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SU‐E‐J‐200: Impact of FDG‐PET/CT Reconstruction Parameters On PET Variability and Treatment Response Assessment

Publication ,  Conference
Rankine, L; Bowsher, J; Brizel, D; Yin, F; Das, S
Published in: Medical Physics
January 1, 2013

Purpose: To examine the effect of PET image reconstruction parameters on baseline and early‐treatment FDG‐PET/CT quantitative imaging. Early‐treatment changes in tumor metabolism in primary tumor and nodes can potentially determine if the patient is responding to therapy, but this assessment can change based on the reconstruction parameters. We investigate the effect of the following reconstruction parameters: number of Ordered‐Subset‐Expectation‐Maximization (OSEM) iterations, post‐reconstruction smoothing, and quantitative metrics (SUV‐max, SUV‐mean, SUV‐peak). Methods: 11 patients on an IRB‐approved study underwent 2 baseline PET scans (mean‐separation=11 days) prior to chemoradiotherapy (70Gy,2Gy/fraction). An intra‐treatment PET scan was performed early in the course of therapy (10‐20Gy,mean=14Gy). The images were reconstructed with varying OSEM iterations (1–12) and Gaussian filtering (1–7mm). For each combination of iterations and smoothing, Bland‐Altman analysis was applied to quantitative metrics (SUV‐max, SUV‐mean, SUV‐peak) from the baseline scans to evaluate metabolic variability (repeatability=1.96σ). The number and extent of early treatment changes that were significant, i.e. exceeding repeatability, was assessed. Results: Repeatability improved with increasing smoothing and decreasing iterations from SUV=3.9 (iterations=12,smoothing=1mm) to SUV=2.1 (iterations=1,smoothing=7mm). The average number of cases exceeding repeatability averaged over all metrics (SUV‐max, SUV‐mean, SUV‐peak) and all structures (primary, nodes) improved with increasing smoothing and decreasing iterations from 3.3 cases (ΔSUVgt;repeatability=17%) for iterations=12 and smoothing=1mm to 3.9 cases (ΔSUVgt;repeatability=19%) for iterations=1 and smoothing=5.5mm. Smoothing beyond 5.5mm deteriorated results. Practically, several combinations provided comparable performance (low repeatability,high number/extent of intra‐treatment cases exceeding repeatability): 1 iteration with 1–5.5 mm smoothing, 2 iterations with 2–5.5 mm smoothing, 4 iterations with 4–5.5 mm smoothing. In general, increasing iterations increased the lower limit of filter size required. Conclusion: Images reconstructed for quantitative analysis may benefit from a low number of OSEM iterations (1–2). Some post‐reconstruction smoothing was beneficial, however, oversmoothing for the sake of more qualitatively appealing images may prove detrimental to quantitative response assessment analysis. © 2013, American Association of Physicists in Medicine. All rights reserved.

Duke Scholars

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2013

Volume

40

Issue

6

Start / End Page

197

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
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Rankine, L., Bowsher, J., Brizel, D., Yin, F., & Das, S. (2013). SU‐E‐J‐200: Impact of FDG‐PET/CT Reconstruction Parameters On PET Variability and Treatment Response Assessment. In Medical Physics (Vol. 40, p. 197). https://doi.org/10.1118/1.4814412
Rankine, L., J. Bowsher, D. Brizel, F. Yin, and S. Das. “SU‐E‐J‐200: Impact of FDG‐PET/CT Reconstruction Parameters On PET Variability and Treatment Response Assessment.” In Medical Physics, 40:197, 2013. https://doi.org/10.1118/1.4814412.
Rankine L, Bowsher J, Brizel D, Yin F, Das S. SU‐E‐J‐200: Impact of FDG‐PET/CT Reconstruction Parameters On PET Variability and Treatment Response Assessment. In: Medical Physics. 2013. p. 197.
Rankine, L., et al. “SU‐E‐J‐200: Impact of FDG‐PET/CT Reconstruction Parameters On PET Variability and Treatment Response Assessment.” Medical Physics, vol. 40, no. 6, 2013, p. 197. Scopus, doi:10.1118/1.4814412.

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2013

Volume

40

Issue

6

Start / End Page

197

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences