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mAs range for mobile radiography machine
0.04-320 mAs
kVp range for mobile radiography machine
40 to 130 kVp
Total power for mobile machines are
15-25 kW
3 important factors must be clearly understood to
The Grid
Anode Heel Effect
Source - to - image receptor distance (SID)
exposure technique charts are also essential to optimum examinations
Grid
optimum performance requires grid to be
level- use of grid on unstable surface may cause absorption of primary beam= “off-level” grid cut off
centered to CR- midline of grid more than 1 to 1 ½ inches off transversely from the CR causes “off-level” grid cutoff
used at recommended focal distance , or radius - exposures outside of the recommended focal range may produce cut-off on the lateral margins
The anode heel effect is more pronounced in
short SID
larger field sizes
small anode angles
Short SID and large field sizes are
common in mobile
Longer SID requires increased mAs, which results in
longer exposure time
Mobile radiography produces some the
highest occupational radiation exposure for radiographers
Distance is the
most effective means of radiation protection
Minimum source to skin distance (SSD) is
12 inches (30 cm)
2 types of patients in isolation
those who have contagious infectious microorganisms
those who must be protected from exposure to infectious microorganisms