Methods of dose reduction

Question 1

What ways can we reduce radiation dose to patients?

Answer 1

Clinical judgment
Equipment used
Radiographic technique
Lead protection

Question 2

How can we use the equipment do reduce radiation dose?

Answer 2

High kV (70)
Constant potential
Recatangular collumator
Aluminium filtration
Loong focus to skin distance
Accurate timer
Warning signals 
Safety checks every 3 yrs
Speed of film
Film holding devices
Good processor

Question 3

What speed films should we use intraorally to reduce radiation dose?

Answer 3

Speed D and E

Question 4

What speed films should we use extraorally to reduce dose?

Answer 4

Rare earth intensifying screens

Question 5

What can be used when taken DPT’s if only intersted in a particular area?

Answer 5

Field limitation

Sectional DPT

Question 6

What lead protection is avalilable?

Answer 6

Collar and apron

Question 7

How much should the controlled area be for units operating at 70kV?

Answer 7

1.0m

Question 8

How much should the controlled area be for units operating at above70kV?

Answer 8

1.5m

Question 9

How much is the ideal distance between the operator and the patient?

Answer 9

2.0m

Question 10

When should staff be provided with dosimeters?

Answer 10

When the workload exceeds 1mSv

Question 11

What type of dosimeters are available?

Answer 11

Film badges
Thermoluniscent dosimeters
Electronic personal dosimeters

Question 12

How can you reduce dose to the general public?

Answer 12

Thickness of partition walls
Siting of xray equipment
Ensure a radiation protection advisor has been appointed