CAJ | 학술논문

金属伪影严重地影响CT图像的质量及其医学诊断价值。考虑到临床数据的可靠性及时效性，正弦图修复及其改进的方法已成为近年来研究的热点。典型的NMAR方法（Normalized Metal Artifact Reduction），多数情况下能准确地恢复原始数据，并尽可能少地残留或引入新的伪影。然而当出现高密度组织（骨头等）与金属不相邻时，就会在金属与高密度组织间不可避免地引入或残留部分伪影。本文在NMAR算法的基础上，引入了一种基于正弦图中轨迹修复的金属伪影去除方法（TNMAR）。具体地，在NMAR方法中正弦图归一化后的区域修复期间，引入了高密度组织轨迹方向的平滑修复。此方法一定程度上削减了NMAR修复后金属与高密度组织间的残留伪影，且尽可能地恢复了原图的高对比度及组织细节。临床中，有很高的应用价值。
금속위영엄중지영향CT도상적질량급기의학진단개치。고필도림상수거적가고성급시효성，정현도수복급기개진적방법이성위근년래연구적열점。전형적NMAR방법（Normalized Metal Artifact Reduction），다수정황하능준학지회복원시수거，병진가능소지잔류혹인입신적위영。연이당출현고밀도조직（골두등）여금속불상린시，취회재금속여고밀도조직간불가피면지인입혹잔류부분위영。본문재NMAR산법적기출상，인입료일충기우정현도중궤적수복적금속위영거제방법（TNMAR）。구체지，재NMAR방법중정현도귀일화후적구역수복기간，인입료고밀도조직궤적방향적평활수복。차방법일정정도상삭감료NMAR수복후금속여고밀도조직간적잔류위영，차진가능지회복료원도적고대비도급조직세절。림상중，유흔고적응용개치。
Metal artifacts drastically impair the image quality in CT images and often reduce their diagnostic value.Con-sidering the reliability and timeliness of the clinical data,the typical NMAR(Normalized MAR)algorithm is in general suc-cessful in removing metal artifacts,and contains the least residual and newly-introduced artifacts.However,in some cir-cumstances metals are adjacent to bones of high density,that will inevitably induce the new artifacts or residual artifacts be-tween the bones and metals.Based on NMAR,this paper introduces the Trace-based Normalized Metal Artifact Reduction (TNMAR).Specifically,during the normalized regional repair in sinogram,we introduce the bone-trace-based repair.It considerably reduced the newly introduced metal artifacts between the bones and metals,while greatly preserving the orignal high contrast and the accuracy of tissue details.In clinical medicine,it has great application value.