Analysis of Some Factors Affecting Radiographic Density Flashcards
Radiographic film OD
0-4 OD (clear to black)
Factors affecting OD
mAs
kVp
OID
SID
Generator waveform
Part thickness
IR speed
Mass density
Devt time
Collimation
Grid ratio
OD can be controlled by two majot factors:
mAs and SID
Lung Mass Density
320
Fat Mass Density
910
Soft tissue, muscle mass density
1,000
Bone mass density
1,850
Air mass density
1.3
Barium mass density
3,500
Iodine mass density
4,930
Calcium mass density
1,550
Concrete mass density
2,350
Mo mass density
10 200
Pb mass density
11 350
Re mass density
12 500
Tungstate
19 300
Classifying Pathology
Radiolucent (Desctructive)
Active TB
Atrophy
Bowel obstruction
Cancer
Degenerative arthritis
Emphysema
Osteoporosis
Pneumothorax
Classifying Pathology
Radiopaque (Constructive)
Aortic aneurysm
Ascites
Atelectasis
Cirrhosis
Hypertrophy
Metastases
Pleural effusion
Pneumonia
Sclerosis
Fat Z
6.3
Soft Tissue Z
7.4
Lung Z
7.4
Bone Z
13.8
Air Z
7.6
Iodine Z
53
Barium Z
56
Concrete Z
17
Mo Z
42
W Z
74
Pb Z
82
Ultra high or-hi plus screen relative speed value
300
High or fast screen relative speed value
200
Medium, par or standard screen relative speed value
100
Detail, slow or high resolution screen relative speed value
50
Ultra-detail screen relative speed value
25
