Unfinished Test and Answers for Pt protection

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1.

characteristics of radiation risks

2.

(NCRP)What type of exposure switches are used?

3.

(NCRP) Fluoro tabletop intensity

4.

Shadow shields

5.

Perform these exams in PA projection when possible.

6.

Reproducibility

7.

Aperture diaphragm

8.

NCRP guidelines for manual collimation

9.

10:1 or 12:1 grid used in what type of equipment?

10.

mAs

11.

Ways to decrease patient fluoro dose cont.

12.

low ratio grids

13.

good communication

14.

Glass window in mammo is made of what?

15.

grids

16.

If the minimum response time is too high, how is this fixed.

17.

Beam restriction

18.

How often should intensifying screens be cleaned and checked? (NCRP)

19.

8:1 grid good for what kV range?

20.

Positive beam limitation-PBL

A.

leaded material casts a shadow within the illuminated field that corresponds to shielded area, inially expensive but one time expense, can be used without contacting sterile fields, NOT TO BE USED IN FLUORO.

B.

elementary -dedicated chest, dental unit, trauma imaging equipment -flat piece of lead having a central opening with a size and shape that determines the size and shape of x-ray beam

C.

consistency in exposure output during repeated exposures at a particular setting, any variation in output intensity must not exceed 5%

D.

used in mobile radiography, more positioning latitude

E.

needs fixed or will have excess density -preferable to decrease ma, but may decrease kV

F.

dead-man switch

G.

sensors located in Bucky tray or other IR holder signal the collimator to open or close accordingly to the IR size being used, will provide a small unexposed border on all sides of the finished image -required by the NCRP to be withi

H.

fewer than 10 R/min

I.

up to 90 kV

J.

Skull, chest, abdomen, scoliosis series, spine

K.

within 2% of the SID

L.

invisible, long-term, cumulative

M.

every 6 months

N.

general fixed equipment

O.

helps gain patient's trust and confidence with a thorough explanation

P.

single most important factor in keeping patient dose to a minumum, only tissues of diagnostic interest should be iradiated -reduces pt dose, reduces production of scattered radiation, improves quality of image

Q.

controls quantity, no affect on quality

R.

function to remove a large percentage of scattered radiation mostly from Compton scatter, improve radiographic contrast

S.

beryllium-low atomic number (4)

T.

-use lowest practical pulse rate -change tube angle or patient position to spread dose over larger area

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