Puel Ulysse, Eliezer Michael, Boubaker Fatma, Villani Nicolas, Assabah Bouchra, Hossu Gabriela, Gondim Teixeira Pedro Augusto, Blum Alain, Parietti-Winkler Cécile, Gillet Romain
Guilloz Imaging Department, Central Hospital, University Hospital Center of Nancy, Nancy, France.
Université de Lorraine, INSERM, IADI, Nancy, France.
Can Assoc Radiol J. 2024 Aug;75(3):609-619. doi: 10.1177/08465371241234795. Epub 2024 Mar 3.
To compare image quality and radiation exposure between super- and ultra-high-resolution helical and super-high-resolution volumetric CT of the temporal bone. Six cadaveric temporal bone specimens were used to evaluate key temporal bone structures using the following CT reconstruction and acquisition modes: helical and single-volume acquisition modes in super-high resolution (0.25-mm slice thickness, 1024 matrix), and helical mode in ultra-high resolution (0.25-mm slice thickness, 2048 matrix). Two observers performed 5 previously described preoperative measurements, measured noise and signal-to-noise ratios for air, and noise for bone, and rated the visualization of 5 anatomical structures on a 4-point scale, for each reconstruction mode. Radiation dose exposure was recorded for each examination. There was no significant difference between any of the quantitative or qualitative measurements in any of the reconstruction and acquisition modes. There was a slight increase in noise and a decrease in signal-to-noise ratio in the air using the single-volume mode (115 ± 13.1 HU and 8.37 ± 0.91, respectively) compared to the helicoidal super-high-resolution (92.4 ± 11.8 HU and 10.8 ± 1.26, respectively) and helicoidal ultra-high-resolution (91.1 ± 10.7 HU and 10.9 ± 1.39, respectively) modes ( < .002). The volumic CT dose index was 50.9 mGy with helical acquisition and 29.8 mGy with single-volume acquisition mode ( < .0001). The single-volume super-high-resolution acquisition mode allows a reduction in radiation dose exposure without compromising image quality compared to helical scanning, but with a slightly lower signal-to-noise ratio in air with the single-volume mode, while there was no difference in image quality between the helical super- and ultra-high-resolution modes.
比较颞骨超高分辨率螺旋CT和超高分辨率容积CT的图像质量及辐射剂量。使用6个尸体颞骨标本，通过以下CT重建和采集模式评估颞骨关键结构：超高分辨率（层厚0.25mm，矩阵1024）的螺旋和单容积采集模式，以及超高分辨率（层厚0.25mm，矩阵2048）的螺旋模式。两名观察者对每种重建模式进行5项先前描述的术前测量，测量空气的噪声和信噪比以及骨的噪声，并以4分制对5个解剖结构的可视化进行评分。记录每次检查的辐射剂量暴露情况。在任何重建和采集模式下，任何定量或定性测量之间均无显著差异。与螺旋超高分辨率模式（分别为92.4±11.8HU和10.8±1.26）和螺旋超高分辨率模式（分别为91.1±10.7HU和10.9±1.39）相比，单容积模式下空气的噪声略有增加，信噪比降低（分别为115±13.1HU和8.37±0.91）（P<0.002）。螺旋采集时容积CT剂量指数为50.9mGy，单容积采集模式下为29.8mGy（P<（此处原文有误，推测是P<0.0001））。与螺旋扫描相比，单容积超高分辨率采集模式可降低辐射剂量暴露且不影响图像质量，但单容积模式下空气的信噪比略低，而螺旋超高分辨率和超高分辨率模式之间图像质量无差异。
