Developing a technique Chart Chapter 9 Technique chart

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. – Without would have to calculate new technique each time a radiograph was taken.

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

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

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.

Exposure Factors • Exposure factors – KVp- use Santes’ rule • (2 x tissue thickness in cm) + 40 inches=k. Vp – m. As- 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

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

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