Chapter 6. Inverse Square LAW. Inverse square law. I¹ ‗(I²)² I² (I¹)². Density maintenance formula, sometimes referred to as direct proportion square law. Old mAs x New distance ² New mAs = ________________________
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Presentation Transcript
Chapter 6
Inverse Square LAW
Inverse square law
I¹ ‗(I²)² I² (I¹)²
Density maintenance formula, sometimes referred to as direct proportion square law Old mAs x New distance ² New mAs = ________________________ Old distance ² OLD MAS‗ (OLD DISTANCE)² NEW MAS (NEW DISTANCE)²
Referring to P. 6, SID effects image density, so if you need to change SID, use density maintenance formula to maintain the same image density.
Why isn’t SID in the contrast category on P. 6? Assign module worksheet problems
Image Density
Film Screen Grid Beam restriction Processor Filtration Pathology Air gap patient
Why isn’t SID found in the contrast section on P. 6 of Wallace? (As we discuss the various imaging components, always refer to P. 6 in Wallace the learn why the component is or is not included in the other categories.)