Discussion: MAR Dosimetric differences revealed between original and MAR corrected CT scans can be substantial.
{"Image DocumentName": "Discussion: MARDosimetric differences revealed between original and MAR corrected CT scans can be substantial.", "Image ImageDescription": "For double rod phantom cases in a series of configurations, the maximum dose difference observed was 52.7 cGy for 200 cGy RX (26.4% diff) for MC_Dmed. For the 3D planning patient cases, beams traversed directly through the metal rods, up to 8 +/- 24% mean dose differences were observed. For bilateral hip implant cases, significant underdosing observed between the metal implants (max difference = 106%) for MC_Dmed. This suggests caution should be exercised when using original CT scans to calculate dose, as significant underdosing can occur. In clinical practice, some clinics will combat this by overriding density in this region with a uniform value. Even if mean dose differences between MAR corrected and uncorrected cases are small, significant hot/cold spots (local regions) are observed when CT to electron density table equates MAR-affected regions to density near air.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}