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Developing a technique Chart Chapter 9

Developing a technique Chart Chapter 9. Technique chart . A valuable resource for a radiographer. Helps to provide a constant method of choosing the proper exposure factors to create a diagnostic radiograph. Is created on the basis of thickness of the area to be examined.

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Developing a technique Chart Chapter 9

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  1. Developing a technique ChartChapter 9

  2. Technique chart • A valuable resource for a radiographer. • Helps to provide a constant method of choosing the proper exposure factors to create a diagnostic radiograph. • Is created on the basis of thickness of the area to be examined. • Without would have to calculate new technique each time a radiograph was taken.

  3. Every x-ray machine is different • Each machine should have its own formulated technique chart. • Each machine varies in quality and quantity. • Other factors that influence the chart: • Speed of screens • Age of screens • Speed of film • SID • Amount of beam filtration • Temperature and time of film processing • Type of grid

  4. Technique charts continued • May have to have several charts for same machine. • Based on what is being used for radiograph • Based on area of radiological examination

  5. Technique Chart Formulation • May have to have some trials with patients. Generally can use an adult dog weighing approximately 50 lbs. • Large cassette should be used. • Medium speed film should be used.

  6. Exposure Factors • Exposure factors • KVp- use Santes’ rule • (2 x tissue thickness in cm) + 40 inches=kVp • mAs- screen type should be taken into account: • Fast screen: 2.5 to 10 • Medium (par speed): 5 to 12.5 • Slow (ultradetail): 30 to 40

  7. Handout on Creating a Technique Chart • We take in consideration desired mAs, what we are radiographing, as well if a grid is being used.

  8. Please refer to book and handout for examples of producing a technique chart.

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