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A dual modality approach to quantitative quality control in emission tomography
Michael D R Thomas1, Dale L Bailey, Lefteris Livieratos
1Joint Department of Physics, Institute of Cancer Research, Royal Marsden Hospital, Sutton, UK.
Physics in Medicine and Biology
|July 21, 2005
Summary
This study introduces an objective method for emission tomography quality control (QC) using CT data. By creating synthetic scans, it enables quantifiable assessments of SPECT and PET system performance.
Area of Science:
- Medical Imaging
- Nuclear Medicine
- Radiology
Background:
- Current quality control (QC) for emission tomography (ET) like SPECT and PET is largely qualitative.
- Combined SPECT/CT and PET/CT systems offer potential for improved QC using high-resolution structural information.
- Objective performance assessment is needed for ET devices and reconstructed images.
Purpose of the Study:
- To explore the use of X-ray CT data from QC phantoms for objective performance assessment of ET devices.
- To develop a method for creating high-resolution synthetic ET scans from CT data.
- To enable quantifiable evaluation of image quality parameters.
Main Methods:
- A novel ET QC phantom's CT reconstruction was segmented.
- Voxel values were adjusted to simulate radioactivity concentrations, creating a synthetic 'perfect' ET scan.
- Image co-registration aligned synthetic and measured SPECT scans for parameter derivation.
Main Results:
- The approach successfully generated high-resolution synthetic SPECT scans.
- Objective parameters like spatial resolution (FWHM) and recovered contrast were estimated.
- Two independent methods for spatial resolution measurement showed excellent agreement.
Conclusions:
- High-resolution synthetic phantoms derived from CT data provide an objective approach to ET QC.
- This method allows for quantifiable assessment of system performance and protocol optimization.
- The technique is readily automatable and suitable for rigorous QC in SPECT and PET imaging.