5.1 Mobile Radiography Notes

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12 Terms

1

mAs range for mobile radiography machine

0.04-320 mAs

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2

kVp range for mobile radiography machine

40 to 130 kVp

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3

Total power for mobile machines are

15-25 kW

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4

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

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5

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

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6

The anode heel effect is more pronounced in

  • short SID

  • larger field sizes

  • small anode angles

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7

Short SID and large field sizes are

common in mobile

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8

Longer SID requires increased mAs, which results in

longer exposure time

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9

Mobile radiography produces some the

highest occupational radiation exposure for radiographers

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10

Distance is the

most effective means of radiation protection

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11

Minimum source to skin distance (SSD) is

12 inches (30 cm)

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12

2 types of patients in isolation

  • those who have contagious infectious microorganisms

  • those who must be protected from exposure to infectious microorganisms

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