Table 3 Image quality assessment of images produced from iterative reconstruction of SMS images with different parameters, for 8 patients (see Table 1 for definition of rating scales). λσ indicates the degree of spatial regularisation, whilst λτ indicates the extent of temporal regularisation. SMS-iter 6 (λσ 0.001 λτ 0.005) had the highest overall image quality and the lowest amount of sequence related artifact. Results are mean ± standard deviation. Contrast ratio calculated as the ratio peak blood pool signal intensity: peak myocardial signal intensity
Iterative reconstruction parameters | Overall Image Quality | Perceived SNR | Sequence Related Artifact | Patient Related Artifact | Contrast Ratio |
|---|---|---|---|---|---|
SMS-iter 1 (λσ 0.0005 λτ 0.0005) | 1.63 ± 0.74 | 1.63 ± 0.52 | 0.69 ± 1.10 | 0.89 ± 1.36 | 3.64 ± 0.37 |
SMS-iter 2 (λσ 0.001 λτ 0.001) | 1.88 ± 0.35 | 1.63 ± 0.52 | 0.31 ± 0.59 | 0.89 ± 1.36 | 3.73 ± 0.44 |
SMS-iter 3 (λσ 0.0025 λτ 0.0025) | 1.50 ± 0.53 | 2.00 ± 0.00 | 0.63 ± 1.27 | 1.00 ± 1.41 | 3.80 ± 0.47 |
SMS-iter 4 (λσ 0.005 λτ 0.005) | 1.25 ± 0.46 | 1.88 ± 0.35 | 1.88 ± 1.62 | 1.00 ± 1.41 | 3.93 ± 0.51 |
SMS-iter 5 (λσ 0.001 λτ 0.0025) | 2.13 ± 0.35 | 2.13 ± 0.35 | 0.25 ± 0.38 | 0.78 ± 1.40 | 3.63 ± 0.40 |
SMS-iter 6 (λσ 0.001 λτ 0.005) | 2.50 ± 0.53 | 2.25 ± 0.46 | 0.13 ± 0.35 | 0.56 ± 1.01 | 3.62 ± 0.39 |
SMS-iter 7 (λσ 0.001 λτ 0.01) | 2.00 ± 0.53 | 2.25 ± 0.46 | 0.56 ± 0.86 | 0.67 ± 1.32 | 3.64 ± 0.40 |