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文章2:全文Identifying and Predicting Autism Spectrum Disorder Based on Multi-Site Structural MRI With Machine Learning.pdf
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ORIGINAL RESEARCH
published: 22 February 2022
doi: 10.3389/fnhum.2021.765517
Frontiers in Human Neuroscience | www.frontiersin.org 1 February 2022 | Volume 1 5 | Article 765517
Edited by:
Miseon Shim,
Korea University, South Korea
Reviewed by:
Xun Yang,
Chongqing University, China
Weihao Zheng,
Lanzhou University, China
*Correspondence:
Chang Liu
liuchang@cdu.edu.cn
DeZhong Yao
dyao@uestc.edu.cn
†
These authors have contributed
equally to this work
Specialty section:
This article was submitted to
Brain Imaging and Stimulation,
a section of the journal
Frontiers in Human Neuroscience
Received: 27 August 2021
Accepted: 13 December 2021
Published: 22 February 2022
Citation:
Duan Y, Zhao W, Luo C, Liu X,
Jiang H, Tang Y, Liu C and Yao D
(2022) Identifying and Predicting
Autism Spectrum Disorder Based on
Multi-Site Structural MRI With
Machine Learning.
Front. Hum. Neurosci. 15:765517.
doi: 10.3389/fnhum.2021.765517
Identifying and Predicting Autism
Spectrum Disorder B ased on
Multi-Site Structural MRI With
Machine Learning
YuMei Duan
1†
, WeiDong Zhao
2†
, Cheng Luo
3†
, XiaoJu Liu
4
, Hong Jiang
5†
, YiQian Tang
2
,
Chang Liu
2,3
*
and DeZhong Yao
3
*
1
Department of Computer and Software, Chengdu Jincheng College, Chengdu, China,
2
College of Computer, Chengdu
University, Chengdu, China,
3
The Key Laboratory for Neuro Information of Ministry of Education, Center for Information in Bio
Medicine, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Life Science and
Technology, University of Electronic Science and Technology of China, Chengdu, China,
4
Department of Abdominal
Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, China,
5
Department of Neurosurgery, Rui-Jin
Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
Although emerging evidence has implicated structural/functional abnormalities of
patients with Autism Spectrum Disorder(ASD), definitive neuroimaging mar kers remain
obscured due to inconsistent or incompatible findings, especially for structural imaging.
Furthermore, brain differences defined by statistical analy sis are difficult to implement
individual prediction. The present study has employed the machine learning techniques
under the unified framework in neuroimaging to identify the neuroimaging markers of
patients with ASD and distinguish them from typically developing controls(TDC). To
enhance the interpretability of the machine learning model, the study has processed three
levels of assessments including model-level assessment, feature-level assessment, and
biology-level assessment. According to these three levels assessment, the study has
identified neuroimaging markers of ASD including the opercular part of bilateral inferior
frontal gyrus, the orbital part of right inferior frontal gyrus, right rolandic operculum,
right olfactory cortex, right gyrus rectus, right insula, left inferior parietal gyrus, bilateral
supramarginal gyrus, bilateral angular gy rus, bilateral superior temporal gyrus, bilateral
middle temporal gyrus, and left inferior temporal gyrus. In addition, negative correlations
between the communication skill score in the Autism Diagnostic Observation Schedule
(ADOS_G) and regional gray matter (GM) volume in the gyrus rectus, left middle
temporal gyrus, and inferior temporal gyrus have been detected. A significant negative
correlation has been found between the communication skill score in ADOS_G and the
orbital part of the left inferior frontal gyrus. A negative correlation between verbal skill
score and right angular gyrus and a significant negative correlation between non-verbal
communication skill and right angular gyrus have been found. These findings in the study
have suggested the GM alte ra tion of ASD and correlated with the c linica l severity of
ASD disease symptoms. The interpretable machine learning framework gives sight to
the pathophysiological mechanism of ASD but can also be extended to other diseases.
Keywords: autism spectrum disorder, structural MRI, multi-site data, machine learning, searchlight technique
Duan et al. ASD With Machine Learning
1. INTRODUCTION
Autism Spectrum Disorder, known as ASD, is a complex
neuro-developmental disorder and has been characterized by a
series of symptoms including early-onset difficulties in social
communication as well as restricted, repetitive behaviors and
interests (
Pagnozzi et al., 2018). The symptoms of ASD generally
occur within the first 3 years of life and tend to last even
one’s whole life (
Hazlett et al., 2017). ASD brings significant
impairments on an individual’s language, emotions, behavior,
self-control, learning, and memory and also is accompanied
by intellectual disability. Moreover, it is reported that patients
with ASD are far more likely to encounter premature death
than healthy controls (
Hirvikoski et al., 2015). According to
the Morbidity and Mortality Weekly Report (MMWR) Series
published by the Centers for Disease Controls and Prevention
(CDC) in the United States, the prevalence of ASD among
children has increased from 1 in 150 to 1 in 54 over 16 years (from
2000 to 2016) and the incidence rate of ASD was 4.3 times higher
in boys t han girls (Maenner et al., 2020) in 2016. For each patient
with ASD, the average lifetime social cost is approximately $3.6
million (Cakir et al., 2020).
Actually, if ASD is unable to be detected and intervened
at an earlier age, the impairments are irreversible. Therefore,
early and accurate identification and diagnosis are crucial to
improving the life quality of ASD patients and their families.
Unfortunately, it is notoriously difficult to diagnose, especially
in children, since the cause of ASD is a result of combined
factors, including genetics, the structure and function of the
brain, as well as environmental influences (
Raki
´
c et al., 2020).
Until now, there are still no effective medical treatments for ASD.
For the current practice guidelines to assess, diagnose and treat
ASD, it is recommended to use the behavioral observation of
symptomology following the Diagnostic and Statistical Manual
(Fifth Edition) (DSM-5) (American Psychiatric Association,
2013) symptom criteria and the Internat ional Classification of
Mental and Behavioral Disorders (Tenth Edition) (ICD-10)
(Organization, 1993). However, uniformity is lacking while using
these practice guidelines, so it is probably prone to misdiagnosis
(
Eslami et al., 2021). Furthermore, these guidelines cannot point
out the biological bases related to behavioral symptoms due to
unclear neuroanatomy. Finally, these limitations have resulted in
calls for more optimal diagnostic approaches for ASD.
In the last few decades, advances in non-invasive
neuroimaging techniques and analysis have provided crucial
knowledge to uncover patterns of brain structure and function
that would be symptomatic for the autism spectrum. The vast
majority of statistical methods on Structural MRI have intended
to explore the common patterns between patients with ASD
and healthy groups, but previous volumetric and morphological
analysis on structural MRI often has derived contradicted
results. For example, some research work reported decreased
volumes of the amygdala for ASD (van Rooij Daan et al., 2017)
while others did not find significant alterations (Maier et al.,
2015
). Focusing on the hippocampus volumes, some reported
its reduction, others reported its enlargement or no changes
(
Barnea-Goraly et al., 2014; Maier et al., 2015). Xiao et al.
(2014) has found that both gray and white matter (WM) has a
significant increment with ASD, and Hazlett e t al. (201 7) has
pointed out brain volume overgrowth is related to the emergence
and severity of ASD. While Palmen et al. (2005) and Jou et al.
(2011)
have noted that t here is no difference or decreased
WM volume between ASD and healthy controls, a nd Riddle
et al. (2016) conducted voxel-based morphometry analysis and
found that the total brain volume and t he left anterior superior
temporal gyrus increased for children aged 2–4 with ASD. But
these brain structural abnormalities are subtle at later ages
(Riedel et al., 2014). These inconsistent findings are most likely
due to different collecting approaches and limited sample size
with heterogeneous characteristics of subjects (Riddle et al.,
2016). Moreover, traditional statistical analysis is based on mass
univariate techniques which process a single voxel independently
and ignore the relat ionship between voxels (Bonnici et a l., 2012;
Samartsidis et al., 2016
). Furthermore, it defines the common
pattern at t he level of groups and is unable to predict t he
unknown sample at the level of individuals (Zhutovsky et al.,
2019; Hu et al., 2021).
Most recently, the rapid advance of machine learning has
made it becomes possible to explore the underlying neural
mechanisms and provide accurate predictions and convincing
explanations for ASD from various aspects (Khodatars et al.,
2020; Eslami et al., 2021). Knutson (2013) has pointed out that
machine learning can detect differences in neuroimaging data
that might not be detected with traditional univariate analysis.
In previ ous studies, typica l statistical machine learning and
deep le arning have been utilized to identify ASD from NC in
terms of structural and functional alt erations. Statistical machine
learning requires the design of handmade features (feature
extraction/feature selection) and implement the identification of
patients with ASD based on these features (feature classification).
Ecker et al. (2010) has applied SVM to investigate the whole-brain
differences of GM and WM volume on 44 subjects and obtained
significant predictive power. Additionally, it has been found that
these brain differences are related to symptom severity. Ecker
et al. (2010) and Wee et al. (2014) have extracted morphological
features based on structural images and used SVM or multi-
kernel technique to achieve satisfactory results. Furthermore,
Zheng et al. (2018) have constructed a multi-feature-based
network based on morphological features to explore the cortico-
cortical similarities of ASD. Bilgen et al. (2020) have modeled
the morphological relationship between pairs of ROIs with a
cortical networks and verified the classification performance
of different machine learning methods. Concerning female
children, Calderoni et al. (2012) have detected the abnormality
of t h e gray matter volume based on SVM-RFE (Leung et al.,
2006; ChenZhiHong et al., 2020) and found the increased cortical
volume in some brain regions involving the left superior frontal
gyrus (SFG). In addition, bilateral SFG and right temporoparietal
junction ( TPJ) resulted in the appearance of some atypical
symptoms of ASD and might be relevant to the pathophysiology
of female children in ASD. These findings are helpful to reveal
the important influence of the structural alterations and the
relationship between the brain structure and the pathophysiology
of ASD.
Frontiers in Human Neuroscience | www.frontiersin.org 2 February 2022 | Volume 15 | Article 765517
Duan et al. ASD With Machine Learning
However, the lack of a sufficiently large sample at a single
site probably leads to poor generalizability that is notably
serious for neuroimaging due to limited participants and super-
high dimensionality of data. Consequently, the investigation
of large sample data from multi-site has attracted increasing
attention. Some studies (
Spera et al., 2019; Mwiza et al.,
2020) have figured out the superiority of machine learning
for the classification of multi-site data based on fMRI or
the combining structural and MRI in the Autism Imaging
Data Exchange database (Di Martino et al., 2017). Due to
the excellent performance of deep learning in the field of
artificial intelligence on large sample data, some researchers have
begun to dete ct abnormalities of functional conne ctiv ity based
on deep learning. Deep learning has combined dimensionality
reduction and feature classification a nd implemented the end-
to-end classification model automatically, which has achieved
satisfaction per formance (
Eslami et al., 2019; Sherkatghanad
et al., 2020). Furthermore, some attempts have been done to fuse
structural and functional features with the model of deep learning
to improve t he classification performance (Raki
´
c et al., 2020).
But it cannot be denied that deep learning handles data with
the mechanism of a black box and it is so hard to identify the
abnormal brain regions and connect the classification accuracy
with t h e underlying mechanism of ASD. Furthermore, multi-
site data also has brought the issue of data heterogeneity due
to different scanning parameters and participant populations.
The direct way to address the heterogeneity issue is to apply
dimensionality reduction to transform source data into features
in the field of machine learning (
Wang et al., 2020). Furth ermore,
these studies also utilized leave-one-site-out cross-validation to
evaluate the classification performance in the expectation of
reducing the impact of heterogeneity simultaneously (Raki
´
c
et al., 2020; Eslami et al., 2021). In order to make the results
robust, Ashourvan et al. (2016) have further proposed intra-site
cross-validation a nd inter-site cross-validation and achieved 65%
accuracy with functional connections (FC) to identify ASD from
normal control.
In fact, detecting the structural/functional brain alterations
is vital to reveal the pathological mechanism of ASD. In
particular, these brain regions with obvious differences can
be recognized as the neuro-imaging biomarkers related to
the disease. Based on this kind of neuro-imaging biomarkers
(brain regions), achieving excellent classification performance
even from different multi-sites would be the most desirable
and helpful in the clinical diagnosis. Meanwhile, aiming at a
few investigations on volumetric changes based on machine
learning, this study has applied machine learning techniques
followed the unified framework to implement model-level,
feature-level, and biology-level assessment successively. First
of all, a searchlight-based classification method has been used
to detect the volumetric changes locally and some c andid a te
brain regions have been defined based on the areas of the
volumetric changes at the model-level assessment; Regarding
distinguished brain regions, this study has processed the “visual
lesion” analysis at the feature-level assessment. Stability based on
nested cross-validation and multi-site validation of each region
has been evaluated. The candidate regions with good stability
performance have been preserved and considered as candidate
biomarkers related to ASD. Finally, this study investigated
the relationship between candidate biomarkers and symptom
severity and analyzed our results with previous findings.
The main contributions of the study are discussed as follows:
(1) Previous machine learning st udies on ASD mainly focus
on the classification performance or the important features.
Furthermore, this study paid attention to the interpretability of
the machine learning model to explore abnormal brain regions
related to ASD and conducted model level and feature level
assessment to ensure the robustness and stability of the results.
(2) The correlation analysis between abnormal brain regions and
clinical severity in our study has further proved the relationship
between the volume changes of some specific brain regions
and the c linical symptom. (3) The findings in our study are
partly consistent with previous research work. The abnormal
gray matter (GM) volume in the temporal lobe, Broca and
Wernicke area probably provides the support for the social brain
hypothesis and the broken mirror theory of ASD, which is helpful
to understand the neuroanatomy of ASD.
The structure of th is study is as follows: First, in section 2,
we provide a brief introduction to the pre-processing procedure
and statistical analysis of sMRI data . In section 3, we describe
the machine learning workflow in detail. Experimental results
and discussion are provided in section 4. Finally, in section 4, we
conclude t h e study and discuss the future direction.
2. MATERIAL
2.1. Participants
All data carried in the present study c ame from the Autism
Imaging Data Exchange (ABIDE II) (http://fcon_1000.projects.
nitrc.org/indi/abide/abide_II.html). Briefly, ABIDE with ABIDE
I and ABIDE II is a public repository that provides structural MRI
and resting-state fMRI acquired on ASD and matched control
subjects for the purpose of data sharing and scienti fic research
(
Martino et al., 2013). The ABIDE II includes 1,114 data sets
from 19 independent sites which comprise 521 participants with
ASD and 593 typically developing controls (TDC) with the age
from 5 to 64. All participants in ABIDE have received approval
from the Institutional Review Board (IRB) of e ach site. In
the present study, we have selected three independent datasets
from Georgetown University (GU), Oregon Health and Science
University (OHSU), and University of California Los Angeles
(UCLA) which are collected by t he same sc anner (Siemens) and
all participants are children with the age from 7 to 15 to reduce
the variability of multi-site neuroimaging data. Since GU has the
greatest participants, machine learning methods were conducted
on GU with nested cross-validation. Furthermore, we also trained
machine learning models for GU and tested them on OHSU and
UCLA to verify their robustness. Demographics information of
participants is summarized in Table 1. The s canning parameters
of th e th ree sites are listed in Table 2.
2.2. MRI Data Pre-processing
All structural images were processed using the SPM8 package
(Welcome Trust Center for Neuroimaging, L ondon, UK,
Frontiers in Human Neuroscience | www.frontiersin.org 3 February 2022 | Volume 15 | Article 765517
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