milliampere selector (filament control)

Question 23

What frequency type can decrease exposure time => decreasing patient dose

Answer 23

High frequency (chiros use this type)

Question 24

What type of film screen does DR utilize

Answer 24

Flat panel

Question 25

What is defined as the ReDUCTION in the energy of the PRIMARY beam as it passes through the body

Answer 25

Attenuation

Question 26

What is responsible for the total absorption of the incoming X-ray photon

Answer 26

Photoelectric effect (deals with absorption)

Question 27

Substances that contain many hydrogen atoms (water and soft tissue) have a higher what

Answer 27

probability Compton Scatter

Question 28

Substances that contain many hydrogen atoms have a higher probability compton scatter because why

Answer 28

Because hydrogen has almost twice the number of electrons as most other substances

Question 29

What type of person would be more likely to have compton scatter

Answer 29

Person with lots of water and ST (like an OBESE MALE)

Question 30

The air gapping technique is used in what views

Answer 30

Cervical obliques

Question 31

What are the 3 main components of the X-ray system

Answer 31

Tube, control panel, and high voltage generator

Question 32

What is the weaker side between cathode and anode

Answer 32

Anode

Question 33

Anything under 70kVp =s how much Bremsstrahlung origin

Answer 33

100%