Gammas#

class mrinufft.trajectories.Gammas(value)[source]#

Enumerate gyromagnetic ratios for common nuclei in MR.

Methods

`conjugate`	Return self, the complex conjugate of any float.
`as_integer_ratio`	Return integer ratio.
`fromhex`	Create a floating-point number from a hexadecimal string.
`hex`	Return a hexadecimal representation of a floating-point number.
`is_integer`	Return True if the float is an integer.

Attributes

`real`	the real part of a complex number
`imag`	the imaginary part of a complex number
`HYDROGEN`
`HELIUM`
`CARBON`
`OXYGEN`
`FLUORINE`
`SODIUM`
`PHOSPHOROUS`
`XENON`
`H`
`H1`
`PROTON`
`He`
`He3`
`C`
`C13`
`O`
`O17`
`F`
`F19`
`Na`
`Na23`
`P`
`P31`
`X`
`X129`

as_integer_ratio()[source]#

Return integer ratio.

Return a pair of integers, whose ratio is exactly equal to the original float and with a positive denominator.

Raise OverflowError on infinities and a ValueError on NaNs.

>>> (10.0).as_integer_ratio()
(10, 1)
>>> (0.0).as_integer_ratio()
(0, 1)
>>> (-.25).as_integer_ratio()
(-1, 4)

Create a floating-point number from a hexadecimal string.

>>> float.fromhex('0x1.ffffp10')
2047.984375
>>> float.fromhex('-0x1p-1074')
-5e-324

Return a hexadecimal representation of a floating-point number.

>>> (-0.1).hex()
'-0x1.999999999999ap-4'
>>> 3.14159.hex()
'0x1.921f9f01b866ep+1'