These charts provide techniques for chest, extremities, joints, spines, ribs, skull, sinus, facial bones, children and babies, abdomen with/without barium. Charts for common film/screen and digital imaging are included with instructions on how to customize for your environment.
Many technique variables can be standardized, SID, Grid, kVp, mA, film/screen speed or digital system. After this, 85% of changes in technique are for patient or part thickness related to mAS and Time. These can be predicted and charted! (Or automated) Start with one of our typical charts film-based or digital. Do some trial exposures. Create a water-filled “phantom” and follow the instructions. Or start with known techniques, PA Chest (25 cm); Extremity (6 cm); AP Lumbar spine (25 cm). Compare results of either method to one of our typical charts.
If our chart suggests 60 kVp with 3.0 mAS for a 6 cm Extremity, but you discover you need 1.5 mAS, then multiply all the techniques on the extremity row by 0.5 (1.5 divided by 3.0.) - actual technique divided by typical technique.
If our chart suggests 80 kVp with 40 mAS for a 25 cm AP Lumbar Spine, but you discover you need 60 mAS, then multiply all the techniques using the table Bucky by 1.5 (60 divided by 40.) Actual technique divided by typical technique.
If our chart suggests 120 kVp with 5.0 mAS for a 25 cm PA Chest, but you discover you need 3.0 mAS, then multiply all the techniques using the vertical Bucky by 1.7 (5.0 divided by 3.0.) Actual technique divided by typical technique.
The math is that easy!
What if you prefer a different kVp? That can be customized, too. Instructions are included.
Technique Management includes:
· mA X S = mAS table
· Common film/screen situation chart
· 2 common digital imaging charts
· Dose reduction chart for digital imaging
· Reproducible/customizable pocket-sized chart
· Instructions for selecting, customizing and using these charts
Some x-ray equipment comes with default techniques programmed into the control panel. The operator must evaluate those default techniques for accuracy and minimal dose. These charts will help you do that. There are even Automatic Exposure Control (AEC) guidelines.