From the Departments of Radiology (J.C.B., K.R., J.I.L., F.E.D., N.M.W., J.E.T., J.G.F., C.H.M., S.L.)
From the Departments of Radiology (J.C.B., K.R., J.I.L., F.E.D., N.M.W., J.E.T., J.G.F., C.H.M., S.L.).
AJNR Am J Neuroradiol. 2022 Apr;43(4):579-584. doi: 10.3174/ajnr.A7452. Epub 2022 Mar 24.
Photon-counting detector CT is a new technology with a limiting spatial resolution of ≤150 μm. In vivo comparisons between photon-counting detector CT and conventional energy-integrating detector CT are needed to determine the clinical impact of photon counting-detector CT in temporal bone imaging.
Prospectively recruited patients underwent temporal bone CT examinations on an investigational photon-counting detector CT system after clinically indicated temporal bone energy-integrating detector CT. Photon-counting detector CT images were obtained at an average 31% lower dose compared with those obtained on the energy-integrating detector CT scanner. Reconstructed images were evaluated in axial, coronal, and Pöschl planes using the smallest available section thickness on each system (0.4 mm on energy-integrating detector CT; 0.2 mm on photon-counting detector CT). Two blinded neuroradiologists compared images side-by-side and scored them using a 5-point Likert scale. A post hoc reassignment of readers' scores was performed so that the scores reflected photon-counting detector CT performance relative to energy-integrating detector CT.
Thirteen patients were enrolled, resulting in 26 image sets (left and right sides). The average patient age was 63.6 [SD, 13.4] years; 7 were women. Images from the photon-counting detector CT scanner were significantly preferred by the readers in all reconstructed planes (< .001). Photon-counting detector CT was rated superior for the evaluation of all individual anatomic structures, with the oval window (4.79) and incudostapedial joint (4.75) receiving the highest scores on a Likert scale of 1-5.
Temporal bone CT images obtained on a photon-counting detector CT scanner were rated as having superior spatial resolution and better critical structure visualization than those obtained on a conventional energy-integrating detector scanner, even with a substantial dose reduction.
光子计数探测器 CT 是一种具有≤150μm 空间分辨率限制的新技术。需要在体内对光子计数探测器 CT 与传统能量积分探测器 CT 进行比较，以确定光子计数探测器 CT 在颞骨成像中的临床影响。
前瞻性招募的患者在临床指征下进行颞骨能量积分探测器 CT 后，在一项研究性光子计数探测器 CT 系统上进行颞骨 CT 检查。与能量积分探测器 CT 扫描仪相比，光子计数探测器 CT 图像的平均剂量降低了 31%。在每个系统上使用最小的可用截面厚度（能量积分探测器 CT 上为 0.4mm；光子计数探测器 CT 上为 0.2mm）在轴位、冠状位和 Pöschl 平面上重建图像。两位盲法神经放射科医生并排比较图像，并使用 5 分 Likert 量表对其进行评分。读者的评分进行了事后重新分配，以便评分反映光子计数探测器 CT 相对于能量积分探测器 CT 的性能。
共纳入 13 例患者，共 26 个图像组（左侧和右侧）。患者平均年龄为 63.6[标准差（SD），13.4]岁；7 例为女性。在所有重建平面上，光子计数探测器 CT 扫描仪的图像均明显优于读者（<0.001）。光子计数探测器 CT 在评估所有单个解剖结构方面的评分均较高，卵圆窗（4.79）和砧镫关节（4.75）的评分最高，Likert 量表评分为 1-5。
即使剂量显著降低，与传统的能量积分探测器扫描仪相比，光子计数探测器 CT 扫描仪获得的颞骨 CT 图像的空间分辨率更高，关键结构可视化效果更好。
