Image evaluation

Question 1

Which technical factor is used to alter radiographic contrast?

Answer 1

kVp

Question 2

Each square picture element in a digital viewing monitor is called a?

Answer 2

pixel

Question 3

The geometric factors that affect the formation of the image are 1. SID 2. OID 3. focal spot

Answer 3

1.SID 2.OID 3.focal spot

Question 4

The maximum heat capacity of the anode of the x-ray tube is rated in terms of?

Answer 4

heat units

Question 5

What is the purpose of the filament circuit?

Answer 5

supplies the heat required by the x-ray tube filament for thermionic emission of electrons

Question 6

What is the correct exposure time required to produce 50 mAs when using 200 mA station?

Answer 6

0.25 seconds

Question 7

Which of the following components is located on the low voltage side of the x-ray circuit? 1. kVp selector 2. autotransformer 3. step-up transformer

Answer 7

1.kVp selector 2.autotransformer

Question 8

The greatest spatial resolution will be produced when the matrix is ________ and the pixels are _____.

Answer 8

large ; small

Question 9

Contrast is directly influenced by 1. SID 2. fog 3. collimation

Answer 9

2.fog 3.collimation

Question 10

Which of the following tells the operator that the correct exposure has been received by the phosphors in the imaging plate?

Answer 10

exposure indicator number

Question 11

Which of the following X-ray generators produces the greatest amount of x-rays for the same exposure technique?

Answer 11

high frequency

Question 12

Which of the following will increase spatial resolution? 1. Increase SID 2. Increase OID 3. Decrease in focal spot size

Answer 12

1 and 3 only

Question 13

The overall darkness or blackness in an image is referred to as?

Answer 13

density

Question 14

When it is necessary to differentiate tissues with similar tissue densities, which of the following image quality factors is most desirable?

Answer 14

High contrast

Question 15

Which of the following transformers reduces the voltage on the secondary side to provide an appropriate current to heat the filament?

Answer 15

Step- down transformer

Question 16

Which of the following pathologic conditions require a decrease in exposure technique? 1. multiple myeloma 2. emphysema 3. osteoporosis

Answer 16

1, 2 and 3

Question 17

Which of the following is the function of the autotransformer? 1. Provides the means for variable kVp selection 2. Provides compensation for fluctuations in the incoming line voltage 3. Supplies power to the other parts of the x-ray circuit

Answer 17

1,2 and 3

Question 18

A charged coupled device (CCD) is used in an indirect conversion DR system to?

Answer 18

Convert light to an electrical signal

Question 19

Which control on the viewing station controls the density or brightness of an image?

Answer 19

Window level

Question 20

Which of the following if increased, will result in increased radiographic density? 1. increased mA 2. increased exposure time 3. increased kVp

Answer 20

1,2 and 3

Question 21

Which of the following is located on the low-voltage side of the x-ray circuit and functions to measure the voltage output from the autotransformer?

Answer 21

exposure timer

Question 22

Which quality factor is a key to visibility of detail?

Answer 22

Focal spot size