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Flashcards in Final Mock 2 Deck (94)
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0

Extra focal or off-focus radiation is produced from ______.

Rebounding electrons

1

The number of useful X-rays in the beam defines X-ray ______.

Quantity

2

The discrete portion of the X-Ray emission spectrum would change position with a charge in ______.

Target material

3

A low quality beam would also have low _____.

Penetrability

4

X-rays transmitted without interaction contribute to ______.

The image fog

5

High capacity tube rotors revolve at ______.

10,000 rpm

6

________ occurs only at the very high energies used in radiation therapy and in nuclear medicine PET imaging.

Pair production

7

Each tube has its own tube rating chart to show ______.

Maximum exposure times

8

Because of differential absorption, about ____ of the incident beam from the X-ray tube contributes to the finished image.

0.5%

9

An outer-shell electron is ejected and the atom is ionized with ______.

Compton interactions

10

The heel effect is caused by the ______.

Anode angle

11

The rotating anode is turned by a ______.

Magnetic field

12

The X-ray intensity is lower on the anode side of the ______.

Heel effect

13

Thermionic emission at the filament creates a ______.

Space charge

14

The main purpose of added filtration is to reduce ______.

Patient dose

15

The amplitude of the emission spectrum is ____ with a _____ generator than/as with a three-phase generator.

Lower; single-phase

16

Differential absorption is dependent on the ______, _____ and ______.

kVp of the exposure, atomic number of the absorber, and mass density of the absorber

17

If and exposure is 50 mR at an SID of 40 inches, what would the exposure be at an SID of 60 inches?

22.2 mR

18

A compensating filter is used to create ____ optical density with a body part of ____ thickness.

Uniform; non-uniform

19

The use of contrast agents increases the amount of _______.

Photoelectric absorption

20

Attenuation is caused by ______ and _______.

Absorption and scattering

21

Bremsstrahlung X-rays are produced by ______ at the target.

Slowing electrons

22

Characteristic K-shell X-rays have an effective energy of ___ keV.

69

23

Standard X-ray machines produce about __ mR/mAs at 70 kVp measured at 100 cm SID.

5

24

The cathode side of the tube should be towards the ____ part of the patient.

Thicker

25

X-ray intensity is proportional to ______.

kVp squared

26

Projectile electrons travel from ________.

Cathode to anode

27

The half value layer (HVL) of an X-ray beam is a measurement of beam ______.

Quality

28

The efficiency of X-ray production increases as _____ increases.

kVp

29

If 5% of an incident beam is transmitted through a body part, then 95% if that beam was _______.

Attenuated