V1 - Image Production

Question 1

Which digital post-processing results in black background surrounding the original collimated edges?

Answer 1

Shuttering

Question 2

Which calculation is used to determine grid ratio?

Answer 2

Height of the lead strips divided by the width of the interspace material

Question 3

image Consider the AP mobile chest image. What will improve the photographic quality of this image?

Answer 3

Using a grid

Question 4

What is the longest field size dimension allowable for 10 inches by 12 inches collimation at a 40 inch SID?

Answer 4

12.8 inches

Question 5

Prior to performing a PA chest projection with AEC, the radiographer discovers that the patient has had a right total pneumonectomy. Which technical consideration should be considered?

Answer 5

Selecting only the detector on the left side

Question 6

Which changes should be made when performing an abdomen radiograph on a patient with ascites?

Answer 6

Raise exposure factors

Question 7

Which digital communication network is used to store patient billing information?

Answer 7

HIS

Question 8

image consider this lateral lumbar spine image. Which strategy will have the greatest improvement on image quality?

Answer 8

Immobilize the patient

Question 9

How often should lead aprons be evaluated to determine if cracks or holes are present?

Answer 9

Annually

Question 10

Who judges radiographic images for quality? (4 answers)

Answer 10

• Radiologists
• Radiographers
• Quality Control Radiologists
• Ordering Physicians

Question 11

Why should a radiographer routinely use a small focal spot when imaging extremities?

Answer 11

Increase in spatial resolution

Question 12

Which change in technical factors is most likely to result in decreased exposure to the IR?

Answer 12

Increase grid ratio

Question 13

Without changing any other factors, which effect is caused by decreasing the field size from 14x17 inches to 8x10 inches?

Answer 13

Decrease in the amount of scatter radiation within the part

Question 14

What is the term for the adjustment of image brightness, regardless of exposure received?

Answer 14

Rescaling

Question 15

image A radiographic rating chart is provided for a portable unit. Which combination of mA, seconds, and kVp is permissible for a single exposure according to the chart?

Answer 15

100 mA, 1/20 s, 110 kVp

Question 16

image Study the provided filament thermal emissions chart. Note the distinct shoulder on each kVp curve. What do these shoulder indicate?

Answer 16

The space charge limited region

Question 17

Which part of the x-ray circuit is controlled by adjusting the mA setting on the operating console for the purpose of producing the heat necessary for thermionic emission?

Answer 17

Filament Circuit

Question 18

What do limiting spatial resolution (LSR) and modulation transfer function (MTF) have in common?

Answer 18

They both measure spatial resolution in digital imaging

Question 19

Which device temporarily stores an electric charge?

Answer 19

Capacitor

Question 20

Which system can store images?

Answer 20

PACS

Question 21

Which technique mimics the use of a grid?

Answer 21

Increased OID

Question 22

Which standard governs communication between the system that contains the patient’s full medical information and the system has radiology-specific data?

Answer 22

Health level 7 (HL-7)

Question 23

Which pathologic condition requires a reduction in exposure factors to produce an acceptable image?

Answer 23

Emphysema

Question 24

Which x-ray beam characteristic is reduced by adding aluminum filtration?

Answer 24

Quantity of x-rays

Question 25

How does the density log Exposure (D log E) curve appear for a digital IR?

Answer 25

A straight line at a 45 degree angle

Question 26

How can magnification of the heart be reduced when performing a chest x-ray

Answer 26

Use a 72 inch SID

Question 27

On which system does hospital staff input new orders for radiologic examinations?

Answer 27

HIS

Question 28

Picture archiving and communication system (PACS) networks are capable of performing which functions? (2 answers)

Answer 28

- Transmitting diagnostic images to remote work stations | - Downloading images from different imaging modalities

Question 29

Which action can improve record detail?

Answer 29

Increase SID

Question 30

What is the function of a rectifier?

Answer 30

Converting alternating current to pulsating direct current

Question 31

What are recommended uses of digital annotation tool? (4 answers)

Answer 31

- Indicating radiographer performing the exam - Indicating date or time of exam - Labeling CR projection - Entering technical factors.

Question 32

A radiographer performing a forearm exam on a patient with advanced Parkinson's Disease. Which technical factor adjustments should be used?

Answer 32

Decrease the exposure time to reduce risk of patient motion

Question 33

Place these bit depths in order from one that will produce the least number of grays to the one that will produce the greatest number of grays.

Answer 33

8 > 10 > 12 > 14

Question 34

An increase in which factor will improve spatial resolution?

Answer 34

SID

Question 35

Where is edge enhancement post processing most helpful in digital radiography?

Answer 35

Low contrast situations

Question 36

Which identifying information is important to include on each digital image? (3 answers)

Answer 36

- Health care facility - Patient's DOB - Patient's name

Question 37

Why should computed radiography (CR) image receptors (IR) be erased if they haven't been used?

Answer 37

Remove fog from background radiation

Question 38

Which statement is true regarding exposure indicator and the evaluation of digital images?

Answer 38

Exposure indicator must be reviewed with every image and must fall within the manufacturer's acceptable range

Question 39

Which technique produces a 2 milliroentgens (mR) exposure to an IR plate if 70 kVp at 25 mAs produces 1.6 mR?

Answer 39

70 kVp at 31.25 mAs

Question 40

What is the result if pixel bit depth is decreased?

Answer 40

Contrast resolution is decreased

Question 41

A radiographer makes an exposure using an 8:1, 100 line per inch grid. When processing the image plate (IP) through the reader, the radiographer notices that a Moire pattern is seen on the displayed image. What is the probable cause of this artifact?

Answer 41

The grid had a frequency similar to the reader's sampling frequency

Question 42

What is the most likely reason for the increase in quantum noise on a computed radiography (CR) image?

Answer 42

Lower than required mAs

Question 43

Which is most likely cause of a histogram error?

Answer 43

Selection of an incorrect exam from the LUT

Question 44

X-ray machines are designed to operate at a specific and continuous supply voltage. Which part of the imaging system is responsible for keeping incoming voltage adjusted to the proper value?

Answer 44

Line compensator

Question 45

Which steps increase contrast in fluoroscopy? (2 answers)

Answer 45

- Reduce kVp | - Smaller collimator field

Question 46

Which information in the patient history should prompt the radiographer to decide against using AEC when taking chest x-ray?

Answer 46

Emphysema

Question 47

How does an increase in noise affect the quality of the digital image?

Answer 47

Contrast is decreased

Question 48

How is signal maximized to a digital image receptor?

Answer 48

Longer exposure time

Question 49

The radiographer is using ABC during fluoroscopy. What change in patient exposure should the radiographer expect as the patient size increases?

Answer 49

Increase in exposure

Question 50

Which step will reduce digital image noise, assuming no other changes?

Answer 50

Longer exposure time