Simulation study of a D-shape PET scanner for improved sensitivity and reduced cost in whole-body imaging
| Autor: | Taiga Yamaya, Abdella M. Ahmed, Hideaki Tashima |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
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Materials science Monte Carlo method Whole body imaging Signal-To-Noise Ratio 01 natural sciences Lyso 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Optics 0103 physical sciences Image Processing Computer-Assisted Humans Whole Body Imaging Radiology Nuclear Medicine and imaging Sensitivity (control systems) Image resolution Simulation Radiological and Ultrasound Technology Phantoms Imaging 010308 nuclear & particles physics business.industry Detector Equipment Design Positron-Emission Tomography Costs and Cost Analysis Reduced cost business Monte Carlo Method |
| Zdroj: | Physics in Medicine and Biology. 62(10):4107-4117 |
| ISSN: | 1361-6560 |
| Popis: | Much research effort is being made to increase the sensitivity and improve the imaging performance of positron emission tomography (PET) scanners. Conventionally, sensitivity can be increased by increasing the number of detector rings in the axial direction (but at high cost) or reducing the diameter of the scanner (with the disadvantages of reducing the space for patients and degrading the spatial resolution due to the parallax error). In this study, we proposed a PET scanner with a truncated ring and an array of detectors that can be arranged in a straight line below the bed. We called this system 'D-PET' as it resembles the letter 'D' when it is rotated by 90° in the counterclockwise direction. The basic design idea was to cut the unused space under the patient's bed; this area is usually not in use in clinical diagnosis. We conducted Monte Carlo simulations of the D-PET scanner and compared its performance with a cylindrical PET scanner. The scanners were constructed from 4-layer depth-of-interaction detectors which consisted of a 16 × 16 × 4 LYSO crystal array with dimensions of 2.85 × 2.85 × 5 mm3. The results showed that the D-PET had an increase in sensitivity and peak-NECR of 30% and 18%, respectively. The D-PET had low noise in the reconstructed images throughout the field-of-view compared to the cylindrical PET. These were achieved while keeping sufficient space for the patient, and also without a severe effect on the spatial resolution. Furthermore, the number of detectors (and hence the cost) of the D-PET scanner was reduced by 12% compared to the cylindrical PET scanner. |
| Databáze: | OpenAIRE |
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