Test: CT quiz (employee training


CT quizVersión en línea Quiz we received in class por Joshua Liberty 1 An advantage of thinner CT Collimation is fewer streaking artifacts from high density objects. a True b False 2 An advantage of thinner CT Collimation is more quantum mottle. a True b False 3 mA affects total # x-rays produced. a True b False 4 Higher kVp advantages include greater x-ray penetration, less noise, less beam hardening, increased ability to differentiate tissue density. a True b False 5 Higher kVp disadvantages includes higher rad dose to patient. a True b False 6 In rotate stationary systems, the x-ray source is non moving within a rotating a True b False 7 In X-ray, denser tissues such as bone show dark on film or digital detectors and lungs, which are mainly air, appear to be white on the image. a True b False 8 Regarding X-rays, which are true? a Characteristic X-rays are variable b Bremsstrahlung interactions are discrete c The higher energy x-rays in the x-ray beam increase rad dose to patient but do not increase image quality d None of these 9 _____ produce variable energies from 0 KeV to a max defined by the maximum voltage or peak voltage applied between the filament and the target. a Characteristic X-rays b Bremsstrahlung interactions c EC interactions d None of these 10 The CT filter serves what purpose? a Stops low energy x-rays which do not add helpful information to the signal but raises rad dose b It makes energy distribution across CT detectors more homogeneous or consistent c Increases mAs and kVp d Stops low energy x-rays which do not add helpful information to the signal but raises rad exposure and it makes energy distribution across CT detectors more homogeneous or consistent e All of these 11 A collimated lead shutter is used to ? a Increase kVp b Decrease beam hardening c Avoid irradiating tissues other then those being imaged d None of these 12 The amount of electricity used to heat the filament wire and to boil off e- refers to? a kVp b mA c KeV d None of these 13 The peak voltage applied between the filament and the target is? a kVp b mA c KeV d None of these 14 The greater mAs results in? a More noise b Worse tissue contrast c Increased radiation dose to patient d Worse tissue contrast and increased radiation dose to patient e All of these 15 Heat is removed from the tungsten target by a _____ and by _____ which diffuses the heat and allows a small time interval for any one spot to cool down, before it serves again as the focus point of the e- beam. a Copper backing; rapid spinning of the target b Copper backing; Collimation c Lead shutter; rapid spinning of the target d None of these 16 Inside an X-ray vacuum tube, e- are boiled off an electronically heated _____, called the ______. a Target; anode b Filament wire; anode c Target; cathode d Filament wire; cathode 17 In a x-ray tube , e- are accelerated to high velocity toward the positively charged ____, the _____, by the high potential difference (or voltage) sustained between the filament and the target. a Tungsten target; anode b Tungsten target; cathode c Filament wire; cathode d Filament wire; anode 18 What is the purpose of pre patient CT collimator? a Sets slice thickness b Creates shape of fan beam c Reduces rad exposure to patient d Decreases beam hardening 19 How is slice thickness set in multi slice CT? a Pre patient collimator b Post patient collimator c Based on mAs and kVp d Adaptive array detector 20 On a CT, lower energies may be absorbed by body tissues while higher energy pass through causing an artifact. This is called ? a Beam hardening b Star artifact c mAs images distortion d Afterglow Feedback 4 Decreased ability to differentiate tissue density 6 X ray source rotates within a non moving ring of detectors. 7 Bone is denser and is white , where gaps like lungs are dark

1

An advantage of thinner CT Collimation is fewer streaking artifacts from high density objects.

a

True

b

False

2

An advantage of thinner CT Collimation is more quantum mottle.

a

True

b

False

3

mA affects total # x-rays produced.

a

True

b

False

4

Higher kVp advantages include greater x-ray penetration, less noise, less beam hardening, increased ability to differentiate tissue density.

a

True

b

False

5

Higher kVp disadvantages includes higher rad dose to patient.

a

True

b

False

6

In rotate stationary systems, the x-ray source is non moving within a rotating

a

True

b

False

7

In X-ray, denser tissues such as bone show dark on film or digital detectors and lungs, which are mainly air, appear to be white on the image.

a

True

b

False

8

Regarding X-rays, which are true?

a

Characteristic X-rays are variable

b

Bremsstrahlung interactions are discrete

c

The higher energy x-rays in the x-ray beam increase rad dose to patient but do not increase image quality

d

None of these

9

_____ produce variable energies from 0 KeV to a max defined by the maximum voltage or peak voltage applied between the filament and the target.

a

Characteristic X-rays

b

Bremsstrahlung interactions

c

EC interactions

d

None of these

10

The CT filter serves what purpose?

a

Stops low energy x-rays which do not add helpful information to the signal but raises rad dose

b

It makes energy distribution across CT detectors more homogeneous or consistent

c

Increases mAs and kVp

d

Stops low energy x-rays which do not add helpful information to the signal but raises rad exposure and it makes energy distribution across CT detectors more homogeneous or consistent

e

All of these

11

A collimated lead shutter is used to ?

a

Increase kVp

b

Decrease beam hardening

c

Avoid irradiating tissues other then those being imaged

d

None of these

12

The amount of electricity used to heat the filament wire and to boil off e- refers to?

a

kVp

b

mA

c

KeV

d

None of these

13

The peak voltage applied between the filament and the target is?

a

kVp

b

mA

c

KeV

d

None of these

14

The greater mAs results in?

a

More noise

b

Worse tissue contrast

c

Increased radiation dose to patient

d

Worse tissue contrast and increased radiation dose to patient

e

All of these

15

Heat is removed from the tungsten target by a _ and by _ which diffuses the heat and allows a small time interval for any one spot to cool down, before it serves again as the focus point of the e- beam.

a

Copper backing; rapid spinning of the target

b

Copper backing; Collimation

c

Lead shutter; rapid spinning of the target

d

None of these

16

Inside an X-ray vacuum tube, e- are boiled off an electronically heated _, called the __.

a

Target; anode

b

Filament wire; anode

c

Target; cathode

d

Filament wire; cathode

17

In a x-ray tube , e- are accelerated to high velocity toward the positively charged , the _, by the high potential difference (or voltage) sustained between the filament and the target.

a

Tungsten target; anode

b

Tungsten target; cathode

c

Filament wire; cathode

d

Filament wire; anode

18

What is the purpose of pre patient CT collimator?

a

Sets slice thickness

b

Creates shape of fan beam

c

Reduces rad exposure to patient

d

Decreases beam hardening

19

How is slice thickness set in multi slice CT?

a

Pre patient collimator

b

Post patient collimator

c

Based on mAs and kVp

d

Adaptive array detector

20

On a CT, lower energies may be absorbed by body tissues while higher energy pass through causing an artifact. This is called ?

a

Beam hardening

b

Star artifact

c

mAs images distortion

d

Afterglow

Feedback

4

Decreased ability to differentiate tissue density

6

X ray source rotates within a non moving ring of detectors.

7

Bone is denser and is white , where gaps like lungs are dark

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