20 Questions
Which of the following is a factor that affects scatter radiation?
Tissue Thickness
What is the purpose of using grids in radiographic imaging?
To increase the contrast resolution
What is the Scatter-Remnant Beam Ratio (S/R Ratio) used to describe?
The proportion of scattered photons exiting the patient relative to the number of photons exiting the patient on their initial trajectory
What is the impact of scatter radiation on contrast resolution?
It decreases the contrast resolution
What is the primary effect of scatter radiation on the image quality?
It adds noise to the image
What is the purpose of beam restricting devices in radiographic imaging?
To increase the sharpness of the image
What is the abbreviation P.B.L stand for in radiographic imaging?
Primary Beam Limitation
What is the impact of aggressive field collimation and the use of grids on scatter radiation?
They decrease the amount of scatter radiation
What are the contrast areas on an x-ray image?
Areas of light, dark, and shades of gray
What is the average Scatter-Remnant Beam Ratio (S/R Ratio) for an abdomen x-ray of an average patient of 20 cm thickness?
3:1
Which type of radiation is grids designed to absorb?
Scattered radiation
What material is used for the radiopaque strips in a grid?
Lead (Pb)
What is the general rule for using a grid?
Use a grid with thicker, larger body parts and high kVp techniques.
Where is the grid located in relation to the object (patient) and the image receptor (IR)?
Between the object (patient) and the IR
What is the function of an antiscatter grid?
To improve radiographic contrast by absorbing unwanted scatter radiation
Can collimation be increased beyond its automatic limit?
No, collimation cannot be increased beyond its automatic limit
What is the purpose of using beam restriction devices?
To limit the size of the x-ray beam and reduce patient dose
Where are the radiolucent strips located in a grid?
Alternating with the radiopaque strips
What determines the grid design?
The principles of photon path and divergence
Where is the grid located in a bucky tray?
Reciprocating in a bucky tray
Test your knowledge on the effects of scatter, factors affecting scatter, and the use of beam restricting devices and grids in radiographic imaging. Assess your understanding of contrast, contrast areas on the x-ray image, and contrast resolution.
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