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RD1034 Scientific Principles of Medical Imaging > mobile x-ray units > Flashcards

mobile x-ray units Flashcards

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USMLE® Step 1 flashcards
1
Q

where do we use mobile radiography?

A
  • A&E
  • ITU (intensive therapy unit)
  • CCU (coronary care unit)
  • SCBU/NNU (special baby care unit/ neonatal)
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2
Q

what are the limitations of imaging patients outside main x-ray dept?

A
  • equipment may differ
  • wheeled base machine
  • patient condition - may not be able to cooperate
  • cramped examination areas
  • need for consistent + optimum performance of equipment
  • safety for staff and patients
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3
Q

how long does exposure handswitch cable have to be in hospital ward

A

2 metres long or have infrared remote control

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4
Q

what is the power supply of mobile x ray units

A
  • mains dependent - HIGH freq
  • only some battery operated
  • dual powered
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5
Q

name some characteristics of high frequency mobile units

A
  • short exposure times
  • near constant potential output
  • light + relatively inexpensive unit
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6
Q

what do capacitors do?

A

a device for storing electrical charge

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7
Q

what are the capacitors supplying

A

supply constant DC to freq converter (inverter)

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8
Q

cordless battery operated unit

A
  • dont need to plug into mains for exposure
  • lead acid batteries supply power to x-ray tube
  • batteries supply DC
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9
Q

how long does battery last in cordless battery operated unit

A

18 months

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10
Q

what is cordless battery operated unit suitable for

A

chest radiography or paed intensive care unit

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11
Q

what is output of cordless battery operated unit

A

20/30/40/50kW

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12
Q

what is a dual powered hybrid

A
  • mains to charge batteries
  • battery/ mains for exposure
  • exposure can be made if batteries not FULLY charged
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13
Q

what is a exposure factor selection

A
  • touch screen digital console
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14
Q

AED

A

automatic exposure device

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15
Q

APR

A

anatomical programmed radiography

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16
Q

siemens exposure point system

A

changing exposure without having to manipulate numbers

17
Q

remote control exposure switch

A
  • exposures from any angle to up to 10m
  • radiation protection
  • long battery life
  • can locate transmitter unit out of cradle
18
Q

what are some technical features of mobile units

A
  • electrically earthed to prevent electrocution
  • tubes similar to x ray rooms + equip
  • Dual focal spot size of 0.8mm2 and 1.3mm2
19
Q

physical features - wheel base plate

A
  • wide and heavy for stability
  • wheels fitted with antistatic rubber tyres for safety
20
Q

vertical column and cross arm design (RADBH)

A

R - rotation around centre of column
A - extension tube head away from centre of column
D - rotation around axis of cross arm
B - angulation across long axis of tube head
H - vertical movement up and down main column

21
Q

4 digital imaging features

A
  • instantaneous viewing
  • remote from department
  • image manipulation
  • improved image detail
22
Q

maintanence

A
  • serviced regularly
  • charged in well ventilated atmosphere
  • kept clean to prevent cross contamination
23
Q

safety

A
  • tube head parked properly during transport
  • brakes should be applied when stationary or using lift
  • security key unusable - only authorised personnel (IRMER 2017)
24
Q

when in use

A
  • brakes on in correct position
  • manual present
  • tube head locked for exposure
  • check for loose cables
  • report any malfunction
  • do not use sign when necessary
25
Q

give an example of a high frequency mobile unit

A

siemens MULTIMOBIL

26
Q

how do high frequency units work?

A

fully rectify AC current and supply x-ray generator with DC current for a constant stream of radiation at high frequency up to 100kHz

27
Q

what do high frequency mobile units use to supply constant DC

A

capacitors

28
Q

what type of current supply is needed for x-rays

A

AC supply (4.5kHz) for a constant unidirectional flow of electrons

29
Q

example of cordless battery operated unit

A

philips practix convenio

RD1034 Scientific Principles of Medical Imaging (7 decks)

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