V1 - Image Production Flashcards
Which digital post-processing results in black background surrounding the original collimated edges?
Shuttering
Which calculation is used to determine grid ratio?
Height of the lead strips divided by the width of the interspace material
image Consider the AP mobile chest image. What will improve the photographic quality of this image?
Using a grid
What is the longest field size dimension allowable for 10 inches by 12 inches collimation at a 40 inch SID?
12.8 inches
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?
Selecting only the detector on the left side
Which changes should be made when performing an abdomen radiograph on a patient with ascites?
Raise exposure factors
Which digital communication network is used to store patient billing information?
HIS
image consider this lateral lumbar spine image. Which strategy will have the greatest improvement on image quality?
Immobilize the patient
How often should lead aprons be evaluated to determine if cracks or holes are present?
Annually
Who judges radiographic images for quality? (4 answers)
- Radiologists
- Radiographers
- Quality Control Radiologists
- Ordering Physicians
Why should a radiographer routinely use a small focal spot when imaging extremities?
Increase in spatial resolution
Which change in technical factors is most likely to result in decreased exposure to the IR?
Increase grid ratio
Without changing any other factors, which effect is caused by decreasing the field size from 14x17 inches to 8x10 inches?
Decrease in the amount of scatter radiation within the part
What is the term for the adjustment of image brightness, regardless of exposure received?
Rescaling
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?
100 mA, 1/20 s, 110 kVp
image Study the provided filament thermal emissions chart. Note the distinct shoulder on each kVp curve. What do these shoulder indicate?
The space charge limited region
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?
Filament Circuit
What do limiting spatial resolution (LSR) and modulation transfer function (MTF) have in common?
They both measure spatial resolution in digital imaging
Which device temporarily stores an electric charge?
Capacitor
Which system can store images?
PACS
Which technique mimics the use of a grid?
Increased OID
Which standard governs communication between the system that contains the patient’s full medical information and the system has radiology-specific data?
Health level 7 (HL-7)
Which pathologic condition requires a reduction in exposure factors to produce an acceptable image?
Emphysema
Which x-ray beam characteristic is reduced by adding aluminum filtration?
Quantity of x-rays
How does the density log Exposure (D log E) curve appear for a digital IR?
A straight line at a 45 degree angle
How can magnification of the heart be reduced when performing a chest x-ray
Use a 72 inch SID
On which system does hospital staff input new orders for radiologic examinations?
HIS
Picture archiving and communication system (PACS) networks are capable of performing which functions? (2 answers)
- Transmitting diagnostic images to remote work stations
- Downloading images from different imaging modalities
Which action can improve record detail?
Increase SID
What is the function of a rectifier?
Converting alternating current to pulsating direct current
What are recommended uses of digital annotation tool? (4 answers)
- Indicating radiographer performing the exam
- Indicating date or time of exam
- Labeling CR projection
- Entering technical factors.
A radiographer performing a forearm exam on a patient with advanced Parkinson’s Disease. Which technical factor adjustments should be used?
Decrease the exposure time to reduce risk of patient motion
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.
8 > 10 > 12 > 14
An increase in which factor will improve spatial resolution?
SID
Where is edge enhancement post processing most helpful in digital radiography?
Low contrast situations
Which identifying information is important to include on each digital image? (3 answers)
- Health care facility
- Patient’s DOB
- Patient’s name
Why should computed radiography (CR) image receptors (IR) be erased if they haven’t been used?
Remove fog from background radiation
Which statement is true regarding exposure indicator and the evaluation of digital images?
Exposure indicator must be reviewed with every image and must fall within the manufacturer’s acceptable range
Which technique produces a 2 milliroentgens (mR) exposure to an IR plate if 70 kVp at 25 mAs produces 1.6 mR?
70 kVp at 31.25 mAs
What is the result if pixel bit depth is decreased?
Contrast resolution is decreased
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?
The grid had a frequency similar to the reader’s sampling frequency
What is the most likely reason for the increase in quantum noise on a computed radiography (CR) image?
Lower than required mAs
Which is most likely cause of a histogram error?
Selection of an incorrect exam from the LUT
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?
Line compensator
Which steps increase contrast in fluoroscopy? (2 answers)
- Reduce kVp
- Smaller collimator field
Which information in the patient history should prompt the radiographer to decide against using AEC when taking chest x-ray?
Emphysema
How does an increase in noise affect the quality of the digital image?
Contrast is decreased
How is signal maximized to a digital image receptor?
Longer exposure time
The radiographer is using ABC during fluoroscopy. What change in patient exposure should the radiographer expect as the patient size increases?
Increase in exposure
Which step will reduce digital image noise, assuming no other changes?
Longer exposure time
