Med Rad 2 Flashcards

(33 cards)

1
Q

How to calculate Intensity after passing through a material?

A

I(x)=(Io)e^-ux

Io=The initial intensity before passing through matter
x=Thickness of material
I=Intensity after going through material
u=How much radiation is weakened as it passes through a material

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2
Q

How to calculate Probability of PE

A

Probability of PE=density (Z^3)/E^3

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3
Q

How to calcualte Probability of compton scatter

A

Probability of compton scatter=Density/Energy

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4
Q

How to calculate KE of photoelectron

A

KE of photoelectron=Incident x-ray photon E (or planck’s constant)-BE of electron

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5
Q

How to calculate E of initial photon with PE

A

E of initial photon with PE=EBE (binding E) +EKE (photoelectron kinetic E)

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6
Q

How to calculate E of initial photon with CS

A

E of initial photon with CS=ES+EBE+EKE

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7
Q

How to calculate TMAC

A

TMAC=u/density

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8
Q

How to calculate PEMAC

A

PEMAC=t/p
CS unit=o (sigma)
PE unit=t
Density unit=p

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9
Q

How to calculate CEMAC

A

CEMAC=o/p

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10
Q

How to calculate Probability of PE when using PEMAC

A

Probability of PE when using PEMAC=t/p (z^3)/E^3)

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11
Q

How to calcultae Probability of CS when using CEMAC

A

Probability of CS when using CEMAC=o/p (p/E)

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12
Q

How to calculte u

A

u= -ln(Ix/Io)/x OR -ln(0.5)/HVL

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13
Q

How to calcuate HVL

A

HVL=I(x)/Io

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14
Q

How to calculate TVL

A

TVL=2.303/u

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15
Q

How to calculat PMT gain

A

PMT gain=g^n
g=dynode gain
n=number of dynodes

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16
Q

Flux gain

A

Flux gain= # of output light photons/ # of input x ray photons

17
Q

Brightness gain

A

Brightness gain=Flux gain x minification gain

18
Q

Minification gain

A

Minification gain=d1^2/do^2
the ratio of the input phosphor area to the output phosphor area, resulting in a brighter image due to the concentration of electrons on a smaller surface

d1=Diameter of the IP
do=Diameter of the OP

19
Q

Electronic magnification factor

A

Electronic magnification factor=IP new size/old IP size

20
Q

Patient dose factor

A

Patient dose factor=(IP old size/IP new size)^2

21
Q

Read Logarithms:

A

Logb(X)=Y
b^y=X

22
Q

Acoustic velocity

A

Acoustic velocity or c=f x λ

23
Q

Intensity

A

Intensity= 1/distance^2

24
Q

Coulomb’s law:

A

Coulomb’s law: F=K(q1q2)/d^2
k=9x10^9
q=Charge

25
Effective RMS
Effective RMS=Peak/1.414 The equivalent DC value that would produce the same heating effect in a resistive load, representing the "effective" power delivered by the AC signal
26
Series circuit equations:
Series circuit equations: RT=R1+R2+R3 IT=I1=I2=I3 VT=V1+V2+V3
27
Parallel circuit equations:
Parallel circuit equations: IT=I1+I2 VT=V1=V2 RT=1/r1+1/r2
28
Ratio of induced voltages:
VP/NP=VS/NS n=Number of turns P and S=Primary and secondary
29
Generator rating
Generator rating=KW=mA/10 or kVp X mA/1000
30
Heat U capacity
Heat U capacity=mAs x kVp
31
Magnification factor
Magnification factor=SID/SOD
32
OG Energy of a photon:
OG Energy of a photon: E=hf E=Energy in eV f=frequency in HZ h=PLanks constant (4.15x10^-15 eV*)
33
Speed of light
Speed of light: c=f(λ) c=3x10^8m/s