减少临床光子计数探测器计算机断层扫描中的金属伪影--一项示范性全髋关节置换术的模型研究。

IF 1.9 3区 医学 Q2 ORTHOPEDICS Skeletal Radiology Pub Date : 2024-11-19 DOI:10.1007/s00256-024-04820-2
Roy P Marcus, Georg C Feuerriegel, Adrian A Marth, Sophia S Goller, Daniel Nanz, Julian Anhaus, Reto Sutter
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引用次数: 0

摘要

目的研究不同的光子计数探测器(PCD)CT 扫描和重建方法如何影响髋关节假体模型的金属伪影量和图像质量:使用临床 PCD-CT 扫描钛和钴铬钼合金全髋关节假体模型,采用恒定管电位(140 kV)和计算机断层扫描剂量指数(7 mGy)。使用了不同的扫描设置:带/不带锡滤波器(Sn)、带/不带超高分辨率(UHR),既有单独设置,也有组合设置,形成四种模式:Quantumplus(标准)、UHR Quantumplus(高分辨率)、QuantumSn(标准-锡)和 UHR QuantumSn(高分辨率-锡)。重建包括跨度为 40-190 千伏的虚拟单能图像 (VMI) 和多色图像,其中包括/不包括金属伪影迭代还原 (MAR)。三维打印软件渲染的伪影体积以毫升(ml)为单位进行量化,图像质量采用李克特评分法进行评估:多色重建:锡滤波器减少了伪影体积(298(标准-锡)对 347 毫升(标准)和 310(高分辨率-锡)对 360 毫升(高分辨率))。在高分辨率 MAR 中测得的伪影体积最小(150 毫升)。VMI 重建:标准 130 千伏(150 毫升)和高分辨率 130 千伏(164 毫升)以及标准-锡 120 千伏(169 毫升)和高分辨率-锡 120 千伏(172 毫升)测量到的伪影体积最小。MAR 将伪影体积进一步缩小到 130 毫升(标准 150 千伏 MAR)和 140 毫升(高分辨率 160 千伏 MAR)。图像质量最好的是标准 65 keV MAR、多色高分辨率 MAR、标准 100 keV MAR、多色标准锡 MAR、高分辨率锡 100 keV 和多色高分辨率锡:结论:在 VMI 或多色图像中将锡滤波器、UHR 和 MAR 结合使用可最大程度地减少伪影。
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Reducing Metal Artifacts in Clinical Photon Counting Detector Computed Tomography-A Phantom Study of an Exemplary Total Hip Arthroplasty.

Objective: To examine how different photon-counting detector (PCD) CT scanning and reconstruction methods affect the volume of metal artifacts and image quality for a hip prosthesis phantom.

Methods: A titanium and cobalt-chromium-molybdenum-alloy total hip prosthesis phantom was scanned using a clinical PCD-CT with a constant tube potential (140 kV) and Computed-Tomography-Dose- Index (7 mGy). Different scan settings were used: with/without tin-filter (Sn), with/without ultra-high resolution (UHR), both individually and combined, resulting in four modes: Quantumplus (Standard), UHR Quantumplus (HighRes), QuantumSn (Standard-Tin) and UHR QuantumSn (HighRes-Tin). Reconstructions included virtual monoenergetic images (VMI) spanning 40-190 keV and polychromatic images, with/without iterative metal artifact reduction (MAR). Artifact volumes rendered in a 3D-printing software were quantified in milliliters (ml), and image quality was evaluated using a Likert score.

Results: Polychromatic reconstruction: Tin-filter reduced artifact volumes (298 (Standard-Tin) vs. 347 ml (Standard) and 310 (HighRes-Tin) vs. 360 ml (HighRes)). The smallest artifact volume was measured in HighRes MAR (150 ml). VMI reconstruction: The smallest artifact volume was measured in Standard 130 keV (150 ml) and HighRes 130 keV (164 ml) and in Standard-Tin 120 keV (169 ml) and HighRes-Tin 120 keV (172 ml). MAR further reduced the artifact volumes to 130 ml (Standard 150 keV MAR) and 140 ml (HighRes 160 keV MAR). Image quality was rated best for Standard 65 keV MAR, polychromatic HighRes MAR, Standard 100 keV MAR, polychromatic Standard-tin MAR, HighRes-tin 100 keV and polychromatic HighRes-tin.

Conclusion: Combining tin-filter, UHR and MAR in VMI or polychromatic images achieve the strongest artifact reduction.

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来源期刊
Skeletal Radiology
Skeletal Radiology 医学-核医学
CiteScore
4.40
自引率
9.50%
发文量
253
审稿时长
3-8 weeks
期刊介绍: Skeletal Radiology provides a forum for the dissemination of current knowledge and information dealing with disorders of the musculoskeletal system including the spine. While emphasizing the radiological aspects of the many varied skeletal abnormalities, the journal also adopts an interdisciplinary approach, reflecting the membership of the International Skeletal Society. Thus, the anatomical, pathological, physiological, clinical, metabolic and epidemiological aspects of the many entities affecting the skeleton receive appropriate consideration. This is the Journal of the International Skeletal Society and the Official Journal of the Society of Skeletal Radiology and the Australasian Musculoskelelal Imaging Group.
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