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PET and MRI Guided Irradiation of a Glioblastoma Rat Model Using a Micro-irradiator

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An MR image-guided, voxel-based partial volume correction method for PET images.

Hesheng Wang¹, Baowei Fei

¹Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30329, USA.

Medical Physics

|January 10, 2012

Summary

This study presents a new partial volume correction method for positron emission tomography (PET) imaging. The technique effectively improves radiopharmaceutical uptake quantification in PET scans, offering comparable results to existing methods without requiring segmentation.

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Whole-body PET/MRI of Pediatric Patients: The Details That Matter

Whole-body PET/MRI of Pediatric Patients: The Details That Matter

Published on: December 19, 2017

Area of Science:

Medical Imaging
Nuclear Medicine
Image Processing

Background:

Partial volume effect in PET leads to inaccurate quantification of radiopharmaceutical uptake.
Accurate quantification is crucial for functional imaging analysis.

Purpose of the Study:

To develop and evaluate a novel voxel-based partial volume correction method for PET.
To improve the accuracy of radiopharmaceutical uptake measurements in PET images.

Main Methods:

Modeled partial volume effect as a convolution of the PET scanner's point spread function.
Applied iterative deconvolution with an edge-preserving smoothness constraint.
Utilized a Bayesian deconvolution framework solved by a conjugate gradient method.
Compared performance against the geometric transfer matrix (GTM) method using simulated and phantom data.

Main Results:

Effectively restored true PET activity for objects larger than the point spread function's full-width at half maximum.
Achieved quantitative accuracy comparable to the GTM method.
Demonstrated significant improvements in radioactivity quantification for cerebrospinal fluid, white matter, and gray matter in synthesized FDG-PET data.
Visual and quantitative assessments confirmed improved partial volume correction in synthesized and phantom experiments.

Conclusions:

The developed partial volume correction method enhances PET image quantification.
The method is comparable to the GTM approach but eliminates the need for MR image segmentation or prior tracer distribution information.
This voxel-based technique is particularly beneficial for integrated PET/MRI studies.