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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 |