An investigation into the effect of changing the computed tomography slice reconstruction interval on the spatial replication accuracy of three‐dimensional printed anatomical models constructed by fused deposition modelling

摘要

Introduction Three‐dimensional (3D) printed models can be constructed utilising computed tomography (CT) data. This project aimed to determine the effect of changing the slice reconstruction interval (SRI) on the spatial replication accuracy of 3D‐printed anatomical models constructed by fused deposition modelling (FDM). Methods Three bovine vertebrae and an imaging phantom were imaged using a CT scanner. The Queensland State Government’s Animal Care and Protection Act 2001 did not apply as no animals were harmed to carry out scientific activity. The data were reconstructed into SRIs of 0.1, 0.3, 0.5 and 1?mm and processed by software before 3D printing. Specimens and printed models were measured with calipers to calculate mean absolute error prior to statistical analysis. Results Mean absolute error from the original models for the 0.1, 0.3, 0.5 and 1?mm 3D‐printed models was 0.592?±?0.396?mm, 0.598?±?0.479?mm, 0.712?±?0.498?mm and 0.933?±?0.457?mm, respectively. Paired t‐tests (P??0.05) indicated a statistically significant difference between all original specimens and corresponding 3D‐printed models except the 0.1?mm vertebrae 2 (P?=?0.061), 0.3?mm phantom 1 (P?=?0.209) and 0.3?mm vertebrae 2 (P?=?0.097). Conclusion This study demonstrated that changing the SRI influences the spatial replication accuracy of 3D‐printed models constructed by FDM. Matching the SRI to the primary spatial resolution limiting factor of acquisition slice width or printer capabilities optimises replication accuracy.