Cone-beam CT with a noncircular (sine-on-sphere) orbit: imaging performance of a clinical system for image-guided interventions.

IF 1.9 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Journal of Medical Imaging 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

Abstract

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 $\pm 10 \deg$ 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 $\sim 12 cm$ 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 $\sim 27 HU$ . Although both the radially averaged axial MTF ( $f_{x, y}$ ) and 45 deg oblique MTF ( $f_{x, y, z}$ ) were $\sim 20 %$ 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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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。

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。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Medical Imaging RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-

CiteScore

4.10

自引率

4.20%

发文量

期刊介绍： JMI covers fundamental and translational research, as well as applications, focused on medical imaging, which continue to yield physical and biomedical advancements in the early detection, diagnostics, and therapy of disease as well as in the understanding of normal. The scope of JMI includes: Imaging physics, Tomographic reconstruction algorithms (such as those in CT and MRI), Image processing and deep learning, Computer-aided diagnosis and quantitative image analysis, Visualization and modeling, Picture archiving and communications systems (PACS), Image perception and observer performance, Technology assessment, Ultrasonic imaging, Image-guided procedures, Digital pathology, Biomedical applications of biomedical imaging. JMI allows for the peer-reviewed communication and archiving of scientific developments, translational and clinical applications, reviews, and recommendations for the field.