锥形束 CT 中的罐印效应伪影的特征描述和校正。
Characterization and correction of cupping effect artefacts in cone beam CT.
机构信息
Department of Oral Health and Diagnostic Sciences, Georgia Health Sciences University, College of Dental Medicine, Georgia 30912-1241, USA.
出版信息
Dentomaxillofac Radiol. 2012 Mar;41(3):217-23. doi: 10.1259/dmfr/19015946.
Abstract
OBJECTIVE
The purpose of this study was to demonstrate and correct the cupping effect artefact that occurs owing to the presence of beam hardening and scatter radiation during image acquisition in cone beam CT (CBCT).
METHODS
A uniform aluminium cylinder (6061) was used to demonstrate the cupping effect artefact on the Planmeca Promax 3D CBCT unit (Planmeca OY, Helsinki, Finland). The cupping effect was studied using a line profile plot of the grey level values using ImageJ software (National Institutes of Health, Bethesda, MD). A hardware-based correction method using copper pre-filtration was used to address this artefact caused by beam hardening and a software-based subtraction algorithm was used to address scatter contamination.
RESULTS
The hardware-based correction used to address the effects of beam hardening suppressed the cupping effect artefact but did not eliminate it. The software-based correction used to address the effects of scatter resulted in elimination of the cupping effect artefact.
CONCLUSION
Compensating for the presence of beam hardening and scatter radiation improves grey level uniformity in CBCT.
摘要
目的
本研究旨在展示并纠正锥形束 CT（CBCT）图像采集过程中由于束硬化和散射辐射引起的杯状伪影。
方法
使用均匀的铝制圆柱体（6061）在 Planmeca Promax 3D CBCT 设备（芬兰赫尔辛基的 Planmeca OY）上演示杯状伪影。使用 ImageJ 软件（美国马里兰州贝塞斯达的国立卫生研究院）对灰度值的线轮廓图进行研究。使用基于硬件的铜预过滤校正方法来解决由束硬化引起的这种伪影，使用基于软件的减法算法来解决散射污染。
结果
用于解决束硬化影响的基于硬件的校正方法抑制了杯状伪影，但并未完全消除它。用于解决散射影响的基于软件的校正方法消除了杯状伪影。
结论
补偿束硬化和散射辐射的存在可提高 CBCT 中的灰度均匀性。
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