RHS EXAM Questions and answers. 100% Accurate. Verified.
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RHS
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RHS
RHS EXAM Questions and answers. 100% Accurate. Verified.
Electrons - Beta particles = fast moving emmited from nucleus of radioactive atoms
Cathode rays = high speed originate in xray tube
Radiation - Form of energy carried by waves or stream of particles
Xray - Beam of energy has po...
RHS EXAM Questions and answers.
100% Accurate. Verified.
Electrons - Beta particles = fast moving emmited from nucleus of radioactive atoms
Cathode rays = high speed originate in xray tube
Radiation - Form of energy carried by waves or stream of particles
Xray - Beam of energy has power to penetrate substances and record image
Dose rate - Dose received over time , rapid delivery no time for body to repair
Radiographs - Picture or visible photographic image
Total dose - Quantity of radiation recieved or total amount of radiation energy absorbed
Who's discovered radiographs ? - William roentgen
Wavelength - Detremines penetration power of beam
Voltage - Determines speed of electron as they move from cathode to anode
Harder hit - shorter waves - high power
65-100kvp
,Kvp too high/low - High KVP= high speed of electron = high penetration power= short waves = high
intensity = high shades of grey = low contrast long scale
Low KVP = low speed of electrons= low penetration power= long waves = low intensity = low shades of
gray = high contrast/black and white short scale
Amperage - Regulates temperautee of cathode/ heat
Measures electrons moving through conductor
#of electrons= # of xrays produced
High milliamperage High electrons =more electron clouds, more xrays, increase intensity and density
decrease exposure time
Low electrons= less electron clouds = less X-rays less intensity and density increase exposure time
MAS - MilliampsXexposure time
High MAS = low exposure time
Low MAS = high exposure time
Exposure time - Quantity of xrays
INCREASE
Kilovolts - How fast electrons move from cathode to anode
INCREASE
Milliamps - More electrons created in cloud
INCREASE
,Distance - TRD greater =longer PID = less intense= less magnification
TRD lesser = shorter PID = more intense = more magnification
Increase ORD = increase magnification
Decrease ORD = less magnification
Direct hit theory - Cell damage occurs when radiation directly hits Critical areas, Dna occurs infrequently
, most photons pass through cell amd cause little or no damage
Indirect hit theory - Photons absorbed by cell, formation of toxins affect cell function occurs more
frequently
Latent period - Elapsed time date of exposure to the time you see a sign or symptom
Can be long or short
Somatic effect - Not passed on but rather in the person who was exposed
Genetic effect - Not in the person who was exposed but in future generations of that person
Radiosensitive - More affected
Marrow, reproductive, immature bone, small lymohocytes, skin of face thyroid lens of eye high mitotic/
metabolism rate
Radioresistant - Less affected
Mature bone, muscles nerves
Roentgen - Rad, rem
Measured amlunt of radition exposure in the air that has been produced
, Coloumbus - Gray, sievert
Amñint of electrical charge in the air produced by xrays
rad - Radiation absorbed dose
Amount of energy absorbed by patients tissues
1rad=0.01gray
1gray=100rad
rem - Roentgen equivalent dose
A measurement to compare biological effects of a different type of radiation
1rem = 0.01 sievert
1 sievert= 100 rem
Average radiation - 150-300 millirads ina year
Minimizing exposure - Espeed film rather than dspeed
Rectangular colimnator rather than circular
Long cone rather than short
High kvp rather than low
Filtration - Inherent and added
Inherent - Primary beam
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