mobile and theatre radiogrpahy Flashcards

1
Q

what are 6 issues that come along with busing mobile radiography

A
  • unfamiliar environment
  • radiation protection
  • SID
  • exposure
  • use of grids
  • assistance with patient
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2
Q

what are 2 types of mobile units

A

philips and siemans

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3
Q

what frequency do mobile units function at compared to room units

A

36kw competed to room which has 65 kw

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4
Q

what is the kVp and mAs range a mobile unit has

A

10-110 kVp

0.2-360 mAs

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5
Q

why would a mobile unit need to connect to wifi

A

to network patient data and images

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6
Q

what is the size and type of anode found in a mobile unit

A

rotating anode 0.7/0.8mm

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7
Q

why do the wheels of a mobile one have anti-static rubber

A

for electrical safety

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8
Q

what helps the mobile xray from toppling due to its tubes

A

counter balance/weight

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9
Q

how long is the tube support extension in mobile xray

A

1.25m

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10
Q

how long is the tube supports focal spot height

A

2.13m

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11
Q

how does a mobile xray measure dosage

A

DAP meter

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12
Q

what is the adv and dis of having to plug the mobile xray into mains

A

adv:
- no additional or specialist plug required
- can examine multiple patients from one charge

dis:
- plugging in increases trip hazard

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13
Q

why is it important to keep mobile xray plugged even when not in use

A

batteries will run down

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14
Q

how is a battery operated mobile unit able to make exposure of 70kV

A
  • uses 2 different sets of batteries (lead-acid or nickel-cadmium)
  • one powers driving of machine
  • other 20kw provides power to xray tube
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15
Q

roughly how many images can a fully charged mobile unit take

A

10-15

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16
Q

what is the minimum distance a radiographer must stand away from patient in mobile imaging

A

2m

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17
Q

during a mobile AP chest XR the radiographer must stand 90 degrees to primary beam and object

18
Q

what are 2 safety measures during mobile imaging

A
  • inform all in near area to evacuate to avoid exposure
  • or provide lead protection to those who cannot leave the area
19
Q

what are 2 types of patients in isolation rooms

A
  1. patients who have infectious microorganisms that can spread
  2. patients who need protection from lethal microorganisms than can be carried by others
20
Q

what is the general protocol taken when examining someone in a self isolating room

A
  • announce presence to staff and ask for assistance if needed
  • determine correct patient is in room
  • introduce urself to patient and or family in room and explain procedure
  • observe medical equipment in room and move as needed
  • ask family/ visitors to leave
21
Q

what equipment is used in theatre for dynamic imaging

22
Q

what are adv of using c-arm

A

high resolution

xray images in real time

allows surgeon to monitor progress during operation

23
Q

what does c-arm use to form images

A

fluroscopy

24
Q

what type of table is needed in an operating theatre room

A

a cantilevered table thats adaptable

25
why is the cart required in an operating theatre
holds 2 monitions 1 for live dynamic images and 1 for static images holds keyboard for patient data holds touch screen monitors to change orientation or select functions
26
why is it helpful to place the cart in a position where the surgeon and radiologist can both see
it doesnt require a scrub nurse to come help
27
how is a c-arm wheeled
using a level that makes ti go forwards backwards and sidewards
28
how are you able to find the patient id on the cart
download worklist via wifi or cable and select patient from list
29
when will AEC NOT be used (aec is typically always there)
if theres high or low density artefact affecting automatic exposure
30
what type of exposure will you give extremities such as chest during c-arm
use the presets on system
31
why must the kV in c-arms be manually controlled
to compensate for the metal in the middle of the image
32
what shape collimation is in c-arm
circular (may be additional straight shutters)
33
what material filter is used in c-arm
aluminium
34
how do we insure the sterility of the c-arm during an operation
- discuss in advanced what parts of c-arm need to be draped - touch only inside of plastic drape/ shower cap - cover the lower part if theres lots of body fluid
35
define pulsed fluroscopy
delivers short pulses of XR beams at adjustable rate of pulses per second
36
define continuous fluroscopy
you hold your thumb on exposure button only for as long as it takes to see an image last image made is held on the monitor as the final image
37
between pulsed and continuous fluroscopy, which has better dose reduction
continuous
38
what is the process of image formation in a c-arm
xrays hit the image intensifier within the image intensifier, - xrays hit CSI crystals which convert it into photons - photons then hit photoelectrodes and releases electrons - electrons are accelerated by voltage of 25kv - focussed by electrodes on the sides - electrons strike output phospor which releases light - light is picked up by CCD - CCD turns light into digital image
39
how does a c-arm with a flat detector (dr technology) differ from a normal one?
the flat panel is a digital development of image intensifier intensity of incoming xrays are directly converted to digital value
40
what are the dis and adv of c-arm with image intensifier comapred to flat detecotr
with flat detector: adv : dispensing electron optics allows for distortion free image so better image quality dis: more expensive
41
what checklist is used as part of surgical safety
WHO checklist
42