RAD 207: RT

Question 1

Increased part thickness equals:

Accepted Answer

increased beam attenuation

Question 2

The set of numeric values that are stored in a computer, and used in all digital images, is:

Accepted Answer

A Matrix

Question 3

The percentage of x-rays that have reached the detector & have been captured is the:

Accepted Answer

Fill factor

Question 4

Principal source of noise in CR is:

Accepted Answer

Scatter

Question 5

The highest energy of an x-ray produced with 85 kVp will be:

Accepted Answer

85 kVp

Question 6

The stimulating light used in CR processing is from the :

Accepted Answer

Laser

Question 7

What term is used to describe the percentage of the pixel face that is sensitive to x-rays?

Accepted Answer

Fill factor

Question 8

Which of the following is not a step in digitizing an image?

Accepted Answer

Reading

Question 9

Which layer of the film contains crystals in gelatin that serve as latent image centers?

Accepted Answer

Emulsion

Question 10

The ratio of x-rays incident on the input phosphor to light exiting the output phosphor is:

Accepted Answer

flux gain

Question 11

The photocathode converts __ to electrons

Accepted Answer

visible light

Question 12

What is the appropriate change in mAs if kVp is decreased by 15% to maintain density

Accepted Answer

double the mAs

Question 13

What is the result of imaging a thicker part or patient?

Accepted Answer

more Compton interactions

Question 14

The decreasing intensity with increasing distance from the source follows which law?

Accepted Answer

Inverse Square Law

Question 15

A disadvantage of using magnification during fluoroscopy is:

Accepted Answer

patient receives increased dose

Question 16

The energy of an individual x-ray photon is measured in:

Accepted Answer

electron volts

Question 17

As mAs is increased, the SNR is:

Accepted Answer

increased

Question 18

The input phosphor converts __ to light

Accepted Answer

x-rays

Question 19

The ability to distinguish many shades of gray from black to white is called:

Accepted Answer

Contrast Resolution

Question 20

The most common cause for repeats when using AEC is inaccurate:

Accepted Answer

centering

Question 21

A ghost image can occur in digital imaging because of:

Accepted Answer

Incomplete erasure

Question 22

Which of the following is the most important skill to perform when using AEC?

Accepted Answer

Proper positioning

Question 23

Which of the following is prevented by flooding the erased IP with bright light?

Accepted Answer

Ghosting

Question 24

"Interrogation time" is the time:

Accepted Answer

needed to switch on the x-ray tube

Question 25

Which of the following is the most common contrast material used in DSA?

Accepted Answer

Iodine

Question 26

The x-ray beam that leaves the patient and interacts with the IR is the:

Accepted Answer

remnant radiation

Question 27

Each capacitor in a CCD represents a(n):

Accepted Answer

pixel

Question 28

An image that shows vignetting:

Accepted Answer

Is dim at the periphery

Question 29

"DQE" stands for:

Accepted Answer

Detective Quantum Efficiency

Question 30

An x-ray beam that has many different energies is:

Accepted Answer

heterogeneous

Question 31

The averaging of pixel values surrounding a defective pixel is known as:

Accepted Answer

Signal interpolation

Question 32

The ability to resolve & render small, high-contrast objects on an image is:

Accepted Answer

Spatial Resolution

Question 33

Which of the following determines spatial resolution in CR?

Accepted Answer

Laser beam diameter

Question 34

The margin for error in technique setting that a system will allow is called its:

Accepted Answer

Exposure latitude

Question 35

Tungsten has a _ atomic number and a _ melting point

Accepted Answer

high; high

RAD 207: RT

Questions 35

RAD 207: RT

Questions 35