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Interaction of X-rays with tissues
Photoelectric absorption- A photon of electromagnetic energy ejects an electron from an inner shell of an atom.
- The displaced electron can ionize other atoms.
- An electron from a higher orbiting shell drops into the vacant space releasing energy ’Characteristic radiation.
Features of photoelectric absorption- Important at low energy.
- Proportional to cube of atomic number ’ small variation in atomic number ie in body tissue ’ large contrast in film exposure.
Photoelectric absorption is important at kV<100 and at high kV reduced film contrast occurs because photoelectric effect less important.
Compton absorption- A photon of electromagnetic energy interacts with a loosely bound electron in the outer shell of an atom.
- The photon displaces the loosely bound electron which can ionize other atoms.
- The photon is diverted and continues in a different direction with a lower energy ’Scattered radiation.
Features of Compton absorption- Increases with increasing energy.
- As energy increases more of scattered radiation is directed in a forward direction, ie more likely to reach x-ray film.
- Independent of atomic number of tissue.
Compton scatter is significant at kV>70 and in tissue of low atomic number, ie most body tissue.
Production of scatter
- Scatter is produced when x-rays interact with matter.
- Lower energy than primary beam.
- Travel in any direction.
- Very important inlarge animal radiography.
- At high kV less of the primary beam is converted to scatter but more scattered radiation is moving forward towards the film.
- Increases with increasing volume of tissue irradiated.
Effects of scatter- Increases radiation exposure to personnel.
- Increases radiation dose to patient.
- Reduces film contrast (increases overall film density in a non-specific way).
Scatter reduction
Reduce scatter productionCollimate x-ray beam- Reduces the radiation dose reaching the patient and therefore the volume of tissue being irradiated.
Compress patient- Reduces volume of tissue irradiated.
- Can be achieved using Bucky band - a webbing strap which can be tightened around the body (particularly abdomen).
Reduce kVReduce scatter affecting filmGrids- Placed between film and patient to absorb scatter.
- Most scatter is travelling in an oblique direction and therefore is unable to pass through grid.
- Results in increased exposure factors required.
- Grid lines can appear on film.
Alternative filtration devices- Air gap between patient and film:
- Radiation travelling obliquely misses film.
- Important in large animal radiography where film is often some distance from object.
- Air gap increases magnification and reduces image sharpness.
- Filter between patient and film:
- Intensifying screens act as a filter.
Not practical since primary beam also significantly attenuated by filter.
Lead backing to film cassettes
- Absorbs any radiation penetrating film.
- Prevents back scatter.
Reduce effects of scatter on film
- Intensifying screens (particularly rare earth) intensify primary photons more than scatter.
- Screens also increase gamma so that film contrast is enhanced and effect of scatter is reduced.
Grids
- Increase film contrast by reducing general fog of film.
Construction- Parallel strips of lead (0.05 mm wide) separated by radiolucent interspacers (plastic with aluminium surround).
- With 20-28 strips per cm.
- Primary radiation beam is travelling vertically and passes through interspaces.
- Scattered radiation, travelling obliquely, cannot penetrate lead.
Linear grid- Lead strips are parallel and equal height across the grid.
- At edge of film radiation beam is diverging and obliquely moving photons are absorbed.
- Reduced exposure density at periphery of film.
Focussed grid- Lead strips are angled from center outwards.
- This accomodates for the diverging pattern formed by the primary beam.
- Center of x-ray beam must pass through center of grid.
- Must be used right way up!
- Pseudofocussed gridshave shorter lead strips at edges than in middle.
Crossed grid- Two grids of low grid ratio at right angles to one another.
- Central axis of incident beam perpendicular to the grids.
Moving grid- Blurs grid lines by moving grid across film during exposure.
- Grid must move 3-4 interspaces to be effective.
- Need special x-ray table and Bucky linked to machine so that movement of grid linked to exposure.
Single stroke- Grid pulled at uniform speed across film.
- Moves about 2.5 cm in 0.2-15 seconds.
Oscillating- Grid moves backwards and forwards during exposure.
- Moves 1.25 cm either side of center over 0.5 seconds.
CharacteristicsGrid ratio- The higher the ratio the more scatter is absorbed.
Grid factor- How much the exposure factors must be raised to compensate for use of grid.
- Depends on:
- Number of lead strips per cm.
- Thickness of strips.
- Determined by taking x-ray and noting exposure ’ add grid and increase exposure to get back to same intensity.
- Usually 2.5-3.
Contrast improvement ratio
- Measures the improvement in contrast created by using a grid.
- Calculated by dividing film contrast with a grid by that without.
- Usually 1.5-3.5.