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Physics 2-Tomography
Question | Answer |
---|---|
What are 3 ways to separate superimposed images, and list ex of each? | 1. Distortion, Obl Spine 2. Decreased SID, Sternum 3. Motion of the Part, chewing view odontoid process |
- the radiographic demonstration of one chosen layer of an object by intentionally blurring the images above and below the pt of interest. | tomography ( goes with drawing in essay) |
- the procedure | tomography |
- the device or equipment | tomograph |
- set of films obtained from a tomographic study | tomograms |
What is the basic principle of tomography? | Motion |
- a slab btwn two planes of maximum permissible unsharpness | tomographic section |
What are the two factors affecting the thickness of a tomographic section? | tomographic angle, SID |
The larger the angle, the _______ the section. | thinner |
The ______ the angle, the thinner the section. | Larger |
- the actual distance the tube travels during the exposure | amplitude |
The shorter the amplitude the _____ the section. | thicker |
Section thickness ______ ( becomes ____ ) as the SID decreases. | decreases ( thinner) |
The more uniform the blurring, the _____ the quality of the tomogram | better |
- the blurred images of points outside the tomographic section | redundant shadows |
What two factors does the quality of tomographic images depend on? | 1. sharpness and contrast of the image of the section 2. uniform blurring of the redundant shawdows |
Maximum blurring occurs when the tube movement is ________ to the predominant lines of the structure being tomogramed. | perpendicular |
What is the simplest and most commonly used tomographic motion? | rectilinear |
Which linkage problem causes the least amt of impairment? Most? | X-ray Tube / fulcrum |
Which will produce a higher pt dose, tomography or conventional? | tomography |
What will happen if the section thickness are set too small? | over expose the pt from having to take many cuts |
What will happen if the section thickness are set too large? | might miss the pathology |