Home └RT Digital Course └OOGA_Digital X-ray Chapter 5 DDA Baseline and Process Controls

RT Digital Course

0 %

Completed

Course content

OOGA_Digital X-ray Chapter 5 DDA Baseline and Process Controls

10 XP
Prev Next
Fullscreen Share
DDA PROCESS CONTROLS
Rating
0 0

There are no comments for now.

1. A motive for the performance evaluation on the Digital Detector Array (DDA) system may be:
Baseline testing Periodic frequency as required by Customer Suspect DDA performance All of the above None of the above
2. The type of material used for the Duplex Plate Phantom (DPP) shall be selected to:
Closely match the test article(s) material (same group) Match the energy used Match the inspection standard Be as cost effective as possible
3. Burn in and Lag measurements of the Digital Detector Array (DDA) are basically tests for:
Enhanced SNR of the DDA Enhanced CNR of the DDA Temporal properties of the DDA (residual image artifacts) Radio-durability
4. Digital Detector Array (DDA) characterization:
Should be verified immediately after purchase Must be initially evaluated by the purchaser and compared to other DDAs (via ASTM E2597 data) and the intended application. To reduce detector noise All of the above
5. Digital Detector Array (DDA) calibration is applied by use of imaging software to:
Correct for inconsistent pixel response. To correct for certain bad pixel. To reduce detector noise. All of the above
6. Digital Detector Array (DDA) gain and offset calibration shall be performed:
In accordance with the manufacturer’s recommendations At prescribed frequencies With alterations as needed All of the above
7. When new bad pixels that appear in the Area of Interest (AOI) and interfere with the inspection interpretation, a new
DDA must be installed Bad pixel map must be generated. kV must be selected mA must be selected
8. Material Thickness Range (MTR), that thickness range can be inspected
IQI>SNR CNR>GBV SNR>SR CNR>SNR
9. During the Signal-to-Noise Ratio (SNR) test, the measurements taken on the Duplex Plate Phantom (DPP) are __________ over the two separate Region of Interest ROI's.
Divided Averaged Integrated Subtracted
10. The SMTR (specific material thickness range) for a particular Digital Detector Array (DDA)
Could be considered the effective inspection range for the DDA Is the same for all detectors Is of no particular importance Only applies to DDAs using Csl conversion.
11. Contrast modulation of 20% is usually assumed to be the standard for
DWG wire pair visibility IQI hole perception RQI acceptance SNR validation
12. As a standard deviation (or sigma) in a given ROI in a DR image increases, the probable result in the image will be
increasing spatial resolution. increasing contrast sensitivity. decreasing contrast sensitivity. decreasing gray value.
13. A limiting factor of Contrast-to-Noise ratio (CNR) or Signal-to-Noise Ratio (SNR) may be related to:
DDA calibration quality IQI thickness IQI material type Focal spot size
14. CNR stands for
Cluster Noise Ratio Cluster Number Ratio Contrast to Noise Ratio Contrast to Noise Range
15. GBV stands for
Guided By Voices. Golden Boeing Value. Gender Based Violence Required contrast of the hole
16. If Contrast-to-Noise Ratio (CNR) is not measurable:
IQIs will be placed detector side IQIs need not be used Wire IQIs will instead be used SNR minimum of 130 and 250 for 2% and 1% contrast sensitivity, respectively, must be demonstrated
17. One common method of increasing Signal-to-Noise Ratio (SNR)/Contrast-to-Noise Ratio (CNR) in the digital image would be:
Double the kV Increase the SDD Increase frame averaging or integration (DDA settings) Replace the detector with CR IPs
18. Basic spatial resolutions (SRB) of a Digital Detector Array (DDA) or Computed Radiography (CR) system is determined by imaging and analyzing or interpolating the
image of the step wedge. DWG. RQI image of the IQI.
19. Digital Radiography (DR) production imaging can include _____________________ for initial or ongoing image validation or qualification.
RQI application dosimetry ROI application SMPTE pattern visibility
20. The SMPTE acronym stands for:
Society of Moving Pictures and Transportation Engineers Simple Moving Pixels and Twitter Engineering Society of Motion Picture and Television Engineers None of the above
21. Which material is not used for measuring Achievable Contrast Sensitivity (CSa)?
Aluminum Stainless Steel Titanium Inconel 718
22. Contrast resolution is a digital system’s ability to
record noise interference. separate structures from noise. show small differences in gray levels. none of the above.