Department of Otolaryngology-Head and Neck Surgery, Ear - Hearing, Amsterdam University Medical Centers, Vrije Universiteit Amsterdam, Amsterdam Public Health Research institute, Amsterdam, The Netherlands.
Department of Radiology and Nuclear Medicine, Amsterdam University Medical Center - Location VUmc, Amsterdam, The Netherlands.
J Int Adv Otol. 2020 Aug;16(2):222-226. doi: 10.5152/iao.2020.5883.
Multislice computed tomography (MSCT) is commonly used as a diagnostic tool for patients with a conductive hearing loss. Recent studies indicate that cone-beam computed tomography (CBCT) may be used as a low-radiation dose alternative for temporal bone imaging. This study compares image quality and radiation dose between CBCT and MSCT when assessing anatomical landmarks related to conductive hearing loss.
Five human cadaver heads (10 ears) were imaged on the NewTom 5G CBCT and the Discovery CT750 HD MSCT. Visibility of 16 anatomical landmarks of the middle and inner ear was assessed by two observers on a 4-point Likert scale. Furthermore, effective radiation dose was compared, and contrast-to-noise ratio and spatial resolution were measured with a phantom head.
Image quality of CBCT was assessed as superior to MSCT. Effective radiation dose of the high-resolution CBCT protocol was 30.5% of the clinical MSCT dose. High-resolution CBCT was reported as having a higher spatial resolution and superior contrast-to-noise perception in comparison with MSCT.
High-resolution CBCT was evaluated as superior to MSCT in the assessment of structures related to conductive hearing loss. Furthermore, CBCT imaging resulted in a considerably lower effective radiation dose.
多层螺旋计算机断层扫描（MSCT）常用于诊断传导性听力损失患者。最近的研究表明，锥形束计算机断层扫描（CBCT）可能作为一种低剂量辐射的颞骨成像替代方法。本研究比较了 CBCT 和 MSCT 在评估与传导性听力损失相关的解剖标志时的图像质量和辐射剂量。
对 5 具人体头颅（10 耳）分别进行 NewTom 5G CBCT 和 Discovery CT750 HD MSCT 扫描。2 名观察者采用 4 分制 Likert 量表评估中耳和内耳的 16 个解剖标志的可见度。此外，比较了有效辐射剂量，并使用头颅体模测量了对比噪声比和空间分辨率。
CBCT 的图像质量被评估为优于 MSCT。高分辨率 CBCT 方案的有效辐射剂量为临床 MSCT 剂量的 30.5%。与 MSCT 相比，高分辨率 CBCT 报告具有更高的空间分辨率和更好的对比噪声感知。
在评估与传导性听力损失相关的结构方面，高分辨率 CBCT 被评估为优于 MSCT。此外，CBCT 成像的有效辐射剂量显著降低。
