带有非圆形(正弦球面)轨道的锥形束 CT:用于图像引导介入的临床系统的成像性能。

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-07-01 Epub Date: 2024-08-22 DOI:10.1117/1.JMI.11.4.043503
A Kyle Jones, Moiz Ahmad, Shaan M Raza, Stephen R Chen, Jeffrey H Siewerdsen
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引用次数: 0

摘要

目的:我们旨在比较锥束 CT(CBCT)成像系统的非圆形扫描方案(正弦-球面)与传统圆形轨道的成像性能:方法:使用可进行圆形和非圆形 CBCT 采集的双平面 C 臂系统(ARTIS Icono; Siemens Healthineers),后一种轨道(球面正弦,"正弦旋转")在半扫描轨道上执行倾斜幅度为 ± 10 度的正弦运动。测试模型用于鉴定图像均匀性、噪声、噪声功率谱(NPS)、空间分辨率[轴向和斜向的调制传递函数(MTF)]和锥形光束伪影。使用一个拟人头部模型,结合颅底神经外科的相关任务对研究结果进行解释:非圆形扫描方案在改进三维采样方面具有多项优势--在 NPS 中表现为围绕 f z 空间频率轴填充空锥体和减少锥束伪影。在 6.5 厘米的径向距离上,纵向极值的支撑区域从 16 厘米减少到 12 厘米。圆形和非圆形轨道显示出几乎相同的图像均匀性和量子噪声,显示出- 16.7%的杯突和 ∼ 27 HU 的总体噪声。虽然在默认的全重建视场(FOV)下,非圆形轨道的径向平均轴向 MTF ( f x , y ) 和 45 度斜向 MTF ( f x , y , z ) 比圆形轨道低 20 %,但在中等重建视场(较小的体素尺寸)下,空间分辨率没有差异。拟人化模型的感知图像质量差异加强了客观的定量研究结果,包括减少了颅底相关结构的光束硬化和锥形束伪影:在神经外科的临床系统上对圆形和非圆形 CBCT 眼眶的图像质量差异进行了定量评估。非圆形眼眶的主要性能优势在于改进了取样和消除了锥束伪影。
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Cone-beam CT with a noncircular (sine-on-sphere) orbit: imaging performance of a clinical system for image-guided interventions.

Purpose: We aim to compare the imaging performance of a cone-beam CT (CBCT) imaging system with noncircular scan protocols (sine-on-sphere) to a conventional circular orbit.

Approach: A biplane C-arm system (ARTIS Icono; Siemens Healthineers) capable of circular and noncircular CBCT acquisition was used, with the latter orbit (sine-on-sphere, "Sine Spin") executing a sinusoidal motion with ± 10    deg tilt amplitude over the half-scan orbit. A test phantom was used for the characterization of image uniformity, noise, noise-power spectrum (NPS), spatial resolution [modulation transfer function (MTF) in axial and oblique directions], and cone-beam artifacts. Findings were interpreted using an anthropomorphic head phantom with respect to pertinent tasks in skull base neurosurgery.

Results: The noncircular scan protocol exhibited several advantages associated with improved 3D sampling-evident in the NPS as filling of the null cone about the f z spatial frequency axis and reduction of cone-beam artifacts. The region of support at the longitudinal extrema was reduced from 16 to 12    cm at a radial distance of 6.5 cm. Circular and noncircular orbits exhibited nearly identical image uniformity and quantum noise, demonstrating cupping of - 16.7 % and overall noise of 27    HU . Although both the radially averaged axial MTF ( f x , y ) and 45 deg oblique MTF ( f x , y , z ) were 20 % lower for the noncircular orbit compared with the circular orbit at the default full reconstruction field of view (FOV), there was no difference in spatial resolution for the medium reconstruction FOV (smaller voxel size). Differences in the perceptual image quality for the anthropomorphic phantom reinforced the objective, quantitative findings, including reduced beam-hardening and cone-beam artifacts about structures of interest in the skull base.

Conclusions: Image quality differences between circular and noncircular CBCT orbits were quantitatively evaluated on a clinical system in the context of neurosurgery. The primary performance advantage for the noncircular orbit was the improved sampling and elimination of cone-beam artifacts.

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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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