Mazziotti S, Arceri F, Vinci S, Salamone I, Racchiusa S, Pandolfo I
Dipartimento di Scienze Radiologiche, Università degli Studi di Messina, Policlinico G. Martino, Messina, Italy.
Radiol Med. 2006 Jun;111(4):607-17. doi: 10.1007/s11547-006-0055-y. Epub 2006 May 25.
The purpose of this study was to demonstrate the usefulness of coronal oblique multiplanar reconstruction computed tomography (MPR CT) reformation parallel to the basal turn of the cochlea in the evaluation of the retrotympanum and hypotympanum to complete the standard CT examination of the temporal bone obtained with axial and coronal images.
We studied 30 patients aged 18-79 years for a total of 60 normal petrous pyramids. All examinations were performed on a multislice CT (MSCT) scanner (Sensation 16, Siemens, Erlangen, Germany) with axial volumetric acquisition and completed with reformations of coronal and coronal-oblique images. MSCT scan parameters for axial acquisition were set as follows: 0.75-mm scan collimation, FOV 300 mm, 170 mAs. Axial images were reconstructed at 0.7-mm thickness and with a reconstruction increment of 0.5 mm using a high-resolution bone algorithm.
Coronal oblique MPR CT reformations provided additional information with respect to standard CT images in all cases. In particular, they enabled measurement of the craniocaudal and laterolateral diameters of the sinus tympani. In all cases, there was optimal visualisation of the ponticulus and subiculum. Analysis of the pyramidal eminence was improved thanks to its visualisation in profile. Moreover, we obtained an optimal representation of the hypotympanum, which was always exhaustively explored with only one reconstruction. Finally, in all cases, it was possible to identify the facial nerve canal and main vascular structures and to measure the distance between these and the sinus tympani, pyramidal eminence and hypotympanum. The coronal oblique CT reformation was of no advantage in the evaluation of the fossa of the oval window and the niche of the round window.
Coronal oblique MPR CT reformation should not be considered an alternative to the standard CT examination, but it can represent a valid integration to provide additional information on particularly crucial districts characterised by frequent involvement of inflammatory and/or expansile disease and because of their difficult endoscopic approach. Moreover, it can represent a meaningful aid to optimise surgical planning thanks to its different perspectives of observation.
本研究的目的是证明平行于耳蜗底转的冠状斜多平面重建计算机断层扫描（MPR CT）在评估鼓室后隐窝和下鼓室中的作用，以完善通过轴位和冠状位图像获得的颞骨标准CT检查。
我们研究了30例年龄在18至79岁之间的患者，共60个正常岩骨。所有检查均在多层CT（MSCT）扫描仪（Sensation 16，西门子，埃尔朗根，德国）上进行，采用轴位容积采集，并完成冠状位和冠状斜位图像的重建。轴位采集的MSCT扫描参数设置如下：扫描准直0.75毫米，视野300毫米，170毫安秒。使用高分辨率骨算法以0.7毫米的厚度和0.5毫米的重建增量重建轴位图像。
在所有病例中，冠状斜MPR CT重建提供了相对于标准CT图像的额外信息。特别是，它们能够测量鼓室窦的颅尾径和内外径。在所有病例中，小桥和下丘均能得到最佳可视化。由于锥体隆起的侧面可视化，对其分析得到了改善。此外，我们获得了下鼓室的最佳图像，仅通过一次重建就总能对其进行详尽的观察。最后，在所有病例中，都能够识别面神经管和主要血管结构，并测量它们与鼓室窦、锥体隆起和下鼓室之间的距离。冠状斜CT重建在评估椭圆窗凹和圆窗龛方面没有优势。
冠状斜MPR CT重建不应被视为标准CT检查的替代方法，但它可以作为一种有效的补充，为炎症性和/或扩张性疾病频繁累及且内镜检查困难的特别关键区域提供额外信息。此外，由于其不同的观察视角，它可以对优化手术规划提供有意义的帮助。
