Table 2. Comparison of recent cardiac SPECT imaging systems20,21 .
| Parameters | D-SPECT | DNM | IQ-SPECT | Conventional |
| Collimation | Wide-angle parallel hole | Multiple pinhole | Multifocal (astigmatic) | Parallel hole |
| Number of detectors | 9 | 19 | 2 | 1 or 2 |
| Type of detector | CZT | CZT | NaI | NaI |
| Acquisition | Rotation (individual) | Stationary | Rotation (cardiac-centric) | Rotation (circular, ellipsoid, etc) |
| Attenuation correction | Not available | Optional CTAC1 | CTAC | Optional CTAC or transmission scan |
| Other position | Upright | Prone | Prone | Prone |
| Perform general SPECT | No | No | Yes | Yes |
1 Available with Discovery NM570c; CTAC, CT attenuation correction; CZT, cadmium-zinc-telluride; SPECT, single photon emission computed tomography.