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Nema nu 4-2008 standardFormulation: national electrical manufacturers association of the united states (natio)Nema:
Release: 2008, accepted performance assessment criteria for small animals in pet
Scope of application: designed for small animals such as mice, rats and pet imaging systems for equipment acceptance testing, quality control and research comparison
Nema small animal pet model, small animal pet model parameter description:
| Id | Parameters |
| Total size | 63 mm long x 33 mm diameter, pmma material |
| Main components | Hot point section: 5 cylindrical rods with a diameter of 1mm, 2mm, 3mm, 4mm, 5mm long
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| Material properties | Pmma density approximately 1. 19g/cm3, close to bioorganism decay factor, simulates the tissue properties of small animals |
| Filling method | Parts can be independently filled with radioactive tracers (e. G. 18f, 68ga, 11c, etc.) to facilitate quantitative assessment |
Nema small animal pet body model, small animal pet module core test project and evaluation indicators
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Spatial resolution assessmentMeasured by 5 heat rods of different diameters, calculatedSemi-high width (fwhm)AndHalf-high and wide (fwtm)
- Reflecting the system's resolution of microstructures is a key performance indicator for small animals pet
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Contrast recovery factor (co){\chffffff}{\ch00ffff}Measuring the recovery of signals from different diameter heat rods in a flat background, calculation formula: crc = (average number of bars - average number of background count)/ average number of background count x 100%
- Assessing the system's ability to detect signals at different contrasts, which directly affects the detection rate of microclinics such as tumours
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Noise properties (%std)Calculates the relative standard deviation of the pixel value of the flat area, reflecting image noise ratio (snr) performance
- Noise levels directly affect the accuracy and repetition of quantitative analysis
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Spillover ratio, sorAssessment of the spread of radioactive signals from high-activity to low-activity areas through measurements of cold areas (water and air cavity)
- To verify the accuracy of decay correction and dispersive correction algorithms, especially signal inhibition of cold zone boundaries
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Evenness assessmentMeasuring the consistency of signal distribution in the homogeneity area, assessing detector responsiveness and reconstructing algorithms yes