Chadha Awalpreet Singh, Madhugiri Venkatesh S, Tejus M N, Kumar V R Roopesh
Department of Neurosurgery, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, 605006, India.
Surg Radiol Anat. 2015 Oct;37(8):901-12. doi: 10.1007/s00276-015-1434-7. Epub 2015 Jan 28.
The posterior fossa contains structures that are vital to life. In this study, we aimed at establishing normal linear dimensions and volume data of the posterior fossa in a homogeneous south Indian population. We also evaluated the influence of large tumors on these parameters. We evaluated the accuracy of different techniques of measuring these dimensions and compared them with literature.
Control and tumor MRIs were selected from an imaging database. Linear posterior fossa dimensions as well as volumes were measured using Image J and Fiji. The volume data were compared with similar data from literature. The effect of the presence of a tumor on posterior fossa volume was measured.
The posterior fossa volume was higher in men than in women, irrespective of whether the volume was estimated on axial, sagittal or coronal MR images. Despite the wide variation in the techniques used, there was no significant difference between the volumes reported in literature and the volumes calculated in the current series. The presence of large tumors did not affect linear dimensions or posterior fossa volumes. Among the techniques based on linear measurements that were assessed for concordance with manual segmentation, the technique using the formula for volume of an ellipsoid had the best agreement.
Posterior fossa volume is higher in men than in women, Posterior fossa dimensions were not affected by the presence of large tumors. Manual segmentation remains the most accurate method to measure posterior fossa volume.
后颅窝包含对生命至关重要的结构。在本研究中，我们旨在确定印度南部同质人群后颅窝的正常线性尺寸和体积数据。我们还评估了大型肿瘤对这些参数的影响。我们评估了测量这些尺寸的不同技术的准确性，并与文献进行了比较。
从影像数据库中选取对照和肿瘤的磁共振成像（MRI）。使用Image J和Fiji测量后颅窝的线性尺寸以及体积。将体积数据与文献中的类似数据进行比较。测量肿瘤的存在对后颅窝体积的影响。
无论在轴向、矢状或冠状MRI图像上估计体积，男性的后颅窝体积均高于女性。尽管所使用的技术差异很大，但文献报道的体积与本系列计算的体积之间没有显著差异。大型肿瘤的存在并未影响线性尺寸或后颅窝体积。在基于线性测量且评估与手动分割一致性的技术中，使用椭球体体积公式的技术一致性最佳。
男性的后颅窝体积高于女性，大型肿瘤的存在不影响后颅窝尺寸。手动分割仍然是测量后颅窝体积最准确的方法。
