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엑스 1-1
| Question | Answer |
|---|---|
| x-ray 구성은 | generator, x-ray tube, control console |
| generator 역활 | x-ray power source |
| x-ray tube include? | glass envelope, exit window, house |
| made tungsten source of electrons in production x-ray | filament |
| what force effect to filament | therminoic emission |
| temperature of filament controled by | quality of electorn -ma |
| thant part of cathode and encase two filament that thermionic emission occurs | focusing cup |
| positive elctrode in x-ray tube | anode |
| most x-ray tube consis of -----anode? | rotating anode |
| better detail filament? | smaller |
| more current = --- electons produced | more |
| density---- | ma |
| density role | make blackening on film |
| produce more blackening- produce less blackening | radiolucent raio- opaque |
| - ma -- film exposure | more more |
| --% minimum change in density | 30% |
| ma duble makes density 00000 | double |
| low kvp ---- enegy---- penetraction ----wave lenght | low low long |
| kvp change | contrast |
| contrast role? | detail |
| low kvp ----contrast---- scale | high contrast short scale |
| high kvp 이면 필름이 ? | gray and shade |
| ---------kvp--------ma | 15% kvp 50% ma |
| contrast 올리려면 | decrease kvp15 increase ma 100 |
| color gas fat muscle bone water | gas-black fat-black muscle water soft tissue-gray bone white |
| anode heel effect 설명 | 로테이션 타케은 각도가 있어러 여러가지로 힘이 나눠진다 그대표적인걸로 catode 에는 intensity x-ray 가 가장 크고 anode 약하다 그래서 다리를 찍을려고 한다면 x-ray tube 얇은 발가라로쪽을 anode쪽으로 cathode 쪽은 ankle 을 놔야 한다 |
| anode 와 cathode 의 detatil differ | anode more detail |
| if increase ffd | smaller and clear |
| large crystal------ contrast -----detail | large contrast less detail |
| umbra ----penumbra---- | pneumbra is blurry unsharpness |
| cause of pneumbra | too short FFD or long OFD |
| Increase OFD | unage becines bugger blurrir |
| what test best for screen film contrast | wire mesh |
| distortion can be affected by | OFD FFD |
| grid purpose | improve quality of radiograph by absorbing scatter radiation |
| grid use --bad thing | increase exposure radiation |
| best grid ration in chiropractic | 12:1 |
| air cap technique? | 환자와 필름사이를 6에서 10인치를 벌려놓아서 레디에이션 도즈를 줄인다. |
| limit size of the beam to size of body part | collimation |
| best way to reduce scatter radiation on the patient | collimation |
| how many REM safe limit per year | 1 year |
| -------is type of radiation high intensity electron hits an inner shell electorn | characteristic |
| majority of useful beam | bremsstrahlung |
| primary scatter | compton |
| lwo energy x-ray that changes direction with no energy loss | classical scatter |
| contributes to film fog | classical scatter= thompson scatter |
| low enegy photon is absorbed by subject creating alatent image | photoelectric effect |
| decrease noise | high ma low kvp |
Created by:
djocker