Lesson 1 - Basic Nomenclature

Question 1

Define FS/T/S

Answer 1

Focal Spot/Target/Source. All mean the same thing - where x-ray beam is coming from

Question 2

Define SID and older terms: AFD, TFD, FFD, SFD

Answer 2

Source to Image Distance. 
AFD: anode to film distance
TFD: target to film distance
FFD: focal film distance 
SFD: source to film distance

Question 3

Define: SOD, AOD, FOD, TOD. Which are most common

Answer 3

SOD: source to object distance
AOD: anode to object distance
FOD: focal to object distance
TOD: target to object distance

SOD and TOD are most common

Question 4

Define OID and OFD

Answer 4

OID: object to image receptor distance
OFD: Object to film distance

Question 5

Differentiate between primary radiation, remnant radiation and scattered radiation

Answer 5

Primary radiation (PR) is all the radiation between the source and the patient. (incident radiation or useful beam)  
Remnant radiation (RR): unabsorbed primary radiation - radiation that hits the IR
Scattered radiation (SR): primary radiation which has been deflected or changed direction.

Question 6

3 things can happen when an x-ray leaves source:

Answer 6

absorbed, scattered, penetrated through to IR

some absorption or attenuation has to occur. If none then NO image