To check the performance of SPECT

γ-camera and scanner in Shanghai

and to promote applying quality of nuclear medical imaging instrumentation. (1) Performance phantom (76-823 source tank

76-824 set of 3 inserts): It permits measurements of the resolution of "hot" lesions in a "cold" field

"cold" lesions in a "hot" field

linearity

uniformity of response to a uniform field. (2) Hoffman brain phantom (model No.9000): Providing a truly three-dimensional model of the radioisotope distribution in the normal patient brain. The size and structure of the phantom including the gray and white matter subsections

are representative of studies in emission tomography. The phantom simulates the 4:1 gray to white matter uptake ratio

that is normally seen in studies such as 123 I and 99m Tc brain perfusion imaging in SPECT. (3) Thyroid phantom: Composing of three "cold" lesions whose diameters are 8

10 and 12mm and one "hot" lesion whose diameter is 10mm. Left lobe is 9mm thick while right one 18mm thick. There are 22 SPECT scanners including 8 double-detector SPECT and 14 single-detector SPECT. Of the 22 SPECT 16 were qualified in uniformity. The "hot" lesions were 9-10mm with Double-detectors

11-12mm with single-detector; while the "cold" lesions were about 10mm and 11-12mm respectively. The brain imaging is not very good generally. 50% of γ-cameras were not qualified in uniformity. Scanners did not detect the thyroid phantom "cold" or "hot" lesion. According to the quality control results

the applying performance of nuclear medicine imaging instrumentation is relative satisfactory in Shanghai.