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HESI RAD Practice > V1 - Image Production > Flashcards

V1 - Image Production Flashcards

1
Q

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

A

Shuttering

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2
Q

Which calculation is used to determine grid ratio?

A

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

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3
Q

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

A

Using a grid

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4
Q

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

A

12.8 inches

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5
Q

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?

A

Selecting only the detector on the left side

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6
Q

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

A

Raise exposure factors

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7
Q

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

A

HIS

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8
Q

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

A

Immobilize the patient

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9
Q

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

A

Annually

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10
Q

Who judges radiographic images for quality? (4 answers)

A
  • Radiologists
  • Radiographers
  • Quality Control Radiologists
  • Ordering Physicians
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11
Q

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

A

Increase in spatial resolution

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12
Q

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

A

Increase grid ratio

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13
Q

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

A

Decrease in the amount of scatter radiation within the part

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14
Q

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

A

Rescaling

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15
Q

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?

A

100 mA, 1/20 s, 110 kVp

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16
Q

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

A

The space charge limited region

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17
Q

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?

A

Filament Circuit

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18
Q

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

A

They both measure spatial resolution in digital imaging

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19
Q

Which device temporarily stores an electric charge?

A

Capacitor

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20
Q

Which system can store images?

A

PACS

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21
Q

Which technique mimics the use of a grid?

A

Increased OID

22
Q

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

A

Health level 7 (HL-7)

23
Q

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

A

Emphysema

24
Q

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

A

Quantity of x-rays

25
Q

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

A

A straight line at a 45 degree angle

26
Q

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

A

Use a 72 inch SID

27
Q

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

A

HIS

28
Q

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

A
  • Transmitting diagnostic images to remote work stations

- Downloading images from different imaging modalities

29
Q

Which action can improve record detail?

A

Increase SID

30
Q

What is the function of a rectifier?

A

Converting alternating current to pulsating direct current

31
Q

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

A
  • Indicating radiographer performing the exam
  • Indicating date or time of exam
  • Labeling CR projection
  • Entering technical factors.
32
Q

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

A

Decrease the exposure time to reduce risk of patient motion

33
Q

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.

A

8 > 10 > 12 > 14

34
Q

An increase in which factor will improve spatial resolution?

A

SID

35
Q

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

A

Low contrast situations

36
Q

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

A
  • Health care facility
  • Patient’s DOB
  • Patient’s name
37
Q

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

A

Remove fog from background radiation

38
Q

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

A

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

39
Q

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

A

70 kVp at 31.25 mAs

40
Q

What is the result if pixel bit depth is decreased?

A

Contrast resolution is decreased

41
Q

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?

A

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

42
Q

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

A

Lower than required mAs

43
Q

Which is most likely cause of a histogram error?

A

Selection of an incorrect exam from the LUT

44
Q

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?

A

Line compensator

45
Q

Which steps increase contrast in fluoroscopy? (2 answers)

A
  • Reduce kVp

- Smaller collimator field

46
Q

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

A

Emphysema

47
Q

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

A

Contrast is decreased

48
Q

How is signal maximized to a digital image receptor?

A

Longer exposure time

49
Q

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

A

Increase in exposure

50
Q

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

A

Longer exposure time

HESI RAD Practice (12 decks)

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