آنالیز ارتباطات عمل‌کردی دینامیک مربوط به شبکه‌ی حالت پیش‌فرض در بیماران آلزایمری

ملکی بالاجو, سمیه; آسمانی, داوود; سلطانیان‌زاده, حمید

doi:10.22041/ijbme.2018.89763.1370

نویسندگان

¹ دانشجوی دکتری مهندسی پزشکی، گروه مهندسی پزشکی، دانشکده‌ی مهندسی برق، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران

² استادیار، گروه مهندسی پزشکی، دانشکده‌ی مهندسی برق، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران

³ استاد، قطب علمی کنترل و پردازش هوشمند، دانشکده‌ی مهندسی برق و کامپیوتر، دانشگاه تهران، تهران - پژوهشگر ارشد، پژوهشکده‌ی علوم شناختی، مرکز تحقیقات فیزیک نظری و ریاضیات، تهران - پژوهشگر ارشد، موسسه‌ی پزشکی هنری فورد، دیترویت، میشیگان، ایالات متحده‌ی آمریکا

https://doi.org/10.22041/ijbme.2018.89763.1370

چکیده

اختلال در ارتباطات عمل‌کردی مربوط به شبکه‌ی حالت پیش‌فرض در مراحل اولیه‌ی بیماری آلزایمر گزارش شده است. به تازگی، ویژگی غیرایستانی شبکههای مغزی، با توجه به این‌که ارتباطات عمل‌کردی درون و مابین این شبکهها در طول زمان، حتی در شرایطی که مغز انسان در حالت استراحت است، تغییر میکند، مورد توجه پژوهش‌گران قرار گرفته است. بنابراین، برای مطالعه‌ی کامل تغییرات ارتباطات عمل‌کردی در بیماری آلزایمر، لازم است که تغییرات اساسی الگوی دینامیک آن‌ها نیز بررسی شود. هدف از این مطالعه، بررسی الگوهای ارتباط عمل‌کردی دینامیک درون شبکه‌ی حالت پیش‌فرض در بیماران آلزایمر نسبت به افراد سالم میباشد. در این مطالعه، روشی مبتنی بر رگرسیون منطقی تنک، برای تخمین ماتریس ارتباطات عمل‌کردی از دادههای تصویربرداری تشدید مغناطیسی عمل‌کردی در حالت استراحت ۲۴ بیمار آلزایمری و ۳۷ فرد سالم استفاده میشود. برای تجزیه و تحلیل شبکه‌ی ارتباطات عمل‌کردی دینامیک، نمره‌ی تغییرات زمانی الگوی عمل‌کردی برای هر ناحیه‌ی مغزی تعریف میشود که میتواند چگونگی تغییرات الگوی عمل‌کردی یک ناحیه‌ی مغزی در طول زمان با استفاده از ارتباطات عمل‌کردی دینامیک آن ناحیه‌ی مغزی را کمیسازی نماید. نتایج مقایسه‌ی گروهی نشان میدهد که نمره‌ی تغییرات زمانی الگوی عمل‌کردی برخی از مناطق اصلی شبکه‌ی حالت پیش‌فرض مانند قشر قدامی مغز میانی و قشر تمپورال جانبی در بیماران آلزایمری به طور قابل توجهی افزایش مییابد. هم‌چنین تجزیه و تحلیل متعارف ارتباطات عمل‌کردی استاتیک نشان می‌دهد که الگوی ارتباطات عمل‌کردی این نواحی در اثر بیماری آلزایمر مختل میشود. این یافتهها نشان میدهند که نواحی قشر قدامی مغز میانی و قشر تمپورال جانبی در بیماران آلزایمری احتمالا به سازمان‌دهی مجدد الگوی عمل‌کردی خود در راستای جبران کاهش کارایی عمل‌کردی ناشی از بیماری آلزایمر، تمایل دارند.

کلیدواژه‌ها

موضوعات

پردازش تصاویر پزشکی

عنوان مقاله [English]

Analysis of Dynamic Functional Connectivity of Default Mode Network in Alzheimer's Disease

نویسندگان [English]

Somayeh Maleki Balajoo ¹
Davoud Asemani ²
Hamid Soltanian-Zadeh ³

¹ Ph.D Student, Biomedical Engineering Department, Electrical Engineering Faculty, K. N. Toosi University of Technology, Tehran, Iran

² Assistant Professor, Biomedical Engineering Department, Electrical Engineering Faculty, K. N. Toosi University of Technology, Tehran, Iran

³ Professor, CIPCE, School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran - School of Cognitive Sciences, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran - Radiology Image Analysis Lab, Henry Ford Health System, Detroit, MI, USA

چکیده [English]

Early alterations of functional connectivity (FC) within the default mode network (DMN) have been reported in Alzheimer’s disease (AD). Recently, the resting-state brain networks have been described with non-stationary profiles since inter- and intra-FC of the brain networks changes over time, even at rest. To fully understand the FC changes that characterize AD, the underlying change of its dynamic pattern needs to be captured. The purpose of this study was to evaluate dynamic FC (dFC) patterns within the DMN in patients with AD relative to healthy aging. Here, a sparse logistic regression (SLR) model was employed to estimate the dFC networks in patients with AD (n = 24) compared with healthy control group (n = 37) using resting-state functional magnetic resonance imaging (rs-fMRI) data. To analyze the dFC network, we introduced a temporal variability-functional pattern (TV-FP) score, which shows how the functional pattern of a given region changes over time. This score is able to quantify the temporal patterns of regions involved in a dFC network. We compared TV-FP score across groups. The results indicate that the main regions of DMN, such as the anterior medial prefrontal cortex (aMPFC) and lateral temporal cortex (LTC), are associated with a significantly increased TV-FP score in the AD group when compared to the HC group. The FC pattern of these regions is impaired in AD according to a conventional static functional connectivity (sFC) analysis. These findings may suggest that aMPFC and LTC may tend to reorganize their functional pattern to compensate for the related functional deficiency due to AD.

کلیدواژه‌ها [English]

Resting-State Functional Magnetic Resonance Imaging
Dynamic Functional Connectivity
Temporal Variability of Functional Pattern
Default Mode Network
Alzheimer’s Disease

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نشریه‌ی علمی مهندسی پزشکی زیستی

آنالیز ارتباطات عمل‌کردی دینامیک مربوط به شبکه‌ی حالت پیش‌فرض در بیماران آلزایمری

مراجع

مراجع

دوره 12، شماره 2
شهریور 1397
صفحه 111-124

آنالیز ارتباطات عمل‌کردی دینامیک مربوط به شبکه‌ی حالت پیش‌فرض در بیماران آلزایمری

مراجع

مراجع

دوره 12، شماره 2شهریور 1397صفحه 111-124

دوره 12، شماره 2
شهریور 1397
صفحه 111-124