Equations Flashcards

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1
Q

How do you find pixel size?

A

Pixel size=POV/Matrix size

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2
Q

What is the equation for remnant radiation in CT scanners?

A

Ni=N0e-ux
Ni=radiation that comes out
N0=Radiation that comes in
x=slice thickness

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3
Q

How do you find the voxel value?

A
  1. Measured value-Assumed value
  2. Divide this number between the 2 voxels present
  3. Continue at another angle until the 4 values add up to the measured value
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4
Q

How do you calculate pitch, and pitch isn SDCT?

A

Ptich=Couch movement each 360 degrees/beam width

(same for SDCT)

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5
Q

How do you find beam width in MDCT?

A

Beam width=Slice thickness x number of slices

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6
Q

How do you calculate volume imaged?

A

Volume imaged=Pitch x beam width x imaging time/rotation time

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7
Q

How do you find the CT number?

A

CT number=u-uw/uw (1000)

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8
Q

How do you find beam width in SDCT?

A

Beam width=slice thickness

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9
Q

How do you find voxel size?

A

Voxel size=Pixel size x slice thickness or LWH

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10
Q

How do you find the number of neutrons?

A

Atomic mass-atomic number

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11
Q

What is the Larmor Equation?

A
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12
Q

What is the equation to find radioactivy activity?

A

A(t)=amount you ended up with
A0=Initial amount
λ=Decay constant
t=Time

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13
Q

What is the equation to find Radioactive Half Life?

A

Nt = N0 e^-λt

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14
Q

What is the equation for radioactivy decay?

A

⋋ = 0.693/T1/2
OR
A(t) = ⋋ x N(t)

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15
Q

How do you find the Acoustic velocity (c)?

A

f x λ

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16
Q

What is 1MHz equal to in Hz?

A

1000000

17
Q

How do you find reflection fraction?

A

(Z2-Z1)/(Z2+Z1)

z=impedance