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anatomical.py
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anatomical.py
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# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
# vi: set ft=python sts=4 ts=4 sw=4 et:
#
# Copyright 2021 The NiPreps Developers <nipreps@gmail.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# We support and encourage derived works from this project, please read
# about our expectations at
#
# https://www.nipreps.org/community/licensing/
#
"""
Anatomical workflow
===================
.. image :: _static/anatomical_workflow_source.svg
The anatomical workflow follows the following steps:
#. Conform (reorientations, revise data types) input data and read
associated metadata.
#. Skull-stripping (AFNI).
#. Calculate head mask -- :py:func:`headmsk_wf`.
#. Spatial Normalization to MNI (ANTs)
#. Calculate air mask above the nasial-cerebelum plane -- :py:func:`airmsk_wf`.
#. Brain tissue segmentation (FAST).
#. Extraction of IQMs -- :py:func:`compute_iqms`.
#. Individual-reports generation -- :py:func:`individual_reports`.
This workflow is orchestrated by :py:func:`anat_qc_workflow`.
For the skull-stripping, we use ``afni_wf`` from ``niworkflows.anat.skullstrip``:
.. workflow::
from niworkflows.anat.skullstrip import afni_wf
from mriqc.testing import mock_config
with mock_config():
wf = afni_wf()
"""
from mriqc import config
from mriqc.interfaces import (
ArtifactMask,
ComputeQI2,
ConformImage,
IQMFileSink,
RotationMask,
StructuralQC,
)
from mriqc.interfaces.reports import AddProvenance
from mriqc.interfaces.datalad import DataladIdentityInterface
from mriqc.messages import BUILDING_WORKFLOW
from mriqc.workflows.utils import get_fwhmx
from nipype.interfaces import ants, fsl
from nipype.interfaces import io as nio
from nipype.interfaces import utility as niu
from nipype.pipeline import engine as pe
from templateflow.api import get as get_template
def anat_qc_workflow(name="anatMRIQC"):
"""
One-subject-one-session-one-run pipeline to extract the NR-IQMs from
anatomical images
.. workflow::
import os.path as op
from mriqc.workflows.anatomical import anat_qc_workflow
from mriqc.testing import mock_config
with mock_config():
wf = anat_qc_workflow()
"""
dataset = config.workflow.inputs.get("T1w", []) + config.workflow.inputs.get(
"T2w", []
)
message = BUILDING_WORKFLOW.format(
detail=(
f"for {len(dataset)} NIfTI files." if len(dataset) > 2
else f"({' and '.join(('<%s>' % v for v in dataset))})."
),
)
config.loggers.workflow.info(message)
# Initialize workflow
workflow = pe.Workflow(name=name)
# Define workflow, inputs and outputs
# 0. Get data
inputnode = pe.Node(niu.IdentityInterface(fields=["in_file"]), name="inputnode")
inputnode.iterables = [("in_file", dataset)]
datalad_get = pe.Node(DataladIdentityInterface(
fields=["in_file"],
dataset_path=config.execution.bids_dir
), name="datalad_get")
outputnode = pe.Node(niu.IdentityInterface(fields=["out_json"]), name="outputnode")
# 1. Reorient anatomical image
to_ras = pe.Node(ConformImage(check_dtype=False), name="conform")
# 2. species specific skull-stripping
if config.workflow.species.lower() == "human":
skull_stripping = synthstrip_wf(omp_nthreads=config.nipype.omp_nthreads)
ss_bias_field = "outputnode.bias_image"
else:
from nirodents.workflows.brainextraction import init_rodent_brain_extraction_wf
skull_stripping = init_rodent_brain_extraction_wf(
template_id=config.workflow.template_id
)
ss_bias_field = "final_n4.bias_image"
# 3. Head mask
hmsk = headmsk_wf()
# 4. Spatial Normalization, using ANTs
norm = spatial_normalization()
# 5. Air mask (with and without artifacts)
amw = airmsk_wf()
# 6. Brain tissue segmentation
if config.workflow.species.lower() == "human":
segment = pe.Node(
fsl.FAST(segments=True, out_basename="segment"),
name="segmentation",
mem_gb=5,
)
seg_in_file = "in_files"
dseg_out = "tissue_class_map"
pve_out = "partial_volume_files"
else:
from niworkflows.interfaces.fixes import ApplyTransforms
tpms = [
str(tpm)
for tpm in get_template(
config.workflow.template_id, label=["CSF", "GM", "WM"], suffix="probseg"
)
]
xfm_tpms = pe.MapNode(
ApplyTransforms(
dimension=3,
default_value=0,
float=True,
interpolation="Gaussian",
output_image="prior.nii.gz",
),
iterfield=["input_image"],
name="xfm_tpms",
)
xfm_tpms.inputs.input_image = tpms
format_tpm_names = pe.Node(
niu.Function(
input_names=["in_files"],
output_names=["file_format"],
function=_format_tpm_names,
execution={"keep_inputs": True, "remove_unnecessary_outputs": False},
),
name="format_tpm_names",
)
segment = pe.Node(
ants.Atropos(
initialization="PriorProbabilityImages",
number_of_tissue_classes=3,
prior_weighting=0.1,
mrf_radius=[1, 1, 1],
mrf_smoothing_factor=0.01,
save_posteriors=True,
out_classified_image_name="segment.nii.gz",
output_posteriors_name_template="segment_%02d.nii.gz",
),
name="segmentation",
mem_gb=5,
)
seg_in_file = "intensity_images"
dseg_out = "classified_image"
pve_out = "posteriors"
# 7. Compute IQMs
iqmswf = compute_iqms()
# Reports
repwf = individual_reports()
# Connect all nodes
# fmt: off
workflow.connect([
(inputnode, datalad_get, [("in_file", "in_file")]),
(datalad_get, to_ras, [("in_file", "in_file")]),
(datalad_get, iqmswf, [("in_file", "inputnode.in_file")]),
(datalad_get, norm, [(("in_file", _get_mod), "inputnode.modality")]),
(to_ras, skull_stripping, [("out_file", "inputnode.in_files")]),
(skull_stripping, segment, [("outputnode.out_brain", seg_in_file)]),
(skull_stripping, hmsk, [("outputnode.out_corrected", "inputnode.in_file")]),
(segment, hmsk, [(dseg_out, "inputnode.in_segm")]),
(skull_stripping, norm, [
("outputnode.out_corrected", "inputnode.moving_image"),
("outputnode.out_mask", "inputnode.moving_mask")]),
(norm, amw, [
("outputnode.inverse_composite_transform", "inputnode.inverse_composite_transform")]),
(norm, iqmswf, [
("outputnode.inverse_composite_transform", "inputnode.inverse_composite_transform")]),
(norm, repwf, ([
("outputnode.out_report", "inputnode.mni_report")])),
(to_ras, amw, [("out_file", "inputnode.in_file")]),
(skull_stripping, amw, [("outputnode.out_mask", "inputnode.in_mask")]),
(hmsk, amw, [("outputnode.out_file", "inputnode.head_mask")]),
(to_ras, iqmswf, [("out_file", "inputnode.in_ras")]),
(skull_stripping, iqmswf, [("outputnode.out_corrected", "inputnode.inu_corrected"),
(ss_bias_field, "inputnode.in_inu"),
("outputnode.out_mask", "inputnode.brainmask")]),
(amw, iqmswf, [("outputnode.air_mask", "inputnode.airmask"),
("outputnode.hat_mask", "inputnode.hatmask"),
("outputnode.art_mask", "inputnode.artmask"),
("outputnode.rot_mask", "inputnode.rotmask")]),
(segment, iqmswf, [(dseg_out, "inputnode.segmentation"),
(pve_out, "inputnode.pvms")]),
(hmsk, iqmswf, [("outputnode.out_file", "inputnode.headmask")]),
(to_ras, repwf, [("out_file", "inputnode.in_ras")]),
(skull_stripping, repwf, [
("outputnode.out_corrected", "inputnode.inu_corrected"),
("outputnode.out_mask", "inputnode.brainmask")]),
(hmsk, repwf, [("outputnode.out_file", "inputnode.headmask")]),
(amw, repwf, [("outputnode.air_mask", "inputnode.airmask"),
("outputnode.art_mask", "inputnode.artmask"),
("outputnode.rot_mask", "inputnode.rotmask")]),
(segment, repwf, [(dseg_out, "inputnode.segmentation")]),
(iqmswf, repwf, [("outputnode.noisefit", "inputnode.noisefit")]),
(iqmswf, repwf, [("outputnode.out_file", "inputnode.in_iqms")]),
(iqmswf, outputnode, [("outputnode.out_file", "out_json")]),
])
if config.workflow.species.lower() == 'human':
workflow.connect([
(datalad_get, segment, [(("in_file", _get_imgtype), "img_type")]),
])
else:
workflow.connect([
(skull_stripping, xfm_tpms, [("outputnode.out_brain", "reference_image")]),
(norm, xfm_tpms, [("outputnode.inverse_composite_transform", "transforms")]),
(xfm_tpms, format_tpm_names, [('output_image', 'in_files')]),
(format_tpm_names, segment, [(('file_format', _pop), 'prior_image')]),
(skull_stripping, segment, [("outputnode.out_mask", "mask_image")]),
])
# fmt: on
# Upload metrics
if not config.execution.no_sub:
from ..interfaces.webapi import UploadIQMs
upldwf = pe.Node(UploadIQMs(), name="UploadMetrics")
upldwf.inputs.url = config.execution.webapi_url
upldwf.inputs.strict = config.execution.upload_strict
if config.execution.webapi_port:
upldwf.inputs.port = config.execution.webapi_port
# fmt: off
workflow.connect([
(iqmswf, upldwf, [("outputnode.out_file", "in_iqms")]),
(upldwf, repwf, [("api_id", "inputnode.api_id")]),
])
# fmt: on
return workflow
def spatial_normalization(name="SpatialNormalization"):
"""Create a simplied workflow to perform fast spatial normalization."""
from niworkflows.interfaces.reportlets.registration import (
SpatialNormalizationRPT as RobustMNINormalization,
)
# Have the template id handy
tpl_id = config.workflow.template_id
# Define workflow interface
workflow = pe.Workflow(name=name)
inputnode = pe.Node(
niu.IdentityInterface(fields=["moving_image", "moving_mask", "modality"]),
name="inputnode",
)
outputnode = pe.Node(
niu.IdentityInterface(fields=["inverse_composite_transform", "out_report"]),
name="outputnode",
)
# Spatial normalization
norm = pe.Node(
RobustMNINormalization(
flavor=["testing", "fast"][config.execution.debug],
num_threads=config.nipype.omp_nthreads,
float=config.execution.ants_float,
template=tpl_id,
generate_report=True,
),
name="SpatialNormalization",
# Request all MultiProc processes when ants_nthreads > n_procs
num_threads=config.nipype.omp_nthreads,
mem_gb=3,
)
if config.workflow.species.lower() == "human":
norm.inputs.reference_mask = str(
get_template(tpl_id, resolution=2, desc="brain", suffix="mask")
)
else:
norm.inputs.reference_image = str(get_template(tpl_id, suffix="T2w"))
norm.inputs.reference_mask = str(
get_template(tpl_id, desc="brain", suffix="mask")[0]
)
# fmt: off
workflow.connect([
(inputnode, norm, [("moving_image", "moving_image"),
("moving_mask", "moving_mask"),
("modality", "reference")]),
(norm, outputnode, [("inverse_composite_transform", "inverse_composite_transform"),
("out_report", "out_report")]),
])
# fmt: on
return workflow
def compute_iqms(name="ComputeIQMs"):
"""
Setup the workflow that actually computes the IQMs.
.. workflow::
from mriqc.workflows.anatomical import compute_iqms
from mriqc.testing import mock_config
with mock_config():
wf = compute_iqms()
"""
from niworkflows.interfaces.bids import ReadSidecarJSON
from ..interfaces.anatomical import Harmonize
from .utils import _tofloat
workflow = pe.Workflow(name=name)
inputnode = pe.Node(
niu.IdentityInterface(
fields=[
"in_file",
"in_ras",
"brainmask",
"airmask",
"artmask",
"headmask",
"rotmask",
"hatmask",
"segmentation",
"inu_corrected",
"in_inu",
"pvms",
"metadata",
"inverse_composite_transform",
]
),
name="inputnode",
)
outputnode = pe.Node(
niu.IdentityInterface(fields=["out_file", "noisefit"]),
name="outputnode",
)
# Extract metadata
meta = pe.Node(ReadSidecarJSON(), name="metadata")
# Add provenance
addprov = pe.Node(AddProvenance(), name="provenance", run_without_submitting=True)
# AFNI check smoothing
fwhm_interface = get_fwhmx()
fwhm = pe.Node(fwhm_interface, name="smoothness")
# Harmonize
homog = pe.Node(Harmonize(), name="harmonize")
if config.workflow.species.lower() != "human":
homog.inputs.erodemsk = False
homog.inputs.thresh = 0.8
# Mortamet's QI2
getqi2 = pe.Node(ComputeQI2(), name="ComputeQI2")
# Compute python-coded measures
measures = pe.Node(
StructuralQC(human=config.workflow.species.lower() == "human"), "measures"
)
# Project MNI segmentation to T1 space
invt = pe.MapNode(
ants.ApplyTransforms(
dimension=3, default_value=0, interpolation="Linear", float=True
),
iterfield=["input_image"],
name="MNItpms2t1",
)
if config.workflow.species.lower() == "human":
invt.inputs.input_image = [
str(p)
for p in get_template(
config.workflow.template_id,
suffix="probseg",
resolution=1,
label=["CSF", "GM", "WM"],
)
]
else:
invt.inputs.input_image = [
str(p)
for p in get_template(
config.workflow.template_id,
suffix="probseg",
label=["CSF", "GM", "WM"],
)
]
datasink = pe.Node(
IQMFileSink(
out_dir=config.execution.output_dir,
dataset=config.execution.dsname,
),
name="datasink",
run_without_submitting=True,
)
def _getwm(inlist):
return inlist[-1]
# fmt: off
workflow.connect([
(inputnode, meta, [("in_file", "in_file")]),
(inputnode, datasink, [("in_file", "in_file"),
(("in_file", _get_mod), "modality")]),
(inputnode, addprov, [(("in_file", _get_mod), "modality")]),
(meta, datasink, [("subject", "subject_id"),
("session", "session_id"),
("task", "task_id"),
("acquisition", "acq_id"),
("reconstruction", "rec_id"),
("run", "run_id"),
("out_dict", "metadata")]),
(inputnode, addprov, [("in_file", "in_file"),
("airmask", "air_msk"),
("rotmask", "rot_msk")]),
(inputnode, getqi2, [("in_ras", "in_file"),
("hatmask", "air_msk")]),
(inputnode, homog, [("inu_corrected", "in_file"),
(("pvms", _getwm), "wm_mask")]),
(inputnode, measures, [("in_inu", "in_bias"),
("in_ras", "in_file"),
("airmask", "air_msk"),
("headmask", "head_msk"),
("artmask", "artifact_msk"),
("rotmask", "rot_msk"),
("segmentation", "in_segm"),
("pvms", "in_pvms")]),
(inputnode, fwhm, [("in_ras", "in_file"),
("brainmask", "mask")]),
(inputnode, invt, [("in_ras", "reference_image"),
("inverse_composite_transform", "transforms")]),
(homog, measures, [("out_file", "in_noinu")]),
(invt, measures, [("output_image", "mni_tpms")]),
(fwhm, measures, [(("fwhm", _tofloat), "in_fwhm")]),
(measures, datasink, [("out_qc", "root")]),
(addprov, datasink, [("out_prov", "provenance")]),
(getqi2, datasink, [("qi2", "qi_2")]),
(getqi2, outputnode, [("out_file", "noisefit")]),
(datasink, outputnode, [("out_file", "out_file")]),
])
# fmt: on
return workflow
def individual_reports(name="ReportsWorkflow"):
"""
Generate the components of the individual report.
.. workflow::
from mriqc.workflows.anatomical import individual_reports
from mriqc.testing import mock_config
with mock_config():
wf = individual_reports()
"""
from ..interfaces import PlotMosaic
from ..interfaces.reports import IndividualReport
verbose = config.execution.verbose_reports
pages = 2
extra_pages = int(verbose) * 7
workflow = pe.Workflow(name=name)
inputnode = pe.Node(
niu.IdentityInterface(
fields=[
"in_ras",
"brainmask",
"headmask",
"airmask",
"artmask",
"rotmask",
"segmentation",
"inu_corrected",
"noisefit",
"in_iqms",
"mni_report",
"api_id",
]
),
name="inputnode",
)
mosaic_zoom = pe.Node(
PlotMosaic(out_file="plot_anat_mosaic1_zoomed.svg", cmap="Greys_r"),
name="PlotMosaicZoomed",
)
mosaic_noise = pe.Node(
PlotMosaic(
out_file="plot_anat_mosaic2_noise.svg",
only_noise=True,
cmap="viridis_r",
),
name="PlotMosaicNoise",
)
mplots = pe.Node(niu.Merge(pages + extra_pages), name="MergePlots")
rnode = pe.Node(IndividualReport(), name="GenerateReport")
# Link images that should be reported
dsplots = pe.Node(
nio.DataSink(
base_directory=str(config.execution.output_dir),
parameterization=False,
),
name="dsplots",
run_without_submitting=True,
)
# fmt: off
workflow.connect([
(inputnode, rnode, [("in_iqms", "in_iqms")]),
(inputnode, mosaic_zoom, [("in_ras", "in_file"),
("brainmask", "bbox_mask_file")]),
(inputnode, mosaic_noise, [("in_ras", "in_file")]),
(mosaic_zoom, mplots, [("out_file", "in1")]),
(mosaic_noise, mplots, [("out_file", "in2")]),
(mplots, rnode, [("out", "in_plots")]),
(rnode, dsplots, [("out_file", "@html_report")]),
])
# fmt: on
if not verbose:
return workflow
from ..interfaces.viz import PlotContours
plot_segm = pe.Node(
PlotContours(
display_mode="z",
levels=[0.5, 1.5, 2.5],
cut_coords=10,
colors=["r", "g", "b"],
),
name="PlotSegmentation",
)
plot_bmask = pe.Node(
PlotContours(
display_mode="z",
levels=[0.5],
colors=["r"],
cut_coords=10,
out_file="bmask",
),
name="PlotBrainmask",
)
plot_airmask = pe.Node(
PlotContours(
display_mode="x",
levels=[0.5],
colors=["r"],
cut_coords=6,
out_file="airmask",
),
name="PlotAirmask",
)
plot_headmask = pe.Node(
PlotContours(
display_mode="x",
levels=[0.5],
colors=["r"],
cut_coords=6,
out_file="headmask",
),
name="PlotHeadmask",
)
plot_artmask = pe.Node(
PlotContours(
display_mode="z",
levels=[0.5],
colors=["r"],
cut_coords=10,
out_file="artmask",
saturate=True,
),
name="PlotArtmask",
)
# fmt: off
workflow.connect([
(inputnode, plot_segm, [("in_ras", "in_file"),
("segmentation", "in_contours")]),
(inputnode, plot_bmask, [("in_ras", "in_file"),
("brainmask", "in_contours")]),
(inputnode, plot_headmask, [("in_ras", "in_file"),
("headmask", "in_contours")]),
(inputnode, plot_airmask, [("in_ras", "in_file"),
("airmask", "in_contours")]),
(inputnode, plot_artmask, [("in_ras", "in_file"),
("artmask", "in_contours")]),
(inputnode, mplots, [("mni_report", f"in{pages + 1}")]),
(plot_bmask, mplots, [("out_file", f"in{pages + 2}")]),
(plot_segm, mplots, [("out_file", f"in{pages + 3}")]),
(plot_artmask, mplots, [("out_file", f"in{pages + 4}")]),
(plot_headmask, mplots, [("out_file", f"in{pages + 5}")]),
(plot_airmask, mplots, [("out_file", f"in{pages + 6}")]),
(inputnode, mplots, [("noisefit", f"in{pages + 7}")]),
])
# fmt: on
return workflow
def headmsk_wf(name="HeadMaskWorkflow"):
"""
Computes a head mask as in [Mortamet2009]_.
.. workflow::
from mriqc.testing import mock_config
from mriqc.workflows.anatomical import headmsk_wf
with mock_config():
wf = headmsk_wf()
"""
use_bet = config.workflow.headmask.upper() == "BET"
has_dipy = False
if not use_bet:
try:
from dipy.denoise import nlmeans # noqa
has_dipy = True
except ImportError:
pass
if not use_bet and not has_dipy:
raise RuntimeError(
"DIPY is not installed and ``config.workflow.headmask`` is not BET."
)
workflow = pe.Workflow(name=name)
inputnode = pe.Node(
niu.IdentityInterface(fields=["in_file", "in_segm"]), name="inputnode"
)
outputnode = pe.Node(niu.IdentityInterface(fields=["out_file"]), name="outputnode")
if use_bet:
# Alternative for when dipy is not installed
bet = pe.Node(fsl.BET(surfaces=True), name="fsl_bet")
# fmt: off
workflow.connect([
(inputnode, bet, [("in_file", "in_file")]),
(bet, outputnode, [('outskin_mask_file', "out_file")]),
])
# fmt: on
else:
from nipype.interfaces.dipy import Denoise
enhance = pe.Node(
niu.Function(
input_names=["in_file"],
output_names=["out_file"],
function=_enhance,
),
name="Enhance",
)
estsnr = pe.Node(
niu.Function(
input_names=["in_file", "seg_file"],
output_names=["out_snr"],
function=_estimate_snr,
),
name="EstimateSNR",
)
denoise = pe.Node(Denoise(), name="Denoise")
gradient = pe.Node(
niu.Function(
input_names=["in_file", "snr", "sigma"],
output_names=["out_file"],
function=image_gradient,
),
name="Grad",
)
thresh = pe.Node(
niu.Function(
input_names=["in_file", "in_segm", "aniso", "thresh"],
output_names=["out_file"],
function=gradient_threshold,
),
name="GradientThreshold",
)
if config.workflow.species != "human":
calc_sigma = pe.Node(
niu.Function(
input_names=["in_file"],
output_names=["sigma"],
function=sigma_calc,
),
name="calc_sigma",
)
workflow.connect(
[
(inputnode, calc_sigma, [("in_file", "in_file")]),
(calc_sigma, gradient, [("sigma", "sigma")]),
]
)
thresh.inputs.aniso = True
thresh.inputs.thresh = 4.0
# fmt: off
workflow.connect([
(inputnode, estsnr, [("in_file", "in_file"),
("in_segm", "seg_file")]),
(estsnr, denoise, [("out_snr", "snr")]),
(inputnode, enhance, [("in_file", "in_file")]),
(enhance, denoise, [("out_file", "in_file")]),
(estsnr, gradient, [("out_snr", "snr")]),
(denoise, gradient, [("out_file", "in_file")]),
(inputnode, thresh, [("in_segm", "in_segm")]),
(gradient, thresh, [("out_file", "in_file")]),
(thresh, outputnode, [("out_file", "out_file")]),
])
# fmt: on
return workflow
def airmsk_wf(name="AirMaskWorkflow"):
"""
Implements the Step 1 of [Mortamet2009]_.
.. workflow::
from mriqc.testing import mock_config
from mriqc.workflows.anatomical import airmsk_wf
with mock_config():
wf = airmsk_wf()
"""
workflow = pe.Workflow(name=name)
inputnode = pe.Node(
niu.IdentityInterface(
fields=[
"in_file",
"in_mask",
"head_mask",
"inverse_composite_transform",
]
),
name="inputnode",
)
outputnode = pe.Node(
niu.IdentityInterface(fields=["hat_mask", "air_mask", "art_mask", "rot_mask"]),
name="outputnode",
)
rotmsk = pe.Node(RotationMask(), name="RotationMask")
invt = pe.Node(
ants.ApplyTransforms(
dimension=3,
default_value=0,
interpolation="MultiLabel",
float=True,
),
name="invert_xfm",
)
if config.workflow.species.lower() == "human":
invt.inputs.input_image = str(
get_template(
config.workflow.template_id, resolution=1, desc="head", suffix="mask"
)
)
else:
# TODO: provide options for other populations
invt.inputs.input_image = str(
get_template(config.workflow.template_id, desc="brain", suffix="mask")[0]
)
qi1 = pe.Node(ArtifactMask(), name="ArtifactMask")
# fmt: off
workflow.connect([
(inputnode, rotmsk, [("in_file", "in_file")]),
(inputnode, qi1, [("in_file", "in_file"),
("head_mask", "head_mask")]),
(rotmsk, qi1, [("out_file", "rot_mask")]),
(inputnode, invt, [("in_mask", "reference_image"),
("inverse_composite_transform", "transforms")]),
(invt, qi1, [("output_image", "nasion_post_mask")]),
(qi1, outputnode, [("out_hat_msk", "hat_mask"),
("out_air_msk", "air_mask"),
("out_art_msk", "art_mask")]),
(rotmsk, outputnode, [("out_file", "rot_mask")])
])
# fmt: on
return workflow
def synthstrip_wf(name="synthstrip_wf", omp_nthreads=None):
"""Create a brain-extraction workflow using SynthStrip."""
from nipype.interfaces.ants import N4BiasFieldCorrection
from niworkflows.interfaces.nibabel import IntensityClip, ApplyMask
from mriqc.interfaces.synthstrip import SynthStrip
inputnode = pe.Node(niu.IdentityInterface(fields=["in_files"]), name="inputnode")
outputnode = pe.Node(
niu.IdentityInterface(
fields=["out_corrected", "out_brain", "bias_image", "out_mask"]
),
name="outputnode",
)
# truncate target intensity for N4 correction
pre_clip = pe.Node(IntensityClip(p_min=10, p_max=99.9), name="pre_clip")
pre_n4 = pe.Node(
N4BiasFieldCorrection(
dimension=3,
num_threads=omp_nthreads,
rescale_intensities=True,
copy_header=True,
),
name="pre_n4",
)
post_n4 = pe.Node(
N4BiasFieldCorrection(
dimension=3,
save_bias=True,
num_threads=omp_nthreads,
n_iterations=[50] * 4,
copy_header=True,
),
name="post_n4",
)
synthstrip = pe.Node(
SynthStrip(),
name="synthstrip",
)
final_masked = pe.Node(ApplyMask(), name="final_masked")
final_inu = pe.Node(niu.Function(function=_apply_bias_correction), name="final_inu")
workflow = pe.Workflow(name=name)
# fmt: off
workflow.connect([
(inputnode, final_inu, [("in_files", "in_file")]),
(inputnode, pre_clip, [("in_files", "in_file")]),
(pre_clip, pre_n4, [("out_file", "input_image")]),
(pre_n4, synthstrip, [("output_image", "in_file")]),
(synthstrip, post_n4, [("out_mask", "weight_image")]),
(synthstrip, final_masked, [("out_mask", "in_mask")]),
(pre_clip, post_n4, [("out_file", "input_image")]),
(post_n4, final_inu, [("bias_image", "bias_image")]),
(post_n4, final_masked, [("output_image", "in_file")]),
(final_masked, outputnode, [("out_file", "out_brain")]),
(post_n4, outputnode, [("bias_image", "bias_image")]),
(synthstrip, outputnode, [("out_mask", "out_mask")]),
(post_n4, outputnode, [("output_image", "out_corrected")]),
])
# fmt: on
return workflow
def _apply_bias_correction(in_file, bias_image, out_file=None):
import os.path as op
import numpy as np
import nibabel as nb
img = nb.load(in_file)
data = np.clip(
img.get_fdata() * nb.load(bias_image).get_fdata(),
a_min=0,
a_max=None,
)
out_img = img.__class__(
data.astype(img.get_data_dtype()),
img.affine,
img.header,
)
if out_file is None:
fname, ext = op.splitext(op.basename(in_file))
if ext == ".gz":
fname, ext2 = op.splitext(fname)
ext = ext2 + ext
out_file = op.abspath("{}_inu{}".format(fname, ext))
out_img.to_filename(out_file)
return out_file
def _binarize(in_file, threshold=0.5, out_file=None):
import os.path as op
import nibabel as nb
import numpy as np
if out_file is None:
fname, ext = op.splitext(op.basename(in_file))
if ext == ".gz":
fname, ext2 = op.splitext(fname)
ext = ext2 + ext
out_file = op.abspath("{}_bin{}".format(fname, ext))
nii = nb.load(in_file)
data = nii.get_data()
data[data <= threshold] = 0
data[data > 0] = 1
hdr = nii.header.copy()
hdr.set_data_dtype(np.uint8)
nb.Nifti1Image(data.astype(np.uint8), nii.affine, hdr).to_filename(out_file)
return out_file
def _estimate_snr(in_file, seg_file):
import nibabel as nb
import numpy as np
from mriqc.qc.anatomical import snr
data = nb.load(in_file).get_data()
mask = nb.load(seg_file).get_data() == 2 # WM label
out_snr = snr(np.mean(data[mask]), data[mask].std(), mask.sum())
return out_snr
def _enhance(in_file, out_file=None):
import os.path as op
import nibabel as nb
import numpy as np
if out_file is None:
fname, ext = op.splitext(op.basename(in_file))
if ext == ".gz":
fname, ext2 = op.splitext(fname)
ext = ext2 + ext
out_file = op.abspath(f"{fname}_enhanced{ext}")
imnii = nb.load(in_file)
data = imnii.get_data().astype(np.float32) # pylint: disable=no-member
range_max = np.percentile(data[data > 0], 99.98)
range_min = np.median(data[data > 0])
# Resample signal excess pixels
excess = np.where(data > range_max)