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Pet/specd systems, like any imaging device, require periodic performance testing。
The carlson model, the carlson qa module, and the carlson spect performance model contributed to providing data for such assessments. It allows the measurement of the resolution of “hot” pathologies in cold fields, “cold” pathologies in “hot” (or radioactive) fields, linearity, homogeneity of response to even fields, and a simple method of finding a rotary centre. In addition, more complex tests can be performed through the measurement point extension function, suitable for acceptance testing
From which you can calculate mtf。
There are three insertions for the carlson spect qa module:
Heat zone plugin
Cold zone pathological resolution plugin
Linear/system plugin
Carlson module, carlson spect qa module meets the following criteria:
Gb/t1898. 2-2013 and iec 61675-2: 1998, mod, nemanu1-2007, jjf 2044-2023
Cold area plugin
The cold zone plugins are seven organic glass rods and solid ball (yellow abs) (see figure below), recommended 4. 7 mm, 5. 9 mm, 7. 3 mm, 9. 2 mm, 11. 4 mm, 14. 3 mm, 17. 9 mm with the same diameter as the corresponding bar。
When radioactive solutions are injected into the module, the rod and sphere are cold。
Hot zone plugin
Thermal zone plugins are eight pairs of round holes in organic glass (see figure below) and are recommended for 4. 7 mm, 5. 9 mm, 7. 3 mm, 9. 2 mm, 11. 4 mm, 14. 3 mm, 17. 9 mm, 22. 4 mm in diameter。
When radioactive solutions are injected into the modulus, the arctic zone is thermal。
Carlson spectact performance model space linear and evenness plugin
The space linear and evenity plugins are organic glass blocks of a staggered grid consisting of 32 square holes (see figure below)。