Deck 1: Introduction to Radiography

Question 1

The current across the x-ray tube is measured in units of:

A) milliamperes.
B) kilovolts.
C) rads.
D) roentgens.

Answer 1

milliamperes.

Question 2

Which of the following is NOT an accurate statement regarding the characteristics of x-rays?

A) They can penetrate matter that is impenetrable to light.
B) They cause certain crystals to fluoresce.
C) They can be refracted by a lens.
D) They cannot be detected by the human senses.

Answer 2

They can be refracted by a lens.

Question 3

The primary purpose of intensifying screens is to:

A) protect the film from light and damage during radiography.
B) improve the definition on the radiograph.
C) reduce the quantity of radiation required to produce a satisfactory image.
D) reduce the possibility of artifacts on the film.

Answer 3

reduce the quantity of radiation required to produce a satisfactory image.

Question 4

When the source-image distance (SID)is doubled,the intensity of the radiation in the radiation field will be:

A) doubled.
B) halved.
C) reduced by a factor of 4.
D) quadrupled.

Question 5

An imaginary photon that is emitted from the center of the focal spot,perpendicular to the long axis of the x-ray tube,is called the:

A) electron stream.
B) x-ray beam.
C) central ray.
D) radiation field.

Question 6

A device used to control the size of the radiation field is a:

A) collimator.
B) tube housing.
C) detent.
D) filter.

Question 7

X-rays were discovered in 1895 by:

A) Coolidge.
B) Crookes.
C) Roentgen.
D) Edison.

Question 8

Of the following types of electromagnetic energy,which has the shortest wavelength?

A) Radio waves
B) X-rays
C) Visible light
D) Ultraviolet light

Question 9

A doubling of the mA with no change in exposure time will result in which of the following?
1)Increased anode heat
2)Increased radiographic density
3)Increased number of photons in the x-ray beam

A) 1 only
B) 2 only
C) 1 and 2
D) 1, 2, and 3

Question 10

Which of the following statements best describes the current knowledge regarding the effects of exposure to low doses (<20 rad)of ionizing radiation?

A) It causes cancer after a certain amount of radiation has been received.
B) Depression of the white blood cell count is followed by acute gastrointestinal distress.
C) Birth defects will occur if the patient is pregnant.
D) There is increased risk of cancer, leukemia, birth defects, and cataracts.

Question 11

What is a rem?

A) A radiation unit that is determined by measuring ionization of air
B) A device containing a crystal that absorbs radiation energy and discharges it in the form of light when heated
C) A factor that quantifies the relative health risks of various types of radiation
D) A radiation unit used to measure dose equivalents for occupational exposure

Question 12

An electron cloud surrounding a hot cathode is referred to as a(n):

A) focusing cup.
B) ampere.
C) space charge.
D) filament.

Question 13

An x-ray exposure is made using the following factors: 200 mA,0.04 second,80 kVp,and 40 inches SID.In this case,which represents the value of the mAs?

A) 0.08
B) 0.8
C) 8
D) 16,000

Question 14

The effective dose limit for whole-body radiation in 1 year for a nonpregnant radiation worker over the age of 18 is:

A) 5 millirem.
B) 0.5 rem.
C) 5 rem.
D) 50 rem.

Question 15

Which of the following devices is NOT employed to reduce the hazards of radiation exposure to the patient?

A) Gonad shield
B) Bucky
C) Intensifying screen
D) Collimator

Question 16

An increase in object/image-receptor distance (OID)will result in which of the following?
1)Increased magnification
2)Decreased image detail
3)Increased image detail

A) 1 only
B) 2 only
C) 1 and 2
D) 1 and 3

Question 17

Which of the following will result in the lowest patient dose?

A) Low kVp and high mAs
B) High kVp and low mAs
C) How kVp and long exposure time
D) Long exposure time and short SID

Question 18

What is a rad?

A) A radiation unit that is determined by measuring ionization of air
B) A factor that quantifies the relative health risks of various types of radiation
C) A radiation unit used to measure patient dose
D) A radiation unit used to measure dose equivalents for occupational exposure

Question 19

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

A) create a space charge.
B) remove long-wavelength photons from the x-ray beam.
C) focus the electron stream on a small target area.
D) increase the heat capacity of the anode.

Question 20

The function of an x-ray grid is to:

A) decrease patient radiation dose.
B) increase radiographic resolution.
C) increase radiographic contrast by reducing scatter radiation fog.
D) increase radiographic density.

Question 21

Grids or buckys are generally used for body parts that measure greater than:

A) 2 to 4 cm.
B) 10 to 12 cm.
C) 18 to 20 cm.
D) 30 cm.

Question 22

What is meant by WF?

A) A device containing a crystal that absorbs radiation energy and discharges it in the form of light when heated
B) A factor that quantifies the relative health risks of various types of radiation
C) A radiation unit used to measure patient dose
D) A radiation unit used to measure dose equivalents for occupational exposure

Question 23

The access point for the radiographer to determine the exposure factors and to initiate the exposure is called the:

A) transformer.
B) image receptor unit.
C) control console.
D) stationary grid.

Question 24

What is a Gy?

A) A radiation unit that is determined by measuring ionization of air
B) A factor that quantifies the relative health risks of various types of radiation
C) A radiation unit used to measure patient dose
D) A radiation unit used to measure dose equivalents for occupational exposure

Question 25

What is a TLD?

A) A radiation unit that is determined by measuring ionization of air
B) A device containing a crystal that absorbs radiation energy and discharges it in the form of light when heated
C) A factor that quantifies the relative health risks of various types of radiation
D) A radiation unit used to measure patient dose

Question 26

X-rays are a type of:

A) electricity.
B) microwave.
C) kinetic energy.
D) electromagnetic energy.

Question 27

In order to increase the penetration of the x-ray beam,which of the following factors should be increased?

A) Kilovoltage
B) Milliamperage
C) mAs
D) Exposure time

Question 28

The majority of radiography education programs today are based in:

A) proprietary schools.
B) hospitals.
C) clinics.
D) colleges.

Question 29

What is meant by R?

A) A radiation unit that is determined by measuring ionization of air
B) A device containing a crystal that absorbs radiation energy and discharges it in the form of light when heated
C) A factor that quantifies the relative health risks of various types of radiation
D) A radiation unit used to measure patient dose

Question 30

What is an Sv?

A) A radiation unit that is determined by measuring ionization of air
B) A device containing a crystal that absorbs radiation energy and discharges it in the form of light when heated
C) A radiation unit used to measure patient dose
D) A radiation unit used to measure dose equivalents for occupational exposure

Question 31

Which of the following substances is most readily penetrated by x-rays?

A) Water
B) Air
C) Bone
D) Fat

Question 32

Which of the following formulas represents the relationship between the wavelength,frequency,and velocity of an electromagnetic wave?

A)
B)
C)
D)

Question 33

An x-ray machine designed for direct viewing of the x-ray image is called a(n):

A) image receptor.
B) transformer.
C) control console.
D) fluoroscope.

Question 34

The frequency of an electromagnetic sine wave is defined as:

A) the distance from trough to crest.
B) the distance from one crest to the next.
C) the number of times per second that a crest passes a given point.
D) the velocity at which the wave travels through space.

Question 35

The container for the vacuum of the x-ray tube is made of:

A) glass.
B) aluminum.
C) tungsten.
D) carbon.