评价颅颌面STL的立体光刻(STL)测量准则。

IF 3.2 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Henra Muller, Annabel Fossey
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引用次数: 0

摘要

背景:面部畸形往往需要重建手术和放置三维(3D)打印颅颌面假体。假体制造需要患者的计算机断层扫描(CT)图像。图像质量差导致假体尺寸不正确,需要重复成像和重新组装。快速成型和制造中心(CRPM)生产了南非大多数的面部假体,但没有规定的优化CT协议。因此,进行了这项研究。方法:收集CRPM stl用于颅颌面修复体的设计和制造。评价CRPM CT扫描的STL文件的图像质量,以确定什么是良好的图像质量。这个集合被仔细检查,包括在图像质量评估。经过仔细审查,选择35例年龄≥15岁的stl,并将元数据附加到DICOM文件中。此外,只有未经同一设计器操作而创建的stl才包含在集合中。在定性评价stl之前,在专家组的协助下确定了8个不同的关键解剖参考点(carp)。每个鲤鱼的视力评定量表分为3个类别,其中1为视力差,2为部分,3为良好。同样,为同心圆的存在和由参与设计和制造假体的两位设计师授予的总体印象评分设计了评分量表。然后,包括两位设计师在内的三位专家组成的团队在结构化评估会议期间将该立体光刻测量准则(SMR)应用于35个stl。得分用于计算汇总统计和推断统计。结果:以部分视力中心评分为分组。三位评估者的平均总CARP得分为13.1 ~ 14.4分(最大可能得分24分),平均总CARP +环得分为15.8 ~ 17.1分(最大可能得分27分)。评估者的得分之间没有显著差异。结论:该SMR似乎是同类研究中的首例。对stl的图像质量评估为更精细的CT图像质量评估奠定了基础,为CRPM设计和制造精确的内颅假体制定CT成像方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Stereolithography (STL) measurement rubric for the evaluation of craniomaxillofacial STLs.

Stereolithography (STL) measurement rubric for the evaluation of craniomaxillofacial STLs.

Background: Facial deformities often demand reconstructive surgery and the placement of three-dimensional (3D) printed craniomaxillofacial prostheses. Prostheses manufacturing requires patients' computed tomography (CT) images. Poor quality images result in incorrectly sized prostheses, necessitating repeat imaging and refitting. The Centre for Rapid Prototyping and Manufacturing (CRPM) produces most facial prostheses in South Africa but does not have a prescribed optimised CT protocol. Therefore, this study was undertaken.

Methods: A collection of CRPM STLs used in the design and manufacturing of craniomaxillofacial prostheses is available. The image quality of stereolithography (STL) files of CRPM CT scans was evaluated to determine what constitutes good image quality. This collection was scrutinised for inclusion in the image quality evaluation. After scrutiny, 35 STLs of individuals ≥15 years of age were selected and included metadata attached to the DICOM file. Furthermore, only STLs created without manipulation by the same designer were included in the collection. Before the qualitative evaluation of the STLs, eight different critical anatomical reference points (CARPs) were identified with the assistance of an expert team. A visual acuity rating scale of three categories was devised for each CARP, where 1 was allocated to poor visual acuity, 2 to partial, and 3 to good visual acuity. Similarly, rating scales were devised for the presence of concentric rings and the overall impression score awarded by the two designers involved in the design and manufacturing of the prostheses. This stereolithography measurement rubric (SMR) was then applied to the 35 STLs by a team of three experts, including the two designers, during a structured evaluation session. The scores were used to calculate summary and inferential statistics.

Results: Scores grouped around the central rating of partial visual acuity. The three evaluators' mean total CARP scores ranged from 13.1 to 14.4 (maximum possible score 24), while the mean total CARP + ring scores ranged from 15.8 to 17.1 (maximum possible score 27). No significant differences were detected between the evaluators' scores.

Conclusion: This SMR appears to be the first of its kind. This image quality assessment of STLs provides the groundwork for finer CT image quality evaluation to formulate a CT imaging protocol for the CRPM to design and manufacture accurate internal cranial prostheses.

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