Xray-grids, Filters, And Radiation Interactions

ask Adrian

pg133

The grid ratio is determined by dividing the height of the grid by the width of the grid. In this case, the height is 4cm and the width is 0.25cm. Dividing 4 by 0.25 gives us 16, so the grid ratio is 16:1.

Filtration refers to the process of selectively removing certain wavelengths or energies from a beam of radiation. This process is commonly used in medical imaging to reduce the amount of scattered radiation and improve image quality. "Hardening of the beam" is a term sometimes used to describe this process, as it implies that the beam becomes more focused and concentrated after filtration.

Added filtration occurs outside the tube housing. This refers to the process of filtering out low-energy x-ray photons from the x-ray beam. It is done by placing filters, such as aluminum or copper, in the path of the x-ray beam before it reaches the patient. These filters absorb the low-energy photons, reducing patient dose and improving image quality. This type of filtration is typically added to the x-ray tube housing, rather than being built-in or occurring within other components of the x-ray system.

Inherent filtration refers to the filtration that occurs naturally within the X-ray tube and housing. This means that as the X-ray beam passes through the tube and housing, some of the lower energy X-rays are absorbed, resulting in a beam with higher energy. This filtration helps to reduce patient dose and improve image quality by removing unnecessary low-energy X-rays. Therefore, the correct answer is inside the tube and housing.

Coherent interaction involves no energy transfer. In this type of interaction, the incident photon interacts with an atom or molecule without transferring any energy. Instead, it causes the atom or molecule to vibrate or rotate, resulting in the emission of a photon with the same energy and frequency as the incident photon. This interaction is characterized by the absence of energy loss or gain, making it the only option among the given choices that involves no energy transfer.

principles pg262

purple essentials pg 112

The correct answer is "number of grid lines per inch". Grid frequency refers to the number of grid lines present in a given area, specifically per inch. It is a measure of the density or spacing of the grid lines on a grid. The higher the grid frequency, the closer the grid lines are to each other, resulting in a finer grid pattern.

The interaction that involves an incident electron interacting with an inner shell electron is called a characteristic interaction. In this type of interaction, the incident electron collides with an electron in an inner shell of an atom, causing the inner shell electron to be ejected from the atom. This interaction is characteristic because it produces characteristic X-rays, which are unique to the atom and can be used to identify the element present.

Compensation filters are used in various imaging techniques to adjust for artifacts or distortions in the image. A wedge filter is commonly used to compensate for variations in X-ray beam intensity across the image, ensuring a more uniform exposure. On the other hand, a trough filter is used to compensate for variations in X-ray beam intensity along the length of the image, resulting in a more consistent image density. Therefore, both wedge and trough filters are examples of compensation filters. The other options, k-edge and thoraeus, are not commonly associated with compensation filters and are therefore not correct.