1. Calculator and note paper okay
Shoulder: 5, 5, 55 or bony thorax?
Over 15 cm bony thorax, under 15 cm either way
Breathing technique? Just use lowest mA
AC joints? For unilateral 40” okay. For bilateral use 72” and
direct square law.
Use 50% on obliques and call it a day? Fine
Grid for bony thorax? Yes
Processor? Is being worked on. Rich will give you progress reports
Penalties for wrong technique selection: If you know the concepts
penalties will be minor.

2. 30 cm RAO sternum
= mAs
80 50 mAs = 25 2 seconds
722 x 50 / 402 = 162 mAs = 25 6 seconds
That’s 150 mAs, 12 short of 162. Not a big deal
but we could kick the kVp up a couple and call
It a day.
This solution flies in the face of an old sternum
method that probably isn’t even in your text.
Or is it?
Reduce kVp
by 15%
Increase SID
to 72”……………..

3. mA Stations
Seconds