From: Quantitative capabilities of four state-of-the-art SPECT-CT cameras
Name | Type | Corrections | Noise regularization | Manufacturer default number of | |||
---|---|---|---|---|---|---|---|
Attenuation | Scatter | Resolution | Subsets | Iterations | |||
General Electric Evolution for Bone | MAPEM | From CT data, bilinear conversion of HU into attenuation coefficients at 140 keV | Jaszczak’s dual energy window method with 115 to 125 keV scatter window | Matrix rotation | One-step late method with green prior and median root prior at last iteration | 10 | 2 |
Row convolution with spatial resolution kernel stored in look-up table | |||||||
Philips Astonish | OSEM | From CT data, HU segmentation using a step-like law, bilinear conversion of HU into attenuation coefficients at 100 keV, scaling to 140 keV | ESSE method | Convolution with spatial response function | Proprietary filtering (Hanning) of acquired projections and computed projections by forward-projection | 15 | 2 |
Siemens Flash 3D | OSEM | From CT data, bilinear conversion of HU into attenuation coefficients at 140 keV | Modified triple energy window method with 108.5 to 129.5 keV scatter window | Matrix rotation | Gaussian post-filter (6-mm FWHM default value) | 4 | 12 |
Gaussian diffusion method with slabs |