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Intro to Rad Chp 7
Effects to Density, Contrast, Etc
Question | Answer |
---|---|
What is the controlling factor of density? | mAs |
What is the controlling factor of contrast? | kVp |
Changing these will have what effect on density? mAs, kVp, speed factors, temp of processing chemicals, chemical fog, silver | directly proportional, so increasing these will increase density & decreasing will decrease density |
Changes to these factors will have what effect on density? grid ration, thickness of body part, collimation, SID, contrast, OID and filter thickness | inversely proportional, increasing these will DECREASE density, etc |
What effect does FSS have on density? | no effect |
Fat, muscle, and air equate to _____ density than bone or contrast media. | more |
Thin patients have ____ density on an image. | more |
Changing these factors will do what to contrast? collimation, grid ration, screen speed, tube filtration, processing time/temp (2 sec/2deg), OID | directly proportional |
CHanging these factors will have what effect on contrast? kVp, processing time/temp(more than 2sec/2/deg ), and speed of film | inversely proportional |
Abdomen/chest and breast will have what effect on contrast? | decrease contrast, these location have very low contrast |
Smaller parts have higher or lower contrast? | higher |
What effect do these factors have on contrast? mAs, ma, time,FSS, SID | No effect |