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Primary beam x-rays
- Because the lead strips in a focused grid are angled to match the divergence of the beam, most of the primary beam x-rays that are transmitted through the patient pass through the grid without being absorbed.
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Only X-rays transmitted through the grid are those that... From the primary beam X-ray travel in the direction of the interspace. Xrays that scatter obliquely through the interspace are...
X-ray scatter depends on several physical factors including: body habitus (increases with increased habitus), kVp, collimation (increases with increased kVp), air gap (decreases with increased air gap), and anti-scatter grids (decreases with increased grid ratio).
The antiscatter grid plays an important role for enhancing image quality in projection radiography by transmitting a majority of primary radiation and selectively rejecting scattered radiation. This device is comprised of a series of thin lead strips separated by radiolucent interspaces in a form-factor that matches the detector size.
Feb 6, 2015 · The only x-rays transmitted through a grid are those that travel straight in the direction of the interspace. X-rays that travel in an angle are absorbed by the radio-opaque material in the grid. Taken from Radiologic Science for technologists (10th ed.) (p. 195), by S.C. Bushong, 2013, St. Louis, MO: Mosby Elsevier.
Apr 15, 2019 · The higher the grid ratio, the less scattered radiation reaching the detector; conversely, the lower the grid ratio, the more primary X-rays transmitted through the grid. Thus, the use of grid with an incorrect ratio for a DR system leads to redundant doses or reduced contrast.
Apr 18, 2023 · 1. X-rays traveling through the patient may reach the image receptor unimpeded, or they may interact by one of two fundamental physical processes, the photoelectric effect or Compton scatter. a. X-rays that reach the image receptor without interacting with the patient are called primary x-rays (P). b.
