Related Experiment Video
Updated: Jun 30, 2026
A Micro-CT-based Method for Characterizing Lesions and Locating Electrodes in Small Animal Brains
Published on: November 8, 2018
Feasibility of MR-Guided PET Reconstruction in Detection of Focal Cortical Dysplasia
Erik H Middlebrooks1, Chen Lin2, Robert A Pooley2
1From the Department of Radiology (E.H.M., C.L., R.A.P., V.P., Y.C., V.G., N.S.), Mayo Clinic, Jacksonville, Florida middlebrooks.erik@mayo.edu.
Abstract:
Focal cortical dysplasia (FCD) is one of the most prevalent and difficult to detect structural etiologies of epilepsy. Recent advancements in MRI technology have enhanced detectability of FCD, yet many remain undiagnosed by MRI. FDG-PET may increase detection rates when utilized alongside MRI, yet PET continues to be underutilized beyond temporal lobe epilepsy, likely due to challenges in identifying subtle cortical lesions. Hybrid PET/MR systems present an opportunity to improve image quality and lesion detection, but benefits of hybrid PET/MR in epilepsy beyond workflow advantages are not well established. This feasibility study assesses the potential of a prototype MR-guided PET reconstruction that integrates event-by-event motion correction, enhanced point spread function modeling, regularization techniques, and MR-guided reconstruction algorithm. We demonstrate enhancements in cortical definition and increased conspicuity of FCD in FDG-PET. The combined reconstruction approach provides a distinct advantage for PET/MR, thereby helping to realize the full potential of hybrid PET/MR systems.
Insights
This study introduces an improved MR-guided PET reconstruction technique to better detect focal cortical dysplasia (FCD), a common cause of epilepsy. The enhanced method improves image clarity, aiding in the diagnosis of subtle FCD lesions.
Area of Science:
- Neuroimaging
- Medical Physics
- Epileptology
Background:
- Focal cortical dysplasia (FCD) is a leading structural cause of epilepsy, often challenging to diagnose with MRI alone.
- Fluorodeoxyglucose-positron emission tomography (FDG-PET) can improve FCD detection but is underutilized due to difficulties with subtle lesions.
- Hybrid PET/MR systems offer potential for improved image quality and lesion detection in epilepsy.
Purpose of the Study:
- To assess the feasibility of a prototype MR-guided PET reconstruction for enhanced FCD detection.
- To evaluate the benefits of integrating motion correction, PSF modeling, and regularization in PET/MR for epilepsy.
Main Methods:
- Developed and tested a prototype MR-guided PET reconstruction algorithm with event-by-event motion correction.
- Incorporated enhanced point spread function (PSF) modeling and regularization techniques.
- Utilized a hybrid PET/MR system for data acquisition and reconstruction.
Main Results:
- The MR-guided reconstruction significantly enhanced cortical definition in FDG-PET images.
- Focal cortical dysplasia (FCD) lesions showed increased conspicuity with the new reconstruction method.
- Demonstrated improved lesion detection capabilities compared to standard PET/MR reconstruction.
Conclusions:
- The integrated MR-guided PET reconstruction approach offers a distinct advantage for hybrid PET/MR systems in epilepsy.
- This technique holds promise for improving the diagnostic yield of PET/MR in identifying FCD.
- Realizing the full potential of hybrid PET/MR systems requires advanced reconstruction methods for subtle lesion detection.
Related Concept Videos
01:29Positron Emission Tomography
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...
01:13Radiological Investigation III: Pulmonary Angiogram and PET Scan
Pulmonary Angiogram
A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...