IMAGE QUALITY EVALUATION & ASSURANCE WITH QUANTIFICATION OF STRIATAL UPTAKE
The Striatal Phantom optimizes quantitative imaging in patients, using PET or SPECT. This phantom is based upon a standard RSD head with a calvarial cut to insert or remove the brain shell easily. The nasal cavity and maxillary sinuses are filled with foam with a mass density of 0.23 g/cc.
|RS-900||Head without Brain Shell|
|RS-900T||Head with Transparent Brain Shell containing Striatum|
|RS-901T||Transparent Brain Shell with Striatum|
- Image quality evaluation
- Image registration quality assurance
- Quantification of striatal uptake
- SUV calculation and validation
The volume of the brain shell is about 1,260 ml. The volumes of the nucleus caudate and putamen are 5.4 ml and 6.0 ml respectively.
Fillable External Markers
Quantification of striatal uptake is not straightforward because it depends on a number of factors:
- Type of radionuclide used (Tc-99m, I-123 or F-18)
- Imaging factors such as: collimator type, amount of scatter and attenuation
- Image processing parameters such as: scatter and attenuation-correction techniques, type of reconstruction filter, slice thickness, region-of-interest size and its location
In normal subjects, the putamen and head of the nucleus caudate are small structures with typical dimensions of 7-15 mm in the axial plane (that is comparable to the system resolution). Since partial volume effects are more important for objects with dimensions less than twice the system resolution, the selection of imaging and reconstruction parameters is critically important in calculating the striatal-to-occipital ratio used to measure the relative striatal uptake in the brain.