radiology

Question 1

4 ways to increase sharpness

Answer 1

decrease focal spot size
increase target-teeth distance
decrease teeth-film distance
little patient movement

Question 2

2 ways to decrease magnifiation

Answer 2

increase target-teeth distance

decrease teeth-film distance

Question 3

how should film be angled to tooth

Answer 3

parallel to long axis of tooth

Question 4

what angle should beam be to tooth

Answer 4

90degrees

Question 5

bisected angle technqiue

Answer 5

film placed as close to tooth
angle mentally bisected
beam pointed at 90 degrees to this angle

Question 6

2 methods for PA

Answer 6

paralleling

bisected angle

Question 7

how would high Kv effect image

Answer 7

darker

Question 8

what is kv a measurement of

Answer 8

penetrating power of beam

Question 9

standard Kv

Answer 9

70

Question 10

disadvantage of lower kv

Answer 10

adds skin dose

but image would be better contrast

Question 11

how is scatter minimised

Answer 11

collimators

Question 12

what is the controlled area

Answer 12

1.5m

Question 13

what is the focal trough

Answer 13

position where image is sharp in DPT

Question 14

what is Sv

Answer 14

biological damage caused by xrays

Question 15

how is head positioned for smiley DPT

Answer 15

head down

Question 16

if front teeth blurred + wide what has gone wrong in DPT

Answer 16

pt too far back

Question 17

where will ghost image (i.e. earring) appear on film

Answer 17

opposite side

Question 18

at what age would you first take DPT

Answer 18

6years

Question 19

difference between IRR and IRMER

Answer 19

IRR protects staff

IRMER protects pt

Question 20

3 main areas of IRMER regulation

Answer 20

justification
optimisation
limitation

Question 21

who is IRMER referrer

Answer 21

individual who refers pt for radiation i.e. dentist

Question 22

who is IR(ME)R practitioner

Answer 22

individual responsible for justifying radiation e.g. dentist

Question 23

who is IRMER operator

Answer 23

any person who carries out radiograph

Question 24

how to optimise radiation

Answer 24

as low as reasonably possible = fastest speed

Question 25

how to limit radiation

Answer 25

no exposure to excess predetermined limit

Question 26

job of radiation protection supervisor

Answer 26

1 RPS to 20-30members of staff

ensure staff follow local rules

Question 27

what has happened in image too dark

Answer 27

over exposed or over processed