Lab 3 Flashcards
As per Safety Code 35, what is the recommended retake rate for a medical radiological department?
5%
As per Safety Code 35, what is the recommended frequency for CR plate cleaning?
Monthly
This image was acquired using the table-bucky with a grid frequency of 80lp/cm and processed with laser read out running perpendicular to the grid lines. What artifact is seen in the attached image?
Grid Lines
The attached image was obtained on a CR image receptor. What artifact is seen?
Double Exposure
What artifact is seen in the attached image?
Dust on light guide in processor
The attached image was obtained on a CR imaging system in the table bucky, using a grid frequency of 80 lines/cm and processed with a laser read out running perpendicular to the grid lines. The x-ray tube was centered, in focus and the gird was properly aligned.
What is the name of the alternating dark and light line artifact seen throughout the image?
Moire’ Pattern due to Aliasing
The attached image was obtained on a CR imaging system in the table bucky, using a grid frequency of 80 lines/cm and processed with a laser read out running perpendicular to the grid lines. The x-ray tube was centered, in focus and the gird was properly aligned.
Would this artifact have occurred during image processing or image acquisition?
Image processing
The attached image was obtained on a CR imaging system in the table bucky, using a grid frequency of 80 lines/cm and processed with a laser read out running perpendicular to the grid lines. The x-ray tube was centered, in focus and the gird was properly aligned.
State the cause of the artefact.
The sampling frequency/rate of the laser was less than double the desired maximum spatial frequency.
What is the cause of the artifact seen in the attached image captured on a CR plate?
Exposure through the back of the CR plate
What is the cause of the artifact seen in the
attached image?
Upside-down focused grid resulting in grid cut-off
What is the cause of the artifact (red circle) seen
in the attached image?
Back scatter from high technique and reduced shielding on back of detector
What artifact is seen in the attached DR image?
Speckle
Aside from the surgically implanted hardware, what artifact is seen in the attached image?
Quantum mottle from underexposure
What artifact is seen superimposed over the scapula and lateral chest wall in the attached image?
Patient artifact (bra straps)
Based on the retake data provided what is the retake rate among upper limb x-rays performed at this facility?
6%
Based on the retake data provided which of the following has contributed to the highest causal rate?
Overexposure
Based on the retake data provided which of the following examinations has the highest retake rate?
Plain Abdomen
Based on the retake data provided which of the following is the highest contributor to the examination with the highest retake rate?
a. Overexposure
b. Positioning Fault
c. Underexposure
d. Processing Fault
Underexposure
Based on the retake data provided is this facility overperforming or underperforming when considering the retake rate recommended by Safety Code 35?
Underperforming (doing worse)
