RandomMotionImageHandler

class snake.core.handlers.motion.image.RandomMotionImageHandler(*, ts_std_mms=None, rs_std_degs=None, motion_file=None, motion_file_tr_ms=None)

Bases: AbstractHandler

Add Random Motion in Image.

Parameters:

• ts_std_mm – Translation standard deviation, in mm/s.

• rs_std_mm – Rotation standard deviation, in radians/s.

• motion_file (str) – If provided, the motion file is loaded and resampled to match the number of frames in the simulation. The motion is then added to the data.

• motion_file_tr (float) – Original TR of the motion file, in seconds.

• ts_std_mms (tuple[float, float, float] | None)

• rs_std_degs (tuple[float, float, float] | None)

• motion_file_tr_ms (float | None)

Notes

The motion is generated by drawing from a normal distribution with standard deviation for the 6 motion parameters (3 translations and 3 rotations, in this order). Then the cumulative motion is computed by summing the motion at each frame.

The handlers is parametrized with speed in mm/s and rad/s, as these values provides an independent control of the motion amplitude regardless of the time resolution for the simulation.

Methods

__init__
get_dynamic	Get dynamic information.
get_dynamic_kspace	Get the dynamic kspace information of the handler.
get_static	Get the static information of the handler.
to_yaml	Show the yaml config associated with the handler.

Attributes

log	Get a logger.
motion_file
motion_file_tr_ms
rs_std_degs
ts_std_mms

get_dynamic(phantom, sim_conf)

Get dynamic information.

Parameters:

• phantom (Phantom)

• sim_conf (SimConfig)

Return type:

DynamicData

property log: Logger

Get a logger.