Patient Care in Radiography 9th Edition Ehrlich

Patient Care in Radiography 9th Edition Ehrlich Test Bank

Chapter 01: Introduction to Radiography

Ehrlich: Patient Care in Radiography: With an Introduction to Medical Imaging, 9th Edition

MULTIPLE CHOICE

1. X-rays were discovered in 1895 by:

• Coolidge.
• Crookes.
• Roentgen.
• Edison.

ANS: C REF: p. 2 OBJ: 1

• Of the following types of electromagnetic energy, which has the shortest wavelength?
• Radio waves
• X-rays
• Visible light
• Ultraviolet light

ANS: B REF: p. 7 OBJ: 7

• Which of the following is NOT an accurate statement regarding the characteristics of x-rays?
• They can penetrate matter that is impenetrable to light.
• They cause certain crystals to fluoresce.
• They can be refracted by a lens.
• They cannot be detecte

T d E b S y T th B e A hu N m K a S n E s L en L se E s R .ANS: C REF: pp. 7-8 OBJ: 8

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

• focusing cup.
• ampere.
• space charge.
• filament.

ANS: C REF: p. 6 OBJ: 6

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

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

ANS: D REF: p. 9 OBJ: 6

• 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:

• electron stream.
• x-ray beam.
• central ray. 1 / 4

• radiation field.

ANS: C REF: p. 8 OBJ: 10

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

• collimator.
• detent.
• tube housing.
• filter.

ANS: A REF: p. 8 OBJ: 11

8. The function of an x-ray grid is to:

• decrease patient radiation dose.
• increase radiographic resolution.
• increase radiographic contrast by reducing scatter radiation fog.
• increase radiographic density.

ANS: C REF: p. 14 OBJ: 11

9. The majority of radiography education programs today are based in:

• proprietary schools.
• hospitals.
• clinics.
• colleges.

ANS: D REF: p. 4 OBJ: 3

10. The container for the vacuTumESofTtBheAxN-KraSy EtuLbLe EisRm.aCdeOoMf:

• glass.
• aluminum.
• tungsten.
• carbon.

ANS: A REF: p. 5 OBJ: 4

11. X-rays are a type of:

• electricity.
• microwave.
• kinetic energy.
• electromagnetic energy.

ANS: D REF: p. 6 OBJ: 7

12. The frequency of an electromagnetic sine wave is defined as:

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

ANS: C REF: p. 6 OBJ: 9 2 / 4

• Which of the following formulas represents the relationship between the wavelength,

frequency, and velocity of an electromagnetic wave?

• f = λ  v
• V = λ  f
• Λ = f ÷ v
• f = λ ÷ v

ANS: B REF: p. 6 OBJ: 9

• Which of the following substances is most readily penetrated by x-rays?
• Water
• Air
• Bone
• Fat

ANS: B REF: p. 7 OBJ: 8

• Grids or buckys are generally used for body parts that measure greater than:
• 2 to 4 cm.
• 10 to 12 cm.
• 18 to 20 cm.
• 30 cm.

ANS: B REF: p. 15 OBJ: 11

• The access point for the radiographer to determine the exposure factors and to initiate the

exposure is called the:

• transformer.
• image receptor unit.
• control console.
• stationary grid.

ANS: C REF: p. 16 OBJ: 11

• An x-ray machine designed for direct viewing of the x-ray image is called a(n):
• image receptor.
• transformer.
• control console.
• fluoroscope.

ANS: D REF: p. 17 OBJ: 11

• A device located between the x-ray tube and the control panel that increases the voltage

delivered from the power company is called a:

• collimator.
• transformer.
• control console.
• fluoroscope.

ANS: B REF: p. 16 OBJ: 11

• The anode or positive end of the x-ray tube is the end that contains the: 3 / 4

• target.
• filament.
• focusing cup.
• space charge.

ANS: A REF: p. 6 OBJ: 5

• The inventor of the fluoroscope, who also investigated hundreds of fluorescent materials, was:
• Coolidge.
• Pupin.
• Roentgen.
• Edison.

ANS: D REF: p. 3 OBJ: 2

• The inventor of the hot cathode x-ray tube, the prototype of the x-ray tubes of today, was:
• Coolidge.
• Pupin.
• Roentgen.
• Edison.

ANS: A REF: p. 3 OBJ: 2

• / 4