Coherent Scattering (AKA: Thompson Scatter)
Takes place at low energy levels. The direction of the coherent scattering is forward, in the same general direction as the incoming x-ray beam.
The decrease in energy (increase in wavelength) of an X-ray or gamma ray photon, when it interacts with matter
When a specific area of interest is centered to the field and collimation technique is used. It is said to be
The range of distances within which the grid will not absorb an undue amount of useful radiation
The lead strips of the grid are aligned to the direction of the diverging primary x-ray beam
A device placed between the patient and the IR to absorb scatter radiation while permitting remnant radiation to pass through
Excessive absorption of useful radiation by the grid, and appears as decreased density on the side of the image
Since the grid absorbs some useful radiation, the radiographic image includes an image of the grid itself called
The lead strips of a focused grid are precisely aligned to the x-ray beam at a specific SID called the
The relationship between the height of the lead strips and the width of the spaces between them, which determines the effectiveness of the grid.
The incoming photon collides with an inner orbital electron of an atom. The photon is totally absorbed in the process and creates dose in the patient.
Secondary radiation which is produced by the body due to the photoelectric effect.
In the diagnostic range of kVp (50-100kVp) the majority of radiation interactions with the body are
Fog; Reduced contrast, Reduced recorded detail
Scattered radiation affects the radiographic image by causing
kVp; Field size
Name two factors that will affect eh quantity of scattered radiation fog on the radiograph
Clean up scattered radiation more effectively
As compared with an 8:1 ratio grid, a 12:1 ratio grid will
Lateral angulations, SID out of the focal range, or Position of the x-ray beam off center to one side of the grid will result in
The standard control limit for the x-ray tube's beam alignment is that the tube must be within __________ degree of perpendicular
Photoelectric interactions produce characteristic scatter radiation
Which type of radiation interaction produces scattered radiation that is characteristic of the subject irradiated?
When kVp is increased, will the quantity of secondary radiation fog be increased or decreased
103 lines per inch
What is the usual minimum frequency for a stationary grid in an upright grid cabinet
Normal radiographic density in the center and decreased density with lengthwise streaks and apparent grid lineson both sides
What is the typical radiographic appearance of grid cutoff caused by using an SID that is outside the grid's focal range
Increased image quality on the spot film
How might the image of a vertebra on a "spot film" differ from on a 35-43cm radiograph of the spine