Radiography | Patient as a beam emitter |
Attenuation | reduction in photons remaining in beam after passing through a given thickness of material |
Increased part thickness results in? | increased attenuation |
What is the radiographers greatest variable? | the patient |
Attenuation = | scatter + absorption |
Atomic number and density of air is | atomic #7.78, density 1.29 |
Atomic number and density of fat is? | atomic # 6.46, density 916 |
Atomic number and density of water is ? | atomic # 7.51, density 1000 |
Atomic number and density of muscle is ? | atomic # 7.64, density 1040 |
Atomic number and density of bone is ? | Atomic # 12.31, density 1650 |
Which has low tissue density and absorbs few photons? | air |
Which has tissue density similar to water? | fat |
Which has an effective atomic number slightly less than muscle? | fat |
Calcium is among the _______ atomic number of elements found in the body. | highest |
Which absorbs a lot of photons? | bone |
What is the patients relationship to image quality | subject density, subject contrast, subject detail, subject distortion |
What is subject density? | how tightly it's packed |
What is subject contrast? | different body compostions in relation to each other |
Subject detail is dependent on what? | position within the body and the body's placement in relationship to the IR |