Predicting BOLD signal changes as a function of blood volume fraction and resolution
نویسندگان
چکیده
منابع مشابه
Modeling the Effect of Changes in Arterial Blood Volume on the BOLD Signal
Purpose: The BOLD effect is modeled as primarily due to a mismatch of cerebral blood flow (CBF) and cerebral metabolic rate of O2 (CMRO2), but it is still not clear how we should include the effects of changes in cerebral blood volume (CBV) in the model. Having an accurate model is important because it serves as the framework for interpreting combined CBF and BOLD measurements in the calibrated...
متن کاملEffect of Phase-Encoding Reduction on Geometric Distortion and BOLD Signal Changes in fMRI
Introduction Echo-planar imaging (EPI) is a group of fast data acquisition methods commonly used in fMRI studies. It acquires multiple image lines in k-space after a single excitation, which leads to a very short scan time. A well-known problem with EPI is that it is more sensitive to distortions due to the used encoding scheme. Source of distortion is inhomogeneity in the static B0 field that ...
متن کاملA theoretical framework for estimating cerebral oxygen metabolism changes using the calibrated-BOLD method: Modeling the effects of blood volume distribution, hematocrit, oxygen extraction fraction, and tissue signal properties on the BOLD signal
Calibrated blood oxygenation level dependent (BOLD) imaging, a technique used to measure changes in cerebral O(2) metabolism, depends on an accurate model of how the BOLD signal is affected by the mismatch between changes in cerebral blood flow (CBF) and cerebral metabolic rate of O(2) (CMRO(2)). However, other factors such as the cerebral blood volume (CBV) distribution at rest and with activa...
متن کاملThe roles of changes in deoxyhemoglobin concentration and regional cerebral blood volume in the fMRI BOLD signal.
To study the behavior of cerebral physiological parameters and to further the understanding of the functional magnetic resonance imaging (fMRI) blood-oxygen-level-dependent (BOLD) effect, multisource frequency-domain near-infrared and BOLD fMRI signals were recorded simultaneously during motor functional activation in humans. From the near-infrared data information was obtained on the changes i...
متن کاملQoE as a Function of Frame Rate and Resolution Changes
Video bit rate reduction can be very important for all video streaming application. One of the possible ways to reduce bit rate is decreasing change in time or space domain i.e. changing frame rate or resolution. In this paper we present two no reference metrics mapping frame rate or resolution into MOS. Both models use simple to calculate parameters expressed by sequence spatial and temporal i...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: NMR in Biomedicine
سال: 2001
ISSN: 0952-3480,1099-1492
DOI: 10.1002/nbm.727