Physics Flashcards by Holly c

does mAs have an affect on receptor exposure

yes, direct

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does kVp have an affect on receptor exposure

yes, direct

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does FSS have an affect on receptor exposure

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does SID have an affect on receptor expsoure

yes, indirect

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does OID have an affect on receptor exposure

yes, indirect (increase OID, decreases receptor exposure)

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does CR angle have an affect on receptor expsoure

yes, indirect (increase angle, decreases receptor exposure)

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does grid use have an affect on receptor exposure

yes, indirect (add grid, decrease receptor exposure)

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does collimation have an affect on receptor expsoure

yes, indirect

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does tube filtration have an affect on receptor exposure

yes, indirect

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does patient thickness have an affect on receptor exposure

yes, indirect

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does patient motion have an affect on receptor exposure

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does mAs have an affect on contrast

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does kVp have an affect on contrast

yes, indirect

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does FSS have an affect on contrast

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does SID have an affect on contrast

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does OID have an affect on contrast

yes, direct (increase OID, increase contrast)

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does CR angle have an affect on contrast

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does grid use have an affect on contrast

yes, direct

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does collimation have an affect on contrast

yes, direct

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does tube filtration have an affect on contrast

yes, indirect

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does patient thickness have an affect on contrast

yes, indirect

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does mAs have an affect on spatial resolution

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does kVp have an affect on spatial resolution

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does FSS have an affect on spatial resolution

yes, indirect

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does SID have an affect on spatial resolution

yes, direct

does OID have an affect on spatial resolution

yes, indirect (increase OID, decreases spatial resolution)

does CR angle have an affect on spatial resolution

yes, indirect (increase angle, decreases spatial resolution)

does grid use have an affect on spatial resolution

does collimation have an affect on spatial resolution

does tube filtration have an affect on spatial resolution

does patient thickness have an affect on spatial resolution

yes, indirect

does patient motion have an affect on spatial resolution

yes, indirect

what factors affect receptor expsoure

-mAs - kVp - SID - OID - CR angle - grid use - collimation - tube filtration - patient thickness

what factors affect contrast

- kVp - OID - grid use - collimation - tube filtration - patient thickness

what factors affect spatial resolution

- FSS - SID - OID - CR angle - patient thickness - patient motion

what is the grid ratio equation

height/width of interspace

equation for maintenance/direct law

mAs1/mAs2 = (d1/d2)^2

equation for inverse square law

I1/I2 = (d2/d1)^2d

the primary portion of the step up transformer is in what circuit

primary/low-voltage circuit

the secondary portion of the step up transformer is in what circuit

secondary/high-voltage circuit

the autotransformer is in what circuit

primary/low-voltage circuit

the step down transformer is in what circuit

filament circuit

the rheostat is located in what circuit

filament circuit

the x-ray tube is located in what circuit

secondary/high-voltage circuit

the filaments are located in what circuit

filament circuit

the milliampere meter is located in what circuit

secondary/high-voltage circuit

the rectifier bank is located in what circuit

secondary/high-voltage circuit

the timer circuit is located in what circuit

primary/low-voltage circuit

variable resistor

rheostat

who invented x-ray

Wilhelm Roentgen

when was x-ray invented

November 8, 1895

first casualty to radiation

clarence dally

speed of light

3x10^8 m/s ; 186,000 miles/sec

unit of absorbed dose

gray (Gy)

used to measure occupational dose; dose equivalent

sievert (Sv)

output of the radiographic unit's radiation measurement in air

coulomb/kg

measures radioactive marerial

becqueral (Bq)

largest natural source of radiation

radon

what is the relationship between energy and frequency

direct

what is the relationship between energy and wavelength

inverse

what is the relationship between frequency and wavelength

inverse

loss of energy as it goes through matter

attenuation

blurring of the edges

punumbra

how much leakage is the housing allowed

1 mGy/hr at 1 meter

what are the filaments made of

thoriated tungsten

melting point of tungsten

3410 degrees C; 6152 degrees F

boiling off of electrons

thermionic emission

can't boil off/produce anymore electrons

saturation current

what is the focusing cup made up of

nickel - negatively charged

what is the housing of the x-ray tube made of

lead

what is the target of the anode made of

tungsten with rhenium

atomic number of tungsten

what are the neck and base of the anode made of

molybdenum

how does the anode rotate by

induction motor

as you decrease the angle of the anode what happens to the anode heel affect

increases

correction factor of single phase generator

1.0

correction factor of three-phase 6 pulse generator

1.35

correction factor of three-phase 12 pulse generator

1.41

correction factor of high frequency generator

1.45

what letter represents atomic mass number

what letter represents atomic number

what is the last shell called

valence shell

electron binding energy of the k shell of tungsten

69.5 keV

electron from filament stream knocks out the k-shell electron causing a cascade

characteristic radiation

filament electron gets attracted to the nucleus and breaks/slows and changes direction

brehms

the reason we filter is due to what

brehms

happens under 69.5 kVp

brehms

max electrons the last shell can have

formula to find number of electrons in a shell

2n^2

what is frequency measured in

hertz

what is wavelength measured in

meters

what is planks constant

4.135x10^-15 eV sec; 6.626x10^-34 J sec

height of wave

amplitude

how many pulses is 60 cycles

120

what does 1 hz equal

1 cycle per second

formula for velocity

v=f x wavelength

x-rays are considered what two things

non-threshold and linear

what is alpha particle made of

2 protons and 2 neutrons

what are beta particles

electron ejected from the nucleus

if the beta that is emitted has a positive charge is is called what

positron

what does 1 coulomb equal

6.25x10^18 electrons

ohms law

V=IR

what is resistance measure in

ohms

what is current measured in

amps

what is electric potential measured in

volts

what type of current is in the vacuum tube

direct current

how do you find resistance in a series circuit

add them all up

how do you find resistance in a parallel circuit

1/RT=1/R1+1/R2+1/R3 (lowest is almost half of total)

turns AC into DC

rectifier

device that changes voltage and current

transformer

conductor fashioned into a coil

solenoid

when you add an iron core into the solenoid it creates what

electromagnet

Physics Flashcards

(112 cards)