1. EVERYTHING YOU WANTED TO KNOW BUT WERE AFRAID TO ASK!!!!
TECHNIQUE
EVERYTHING YOU WANTED TO KNOW BUT WERE AFRAID TO ASK!!!!

2. Chapter 4 Fauber-Review Density :CONTROLLING FACTORS/INFLUENCING FACTORS: pg 63m A s
kVp
Body Habitus
SID/OID
Screen
Grids
Collimation
Thickness of the part
Anode heel
Reciprocity Law
Tube filtration
Compensating filters
Film Processing
Digital Processing

3. Chapter 4 Fauber-Review CONTRAST:
Chapter 4 Fauber-Review CONTRAST: controlling/influencing factors pg 63 k V p
Grids
Collimation
OID
Anatomic part
Tube filtration
Contrast medium
Digital imaging

4. Contrast and digital imaging
kVp still important but….
Contrast can be manipulated post processing
Minimizing scatter important since DR is sensitive to scatter

5. TECHNIQUE REVIEW: SID,OID,COLLIMATION,ANATOMIC PART, ANODE HEEL, GENERATOR OUTPUT,TUBE FILTRATION , COMPENSATING FILTERS
FILM PROCESSING

6. RECIPROCITY LAW
DENSITY ON THE FILM SHOULD BE THE SAME FOR ANY COMBINATION OF mAs as long as the product of the mAs is equal!!!
WHAAAAAT????
30 mAs
300mA x .1 = 30 mAs
200 mA x .15 =30 mAs
500mA X .06 = 30 mAs
Same product

7. It makes a difference DIGITAL
EXPOSURE ERRORS OF 50% CAN BE ADJUSTED DIGITALLY
THINK ABOUT THAT!

8. LET’S MOVE ON TO BUSHONG NOW
CHAPTER 15
PG 244

9. LET’S REVIEW TABLE 15-1 – REMEMBER THIS?
WHAT IS A FALLING LOAD GENERATOR?
DIRECT SQUARE LAW?
DOES FOCAL SPOT IMPACT TECHNIQUE?
LET’S MOVE ON TO PATIENT FACTORS, PG 251

10. Exposure Technique charts
What should be on a technique chart?
Can the same chart be used for all tubes?

11. Types of charts – pg 260-265 Anatomically programmed radiography (APR)
Variable kVp, Fixed mAs-
short contrast/more pt exposure
Fixed kVp, Variable mAs
Prefered, longer contrast less patient exposure
High kVp chart
For exams using 100 kVp or higher
Automatic exposure-PATIENT POSITIONING --VERY IMPORTANT
kVp important
OD important
Collimation important
Accessary selection
Anatomically programmed radiography (APR)

12. What do we do in these cases?
Casts/splints
Body habitus
Pathology
Is it always necessary to compensate?
NOTE BOX 15-1 ON PAGE 253
Soft tissue

13. Understanding chest x-ray technical factors
Inherently, the composition of the chest is high subject contrast.
Black lungs. White bones

14. Understanding chest x-ray technical factors
Therefore to offset the short scale contrast, low mAs is used and high kVp is needed to add the long scale needed to see all anatomy

15. CHART DEVELOPMENT-pge 263 in FAUBER
Comparative anatomy
Proportional anatomy

16. Abd. 76 kVp, 20 mAs…What do we adjust for the following?
Rose Aehle
A thin but healthy person
A Football linebacker or Santa Claus
A frail, tiny,elderly person

17. IT MAKES A DIFFERENCE
mAs change of 30% or higher before a change is noted
Changes in kVp in increments of 4 will produce a change in overall density and contrast especially in the lower kVp ranges.
For every one inch of OID, SID needs to be adjusted 7 inches

18. TRUE SCENARIO 80 YR OLD WHEELCHAIR BOUND MALE
CANNOT GET OUT OF WHEELCHAIR
SHOULDER IN NEUTRAL POSITION BUT A FRACTURE IS SUSPECTED
TUBE DOES NOT EXPOSE AT 40”SID
CAN EXPOSE AT 72” SID BUT WALL BUCKY DOES NOT MOVE DOWN LOW ENOUGH TO PUT BEHIND THE PATIENT.
WHAT POSITION AND TECHNIQUE SHOULD YOU USE? REFER TO TECHNIQUE CHART FOR THE ROOM THAT WAS A HANDOUT.