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