stones, they can be liable even though gall
stones should not normally show up on
a chest image. This law (like most laws)
has not changed at all from film/screen to
digital. To use post collimation properly,
some pure black or white inside of the
post collimated field must be shown to
prove that any anatomy has not been cut
off, whether it’s pertinent or not.
Directors, managers, and supervisors are
such an essential and vital part of every
imaging department as they have the
responsibility to make critical changes.
For myriad reasons, students and radiographers have varying degrees of education about digital radiography. Some still
believe that they should use the same low
kV and high mAs techniques and image
critique methods that were correct for
film screen. The EI numbers need to
be stressed as the key to understanding
if the proper technique/dose was used.
Without them, it is easy to overexpose a
patient. Using universal digital technique
charts similar to the ones found here
can aid in eliminating these challenges.
Finally, the use of post collimation by the
radiographer is not recommended.
1Burns B. “Digital Radiography: Exposure Factor Selection.” Presented at: Association of
Collegiate Educators in Radiologic Technology (ACERT) 33rd Annual Conference.
February 2008; Las Vegas, NV.
2Burns B. “Optimizing Image Acquisition.”
Presented at: Association of Collegiate
Educators in Radiologic Technology
(ACERT) 33rd Annual Conference. February 2008; Las Vegas, NV.
Dennis Bowman works as a practicing radiographer
at Community Hospital of the Monterey Peninsula
(CHOMP) where he was also the clinical instructor
for the Cabrillo College radiography students for
over 20 years. He has been a public speaker on
digital radiography since 2006. Dennis may be
contacted at email@example.com or by visiting