Nuclear Medicine Planar Only Images (Uniformity) |
Tc99m or Co57 |
Intrinsic or System Uniformity |
Excellent: No visible nonuniformity or artifacts in the images.Good: Minor variation in intensity or artifacts visible in the images but they are unlikely to affect interpretation of clinical studies.Satisfactory: Some variation in intensity or artifacts visible in the images but they are unlikely to affect interpretation of clinical studies.Marginal: Significant variation in intensity is visible and it may affect interpretation of high count density clinical studies.Fail: Non-uniformities are of such magnitude that they probably will affect the interpretation of clinical studies and the instrument should not be used for clinical studies. |
Nuclear Medicine Planar Only Images (4-quadrant bar phantom) |
Tc99m or Co57 |
Intrinsic spatial resolution images |
Satisfactory: 2.5 to 2.9 mm bars are resolved in one quadrant of a four quadrant pattern and they have low contrast | Marginal: 3.0 to 3.4 mm bars resolved in one quadrant of a four quadrant pattern |
System spatial resolution images |
Satisfactory: 3.0 to 3.4 mm bars are resolved in one quadrant of a four quadrant pattern | Marginal: 3.5 to 3.9 mm bars resolved in one quadrant of a four quadrant pattern |
Tl201, Ga67, or In111 |
Intrinsic spatial resolution images |
Satisfactory: 3.0 to 3.4 mm bars are resolved in one quadrant of a four quadrant pattern and they have low contrast | Marginal: 3.5 to 3.9 mm bars resolved in one quadrant of a four quadrant pattern |
System spatial resolution images |
Satisfactory: 3.5 to 3.9 mm bars are resolved in one quadrant of a four quadrant pattern | Marginal: 4.0 to 4.4 mm bars resolved in one quadrant of a four quadrant pattern |
ACR Phantom Spatial Resolution Tc99m using the ACR-approved SPECT Phantom (At least 75% of the rods in a segment must be visualized to qualify a set as “seen”) |
General purpose parallel hole collimators |
Satisfactory: 9.5 mm rods resolved with high contrast | Marginal: 9.5 mm rods resolved with low contrast |
High resolution parallel hole collimators |
Satisfactory: 7.9 mm rods resolved with high contrast | Marginal: 7.9 mm rods resolved with low contrast |
ACR Phantom Spatial Resolution Tl-201, Ga-67, or In111 using the ACR-approved SPECT Phantom (At least 50% of the rods in a segment must be visualized to qualify a set as “seen”) |
General purpose parallel hole collimators (Tl201) OR Medium energy general purpose parallel hole collimators (Ga-67 or In111) |
Satisfactory: 11.1 mm rods visible | Marginal: 12.7 mm rods visible |
High resolution parallel hole collimators (Tl-201) |
Satisfactory: 9.5 mm rods visible | Marginal: 11.1 mm rods visible |
Nuclear Medicine SPECT Phantom (Deluxe Phantom - Small phantom must meet same criteria) (If a phantom receives 2 scores of Marginal this equals a FAIL) |
Tc99m SPECT |
Uniformity (GP and HR) |
Satisfactory [3]: Artifacts are seen in only a few slices of the complete set but are not thought to be clinically significant. | Marginal [2]: Significant artifacts visualized in one or more slices but they probably would not affect the interpretation of clinical studies. |
Fail [1]: Strong artifacts visualized in one or more slices of such magnitude that they probably will affect the interpretation of clinical studies and the instrument should not be used for clinical studies. |
Spatial Resolution (GP and HR) |
Satisfactory: 11.1 mm rods resolved with low contrast | Marginal: 12.7 mm rods resolved with high contrast |
Contrast (GP and HR) |
Satisfactory: 19.1 mm and larger spheres resolved with high contrast | Marginal: 25.4 mm and larger spheres resolved with low contrast |
PET Phantom(If a phantom receives 2 scores of Marginal this equals a FAIL) |
Contrast |
Satisfactory: 12 mm vial is resolved with low contrast; larger vials resolved with high contrast | Marginal: 16 mm vial is resolved with acceptable contrast; larger vials resolved with high contrast |
Spatial Resolution |
Satisfactory: 9.5 mm rods are resolved with low contrast; larger rods are resolved with high contrast | Marginal: 11.1 mm rods are resolved with low contrast; larger rods are resolved with high contrast |
Uniformity |
Satisfactory: Artifacts are seen in only a few slices of the complete set but are not thought to be clinically significant. | Marginal: Strong artifacts are seen in a small number of slices. |
PASS/FAIL CRITERIA for SUV Measurements Mean Bkgd: 0.90 – 1.1025 mm cylinder: >1.87 - <2.9116/25 ratio: >.7 |
