Test Bank for Patient Care in Radiography 9th Edition by Ehrlich

MULTIPLE CHOICE

1. X-rays were discovered in 1895 by:
2. Coolidge.
3. Crookes.
4. Roentgen.
5. Edison.

ANS: C                   REF: p. 2                OBJ: 1

1. Of the following types of electromagnetic energy, which has the shortest wavelength?
2. Radio waves
3. X-rays
4. Visible light
5. Ultraviolet light

ANS: B                   REF: p. 7                OBJ: 7

1. Which of the following is NOT an accurate statement regarding the characteristics of x-rays?
2. They can penetrate matter that is impenetrable to light.
3. They cause certain crystals to fluoresce.
4. They can be refracted by a lens.
5. They cannot be detected by the human senses.

ANS: C                   REF: pp. 7-8           OBJ: 8

1. An electron cloud surrounding a hot cathode is referred to as a(n):
2. focusing cup.
3. ampere.
4. space charge.
5. filament.

ANS: C                   REF: p. 6                OBJ: 6

1. The purpose of rotating the x-ray tube target is to:
2. create a space charge.
3. remove long-wavelength photons from the x-ray beam.
4. focus the electron stream on a small target area.
5. increase the heat capacity of the anode.

ANS: D                   REF: p. 9                OBJ: 6

1. 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:
2. electron stream.
3. x-ray beam.
4. central ray.
5. radiation field.

ANS: C                   REF: p. 8                OBJ: 10

1. A device used to control the size of the radiation field is a:
2. collimator.
3. detent.
4. tube housing.
5. filter.

ANS: A                   REF: p. 8                OBJ: 11

1. The function of an x-ray grid is to:
   1. decrease patient radiation dose.
   2. increase radiographic resolution.
   3. increase radiographic contrast by reducing scatter radiation fog.
   4. increase radiographic density.

ANS: C                   REF: p. 14              OBJ: 11

1. The majority of radiography education programs today are based in:
2. proprietary schools.
3. hospitals.
4. clinics.
5. colleges.

ANS: D                   REF: p. 4                OBJ: 3

1. The container for the vacuum of the x-ray tube is made of:
2. glass.
3. aluminum.
4. tungsten.
5. carbon.

ANS: A                   REF: p. 5                OBJ: 4

1. X-rays are a type of:
2. electricity.
3. microwave.
4. kinetic energy.
5. electromagnetic energy.

ANS: D                   REF: p. 6                OBJ: 7

1. The frequency of an electromagnetic sine wave is defined as:
2. the distance from trough to crest.
3. the distance from one crest to the next.
4. the number of times per second that a crest passes a given point.
5. the velocity at which the wave travels through space.

ANS: C                   REF: p. 6                OBJ: 9

1. Which of the following formulas represents the relationship between the wavelength, frequency, and velocity of an electromagnetic wave?
2. f = λ ´v
3. V = λ ´f
4. Λ = f ÷ v
5. f = λ ÷ v

ANS: B                   REF: p. 6                OBJ: 9

1. Which of the following substances is most readily penetrated by x-rays?
2. Water
3. Air
4. Bone
5. Fat

ANS: B                   REF: p. 7                OBJ: 8

1. Grids or buckys are generally used for body parts that measure greater than:
2. 2 to 4 cm.
3. 10 to 12 cm.
4. 18 to 20 cm.
5. 30 cm.

ANS: B                   REF: p. 15              OBJ: 11

1. The access point for the radiographer to determine the exposure factors and to initiate the exposure is called the:
2. transformer.
3. image receptor unit.
4. control console.
5. stationary grid.

ANS: C                   REF: p. 16              OBJ: 11

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

ANS: D                   REF: p. 17              OBJ: 11

1. A device located between the x-ray tube and the control panel that increases the voltage delivered from the power company is called a:
2. collimator.
3. transformer.
4. control console.
5. fluoroscope.

ANS: B                   REF: p. 16              OBJ: 11