水和其他过滤器对工业显微 CT 扫描中断口分辨率的影响

IF 0.8 Q4 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Forensic Imaging Pub Date : 2024-03-20 DOI:10.1016/j.fri.2024.200588
Mary R. Mani, Angi M. Christensen, Amani Rafiq
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引用次数: 0

摘要

众所周知,滤波可提高 CT 扫描的图像质量。水浸是一种过滤方法,已被用于 CT 扫描干燥(骨骼化)的骨骼,有人认为这种方法可以提高测量精度和骨折分辨率。这些测试以前都是在临床 CT 扫描仪上进行的。在这里,我们使用一台工业用微型 CT 扫描仪,测试水浸泡和其他 X 射线过滤选项是否能提高干骨重建扫描的骨折分辨率。对这些骨骼进行了以下扫描:(1) 在未经过滤的 "干燥 "空气环境中;(2) 在 X 射线源处使用金属过滤器;(3) 将骨骼浸泡在水中。对一小部分骨骼(N = 3)也使用相同的参数进行扫描,只是将获取的投影次数从 500 增加到 1500。结果显示,增加投影次数对骨折分辨率的改善最大,其次是在 X 射线源处进行过滤。水浸法的整体表现较差,这可能是由于这种扫描方式在扫描过程中标本在平台上旋转而产生的运动伪影。在使用这种 CT 扫描仪时,如果希望提高骨折分辨率,不建议使用水浸法;建议增加投影次数或在 X 射线源处进行过滤。
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Effects of water and other filters on fracture resolution in industrial micro-CT scanning

Filtering is known to improve image quality of CT scans. Water immersion is one type of filtering that has been used for CT scanning dry (skeletonized) bones, and it has been suggested that this approach can increase measurement accuracy and improve fracture resolution. These tests have previously involved clinical CT scanners. Here we use an industrial micro-CT scanner and test whether water immersion and other x-ray filtering options increases fracture resolution in reconstructed scans of dry bones.

Eleven dry non-human bones were CT scanned using the same acquisition parameters, while varying filter options. Bones were scanned (1) in an unfiltered “dry” air environment, (2) using metal filters at the x-ray source, and (3) with the bones immersed in water. A small subset of bones (N = 3) was also scanned using the same parameters except increasing the number of projections acquired from 500 to 1500. Reconstructed scans were evaluated by the authors, in part using a Likert scale comparing filtered with unfiltered scans, to assess fracture resolution (overall appearance and extent).

Results showed that increasing the projections resulted in the greatest improvement in fracture resolution, followed by filtering at the x-ray source. Water immersion performed poorly overall, possibly due to movement artifacts that result from this type of scanning, in which the specimen rotates on a stage during the scan. When using this type of CT scanner, if increased fracture resolution is desired, water immersion is not recommended; increasing the number of projections or filtering at the x-ray source is suggested instead.

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来源期刊
Forensic Imaging
Forensic Imaging RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
2.20
自引率
27.30%
发文量
39
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