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Table 2 Absolute and relative HU deviation in the scan with large head MoM THA prosthesis scans with and without O-MAR with filter A and iDose4 level 5 compared to baseline for pellets L0, L5, L6 and L8

From: Quantitative analysis of orthopedic metal artefact reduction in 64-slice computed tomography scans in large head metal-on-metal total hip replacement, a phantom study

Scan protocol Pellet Δ |HU| Δ HU % Δ |HU| Δ |HU|
O-MAR off O-MAR off (%) O-MAR on % O-MAR on (%)
120 kVp, 150 mAs L0 0 0 0 0
L5 102 41 52 21
L6 291 111 101 38
L8 795 306 538 207
120 kVp, 600 mAs L0 0 0 0 0
L5 79 30 57 22
L6 238 93 82 32
L8 766 297 517 200
140 kVp, 101 mAs L0 6 3 6 3
L5 115 47 70 28
L6 276 118 81 35
L8 796 337 531 225
140 kVp, 405 mAs L0 0 0 13 5
L5 94 39 57 24
L6 271 113 83 34
L8 799 341 517 219
  1. Significant positive effect of OMAR (p < 0.001) for pellet L5, L6 and L6 regarding absolute and percentage of change in HU values caused by metal artefacts