hand held dental X-ray devices Flashcards

1
Q

what is absorbed dose

A

a physical qunaitiy of Energy absorbed by irraded sample of matter measured in gray

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2
Q

what is equivalent does

A

A biological effect of radiation type R with weight factor R

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3
Q

how to calculate equivalent does

A

multiple radition types requireing calculation duing radiation weighting factor then summated

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4
Q

what is the Effective dose

A

The biological effect on tissue type type T having weight factor wT

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5
Q

Calculation of effecitve dose

A

Summation of organ doses to those parts irradiated

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6
Q

what is complete (uniform) irradiation

A

If whole body is irradiated uniformly, the weighting factor becomes one and effective dose = whole body equivalent dose

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7
Q

what is used to convert equivalent dose to effective dose

A

Tissue weighting facotr

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8
Q

what is used to protect the provider in hand held X-rays

A

A shield

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9
Q

when is a handheld dexntal X-ray device useful

A

In missions

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10
Q

what is the key differneces between a handheld and normal X-ray device

A

Operator holds the handheld so the operator also needs to be protected
Handheld device need a lower output dose rate

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11
Q

what needs to be shielded from the operator

A

Backscateer radiation

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12
Q

how to stop backscater radiation

A

instal a backscatter shield at the end of the X-ray tube

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13
Q

what is the minimum for the backscatter shiled

A

.25mm lead eq
15.2 cm in dimater
no further than 1cm from the end of the PID

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14
Q

can you use a portable X ray device without a backscatter shield

A

No

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15
Q

problem with backscatter shields

A

Obstructs the arm of the RINN kit and increase the distance between xray source and patients

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16
Q

handheld X-ray exposure time

A

Long exposure time

17
Q

battery problem with handheld X-rays

A

charged daily,

decrease during successive exposures hurting image quality

18
Q

how much do handheld X-rays wiegh

A

enough to increase risk of movement and misalignment

19
Q

Ohio laws for handheld X-rays

A
  • intraoral only
  • operator needs full lead
  • apron with .25 lead eq
  • need a backscatter shield at all times if it comes with one
  • need to be stored so it is not stolen or removed without authorization
  • must train to keep body out of beam, and no bystandard 6 feet from the patient