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A lesion detection observer study comparing 2-dimensional versus fully 3-dimensional whole-body PET imaging
Carole Lartizien1, Paul E Kinahan, Claude Comtat
1Centre d'Exploration et de Recherche Médicales par Emission de Positons, Hopital Neurologique, University Claude Bernard, Lyon, France.
Summary
Higher injected doses in 2D PET imaging improved tumor detection compared to 3D imaging. While 3D acquisition offered equivalent performance at peak rates, 2D protocols with higher doses yielded the best results for detecting lesions.
Area of Science:
- Nuclear Medicine
- Medical Imaging Physics
Background:
- Whole-body (18)F-FDG PET imaging is crucial for tumor detection.
- Comparing 2D and 3D acquisition modes is essential for optimizing performance.
Purpose of the Study:
- To evaluate the impact of 2D versus 3D acquisition modes on human observer performance in detecting and localizing tumors in whole-body (18)F-FDG PET images.
- To determine the optimal acquisition protocol for tumor detection based on injected dose and acquisition mode.
Main Methods:
- Simulated whole-body PET data using the MCAT phantom with realistic noise properties.
- Compared 2D and 3D acquisition protocols with varying injected doses (444 MBq and 740 MBq).
- Human observers analyzed data using volumetric displays, with performance assessed via AFROC analysis.
Main Results:
- The 2D protocol with a 740 MBq injected dose demonstrated the highest overall tumor detection performance.
- Fully 3D acquisition at peak NEC rates (444 MBq) showed better performance than 2D at the same dose.
- Detection performance varied significantly across different organs.
Conclusions:
- For the studied patient size and scanner, 3D acquisition offered comparable or superior performance to 2D at equivalent peak NEC rates.
- Higher injected doses in 2D protocols led to the best tumor detection capabilities.
- Organ-specific differences highlight the need for tailored imaging strategies.