Equations Flashcards
How do you find pixel size?
Pixel size=POV/Matrix size
What is the equation for remnant radiation in CT scanners?
Ni=N0e-ux
Ni=radiation that comes out
N0=Radiation that comes in
x=slice thickness
How do you find the voxel value?
- Measured value-Assumed value
- Divide this number between the 2 voxels present
- Continue at another angle until the 4 values add up to the measured value
How do you calculate pitch, and pitch isn SDCT?
Ptich=Couch movement each 360 degrees/beam width
(same for SDCT)
How do you find beam width in MDCT?
Beam width=Slice thickness x number of slices
How do you calculate volume imaged?
Volume imaged=Pitch x beam width x imaging time/rotation time
How do you find the CT number?
CT number=u-uw/uw (1000)
How do you find beam width in SDCT?
Beam width=slice thickness
How do you find voxel size?
Voxel size=Pixel size x slice thickness or LWH
How do you find the number of neutrons?
Atomic mass-atomic number
What is the Larmor Equation?
What is the equation to find radioactivy activity?
A(t)=amount you ended up with
A0=Initial amount
λ=Decay constant
t=Time
What is the equation to find Radioactive Half Life?
Nt = N0 e^-λt
What is the equation for radioactivy decay?
⋋ = 0.693/T1/2
OR
A(t) = ⋋ x N(t)
How do you find the Acoustic velocity (c)?
f x λ
